Bureau of Mines

Report of Investigations 4838

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BITUMINOUS-COAL DEPOSITS IN THE VICINITY OF ESKA,

BY THEODORE R. JOLLEY, ALBERT L. TOENGES, AND LOUIS A. TURNBULL

1 I -- 'IT;tal T. W-.-. a!Tr nawrtmant# nof thoe IntArir- Februarv 19 52

u_. ury_ .rnr r---- - -r - , 
BITUMINOUS-COAL DEPOSITS IN THE VICINITY OF ESKA,

MATANUSKA VALLEY COAL FIELD, ALASKA

f

BY THEODORE R. JOLLEY, ALBERT L. TOENGES, AND LOUIS A. TURNBULL

* * * * * * * * Report of Investigations 4838

*

UNITED STATES DEPARTMENT OF THE INTERIOR

Oscar L. Chapman, Secretary

BUREAU OF MINES

J. J. Forbes, Director

Work on manuscript completed October 1951. The Bureau of Mines will welcome reprinting

of this paper, provided the following footnote acknowledgment is made: "Reprinted from

Bureau of Mines Report of Investigations 4838."

February 1952

_ ..
BITUMINOUS-COAL DEPOSITS IN THE VICINITY OF ESKA,

MATANUSKA VALLEY COAL FIELD, ALASKA

by

Theodore R. Jolley,L/ Albert L. Toenges,-/ and Louis A. Turnbull3/

CONTENTS

Page

Introduction.................................................... 1

Summary and conclusions ...................................... 1

Acknowledgments............................................... 2

Description of area.......................................... 3

Topography................................................ 3

Climate ......... ...... ...... ...... ................ 3

Mining rights.......................... ................. 4

Geology...................................................... 4

General description........ .............................. 4

Chickaloon formation ...... ................................. 4

Eska conglomerate .......................................... 6

Quaternary alluvial deposits ............................... 6

Investigation of coal deposits in the vicinity of Alaska Railroad Eska 2 mine .............................................. 6

Preliminary examination ................................... 6

Trail building............................................. 7

Diamond drilling ...................................... t 7

Strata penetrated in drilling .............................. 8

Hole 13-16 ........ .................................... 9

Hole 14-16 ............................................ 9

Hole 15-16............................................ 9

Description of Alaska Railroad Eska 2 mine ................. 10

Description of Evan Jones mine ............................. 11

Interpretation of drilling results and estimate of coal

reserves.. ..... .. ....... ... ...... ..... ....... 14

Description of coal beds ....... ................................. 15

No. 5 bed ............................................. ... .. 15

No. 6 bed .................................. ............... 16

Chapin bed ......... ................................. ...... 16

Emery or No. 8 bed ....... ............................... 17

Eska bed....................................... .. .......... 17

Shaw bed ....................... ............................ 18

Martin bed .......... . . .......... . . . ........ .. ........... 18

1/ Mining engineer, Coal Branch, Fuels and Explosives Division,

Bureau of Mines, Pittsburgh, Pa.

2/ Principal coal mining engineer, Fuels and Explosives Division,

Bureau of Mines, Pittsburgh, Pa.

3J Senior mining engineer, Coal Branch, Fuels and Explosives Division, Bureau of Mines, Pittsburgh, Pa.

Report of Investigations 4838
I

CONTENTS (Cont.)

Page

Investigation of coal deposits in area east of Eska Creek ....... 19

Preliminary examination ................................... . 19

Road building..................................................... 19

Diamond drilling...... ........................................... 19

Strata penetrated in drilling .............. .................... 21

Description of Alaska Engineering Commission East mine..... 21

Description of Knob Creek Coal Co. entries................. 22

Interpretation of drilling results and estimated measured

reserves of coal in the area east of Eska Creek ............... 22

Maitland bed ................................................. 22

David bed ................................................. 23

Emery bed ................ ..................... ................ 23

Eska bed............................................. ........ 24

Shaw bed ................................... ............... 24

Martin bed ..... ..................................... 25

Bed A ....... ............................................. 25

Bed B ..................................................... 25

Bed C ...................................................... 26

Bed D..... ............................... 26

Little Eska group .......................................... 27

Coal preparation of Matanuska coals ... ............................. 27

Appendix........................................................ 28

Logs of drill holes ........................................... 29

TABLES

1. Coal reserves in vicinity of Eska 2 mine, January 1, 1946.. 18

2. Coal reserves in area east of Eska Creek, January 1, 1949.. 27

3. Analyses of coal cores, in vicinity of Eska 2 mine, Matanuska Valley field, Eska, Alaska ......................... 83

4. Analyses of coal cores, East Eska Creek area, Matanuska

Valley field, Eska, Alaska ............................... 84

ILLUSTRATIONS

Follows

ig. page

1. Anchorage area, showing lower Matanuska coal field..... 2

2. Mines in lower Matanuska Valley coal field............. 2

3. Matanuska River, with many braided channels ............ 2

4. Matanuska glacier at head of Matanuska Valley.......... 2

5. Wishbone Hill, with vertical escarpments ................ 2

6. Alluvial-covered foreground, looking west from Eska,

Alaska .................................................... 6

7. Portal of Alaska Railroad Eska 2 mine entry ............ 6

8. Geologic map of area of Alaska Railroad Eska mine ..... 6

9. Cross sections through drill holes 13-16 and 15-16 .... 8

10. Plan of Eska mine .......................................... 10

11. Development plan in north limb of Eska mine ............ 10

12. Plan of Evan Jones Coal Co. mine, Jonesville, Alaska... 10

13. Portion of the Evan Jones surface plant .. ................ 12

14. Dormitory at Eska, Alaska .............................. 12

15. Tipple and preparation plant, Eska, Alaska ............. 12

16. Diamond drill set-up at hole 2-15-EA ......... .......... 20

17. Bulldozed road east of Eska Creek .... .................. 20

18. Area investigated east of Eska Creek, Alaska ........... 20

19. Eska bed in an area east of Eska Creek ................. 22

20. Shaw bed in an area east of Eska Creek ................. 22

21. Martin bed in an area east of Eska Creek ............... 22

4564 - ii -
INTRODUCTION

In recent years, the production of coal in Alaska has been less than the

requirements, especially in the highly populated Anchorage area. As bituminous

coal stores well and has a higher heating vluc than subbituminous coal and

lignite, it is in great demand. The Matanuska Valley coal field, which is

approximately 60 miles northeast of Anchorage, is the only source of bituminous

coal in the rail belt. The minable reserves of bituminous coaolin the

Matanuska coal field are not known, and investigations to dotermine these

reserves were begun in 1943. At that time, three mines were in operation in

this coal field: Tho Evan Jones mine at Jonesville, the Eska 2 mine of the

Alaska Railroad at Eska, aand. the Buffalo mine at Moose Crook. Reserves at

the Buffalo mine were developed and reported by G. A. Apelol.S/ The Buffalo

mine discontinued operations in 1945. The known reserves at the Eska 2 mine

wore limited and development of now reserves was of primary importance. Investigations by diamond drilling to develop reserves, in tho north limb of the

synclino of this mine were begun in 1945, and the results of this investigation

are described in this report. The Eksa 2 mine was abandoned on Juno 30,. 1946;

since that date, the only producing mine in the Matanuska field is the Evan

Jones mine. The minable reserves of coal that can be economically recovered

frcm this opening are limited. As thiis s the only bituminous-coal mine in

Alaska, dovolopBnnt of ' new modern mine in this field is important to the

future development of the Territory.

A geological reportS on an area east of Eska Creek ,,nd adjacent to Eska 1

mine indicated a potential reserve of coal that could be developed should

minable reserves be provcd by diamond drilling. Part of this area had been

investigated by churn drilling and reported by Tuck.6/ This report shows

structural conditions favorable for the installation of mechanical mining

equipment. The area also is accessible to the surface plant and washery of

the Eska 2 mine. An investigation of the orc, was bogun in 1947 and the results

are given in this report.

SUMMARY AND CONCLUSIONS

The estimated recoverable reserves in the area in the'vicinity of Eska 2

mine are 699,300 tons in the Chapin and Emery beds of the Maitland group.

Those recoverable reserves are in the area botween the Eska fault zone and,

Jonesville fault and extend down dip from the outcrops. No reserves were

developed by the Eska 2 entry or by drill hole 14-16 in the Eska fault zone.

The small quantity of reserves in the vicinity of the ;Eka 2 mine is insufficien

to justify development of' a newx, todemrn mine in this arca..

4/ Apell, G. A., Moose Creek District of Matanuska Coal Fields, Alaska: Bureau

of Minos Sept. of Investigations 5784, 1944, 36 pp.

2/ Barnes, . F., and Byers, F. M., Jr., Geology and Coal Resources of the

Eastern Part of the Lower Matanuska Valley Coal Field: Geol. Survey,

Mim. Ropt., 1945, 21 pp.

/ Tuck, Ralph, The Eska Creek Coal Deposits, Matanuska Valley, Alaska: Geol.

Survey Bull. 880-D, 1937, 214 pp.

4564 - 1 -
The estimated recoverable roserves in the area east of Eka Creek are

974,500 tons in the Eska, Shaw, and Martin beds of the ska group. Most of

these resorves occur in the south limb of the synclino. It will be necessary

to practice subjacent mining methods to recover these resorves in the Eka

group. The ESka bed developed by the dinmond drilling in this area comprises

coal and flw thin partings. The Shaw and Martin beds comprise two benches of

coal separated by partings, and the product from full-bod mining will require

thorough preparation.

The estimated recoverable reserves oast of Eska Creek might be increased

by diamond drilling in tho north limb of tho syncline north of the area

investigated. Down faulting east of the Alaska El ,gineering Commission mine

indicates that this area might be underlain by coal beds. Ihe dip of the

Eaery bed in this mine is reported to be 150 south on the east side of the

northe.st fault, indicating that the beds in the north limb of the syncline

may h avo the same dip. Drill holes 3-15-EA and 7-10-EA on the north side of

the xroa penetrated the fl3ka group of coal beds.

Preparation studies of coals from the Bvan Jones and Eska 2 mines show

that coal containing 18 percent ash can be recovered from the coal beds in

this field. However, the high inherent ash in all coal from beds in the

k.atanuska field, except some beds in the Moose Creek area, necessitates

mechanical cleaning to secure a satisfactory product.

The investigation indicates that the anea of recoverable reserves east

of Eska Creek is separated by faults into snall areas. Mining those small

areas, which are in several beds, is not favorable for low-cost mining. The

structural conditions in and surrounding tdie coal beos and tho extent of the

measured reserves in the aroa east of Ita Oreck dIo not warrant dovelomelnt

of a modern mechanized mine at present.

ACKNOWLEDGM ,3S

Before July 194_5, field investigations wore under the direction of

Pobort S. Sanford / and James H, HulbcrtL/ of the Mining Branch, Fron July

1945 to January 1950, field investigations of coal in Alaska wore under the

direction of Albert L. Toengos, Louis A. Turbull, and Theodoro R. Jolley,

Bituminous Coal-Mining Section, Pittsburgh, Pa, Cool anncysos were under the

direction of H. M. Cooper and R. F. Abornethy. Preparation of thin sections

and samples of coal for analyses were supervised by B. C. Parks, assisted by

H. J. O'Donnell and H. L. Smith. Illustrations wore prepared by the Graphic

Section under tho supervision of Louis F. Perry, supervising engineer. Geological field work was conducted by Farroll F. Barnes and Thomas G. Payne,

geologists of the Alaska Branch of the Federal Geological Survey,

Z/ Sanford, Robert S., formor acting chief, Alasksa Division, Mining Branch,

Buroau of Mines, Juncau, Alaska.

/ Hulbert, James H., former mining engineer, Alaska Iivision, Mining Branch

Bureau of Mines, JunQau, Alaska.

4564 - 2 -
Figure 1. - Anchorage area, showing lower Matanuska coal field.

- - - m - - m
confact

rrnsfion

FM1

Figure 2. - Mines in lower Matanuska Valley coal field.
/

| IM

, " II'll 11 -

Figure 3. - Matanuska River, with many braided channels.

Figure 4. - Matanuska glacier at head of Matanuska Valley.

Figure 5. - Wishbone Hill, with vertical escarpments.
The cooperation of B. D. Stewart, Territorial Cormissioner of Mines;

L. G. Anderson, Bureau of Mines; Harry J. Hill, general manageor and Tom

McFarlano, superintendent, Evan Jones mine; Col. 0. F. Ohlson nd. Col. J. P.

Johnson, general managers, Alaska Railroad; and Harvey Hibcr and H. Toralinson,

superintendents of tho Eskar 2 mine, is gratoeflly acknowledged. Camp faciliti

furnishod by the Evan Jones nlino and the Alaska Railroad aro appreciated.

DS;CRIPTION OF AREA

The Matanuska Valley coal field is in south central Alaska, 60 miles

northeast of Anchorage .and 16 nilos northlcst of Pal;lor, Alaska. (SQO figs.

1 and 2.) Thlo Esk 2 Lnino area is west of Eska, Alaska, tilo te:cinus of the

Matanusla braonch line of the Alaska Railroad. An ccccss rodl. extending from

Sutton to Joncsvillo was constructed by the Even Jones Coal Co. in 1945. In

1946 an access road. was constructed. from Jasonsville to Eska, aild 1947 this roa

was extended. to tho Eska Crock aroa east of ESka. The Alaska Rioad Cormnission

constructecl an all-we.ather road from Sutton on thu Glen Highway to Eska and

Jonesville in 1949.

The Matanuska coal field is in the foothills of the Talkootrna RaEng on th

north sido of Matanuska Valley. The M atnuska River, with ;Lany braided

channcls (fig. 3), is south of the aroes investigated.. Etob Crook is a tributary of Eska Crook, which is a tributary of the Matanuska River. Both creek

are wide, with low banks on the south side of -the area, but become canyons

with steep to vertical banks toward their source. Glaciation has altered many

topographic features and outcrops are covered by the glacial deposits. The

Matanuska glacier (fig. 4) has receded. Mnd is now 60 miles upstream from Palme

Topography

The topography of the Matanuska Valley coal field is glaciated and

comprises knobs, kettles, eskers, and marginal moraines. Drainag of the area

is poor, and there are swamps enclosed by low ridges. Eska Creek is in thte

center of the area investigated, and iKnob Creek bounds the area on the east.

There is a general southeast slope rising from 600 feet in the southeast to

900 feet in the southwest, to 1,500 feet in the northeast, and 2,300 feet in

the northwest. Wishbone Hill is west of Eska Creek and. foir.s a ridge separatin

the Eska Creek area from Moose Creek on the northwest. (See fig. 5.) Knob

Hill, northeast of this area, is another prom•inent feature.

Climate

The climate is mild; summer high temperatures range from 70 to 80° and an

average umean winter low is -20o F. £ Winter temperatures have dropped to -40o.

The average annual rainfall is 25 to 30 inches, However, torrential rains

occur, and these cause flash floods. The average accumulated snowfall is 3 fe

with a maximum accumulation of 10 feet. The most suitable period for field

work is May 15 to October 15.

45664 -3-
Mining Rights

The coal and mining rights are owned by the Government and .are leased in

accordauce to the Coal Leasing Act.2,/ The aroeas investigated are. in coalleasing unit 7 and an adjacent prospector's leasing unit in T. 19 N., -R. 3 E.

Leasing unit 7 comprises the following: El/2 SE1/4 and NWi/4 SE1/4 sec. 8,

S1/2 sec. 9, SWl/4 sec. 10, NW1/4 sec. 1), and Nl/2, SW1/4, and N1/2 sEl/4

sec. 16. Tne prospoctor's unit compiisos the following E1/2 sec. 10, W1/2

sec. 11, Iw 1/4 sec. 14, and NLM/4 soc. 15. The Alaska Railroad mines are

in leasing unit 7. This railroad is operated by the United States Department

of the Interior end pays no royalty on coal mined. The usual royalty collected

by the Govermient on coal-mining loasos is 10 conts per ton, and on prospecting

permits, 25 cents per ton. However, coal-royalty rates are determined on

leasing units by competitive bidding, and leases are awarded to the highest

bidder, Coal-mining leases are for an indefinito term, renewable at intervals

of about 2 years, and usually are automatically renewed if coal mining is

continued in a workmanlike and diligent manner. Coal-prospecting permits grant

exclusive rights to prospect on tho described land for definitq terms of about

2 or 4 years ancd may be renewed if prospecting is conscientious and diligent.

Polmits and leases are granted only to citizens of the United States.

GEOLOGY

General Lascription

Tho geology of the Matanuska coal field was studied first by Martin and

Katz ,l/ who described the Tertiary rocks as comprising two nonmarine sodimontary formations, namely in ascending order: (1) The Chickaloon formation

and (2) the BEka conClmor.ate. Cretaceous roclks, which are boncath the

Chickaloon formation, may be present east of Knob Corek but wore not within the

areas investigated. Quatoenary glacial and alluvial deposits cover the entire

field except on the steepeot slopes ,ad highest ridges. The geology has been

described also by Tuck, 1 J/ Barnes,2/ and Paynoel of the Federal Geological

Survey, and aL brief summary of the rosults of their studies is incorporated in

this report.

Chickaloon Formation

The Chickalodn formation is about 5,000 feet thick and comprises claystono,

siltstono, sandstone, arid groups of coal beds. Most of the coal beds are in

the upper 1,500 feet of the formation, except for two thin coal zones that are

thought to be in the lower 500 feet of this formation. The Chickaloon formation

D/ Dept. of Interior, Regulations Governing Coal-L. d Lass in the Territory

of Alaska: May 1916, 86 pp,

1/ Martin, C. G., and Katz, F. J., Geology and Coal Fields of -the Lower

Matanuska Valley, Alaska: Geol. Survey Bull. 500, 1912, 98 pp.

i/ Tuck, Ralph, Work cited, footnote 6.

2/ Barnes, F. F., and Byors, F, M., Jr,, Work cited, footnote 5.

/ Payno, T. G., and Hopkins, D. .M, Geology and Coal Resources of the

Wostern Part of the Lower Matanuska Valley Coal Field, Alaska: Cool.

Survey Mim. Rept. 105117, 1944, 22 pp.

1

4564 - 4 -
is exposed on the eastern and northern sides of Wishbone Hill and along Eska

Creek. The coal in the upper part of the formation occurs in groups of three

or more beds generally close together. However, these groups generally are

separated by thick, intervals of claystone (shale). Ironstone, which comprises

layers and nodular concretions ranging from 1 inch to 3 feet in thickness

and diameter, is -common throughout the formation and generally is most abundant

in the zone beneath the lower coal beds. Below the coal-bearing part of the

formation are numerous, thin-bedded, dark claystones, silty claystones, and

fine sandstones which contain thin streaks of coal and carbonaceous shale.

The upper part of the formation contains three distinctive sandstone layers,

known locally as the Emery, Eska, and Little Eska sandstones. The Emery and

Eska sandstones weather to a buff color andare above the coal beds of the

same name. The Little Eska sandstones are above the lower or Little Eska coal

beds and contain crystalline minerals derived from the erosion of granite.

These sandstone members usually are recognized in the core samples.

The thrust of the mountain uplift north and south of the area of Chickaloon

formation has caused faulting and folding and formed the Wishbone Hill syncline.

The folding is greatest in the weakest and least competent beds, and the

attitude of the weaker beds may be different than of the stronger beds. This

difference in attitude also is apt to occur between the Chickaloon formation

and the overlying Eska conglomerate because there is a great difference in the

strength of the beds in these two formations.

The groups of coal beds were named by Tuck,./ Barnes,l/ and Payne1/ and

the groups in descending order follow:

Jonesville

Bed 4

Bed 3

Bed 2

Bed 1

Premier Maitland

Bed 5 - bed 0

Bed 6 - bed 00

Bed 7 Chapin bed

Bed 7A .Maitland bed

Bed 7B David bed

Emery bed or Bed 8

Bed 9'

Eska

Eska bed

Shaw bed (Bed 10)

Martin bed

Little Eska

Each coal -od ponctrated in theo rilling is described in the discussionof diamond drilling.

1/ Tuck, Ralph, Work cited, iootnote 6.

5/ Barnos, F. F., and Byors, F. M., Jr., Work cited, footnote 5.

1/ Payno, T. G., and Hopkins, D. M., Work citod, footnote 15.

4564 - 5 -
Eska oCnglommerate :

The Eska conglomerate, which is about 1,700 feet thick, is composed

predominantly of pebbles, cobblestones, and boulders cemented by a sandy matrix

and includes numerous sandstone beds ranging from a few inches to 40 teeat '

thick. The lower 1,100 feet comprise mostly volcanic and metamorphic rooks'.'

The upper 600 feet is mostly granite and diorite rocks.-

Quaternary Alluvial Deposits "

The recent alluvial deposits range frbm a few inches to 50 feet or ii re '

thick. Most of the surface, except the steepest slopes, are covered wi.thi-ii.,

silt, gravel, and boulders. Slide rock, comprised mostly of fraients of ' '

conglomerate, -including blocks as largo as 50 feet in diameter, have slid- from

Wishbone Hill and covered slopes adjacent to escargents west of Eska. The

mantle of alluvium obscures most of the outcrops and'must be penetratbd. to::

determine the rocks beneath. (See fig. '6) Occasionally fragaents and masses.

of coal are found in the alluvium,

INVTIGATION OF COAL DEPOSITS IN MIE VICINITY

OF ALASKA RAIROAD USKA' 2 MINE

Preliminary Examination ' '

A reconnaissance of the area was made in the spring of 1945 by Bureau of

Minos engLnecrs and Foderal Geological Survoy geologists. The geology of the

area was mapped and reported by BarneslZ/ in 1944, and it is stated in this

report that the largest coal reserve of tho jtka 2 mine is in the north limb

of the synlino between the Eska fault zone and the Jonesville fault. (Soe fig.

8.) The strata in the north limb of this block indicate that all of the coal

beds from the Jonosville group to the Eska group are present. The strike

entries in the Eska mine aro in the hska group of bods, which comprise the

Eska, Shaw, and Martin. These lower beds were developed., but the upper beds

have not boon mined in the 2ska mine. Devolopment in the 2Ska bed in the

north limb of the syncline was stopped because of the increase in the inherent

ash in the coal. The Shaw bed contains two benches of coal separated by a

thick parting of coaly claystone and bony coal. Howver, the entire section

of the bed was extracted, and a yield of approximately 50 percent clean coal

was obtained. As dovoloe ont in the Martin bed advancod to the west, the.

inherent ash in the coal incroasod and mining was stopped. Rofuse and

extraneous rock in the coal loaded in the mine had increased to the proportion

of 60 percent of the run-of-mine coal in 1945. This amount of r&fuse was a

burden on the preparation plant and rosultod in en excessive cost of clean coal.

Tb determine the extent, thickness, and physical end chemical characteristics

of the coal beds overlying the &Eka group, diamond drilling was undertaken in

1945 in an area of the Eska 2 mine, where potential reserves wore indicated by

the geological reconnaissnceo. The beds overlying the E3ka group include all

beds mined at the Evan Jones mine in the Premier and Jonesville groups. These

upper beds also were mined in the Alaska Enginooring Commission mine east of ska.

/ Barnes, .F., and Byers, F. M., Jr, Work cited, footnotot 5.

4564 -6-
a

/ 

"I. IA- I I

., h.I'. 

, -* Iis

"'W" - TI;L~~

1tf, 9 · . _'

Figure 6. - Alluvial-covered foreground, looking west

from Eska, Alaska.

-

Figure 7. - Portal of Alaska Railroad Eska 2 mine entry.
,. s / I

-Cct- .r' vr & a a 6& of a. r/e P

-Out'OA ~nI'? !Y &u a,, 0)j eIqie'r f" orii//y- 3

Figure 8. - Geologic map of area of Alaska Railroad Eska mine. (Geology and base map by Geological Survey).
Trail Building

Trails were constructed west from Eska to drill sites 15-16; 14-16, and

15-16 (fig. 8) with a bulldozer. The trails wcre 6 feet wide and were graded

and leveled where the surfaco was rough nnd uneven. About 1-1/2 miles of

trail were built at c cost of $1,000.00 per mil6 across steep terrain comprising soil and gravel.

The drilling equipment was transported to the drill holes on sleds drawn

by a crawler-type tractor.

Diamond Drilling

Diamond drilling was done under contract between tho Bureau of Minos and

Lynch Bros. - diamond-drill contractors of Seattle, Wash. As a guido for

estimating the cost of drilling under similar conditions, unit contract prices

are given:

Description Unit price

1. Driving though overburden and installing standpipo

of' ifficiont izd to 'petmiicortiriuod cor

'tbring 'with 'BX-size -bit

rom iO to f30fodot,...........r foot $7.50

Fronm 50 fesetto 'driook,.. ; .............. . do. 8,40

2. Diramor. drill co )i -Edririg WEh '*.. BI.M . .... do 7 90

3. Diamonldl drill 'core bdo'rin wi'th 'AX bit, .;...... do . 7.40

4. Additidorl dirmdndt-di''ll co'rd ' bor;ing as ordered

by Government beyond guarsantoud minimum of

4',)o00 o'rt bup tod -a M'ciimzui i 'f 10,000 feet

inc'lu'ding mintriau:'

- With BX *bit' .... ....... ,. ' ' .'t.'. ... ·. ....... do 7.65 With AX bit..i............, ............ do. 7.1 5

5. Roaming AX-size holes to BK-size holes for

installing AX-s ize clsing................ ,., do. 2.50

6. Casing BX-sizo holes.......................... do. 1.50

7. Comonting, waiting for cement to set orid drilling

through Ocement .......... ,.., , ............... do. 2 .50

8. Extra time for surveying snd other nonproductive

work as ordered by Govwornmont....,...........per hour 7.00

The thickness, physical charatcristics, and extent of the Upper Chickaloon

cosal beds and underlyingand overlying strata were dotoneined by diaond

drilling, which yielded 1-5/8- and 1-1/8-inch coal cores. Chemical and potrographic analyses wore mado of these coros and the dip (an'd strike) of the beds

were computed from the drilling data.

Hole locations are shown in figure 8, aond each hole is designated by a

serial and section nwubor separated by a dash. The serial number designates

the order of drilling and the section number in which the hole was drilled; fcr

oxample, 13-16 indicates the l3th hole drilled and is located in section 16.

4 64 -7-
Detailed logs of drill holes and chemical analyses of coal cores are

given in the appendix. Locations of the holes are summarized as follows:

Hole 13-16 1,400 feot W. and 1,040 foot N. of center of sec. 16,

T. 19 N., R. 3 E.

Hole 14-16 1,650 feet W. and 295 feet N. of center of sec. 16,

T. 19 N., R. 3 E.

Hole 15-16 2,000 feet W. rnd 130 feet N. of center of sec. 16,

T. 19 N., R. 3 E.

Holes 1 to 12 were drilled by the Mining Branch of the Bureau of Mines

in the Moose Creek area. The results for holes 1 to 8 wore published by the

Bureau of Mines .,18/ 4nd the results for holes 1 to 11 wore published by the

Goological Survey.l / Hole 12 was abandoned at 149 foot alnd no core was

recovrecd.

Drilling of holes 13 to 15 was begun Juno 1, 1945, and completed

October 22, 1945.

Progress of drilling is as follows:

Holes Holos drillc drilld.. d. ............... *..***,**.**.,**...***.*.... 60........... ...... .. # . .. .... . , 5

Fboetag ,ca c...c..c.. * t cte....... a ec....... '... 2,2081

Overburden (standpipo) .. .. ,*,*c*c,... *.a.....*feot 85

1-5/8-inch core drilling.. . ..... ,. *. *,,... ... do. 987

1-1/8-inch core drilling.. ....... .,4c..9......::.. . .... * ., . do. 19009

Drilling shifts ....... ... ....... .. . ,. .... ..... 164

Average feet per drilling shift. ....... ,....,........ 1......,,. 12.7

Total shifts, including oves, repairs, and other delays (1 drill, two

8-hour shifts per day 6 days per week)o.,........................... 214

Foot per shift (total shifts)............ .,.................. . 9.7

Average cost per foot a... ..... ........... , ......... $8.44

Sttata Penetrated in Drilling

Beds of the 'Eska conglomerate o d Chickaloon formations in the area are

folded into a southwest-pluglirig syncline. This synclino, which has been

named Wishbone Hill, is segregated into displaced sogecnts by sovoral major

transverse faults and mnry minor faults that strike in a northeast direction.

The aroa investigated by drill holes 13-16, 14-16, anld 15-16 is between the

Eska fault zone and the Jonesville, fault. (See fig. 8.) Tho average dip of

strata penetrated by the drill holes is 300 SE. (See fig. 9.) The inclination

of the drill holes was about 600 from the horizontal and the strike of drill

hole 1-3.16 was N. 200 W., and the strike of drill holes 14-16 end 15-16 was,

N, 100°W. - lhe relations of the stratigraphic units are essentially typical

throughout tho area, end the coal series of the Chickaloon formation have been

corrolated laterally and vertically. Bed nrmos are shown in the logs of drill

holes. All beds wore penetrated ossentially normal to the bedding and bed

thickness' shown in logs is true thickness.

184/ Apoll, G. A Work d. footnote 41 citude 

J9j Payno, T. G., and Hopkins, D. M., Work cited, footnote 15.

4564 - 8 -
I/W

/300

7100

9oo

% /300

I.

Drl/ho/e

i/. /370'

1300

Figure 9. - Cross sections through drill holes 13-16 and 15-16 (looking west).

m 0
1

The strata associated with the Chickaloon groups of coal beds are coaly

claystone, silty claystone, claystono, silstono, and. sands tone. The Chickloeon

formation is characterized by 4 groups of coal beds or at least 18 intervals

during which coal was foxmod. The lower 0ocal beds were penetrated in holes

13-16 and 15-16.

-The coal beds penetrated in the drilling in descending order are:

Jonesville group

No. 5

No. 6

Maitland group

Chapin

Maitl and

David

tmry (No. 8)

No. 9

Eska group

Kska

Shaw

Martin

Hole 13-16

The field classification of tho core recovered from the various coal beds

indicated that No. 5, Lower Chapin, anory (No. 8), Shaw, L-nd Martin beds are cf

mionable thickness. A cross section of drill hole 15-16 is shown in figure 9.

Hole 14-16

No minable coal beds wore penetrated in hole 14-16. ihe first strata

penetratedo wore the &ka conglomeratu formation and. transition bods between

the Eska conglomerate and. tlh Chickaloon formation. Prc-dominjnt claystone in

the bottom of the hole indicates that tie upper part of tho Chickaloon formation

was penetrated. The absence of consistent coal beds zand. enetration of gouge

end shear zones from 176 to 216 feet, from 242 to 245 feot, and from 588 feet

6 inches to 392 feet indicate faulting and lack of confolrity to normal sequenc

LTose shear zones locate the odge of the Eska fault zone (fig. 8-), which was

penetrated and passed through for a short distance. The hole did.not penetrat

deep onough to yield cores of coal beds to clarify correlation.

Hole 15-16

Hole 15-16 started in the Esk. conglomerate and penetrated the intraformation transition beds into the ChickaloQn tbrmation. The bodding was

abnormal in the upper part of the hole, with gouge zones from 179 to 180 feet,

244 to 24Q feet, and shoaring and cra,.shing at 211 foot 6 inches from 236 feot

6 inches to 243 feet, and at 422 feet. Assuming normal structure below 550 fee

and an averagq normal dip of 30°, the coal beds between 580 feet 9 inches and

623 feet 1 inch have been correlated as tho Maitland group; and the coal bed

4564 - 9 -
from 696 feet 9 inches to 708 foot has boon correlated as the inery or No. 8

bed. The beds probably minable are the Chapin of the Maitland group from 586

foot 9 inches to 592 foot 9 inches and the Enery or No. 8 bed from 696 feet

9 inches to 708 feet.

The abnormal condition in the upper portion of tho hole may be duo to

orosional undersapping of the softer Chickaloon beds beneath the Eska conglomerate and subsequent sliding of tilo Eska conglomerate in large masses.

Those large, massive blocks of Eska conglomerate at the surface of the ground

near drill hole 15-16 are partly detached from other largo masses, but all

of the blocks are on the some dip and strike.

Dsscription of Alaska Railroad Eska 2 Mino

ESka 2 mSne was opened with a rook entry (fig. 7), which was driven in a

northwest direction across the syncline. This entry penetrates the Martin,

Shaw, Bka, and BEory beds, which dip about 300 north and strike east-west

in the south limb, and then passes through the wide Eska fault zone into the

north limb, where the Eska, Shaw, annd Martin beds dip about 340 south and

strike east-west. A plan of the mine is shown in figure 10.

In tho north limb, strike entries (gangways) are driven in the ESka and

Shaw beds and those entries are intake airways. The return airway (counter)

is driven in the coal 50 foot up the rise from the strike entry and parallel

to it.

Three panel rooms on 50-foot centers are turned off the strike entry at

about 600-foot intervals and are driven up the rise from the strike entry to

the outcrop. The center room of the panel is the permanent manway and is

equipped with a hoist to transport timber and supplies to the working places.

The inby and outby rooms of the three panel rooms are equipped with permanent

chutes. At 200 feet up the rise from the strike entry, wing or transverse

rooms equipped with chutes are turned both to the right and left off the

respective outside rooms at an angle of 45 ° , (See fig. 11.) Rooms on 50-foot

centers are turned at 45° up the rise from the transverse rooms and driven

to the outcrop. Ten rooms comprise a panel, and pillars are extracted on

retreat from the panel.

The barrier pillars between the counter and the transverse rooms range

from 150 to 450 feet in width end are not extracted. The first panel was

developed from two panel rooms; however, later development was from three

panel rooms. (See fig. 11.)

The south limb of the mine was developed from two inside slopes, one in

the SDka bed called the Eska slope and one in the Martin bed called the Martin

slope. The coal beds in the south limb occur along the axis of the synclinal

trough and strike entries in the Eska, Shaw, and Martin beds were driven to

the right and left from the slope. Tho entries driven to the west torminated

at the Eska fault zone. The strike of the coal bods changes as the develoment

advances and in plan is shaped in,the forn of a horseshoe or trough, Rock

entries connect the three beds at the bottom of the Martin slope. The

stratigraphical interval between the coal beds is about 50 feet. Chute-andpillar and subjacent mining wore practiced. The beds were developed in the

4564 - 10 -
89

I7 /6

ds ikrbvyrf

, . . ..

/ca/e, fief

I

--- --------

Figure 10. - Plan of Eska mine.
0NZ

998'

rx

fur / 62?0'

fe

'Inle

ornery bedprosbaj bet'een between ffteze t/iei rno two f/ne. //,b

*f/t/andbedpro.b/y betfee&n cmee two libe.1

7- L 7ndy on f~o arface

-~/ Theoref/cs/ ex/enw/on of fuft

- - / _encountered in Isw bed entry

300 /SO A ~e0

/cd{. fteef

- --

Figure 11. - Development plan in north limb of Eska mine.
L8 1 _ _27 6__ _

/w /7 /77 /i

1n Ji -

600 30 0 600 /!0 0

c e/ et ... '

Figur Pla ---- -- - .I - - -- - --

Figure 12. - Plan of Evan Jones Coal Co. mine, Jonesville, Alaska.
order of the top or BIka..bed first, the middle or Shaw bed second, and the

bottom or Martin bed third. Chutes (rooms) were driven up-the rise of the

bed 12 foot wide'on 40-foot centers. Each room was equipped with a galvani

iron ohuto. Pillars wore extracted on rotreat from each bed.

The north and south limb workings in the mine were separate units, but

all coal mined was transported to the surface plant through the same rock

entry. 'The ventilation system of each limb mwas separate.

Thoro was no development in the beds above 'the ska bed. Plans for th

development are shown in figure 11; howover, the mine was abandoned on June 

1946.

Desoription- ofB EVa' Jones Mine

Tho Evan Jones mine, the .only prodwuoirg mine 'i .the .Matanuska field, i

on the Matanuska branch of .the Alaska 'Reti ad 'a ' Jonosville, Alaska. The

output of this coal mine, the. lergost 'iin AJzskE , camp from boeds 1 to 8, wit

the greatest production from. beds 3- n'' 8.' 1Bo'ds 5 and 6 contain high inher

ash material and are overlain by. weak' strata which form. a. poor roof.

Tho mine opening is a single drift driven in ro.k .at water level. (See

fig. 12.) This drift passes thrrough '00f 'doo6 'f glacial drift and approxim

400 feet of rock and then penetrates "th south limb, of the coal-bearing

foimations of the syncline, -whiich- tortbnd: for about 800 £oo.et - Six coal beds

were penetrated in this limb e-f' thoQ sfiylih' - the 00, 0 2, , 3, and 4. T

main drift then extends apprexamatoly' 800' ~iot north.in.rock to the coal be

in the north limb of the syneline;o, -A''od-ry was 'turned west off the main

drift and driven about 400 feot in .the 'roddk'to 'the ,hNq, .3.coal bod west of th

Jonesville fault. The other ooalz 'bad' 'pdine-rted by the main drift as it w

driven north across the north limb of tho synoline and the approximate inte

between the beds as measured in' the' main' IriTt are as follows:

No. 5 - 500 feet inby No;.3 '- '."'

No. 6 - 100 feet inby No. 5

Ob. 7 - 100 feet inby No. 6

No. 8 - 300 feet inby No. 7

No. 9 - 160 feet inby No. 8

No. lo - 240 feet.inby No, 9

The main drift was stopped 350 feet inby No. ,1bo d. -The *strata between co

beds comprise shaly claystonc, 'sandt6ine, and siltstono. The dip of the be

in the south limb of the synclirle 'ranges from 11. to. 50. ,N. All minable co

has boon extracted in the beds 'in thu south limb. pf the. syncline east of th

Jonosville fault. This fault orosses' 'he main dfit, about ;1400 feet north

of the mine workings in the south' limb'.

The sequence of the beds in the 'inortilimb of'.the synclinc, in descend

order, is 4, 5, 2, 1, 56,6 7, 8;'9;'xid'JiO, The dip of those beds ranges f

25° to 35° S, The coal in bed 8 was developed for about 4,700 feet west alo

the strike of the bed, and about 50 percent of the coal above water level w

4

4564 ~ 11 -
extracted. Mining in this bed was discontinued in. 1942. Beds 5 and 6 were

devolopod for approximately 2,700 feet west along the strike, and part of the

coal was extracted, Mining in No. 6 bed was discontinued in 1945 and in No. 5

in 1946; however, No. 5 bed was reopened in 1950.

At present, approximately 85 percent of the present production of the

mine is from operations in the No. 3 bed and 15 percent is from the No. 5 bed

in the north limb of the syncline. The thickness of the No. 3 bed ranges

from 8 to 12 feet. A section of this bed measured in the No. 8 chute main

gangway at 18 crosscut follows:

Material

Roof - claystone.*.O.. ...........

Roof coal,. *,f*.o,.o**.. *C.......

Hard clays tono ... ,....

Hard claystono*.... **.** . ... .*o

COAL .. a.. a.e . a e.e *a at.... SO a 

Fine sandstone parting ..... *......

COAL. ............ *e.. e * ......

Siltstone, thin coal stringers.....

COALe.......aaeCee. 9e C.... e.ee.m

Siltstone, occasional coal

stringers,.C r*.. a. ......... ...

OOAL.,e........, ............. e...

Hard claystono lens....,.......

CXOAL.e.a. *e , ,Ae.*P . . * a e*I* 

Claystone lens e**.......* ....... **

COAL.... e C .CeeeSe*.e ..... 00***

Bottom coaly claystono (upper contact breaks well)...............

Bed thlclness......................

Cbal thickness, *t.***t , *.,..

A section of No. 3 bed measured at approximately

strike entry of the Evan Jones mine follows:

Thickness

Ft. in,.

2 0

1

5

1' 5

1/2

4

1/2

1 1

2

5

8

2 5

1/2

5

1/2

7

1

8

7

0

2

1

75 crosscut in the 

Material

Shaly claystone roof

OAL ......................... *..,

Silty ironston .. *...... ... **.....

COAL. .. ,0...C........ . # .to, a*. aa

Ironstone... .****.....***.*.**....

COLL... ...........................

Claystone floor (l-inch ironstone)

Bed thicknoss . ... ,.. . ....... .

Coal thickness.............. ......

Thiiknoss

Ft. in.

2 8

1

5 5

1

1 0

99

3

1

A section of No, 3 bed measured at approximately No. 9 chute in the strike

entry follows:

4564 - 12 -

- - -
I'

:!! /"'7 f NI k f &EL ,i·j- ~9111c

Figure 13. - Portion of the Evan Jones surface plant.

. af 1

t

Figure 14. - Dormitory at Eska, Alaska.

a

'. £ I

Figure 15. - Tipple and preparation plant, Eska, Alaska.
I

Thickness

Material Ft. in.

Silty claystone roof

OOAL..... ........ . ...... , .... 1 5

COAL,........................,... 2 8

Siltstone** 4

,0 I I e · illo · 0 e - , , 2 .

Soft claystone, ~Pugy...,.*..,#.:,.

COAL..* .* .s. .*.......*.. .... * e . 2 8

Brown clay, soft at bottom......... 3

COAL...., .... . e s... .. . e., ,e..... 5

Coaly claystone.. ................... 1

Coal, shaly.*....... .........,... 1 3

Siltsono bottom

Bed thickness ..,................ 9 11

Coal thickness. ....... ...... 7 7

The dip of this bed avoragss: 350 in the present workings. The chute-andpillar system of mining is used. The haulage entry (gangway) is driven on

the strike of the bed partly in the 'ootwall so that the bottom of the bed is

at car height. The entry is driven 8 to 10 foot wide and about 8 feet high.

Three-piece timber sets are used to support the roof whore necessary. Tho

airway (counter) is 60 foeotup the rise from the gangway. Rooms are turned

on 50-foot centors and driven 10 foot wide and about 5 foot high up the rise

on advance for a distance of about 1,100 foot. A block comprises 10 rooms.

Crosscuts between rooms arc on 50-foot centers. After tho room has been drivon

to its limit, the upper 3 to 7 foot of the bed and pillars are extracted on

retreat. Pillars are oxtracted by taking off successive anglo slabs. The

coal flows by gravity to a chute on th haulagcway.

Blast holes are drilled with pnocunatic drills, and the holes are charged

with permissible explosives, tamped with sand stemming, and detonated

olectrically.

Rooms are advanced by one man, but two men are used in a place in retreat

mining.

Six-ton storage-battory locomotives and stoel, drop-bottom oars with a

capacity f' 5 tons each are used in transporting the coal from the Working

places to the tipple.

Ventilation is provided by a propeller fan with a capacity of 40,000

cubic feet per minute. The fan is operated blowing, and the intake of the

ventilation system is on the gangway. The air passes from the gangway to

rooms, travels through the counter, and. is exhausted through a room driven to

the surface. There is a steam-driven, 60- by 36-inch, centrifugal fan for

emorgency use.

The production of the mine, about 650 tons a day, is prepared in a preparation plant. The plus 5-inch coal is hand picked, and the minus 3-inch is

washed in a jig or a hoavy-medium cone: (See fig. 13,) The coal is

used by the Army, the railroad, and residents of Anchoragp.

4564 - 13 -
Power is gnerated at the mine by a 300-kilowatt, 440-volt, 3-phase, 6 0-cycle alternating-current, steam-turbine generator. There are two 70-

kilowatt, 440-Volt, 5-phaso, 60-cycle Diesel-driven generators for emergency

use.

Interpretation of Drilling. IRysults nd Est'imate. of Coal Reserves

The information and .data p.or.tainng' to the b'hctmiGc charactoristics of

the coal beds are shown in .the qppendix. Th t e sm used in reporting reserves

are defined as follows: ,,.

1. Ranlk of Coal. -. The.rc nof tho coal in this *area is high-volatile

bituminous, according to.,the s$tdard Specifications of the American Society

for Testing Materials.2/, ; .

2. Overburden. - The overburden is 1,000 feet or less above water level.

5. Classes of Reser-ves .- e.e rosoros' oaf coal in this area are reported

as measured reserves. There will be rno os'Stimato of indicated or inferred

reserves, MeaSured coal is defined as follows:

Measured Coa1. - Measurod coal is that for which tonnage is computed

from dimensions revealed in outcrops, trenches, mine workings, and drill holes.

The points of observation and measuroment are so closely spaced and the

thickness and extent of tho coal so well-defined that the computed tonnage is

judged to be accurate within 20 percent or loss of the true tonnage. The

limits of accuracy of the estimate should be statod. Although the spacing

of the points of observation necessary to demonstrate continuity of coal will

vary in different regions according to the habit of tho cool beds, tho points

of observation are, in goneral, of the order of 1/2 milo apart. The outer

limit of a block of measured coal, therefore, shall be of the order of 1/4

mile from the last point of positive information (that is, roughly one-half

the distanco between points of observation),

Whoro no .' data are available other than measurements clong the outcrop,

but where the continuity of the outcrop is measured in miles and suggests the

presence of coal at great distances in from the outcrop, a smooth line drawn

roughly 1/2 mile in from the outcrop is used to mark the limit under cover of

a block. of coal that can also be classed as measured.

4. _Bed-Thicknoss Range. - Reserves in each coal bed are tabulated in

bed-thickness ranges, as follows:

14 to 28 inches.

28 to 42 inches.

42 inches and more.

Those measurements represent total bed thickness, including all coal and

partings in tho bed. If the top or bottom bench of a coal bed is separated

from the rcmainder of the bed by a parting of equal or greator thickness than

the bench and usually is not mined, such bench and parting are omitted in

determining bed thickness.

2p/ nierican Society for Testing Matorials, Standard Spocifications for

ClassifiCation of Coal by Rank: 1959, pt. III, pp. 1-6.

4564 - 14 -
1

Thiclmos s

Materi Ft. in.

Claystone zoof

Coal, thin streaks of bon,.. 2 0

Goal and. bone ,.............. 1 0

COAL UOAL· ''eeeeo*1e)e-~ ~e.....*, , 11J

SiltstonCe. o.,.f o r ,,,, rr, t . t * ? .. 1

CO/L ........................ 7

Siltstonoe ....... .... ., 2

Coal, stroeaks of bone.,..., 7

Claystone ....... ..,.... 1

Coal and bony coal.......... 2 6

Siltstone......... .... 5

Coal and bono......,....... . 10

Clays tone , ................... 1

Coal and. bono,...,,. ..

Silty claystone bott ...

The estimatod measured roserves in the No. 5 6oal bed

investigatod in the vicinity of Eska 2 mino is 74,000 tons.

4564 - 15 -

5. Thickness of Coal, - In computing the volume of reserves in each

thickness category for each bed, the total thickness of clean coal and bony

coal in tho bod section is used. If the top or bottom bench of coal described

under definition of "bod-thickness renge" is seldom mined., the thlickness of

tho bench is not used to compute the volume of reserves. A weighted avorage

thickness in each thickness category for each drill hole area of eachhbed is

computd. . .'

6. Woigt of Coal. - Estimated coal in place is based on 1,800 short

tons, per acre-foot. .

7. Recoverable Rcscrvos - The minimum bed thickness of recoverable

reserves is 28 inches, because this is about the minimum thickness that can

be mined aoochniicaily ( hmad-loadod on conveyers).

DESCEPTiION OF COAL BEES

A. st i o hod he,be p fl , 

A section of the bed pcnotrated in holc 15-l6 follows: I - - .1. *.1 w -.

Ft. in.

167 T

Thickness

Material ' ij in.

Bony col,,... .... 5

aOLL ......... '........... ' 6

X Bony coal. * ... . ..-.. , .. 1.a 5

Member mrOke . (X). .s. ,from ml.

Member moz'kod (X) exCludodo frm samplo.

RQemarks

El., 1,232 feot;

lab. No., C-48684.

A soction

follows:

of this bed measured in tho Evan Jones mine noar No.. 17 chute

in the area
No. 6 Bed -.

A section of the bed penetrated in hole 13-16 follows:

It. in.

26 o

Matorial

Bony coal,.....*., *.,e...

C ,...... ,,*t,*******« t w*@,

Thickcnss

Ft. in.

2 1

1 9

Rcmarks

El., 1,191 foot;

lab, No., 0-48735

A section of

follows:

No. 6 bod noosurod in the Even Jones mine noar No. 33 chuto

Material

Clays tone roof.

Bono and coalyclaystono....

ODAL.*.,e...................

Siltstone .o........*... *

Buff siltstono ............

O0AL.e.,w*.... ....w wee.....

Claystone....e..... .*,°. #, 

LOAL...e . .e.wee ... eee eeea*c

Siltstonoe.... .............

Claystono.... .,......,.

CO UJi ****@ @***************

C)ALL..sw. .eee.*. eea ....... w 

Clays tone bottom.

Thickness

Pt. in. -cc

2

1

4

9

0

1

2

1 4

2

10

6

6

3

9

No ostimato was mado of measured reserves in this

able physical charactoristics of the bod.

Chapin Bed

A section of tlo'bod in hole 13-16 follows;

bod because of unfavorFtt.

302

th Thiclnoss

in. Material '' ' ' Ft. in.

-0 OXoDA ................ 1 -g

X Bono....... ;;;;.;...... ...; . 5

Mimber marked. (X) oXdluddc from sample.

A section of the OCapin bed in h11d 15-16 follo-s:

h .. .. Thickness

in. Matorial ...... ''... in.

9 COAL **............*.*.**;;.. 1 2

X Ironston..........,,......, 1

COAL......w.e ............... 4 9

Member marked (X) oxcludod from sample.

- 16 -

Remarks

El., 1,119 foot

Lower Chapin;

lab. No.

C-48767.

Rcmarks

El., 717.0 feoe

lab, No.,

C-51677.

Ft.

566

4564
The; estimated measured reserves in the Chapin bed in the area.investigated

in the vicinity of the Bska 2 mine is 357,000 tons. '

&bery or Io. 8 Bed

-.. .A section of the bed penetrated in hole 13-16 follows:

Depth Thickness

Ft. in. - Material Ft. in.

4' X ' . , , O., . . . .. w .... i. ,. a I l, .9. 3 9

A section of the bed penetrated in hole 15-16 follows:

Depth - - . Thd c knes s * * '' * * -* . .- * ** ; itclmseaS

Ft. in. Material Ft. in.

; 8 Bony codal, bone; and coal.... 2 8

X Silty claystono............. 2

Bono, bony coal, and coal,.. 2 11

Member marked (X) excluded from sample.

A section of this bed measured in the Evan Jones mino at

of the No. 8 bed entry and the rock tunnel follows:

Thickness

- Matorial Ft. in.

Coaly claystoino. roof . . v .. , 

- Silstone and coal interbedded. 9

Bony coal ............ ,,,,.. 6

Siltstone ..... ,.. ........ 5

Bony coal,.,.,,.* 2.....,,;, , 8

Siltstone,...*.„.....,.*..... ,7

0OAL.........*I·~............. 1 0

COAL,......................... 2 2....... 2 8

Siltstone with stroaks of bone 5

COALo. .*. !.. . .... * 4

Claystone bottom.

Remarks

El., 1,054- feet;

lab ..'No.,

c-48774.

Remarks

El., 616.7 feet;

lab. No.

C-52596.

the intersection

Tho estiiated, measured reServeS of tho Eory of No, -8.bed

investigated in the vicinity of Eska2 mrin is 432,000 tons,

'Eska Bed'

A section of the bed in hole 15-16 follows:

in the area '

I . I .

t . t , .

, ' i . 'L ,

' - 4 . . I j '

t

' & 'I jR rks

D pth

t Ft. in , ,

. 80 .

Material

. 0al, including ironstone

stroak..... .........

Coal and bone,..............

Thickness

t. in.

2 5

2 : ' 0

t

4564 - 17 -
The estimated measured reserves in this bed in the area investigated in

the vicinity of Eska 2 mine is 142,000 tons.

Shaw Bed

The Shaw bed was mined in both the north and south limbs of Eska 2 mine.

A section of the bed penetrated in hole 13-16 follows:

Depth

Ft. in.

701 1

r 'M'Thickness

Material ' *

OOAL..*J ... *....,,.**.....w.* 1 0

3Bone...w. ........ ,,..@...*.. 10

Claystone with streaks of bone 2 0

Bony coal and bone..*......*.. 2 0

Bone ,.' .. *.......,.... ..... * 1 0

Bemarks

) Lower bench; el,,

) 786 feet.

The estimated measured reserves in the Shaw bed in 'the area investigated

in the vicinity of Eska 2 mine is 183,000 tolns.

Martin Bed. . . .-

The Martin bed was mined in the south limb of the Eska 2 mine and a

section of the bed penetrated in hole 13-16 follows:

Depth

Ft. in*

727 0 O

Thiclness

Material Ft. in. -7- Bono e...**, . 1 - )

Coal with a few thin bony clay- )

stone partings- mosetJy, at base 3 6 )

Remarks

El., 770 feet;

lab. No.,

c-48769.

The estimated measured res-rvero in this bed in, the area investigated in

the vicinity of Eska 2 mine are- e0600 tons. ...... .. '.., 1-, ... . . . .. .

The estimated measured coal. reservesw in .the .vicinity of the Alaska Railroad

Eska 2 mine are recapitulated In -table!,1-. .............

TABLE 1. - Etimated measured coal reserve- in vioinity of Eska 2 mine,

January 1i 1946'

} Th*ickns &____ _ TTotal

-28" to 42 4222 and more j Measured., Recoverable; 2

Bed tAores Tons Acres Tons i tons tNo. 5 V.... .. I - 9 74,ooo0 74,000 57 co

Chapin...... -. - 55 57,0001 557 00 0 178,500

Emery........ - 64 432,000 - 216.000

Eska .. ... . 354 142,0000 - 1,000

Shaw.4 18;000,- 183,000 91,500

Martin.,b,.2. - - - 4 210,60o1.. 2o,6o00 105 LOS:-

- t ateal re.r, 501 , - , e 'tI 1 98. . 00 ,6 -

1J Estimated recovery, 50 percent. ' - , - 4 * .

- 18 -
11I

E

INVESTIGAION OF COAL DEPOSITS IN AREA EAST OF ESKA CREE

Proliminary Ecamination

A roconnaissance of the area was Lade in 1946 by engineers of the

Bituminous Coal-Mining Section, Bureoau of Mines, and Federal Goological Surve

geologists. Banios 21

-/ reports that as much as 4 raillion tons of coal might

occur east of Eska Creek if structural conditions persist as indicated on the

east bank of Eska Crook and in the oast mine of the Alaska Engineering

Conmission. The existence of favorablo structure for mechanized mining was

indicated in shallow holes churn-drillod by the Alaska Engineering Commission

and reported by Tuck.2/ Tlho dormitory at Eska was available for housing

minors and the tipple; preparation and surfaco plants also were available

should the investigation prove ihnablc'rosorvos. (Soo figs. 14 and 15. )

Adequate water for diamond drilling was available in 3bka and Knob Creeks.

The area was found to bc accessible oand road and hole locations wore made.

Road Building

Roads were built cast frorn Ika to drill sites with a bulldozer. The

roadbed of the main road was constructed 10 feet wide and was built along a

glacial moraine. The road was 'suitable for truck and automobile travel, exce

in extremely wet weather. About 2 miles of road was constructed across gentl

sloping terrain at a cost of $1,'500 per mile.

Dianonl. Drilling

Diemond drilling was done under contract between tho Bureau of Minos and

Lynch Bros., dicaond-drill contractors, Seattle, Wash. As a guide for

estimating the cost of drilling under similar conditions in 1947, unit contra

prices aro given:

Schea.ule of unit prices

Unit price

ton

.

No. Articles or service Unit

1 Drilling and setting standpipe through

overburden to accommodate continued

drilling as ordered by resident Government engineer:

A. 0 to 50 feet........... ·......... Foot

B. Beyond depth of:50 feet............. do.

2 Prices to bb paid for drilling from

bottom of standpipe to bottom of hole:

aIilling with diamond bit to secure

core of 2-1/8 inches minimua diameter.. do.

Vortical

holes

$ 7.65

8.65

8.10

Inclinod

holes

$ 8.15

9.15

8.10

i/ Barnes, F. F., and Byers, F. M., J., Work cited, footnote 5.

/ Tuck, Ralph, Work cited, footnote 6.

4564 - 19 -
Schedule of unit prices (Cont.)

Unit price

Item

3

Articles or service

Additional diamond-drill core boring as may

be ordered by resident Government engineer

in excess of minimum guarantee for items 1

to 2, inclusive, shall be perfolred at a

reduction in prices of 90.25 per foot.

Vertical

Unit holes

Foot

IncloLed

holes

4 Reaihng hole and. installing casing......*.. do.

5 For cementing, waiting .rcement to set,

and drilling out ceent................. do.

6 Surveying ..................... ........ Hour

$ 2.60

2.60

8.00

$ 2.60

2.60

8.00

55.00

7 Plugging holes with cement from bottom of

hole to 50 feet above minable coal beds..

Per

hole

The thickness, physical characteristics, and extent of-the coal beds in

the upper part of the Chickaloon coal formation were determined by diamond

drilling, which yielded 2-1/8-inch coal cores. Chemical and petrographic

analyses were made of these cores, and the dip and strike of the beds were

computed Iom the logs of the holes.

Each hole is designated by a serial and section number separated by a

dash and followed by the letters EA. The serial number designates the order

of drilling, the section number is the number of the section in which the hole

was drilled, and the letters EA represent Eska, Alaska; for example, 1-15-EA

indicates that the first hole is located in section 15 at Eska, Alaska. A

typical drill set-up is shown in figure 16. Roads between drill holes were

built with a bulldozer. (See fig. 17.) Detailed logs of dr-ill holes are given

in the appendix. All drill holes were vertical. The locations of drill holes

(fig. 18) in T. 19 N., R. 3 E. of the Seward meridian are summarized as follows: 

Hole

1-15 FA

2-15 EA

5-15 E

4-15 EA

5-15 EA

6-10 EA

7-10 EA

8-10 EA

9-10 EA.

Location

780 feet S. and 10 feet E. of NW. corner sec. 15.

915 feet S. and 715 feet E. of NW. corner sec. 15.

70 feet S. and 640 feet E. of NWt. borner sec. 15.

405 feet S. and 1,250 feet E. of NW. corner sec. 15.

480 feet S. and 2,000 feet E. of NW. corner sec. 15.

60 feet N. and 55 feet W. of S. quarter corner sec, 10..

590 feet N. and 1,760 feet E. of SW. corer sec. 10.

880 feet N. and 580 Tfeet E. of S. 1/4 corner sec. 10.

1,315 feet N. and 870 feet-E. of S. 1/4 corner sec. 10.

Diamond drilling began on May 19, 1947 and continued until October 15, 1947

was recessed until May 7, 1948 and completed August 21, 1948.

I

4564 - 20 -

----
?^L ·- Fat" A

t| . * '

*St

-* rw i .

»X '""^^ST^ ^ /*' -'"""*

B'/.^A.s .^s is.

I I

f K W. IL

*.

i . I

Figure 16. - Diamond drill set-up at hole 2-15 EA.

t.

S V

W- , y *)A. -;"" 111-~ " 2

** *\I , ^ .' '

: 1, lU W", ·· x < y , " "« SK. ' ***.. A.. .*t

*^ r I-. : IL - , I . .... tx a

! qI., X~ , . .

,,r VkFigure 17. - Bulldozed road east of Eska Creek.
- uI r I i1 ' , , -- -r ; '/

. / - /

/- -.----- ... . I',rX---QC

/ F - , ' t / = - = = fiyes

\ 7 o m

-0 -y / - / CHACEA,' , ^

7 "-- ' . .' '"-.- --- . .C

:.-'A." ~ .- . L/.,/ Ii -)„ 

' / ' · '' / > [ -

.i.. ... ' . , . .·" ~ I·.0 /,, · r,·· ii/ ""

'- '

/.,..- .'? ,'- Ark" I t,, , ,> /

"" ;-- / '"' I -,' i . -

V -\\ . ,..,' / · . .' _ I 

- /- .- . , , '~,. . .,,

,. ,-no. ,-,: " ~ .~i D. .... ~~7e~I

" /'.'I ~ -~'-" -'c ~. r~. , /'L "~'~ ,.... ~r~ ,.5'.- / ~ "' Y'' r

'" ,I" //, ''>'-.:,,-:%;....

'~--" ,.'. " ~~

Figure 18. - Area investigated east of Eska Creek, Alaska. (Base map by Geological Survey).
Progress of drilling follows;

Holes drilled......... ...... ... .. .......*................ . ..... 9

Footage. ... · ·.. *.*........· ···....... ·..·... ·..··· .. .. ... *.· 5,158

Overburden (standpipe ) c,.ccc* *,e ..... , ..... ........ *c ... ,.,.., 206

2-1/8-inch core drilling........... ............... ... ......... .... 4,952

Drilling shits................................................... . 296

Feet per drilling shift............,...,...........c.. 17.4

Total shifts, including moves, repairs, and other delays (1 drill two

8-hour shifts per day 6 days per week)..............c.....*....... 475

Feet per shift (total shifts)...... ,............................. 10..9

Average cost per foot.c., ..... ......... c......... .................... $8.58

Strata Penetrated in Drilling

All of the drilling was in the upper part of the Chickaloon formation,

which comprises conglomerates, sandstones, siltstones, claystones, and coal beds.

The geology of the area investigated is shown in figure 8. Coal beds outcrop

along the east and west banks of SSka Creek, and there also are outcrops of

unidentified coal beds in Knob Creek. Between EBka Creek and Knob Creek the

coal beds are covered with alluvium and glacial drift and the outcrops are

concealed. The glacial drift and alluvium, which occurs between Eska and Knob

Creek, ranges from 0 to 50 feet in thickness and averages 20 feet. Fragnents

of coal are found in the glacial drift.

The coal beds penetrated by drilling, in descending order, are;

Maitland group:

Chapin

Maitland

David

Emery

Bod 9

Eska group:

Eska

Shaw

Martin

A, B, C, and D

Little Ieka group

Description of Alaska Engineering Commission East Mine

This mine was developed by the Alaska Engineering Commission for the

Alaska Railroad by driving strike entries in the Maitland, David, Emery, ESka,

Shaw, and Martin beds. (Sec fig. 18.) The strike entries wore started at the

outcrops in the canyon of Eska Creek and driven both east and west. The east

entries followed the beds on the strike to the northeast fault, and, after

passing through this fault, followed the strike of a bed above or higher in

the series of beds. This is demonstrated by the entry in the Eska bed, which

was driven east to the northeast fault, then into the Emery bed, which is 540

feet stratigraphically above the Eska bod. The entry in the David bed follows

4564 - 21 -
the David bed east, passes through another fault edst of the northeast fault,

and continues eostas a strike entry,in .the Maitland bed. In both of these

entries the beds'inbythe faalt are downtrown. (S36'fi8g;184) -The.Y1ds ,

developed east of'Eka' Creek wero.in the north limLb of'a'synelin and. Lho beds

dip about 15° southwest-on the east Xide of' 'nthenort t fault and about 526

southwest, on the wbst' ide' of the- northeast fault. '(Se' rig. 18. ) The coal

was mined up the' r'ise from tfio strike entri±s above' watb level. The Emnery,

David, and Maitland beds wore the only beds extensivoly e inid oast of the northeast fault. Tes'o 'bds thvo *not -bean .davcopod below water levol, nor have

thoso beds (oxceit'thi Maitland) boon .dAQvoqpod east of a second northeast

fault. The mirinii'g 'tom followod was .chrtq-and-piIiar and some pillars wore

extracted.

Description of Knob Creek bal Co. Ehtries

Two short entries were driven by the Knob Creek Coal Co. in an area

about 1/2 mile east of Eska Creek. These entrios are shown on figures 7 and

18. Tho first entry, which is 120 foot east and 200 foot south of the north

quarter corner, sec. 15, T. 19 N., R. 3 E., at an elevation of 1,C92 feet, was

driven N. 10o W. as a single entry through glacial drift, claystone, and

siltstono for 130 feet in 1947. The strike of the claystone in the entry was

N. 80° W. and dip 90 north. No coal beds were penetrated in the entry. The

portal of the second single entry is 900 feet east and 400 foot north of the

south quarter corner, sec. 10, T. 19 N., R. 3 E., elevation 1,140. feet. This

entry was started in the fall of 1948 in a-coal bed above the Little Eska group.

A fault was encountered about 100 feet inby the portal in 1950, and development

was discontinued, Tho entry was being driven toward hole 8-10-E. in which the

Eska group of coal beds were penetrated.

INTERPPEATION OF DRILING RESULTS AND ESTIMATED MEASURED RESERVES

OF COAL IN AREA EAST OF ESKA CGRE

Dotailed logs and analyses of the cools are given in the appendix.

Sections and structural contours of the Eska, Shaw, and Martin coal beds are

shown in figures 19 to 21, inclusive.

All of the coal beds have a tendency to be lenticular and thd thickness of

coal, bony coal, and bone varies in each drill hole. All of the coal must be

beneficiated by removal of extraneous high-ash portions to obtain satisfactory

fuel.

A description of each coal bed, in descending order, follows:

Maitland Bed

The outcrop of the Maitland bed is shown in figure' 18.

A section of the bed penetrated in hole 1-15-EA follows:

4564 - 22 -
I

//

F, /

'.a;r)

/

110o ceaC09 c

I,

//0,680] tsnoeso' I

I

I

I

15

C

ClI

/

/0oo 0 MO 4oo00

Ask

---to0: On..nd d0d/,i/Ie

--- Concea/ed cos/ be/

S Plrof tec·ry

-- c- - trcrw

-- Concc/rsFd &Ft

e/tvaotrnt o asnf/row _ i M _ d .ureore.re.

ODrecf onr odtFs ovemen.

e/KA

Figure 19. - Eska bed in area east of Eska Creek.
/ /

/

/

/ /

/"

0 /

o -

6o -

I \ I% l

"to - \ \ / 

~I . / O t9-CffMix/ / - 900 -. | f 0

' ," / I 1

",~-. - -/ . C- ,Yi' ,7 , i'

---"' 9 '3'- . . "P / t

.,- I t, , .

i I' \a * , ,C/- - t"f .' . ... %_ * 'sss;,;, . '> ia,- " 4 j ,,I ~ .

i '3⁄4 eo / \ ./ .&»,c ~ ' .3- 5 -N c& 6-k,' I ·

- c ' °. " C , ' "' ,-o, A' i ".5 

:i , .. , . . . ' j , J-. , ' .c Son, . t. 1 ' , ' ., '

o t I r ki `r

t! / '; / , .5 I .,4 / -- -f/ ' .

I *a 0 O* w 

. * / P---- crf - Ir, \- ° -- -- orw o 

/06k kf. /4Wt i 'r 4l ;vrsc^ t / o-?on . 3e-?7K

.;I f a70 .o 0/ i c/,// 'o

'/!0/ f . :2-

Sar3C' i-o-

,Sony Cos/ f-3"?

a&/ :9'

c65 0te 0

--- Ii

5'KA

Figure 20. - Shaw bed in area east of Eska Creek.
ff , ,

f ------ ,,  o_

/-------

/ \

I / I"/ , ,Ia

'/ P 0/ /

' _ _ r / C ' / / '/ /501 J /^ /d e \ ,.i -_- ' 

-t----I; &, 7

/ - 6° / / c'/ 

§/^' .0/l /^

I m/an / / // _ 

*I / + / / + / O z~-Az / ..-

/W0 /;/ / s / ,a /O

//`I I 1i;t r / 0a

~-/ .. ... 

Ir-^-------^-'- /Il/ur/~Qhs^

XO 00~ ~ 0 ~ ___ 3S ; 40 ______ X

/

I.

I

/

wq Azgwc r//ct/*e -- Conzac0k1col&,

=z Precocf etry

- c ta 'c , pI { aupf,/Xn , O, mn~t'*.,X

-- &tzWrcu- wvemn - AOirn &109nu n

Zf/K'

Figure 21. - Martin bed in area east of Eska Creek.
*

th. - hieckness

Ft. in. Material Ft. in. Remarks

t1 9 OOAL.................... ... 2 E1J., 969.2 feet;

lab. No., C-77879.

A section of the bed penetrated in holo 7?1iO-EW follows': -

Depth - . . . T hicktss ....... Ft. in. Material . .... - Ft; . ". ;" ........ Remarks

b- --- Co.il with thin strocks of bono.;:..; . 5 3' 0 El.1,162.5 eot;

lab. No., 0-98414.

The aroe of this bod is smial, and no ostimate of reserves was made.

Davvid Bed

The. 0utdrop of the David 'od is .^ow.V in tiw.rol .. .-

A section of the bed ponotrated in holo 1-15-" follows:

Depth Thickness

Ft. in. Materigl Ft. in. Remarks

9 -

106 COAL,......,......,,,.9,4,5....6. . , - E., 924.5 feet.

BQny coal.. .... .... ,........... 2 0 ·

A section of the bed penetrated in Iole 7-10-&A. follows:

Depth Thiciness

Ft. in. Material- . l . in, Remarks

102 0 Coal with thin streaks of bone 5 O El., 1,121.0 feet;

lb. No., 0-98417.

The area of this bed is small, and no estimate of reservesR was made.

flery Bed.

The outcrop of the hEery coal bed is shown in figuro 18.

A section of the bed penetrated in hole 1-15-EA follows:

th . Tic s . .

Ft. in. Material Ft. in. Remarks

1553 COAL.... .......... .. ,.*... ... 3 EL.,. 877.5 feet;

lab, No., 0-77880.

A section of the bed penetrated in hole 5-15-ES follows;

Depth Thickness

Ft. in, Material Ft. in. Remarks

91 0 Bony coal with streaks of coal ...... 2 5 El., 984 foet.

4564 - 25 -
A section of the bed penetrated in hole 4-15-EA follows:

Depth

Ft. in

22 5

Material

COAne.... .... ,...*.. ee..eeee......e

XBony coal..... ,....*... ...... .,.

OMember marked ) excluded from sample.

X Bony coal «*,**** *,,*****

Member marked (X) excluded from sample,

ThicknessFt. in.

2

1/2

9

1

1 6-1/2

1 2

Remarks

El., 1,041.8 feet; -lab. No., 0-83519.

A section of the bed penetrated in hole 7-10-fA follows:

Depth

Ft. in. Material

215 0 Bony coal. *.................. *·...*

Thickness

Ft, in. _ Remarks

1 0 El., 1,010.0 feet.

Xhe area of this bed is small, and no estimate of reserves was made.

Ebka Bed

The outcrop of Eska bed and sectionS of the bed penetrated, n holes 1-151Ea,

2-15-EA, 5-15-EA, 4-15-EA, 7-10-EA, and.8-10-EA are shown in figure 19. The

estimated measured reserves in the area investigated east of Eska Creek are

477,000 tons, and the woighted average thickness of the coal in this bed is

55 inches; thickness of the bed is 41 inches.

The Eska coal bed comprises one bench of coal in which there usually is

included one thin.streak of bone or ironstone; however, the entire bed was mined

in the Eska 2 mine. This bed has the least partings and extraneous material

of any bed in the area. The extraneous material can be removed by washing in

a preparation plant. Analyses of the coal in the bed are given in the appendix.

Shaw Bod

The outcrop of the Shaw bed and sections of the bed penetrated in holes

1-15-EA, 2-15-EA, 5-15-Bl, 7-10-EA, and 8-10-EA arc shown in figure 20. The

estimated measured reserves in the area east of Eska Creek are 955,200 tons,

and the weighted average thickness of the coal in this bed is 87 inches;

thickness of the bed is 138 inches.

The Shaw coal bed comprises twq and three benchqs of coal separated by

clayston; .hoowver, where mined in the Eska 2 mine, this bed occurred in two

benches, and full-seam mining was practiced in developing the north limb to the

west, The extraneous material was removed by hand-picking the large sizes and

washing the smaller sizes. Analyses of the coal in the bed are given in the

appendix.

4564 - 24 -
Martin Bod

The Martin bod outcrop and.soetions -of'-thebod ponetrated in holos 1-15-EA,

2-15-EA, 5-15-BE , 5-15-FEk, 7-10-Ehk -and.-8O-lEA, aro shown in figuro 21. The

estimated measured reservos intthe area invostiltod -oast of Eska Crook aro

678,300 tons, and the woightoed'average thickness of coal in tho bed is 50

inches; thickness of the bod is '65 -inches

The Martin coal bed is multiple-boddod and generally occurs in two bonchos

separated by a parting that rangs from .4 to 24 -inhes -in thioknoss. The benchos

of coal aro lonticular, and mining -i -difficult. Analyscs of tho coal in the

bed are givon in the appendix. - .. . ..-

-, , .... ;od A .- ..

The oucrop of bed A is shown in figure 18, and soctions of the bod

penetrated in holes 6-10-EA, 8-10-EA., and 9-l10-EA are given in the logs. This

bed ranges from 13 to 24 inches thick.

Bed B

The outcrop of bed B is shown in figure 18.

A section of this bed penetrated in hole 5-15-EA follows:

Dopth Thickness

Ft. in. Material Ft. in. Remarks

130 7 COAL......,...*............. ..... 2 2 EL., 937.4 foot;

X Boneo................. 2 lab, No., C-83567,

OOAL .... I,..* ......... 1

XBone ...... , ,.,.,, 2

COAL* C~OA e.e.,, ~ ; · ...... .. , ....... n

11

X Carbonaceous siltstono........ ....... 1

X COAL.............. .~. *. ,.,..*. · 9-1/2- .

Member marked (X) oxcludod-irom sampleo. ...

A section of this bed ponetratdtein holo .61O-F- follows:

pth Thicknoss

Ft. in. Material Ft. in. Remarks

T 3 COOAL..... ........... ............. EL. 1,012.2 foot;

lab. No., 0-97349.

A section of this bed ponotratod in hole 9-10-EA follows:

- 25 -
Depth

Ft. in. Material

21 -6 COAL............,....,...............

X BIronsone o.....e....... . .... e *o* .

COALe ** ,..0*9 e...... a**eee * * .........

COAL$.e* X.0...0o0090 .... e.- eel66.0.* ee, e *****e*ee*. e*..ee. e*ee,.,.e *

X Bono,*':::::::*:*:***.*

COAL*»*************««******«***

X Shale and bone............... ......

CO.AL.aea. e...a e * so a cc.. 9*0e e 0.e0 c

Thiclknss

Ft. in. Remarks

2 6 EL., 1,142.5 foot;

1 lab, No., D-8011.

2 2-1/2 '

5-1/2

5-1/2

1

1/2

1/2

1-1/2 -l/2

4-1/2

4-1/2

Ivamber marke°d (X) excluded from samplo.

A small area of reserves is indicated, and an

was made by the Knob Crook Coal Co.

attempt to develop this area

Bed 0

Bed C was penetrated in holes 5-15-FA and 6-10-EA, and the thickness of

the bed rangod from 8 to 20 inches.

Bod Df .... .. .B od 3 . . . ...

ho outcrop of bed D is shown''. . figure 18. A' section of this bod

penetrated in hole 6-10-EA ibFlows; ,.

527 10 OOAL.......... .. ............ ....... 11 EL., 795.2 feot;

X Ironstone and coal.................. 1 lab. No.,C-97351

COAL*.*(.. t.... . .. *.t... 8

X Ironstone and coal....,.,....*a ....... * 2

ao * A.... .,.** .... . .,,. , ,,,...,,...... 1 1

Member marked (X) oxcluded from sample.

A section of this bed penetrated in hole 8-10-BA follows:

DeRpth Thioknoss

Ft. in. Material Ft. in. Remarks

583 10 COAL.... ..... e........ ,,,.. 2 1 El., 639.2 foot;

lab. No., D-555.

A section of this bed penetrated in hole 9-10-EA follows:

4564 - 26 -
lDgpth Thickness

Ft. in. Material Ft. in. Remarks

706 -F oal with thin streaks of bone ........ 2 1 lE., 956.5 feet.

This bed rangSs from 25 to 55 inches thick.

Little EJka Group

The Little Eska group of coal beds was penotrated in holes 5-15-EA,

6-10-EA, 8-1Q-EF, and 9-10-EA. This group of coal beds is multiple-bedded

and comprises interboddod. coal, bony coal, bone, and coaly claystone. The

Little LEka group comprises the lowest known coal bods in the upper part of the

Chickaloon foimation. The outcrop of this group of bods is shown in figure 18,

and no recoverable reserves were developed in these beds,

The moasurod reserves of coal in the area oast of s3ka Crook are recapitulated in table 2.

TABLE 2. - Coal roserves in area oast of 31ka Creek, January , 192

Ta.To tal ..

Thiclmos s Measured Peooverable1./

14I to 28" I 28" to 42" i42" and more j l'" and moreo 28" and more

Bod A cres TIns jAcrs Tns Acres Tons - Tons Tons

Rska... 35.5 115,5001 56.1 361,500 - I - 47,000 180,750

Shaww.. - I - - 7.29955,200 955,200 477,600

Martin 14.6 46,0001 15.3 68,800 1 0.0i 563,,500 678.500 316,15

'lbtal .... ..... ... * .... * ....... * * * ..... . ...... 2,110,500 974,500

l/ Based on an estimated rocovery of 50 percent.

COAL PREAPATION OF MhhJWS1Kh COALS

Washability characteristics and w.shing coals from the Matenuska Valley

field of Alaska are discussed by Geer and Yancoy, d/ and their summary and

conclusions are given below:

This report describes the washability chcractoristics and

washing of coals from the Eska and Evan Jones mines, the principal

producers in the Matanuska field of Alaska. Scroen-sizing tests

and specific-gravity analyses were made on both coals to evaluate

their washability characteristics, and detailed washery-performanoe

tests were made with the Eska coal.

The Eska coal contains 40 percent of impurity heavier than 1.70

specific gravity, and the Evan Jones cool about half that amount.

Both coals contain, in addition, unusually largo amounts of intermediate-density bony material. The shale and bone associated with

2/ Geer, M. R., and Yancoy, H. F., Washability Charaoteristics and Washing of

Coals from the Matanuska Field of Alaska: Bureau of Mines Ropt. of

Investigations 3840, 1946, 17 pp.

4564 -27 -
both coals is more' resistnt to broakage than the clean coal and

consequently tend to concentrate in the coarser sizes, with a

corresponding'ooncontration of the cleon coal in the finer sizes,

Considering ill sizes togethor, a product of 18 to 19 percent ash

is obtained. by a separation at 1.70 specific gravity. Separation

at a specific gravity of less than about 1.70 entails a largo loss

in yield for the increased reduction in ash content obtained, owing

to the large proportion of bony material in the coal.

The EsIka coal is washed in a modern Baum-typo jig. The jig is

able to make an efficient separation between coal and refuse in

preparing a washed product of 20 percent ash, but separations at

lower specific gravities to obtain cleaner washed coal can be

made only at impaired efficiency. The washing results indicate

that in treating coals of this typo the efficiency of the separation

effected between coal and impurity is influenced by the amoult of

retuso material removed, as well as by the proportion of "neargravity" material present in the coal.

The Evan Jones coal is washed in a manually controlled,

Forrostor-type jig. With this type of jig the quality of the

products obtained is determined largely by the skill of the

operator, and uniformity of operation is difficult to maintain.

Samples of the washed coal collected on successive days varied

from 14 to 19 percent ash. A similar variation in quality is

evident in the record of shipments from this mine.

An important factor that must be considered in connection with

.the utilization of coals from this district is that their specificgravity composition imposes a lower limit for the ash content -to

which they can be washed with a reasonable yield of washed coal.

This faotor is inherent in the character of the coal and, thereforo,

applies oven when the coal is treated in modern, well-operated,

washing equipment. Washed coal having a minimum ash content of 14

percent can be produced, but only with a sharp sacrifico in yield.

If coal of less than 18 percent ash is required, its enhanced value

must justify the increased cost of' preparing such a product,

LPPENDIX

The logs of drill holes in the appendix show the names of the coal beds

penetrated and the laboratory numbers of the chemical analyses of the coal cores

under the column headed "Remarks." Dips given in this column are the apparent

dips of the strata measured on bedding planes in the cores at the depths shown.

Analyses of coal cores' are given in tables 3 and 4 in the appendix. The

column headed "Drill hole" shows, in the order listed, the drill hole from which

the core was recovered, the depth below the surface from which the core.was

obtained, and the name of the coal bed. The columns "Core received," "Core

rejected," and "Core analyzed" show the part of the diamond-drill core that was

analyzod. Iost of the coal beds in the Matanuska field contain partings of claystone or shale and all partings 3/8 inch or more thick were removed before the

sample was sent to the chemical laboratory for analysis.

4564 - 28-
Log, hole 13-16

Location:

Elovation:

Bearing of

1,400 feet W. and 1,040 foot N. of conter sec. 16, T. 19 N.,

R. 3 E., Seward Moricdian, 2Eka, Alaska.

Collar of holo - 1,570 foot.

hole: N. 200 W.

Dip of hole: 56°

Dip angle of strata

southeast.

gsnorally normal to the holo or approxir.toly 340 to the

I

^ jpth,,, ,^ 

FrorL- To -

Pt. in. Ft. in. Material

0 0 6 6 Soil

66 7 0 Clays tone

7 0 12 0 Iron-stained gray clays tone

.12 0 16 0 Gray siltsone

16 0 24 0 Gray claystone

24 0 24 11 Bone and carbonaceous shale

24 11 25 10 Dark-gray shale

25 10 28 0 Carbonacoous shale

28 0 50 7 Coaly claystone

30 7 35 11 Interbe&ded carbonaceous

shale and bone

35 11 36 10 Bony coal

36 10 37 6 Silty claystone

37 6 40 1 Iron-stained silts tone,

occasional streak of

carbonaceous shale

40 1 60 0 Gray, silty claystone

Thickness

Ft. in.

6 6

6

5 0

4 0

8 0

11

11

2 2

2 9

5 2

11)

8

Remarks

&L., 1,337 ft.

Sheared, 46 to

50 ft.

2

19

7

11

60

60

0

1

6o

80

1 Clay gougo

10 Gray claystone, carbonacoous

at 80 ft.

1

t

80 10 81 0 Bone

81 0 83 11 Coaly claystone, silty at

base

83 11I 165 6 Interbodded siltstone and

clays tone, carbonaceous at

103, 112, 136, 145, and

154 ft.

165 6 167 3 Carbonacoous shale with

stroaks of bony coal

167 5 170 4 COAL

20 9

2

2 11

82 7

9

5 1 )

r

170

172

174

175

176

177

4564

4

9

3

8

9

172

174

175

176

177

9 Bony coal

3 COAL

8 Bony coal

9 Bone and bony coal

0 Claystono with thin streaks

of coal

8 COAL

2

1

1

1

5

6

5

1

)

)

No. 5 bed; el.,

1,232 ft.;

C-48684.

C-48685.

3

0 178 1 8
Log, hole i5-16 (Con't.)

From- ToFt. in. Ft. in. Material

178 8 179 2 Claystone

179 2 179 7 Bony coal

179 7 180 9 Claystone

180 9 181 9 Bony coal

181 9 182 2 Carbonaceous claystone

182 2 183 4 Bone and bony coal

183 4 185 2 Coaly claystone

185 2 186 2 Bone and bony coal

186 2 188 9 Cqal, partly bony

188 9 189 1 Claystone

189 1 190 1 Dense, heavy siltstone with

calcite cementing

190 1 198 0 Gray siltstone, occasional

plant fragnents

198 0 204 3 Interbedded siltstono and

clays tone

204 3 207 4 Dark-gray, silty claystone

207 4 209 3 Interbodded fine siltstone

and silty claystone

209 5 215 6 Claystone, silty at base

215 6 215 11 Coaly claystone

215 11 216 0 Bone

216 0 218 1 Bony coal

218 1 219 10 COAL

Thict ,

Ft. in.

5

1 2

1 0)

5

1 2

1 10

1 0

2 7)

4

Remarks

C-487355

0-48734. 

1 0

7 11

6

3

1

6

2

1

5

1

11

35

1

1

9

Slickensides.

)

219

220

220

220

10

3

4

7

220

220

220

221

3

4

7

7

Bone

Coaly claystono

Silty ironstone

Claystono, with fow carbx

particles

COAL

Silty claystono and bono

COAL

Onaoeoi

5

1

3

is

1 0

1 1)

S

1 5)

No. 6 bed; el.,

1,191 ft.,

C-48735.

C-48736.

El., 1,185 ft.,

0-48757.

Bottom of

No. 6 bed.

221 7

222 8

225 1

222 8

225 1

224 6 

224 6 224 8 Bone

224 8 225 8 Claystone, carbonaceous streaks

top and bottom 1

225 8 228 3 Silty claystono 2

228 3 228 9 Dark-gray claystone

228 9 231 7 Silty claystone 2

231 7 252 2 Claystone, with occasional leaf

impress ions

252 2 255 6 Silts tono 3

255 6 237 0 Gray, fine sandstone 1

257 0 259 11 Interbedded siltstone and

clays tone 2

239 11 240 0 Gray clay

2 )

0

7

6

10

Slickens ided.

7

4

6

11

1

4564 - 30 -
Log, hole 13-16 (Cont.)

lDepth

From- To- -

Ft. in. Ft. in.' Material

2-0 o0 5 Silty claystone and claystone,

occasional plant fragments

246 5 252 1 Interbedded silty claystone

and fine siltstone

252 1 276 0 Silty claystone

276 0 280 7 Gray claystone

280 7 282 0 Bony coal

282 0 282 6 Coal and claystone, highly'

distorted:

282 6 283 2 Bony coal

283 2 283 8 Bone

283 8 284 4 Bony coal

284 4 289 6 Claystone, with coal laminae

289 6 294 6 Medium-gray bentonitic claystone

294 6 302 0 Claystone grading into coaly

claystone at base

302 .0 303 4 COAL

Thickness

Ft. in.

6 5

5 8

23 - 11

4 7

1 5)

)

6)

8)

6)

8)

5 2

Remarks

-Upper Chapin;

el 1,137 ft.;

C-44 7 66.

303 4

303 7

303 7

306 0

306

306

325

0

4

2

306

325

325

4

2

6

Bone

Coal, with numerous bony

streaks

Bone

Shattered silty claystone

Bone and coal

5

7

1

2

18

0

6

4)

)

)

3)

)

5)

4)

10

4)

2

10)

6

10

6

4

3

7

6

3

Lower Chapin;

el., 1,119 ft.;

C-48767.

Upper Maitland;

el., 1,100 ft.

C -48738.

Lower Maitland;

el. 1,095 ft.;

C-48739.

325 6 325 8 Dark claystone, with streaks -

of coal

325 8 327 6 Coal, bony at base 1

327 6 328 0 Bone

328 0 330 10 Claystone, with streaks of bone 2

330 10 331 4 Bony coal

331 4 331 8 Calcareous silty claystone

331 8 332 11 COAL 1

332

333

334

334

11

6

0

3

333

334

334

351

351

353

354

356

6

0

3

2

4

8

4

1

351 2

351 4

353 8

354 4

356 1

357 8

358 3

4564

Bony coal

Claystone

Coaly claystone

Claystone with siltstone .bands,

silty at base 16

Ironstone

Silty claystone, grading into

claystone 2

Coaly claystone

Coal and bony coal 1

Dirty coal 1

COAL

Bone

- 31 -

11

2

4

8

9)

)

7)

7

3

357 8

358 3

358 6

David bed;

el 1 076 ft,.;

c -48768.

Highly sheared.
Iog, hole 1i-L6 (Cont. . , ....... Depth 

.From- ToFt. t. Ft. in.

35 ' 559 4

359 4 568 4

368 4 376 2

376 2 358 0

382 0 398 0

398 0

400 1

400 4

400 1

400 4

401 5

401

402

40o

405

404

405

405

409

409

484

484

506

515

527

530

541

541

542

542

544

545

545

545

547

548

548

551

552

553

5

7

5

10

9

2

3

0

9

0

11

9

10

7

0

3

9

0

3

1

1

6

6

7

10

10

4

4

402

403

4o3

404

405

405

409

409

484

484

506

515

527

530

541

541

542

542

544

545

545

545

547

548

548

551

552

553

557

7

5

10

9

2

3

0o

9

o0

11

9

3

9

0

7

1

1

5

6

7

10

10

4

4

0

*, Material

Cbaly clays tone

Gray siltstone

Silty claystone

Fine sandstone

Gray siltstone, carbonaceous

bands at base

Clays tone

Coaly claystone

Highly contorted, calcareous

clays tone

Coaly olaystone

Bone

Coaly claystono

Bony coal

Siltstono, with lenses of coal

Ironstone

COAL

Coaly claystone

Silty claystono and claystone

Fine s andstone

Silts tone

Fine sandstone

Claystone, with silty streaks

Interbedded claystone and.

siltsone

Claystono, silty at bose

Carbonaccous clays ton

Bone

COAL

Carbonacoous claystone, with

coal lonses

Coal, with a few bony streaks

Carbonaceous clays tone

COAL

Bone and oarbonacoous claystono

COAL

Bone

Siltstone

Carbonaceous clays tone

Cbal and bony coal

Siltstono, with coal lenses

11

1 4

10

5

11

5

1

3 9

9

74 5

11

21 10

9 1

11 9

2 5

1 10

1 0

4

1

2 0

1 1

3

5 '0

6

1 0

3 8

19 o

72 6

9 2

1 5

16

2

0

1

3

Thickness

Ft. in.

10

9 0

7 10

5 10

Remartks

) Emery bed;

ol., 1-034 ft.;

C-48740.

) No. 9 bed.

Bottom of B-size

core.

Top of A-size

core.

557 0 576 0 Siltstono

576 0 648 6 Claystono and silty claystone

648 6 657 8 Silty claystone, grading into

silts ton

657 8 659 1 Carbonaceous claystone

I

4564 - 32-
Log, hole j16-l6(Cont.)

___Dopth

From- ToFt. in.. Ft. in,

T 1 r 7

662 7 662 9

662 9 664 3

664 3 665 3

665 3 668 3

668 3 675 9

675

676

678

680

682

684

689

691

694

695

696

697

700

701

702

702

7o4

9

1

7

1

6

6

5

11

1

11

4

6

1

1

1

Il

676

678

680

682

684

689

691

694

695

696

697

700

701

702

702

704

7o6

1

7

1

6

6

5

I'

1

4

6

1

1

1

11

11

11

Material

Gray medium to fine sandstone:

Silts ton

Silty clays tone

Carbonaceous clays tone

Silty claystone

Interbodded siltstono and

claystono

COAL

Silts tone

Dark claystone

Coal, including ironstone

strcak

Coal and bono

Silty claystono

Coaly clays tone

Claystone with carbonaceous

streaks.

Bone and bony coal

Carbonaceous clays tone

Bone and bony coal

Coaly claystone

Claystono with carbonaceous

streaks

COAL

Bone

Claystone, with streaks of bone

Bony coal and bono

Thickness

Ft, in. . - b

2

1 . 6

1 0

3 0

7 6

4'

2 6

1 6

Remarks

2

2

4

2

2

1

1

2

1

4

L11

1

5)

0

11

6

2

10)

5

2

7

0

0

0)

0

7

6

Eska bed.

El., 794 ft.

Shaw bod;

el., 786 ft.

Martin bed;

el., 770 ft..

C-4-8769. tv

706 11 707 11 Bone

707 11 712 6 Clays tone

712 6 713 0 Fine sands tone

715 0 724 0 Claystone, with silty and

carbonaceous stroaks

724 0 725 6 Bone

725 6 729 0 oal,,with a few thin, bony claystone parting, mostly at the

base

729 0 732 6 Bony coal and bone

752 6 740 0 Silty clays ton

740 0 750 0 Siltstone

750 0 763 3 Silty claystone, with calcareous

and iron carbonate streaks

765 3 772 0 Fine sandstone

772 0 776 0 Silty claystone and claystone

776 0 780 0 Claystone, with carbonaceous

streaks

780 0 783 0 Silty claystone

0

6)

)

)

3 6)

3 6

7 6

LO 0

L5

8

4

3

9

0

4 0

5 0

4564 - 33 -
Log, hole 14-16

Location:

Elovation:

1,650 feet W. and 295 feet N. of center sec* 16, T. 19 N., R. 3 E;,

Seward Meridian, Eska, Alaska,

Collar of hole - 1,230 feet.

Bearing of hole:

Dip of hole: 6Co

N. 0°P W.

_ p -Ith

Frnom- ToFt. in. Ft. in. Material Ft

- - 0 0 15 0 Soil 15

15 0 16 0 Pebble conglomerate boulder 1

16 0 18 9 Buff silty claystono 2

18 9 22 3 Gray and buff medium sandstone 5

22 5 23 0 Coarse, micaceous siltstone

23 0 24 9 Dark-gray claystone, streaks of

siltstone 1

24 9 41 6 Greenish-buff coarse siltstone,

micacoous, with fine sandstone

and siltstone streaks 16

41 6 48 0 Interbeddod claystone and

siltstone 6

48 0 55 0 Fine siltstone, with thin streaks

of clays-tone 7

55 0 61 0 Interbedded siltstone and claystone 6

61 0 67 0 Claystono 6

67 0 69 2 Silty claystono 2

69 2 .85 3 Dark medium to fine siltstone 14

85 3 92 0 Fine siltstone, grading into

silty claystone 8

92 0 94 0 Claystone 2

94 0 101 6 Silts tono 7

101 6 134 0 Dark-to light-gray, coarse,

granular sandstone, with white

specks 52

154 , 0 140 0 Fin to medium to coarse sandstone 6

140 0 146 0 Intorboddod claystono, silty claystone, and siltstone 6

146 0 152 6 Medium sandstone, streaks of

siltstono at base 6

152 6 168 0 Interbeddod silts-tone and claystone 15

168 0 170 0 Slightly carbonaceous claystone 2

170 0 174 0 Gray, friable medium to coarse

sandstone 4

174 0 176 0 Dark-gray, silty claystone 2

176 0 181 6 Claystone, some coal and bone at

baso 5

181 6 183 5 Gray clay @ugeo 1

183 5 184 5 Hard, silty claystone 1

4564 - 54 -

iokness

; in

0

0

9

6

9

9

9

6

1

0

o

2

1

9

0

6

6

o

0

6

5

0

0

0

6

11

0

Remarks

Crushed.

Crushed.
Log, hole 14-16 (Cont.)

Depth

From- ToFt. in. it. in.

i 7 8 6

186 6 190 6

190 6 192 0

192 0 201 0

201 0 208 0

208 0 209 8

209 8 216 0

216 0 218 6

218 6 221 6

221 6 221 9

**

Material

Broken, dark clays tone

Claystone, some coal and gouge

Silts tone

Silty clays-tone

Clays tone

Saocharoidal sands tone

Clays tone

Sacoharoidal s.andstoneClays tone

Clays tone, with iron carbonate

cement

Clays tone

Claystone, with iron carbonate

cement

Clays tone

Claystone, siltstone, and coal

Clays tone

COAL

Dark, coaly claystone

Thickness

Ft. in.

2 1

4 0

1 6

9 o

7 0

1 8

6 4

2 6

3 o

3

16 9

Remarks

Crushed.

Shearing.

Crushed.

221 9

238 6

238 6

259 2

239

242

244

247

247

2

6

9

0

3

242

244

247

247

250

6

9

0

5

0

8

3 4

2 3

2 5

.3

2 9

Crushed.

Bottom of Bsize core.

250 0 257 0 Claystone, with iron carbonate

zones near base

257 0 276 0 Claystone, coaly zones near top

and middle

276 0 278 0 Hard, silty claystone, with iron

carbonate cement

278 0 281 2 Medium sandstone

281 2 282 1 Claystone, with thin clay bands

282 1 282 4 Silty claystone, iron carbonate

cement

282 4 285 0 Silty claystone

283 0 285 5 Clays tone

285 3 285 7 Gray clay

285 7 315 0 Claystone, locally silty, some

limy

7 0 Top of Asize core.

19 0

2

3

0

2

11

3

'8

2 3

4

29 5

* 315 0 317 6 Silty claystone, grading into

medium silts tone

517 6 519 6 Silty claystone

3319 6 334 7 Silts tone

334 7 357 0 Silty claystone, grading into

clays tone

337 0 359 11 Claystone

359 11 364 0 Medium sandstone

2

2

15

2

22

4

6

0

1

5

11

1

364 0 372 0

372

372

573

0

2

0

372

373

574

2

0

10

Claystone, grading into silty

clays tone

Grit

Clays tone

Grit

8 0

2

!O10

1 10

4564 - 55 -
Depth

- traai- [ 'T-^'

It, in. Ft. in.

371 10 -53 o

388 0 388 6

388 6 591 10

Log, hole 14-16 (Cont.)

Material

Medium to coarse sandstone

Clays tone

Coal, bone, coaly claystone

391 10 415 0 Claystone, slightly ooaly at

598 ft. 6 in.

415 0 417 7 Silty claystone

417 7 424 0 Coaly claystone

424 0 424 2 COAL

424 2 426 2 Coaly claystone

426 2 426 5 COAL

426 5 431 5 Clays tone

451 5 432 4 LTmy claystone, calcite-filled

fractures

432 4 445 3 Claystono

445 3 449 1 Silty claystone

449 1 459 1 Medium silts tone

459 1 462 5 Fine sandstone

462 5 471 0 Silty claystone and siltstone

471 0 472 10 Clays tone

472 10 473 5 Medium siltstone

473 5 47. 9 Claystone

473 9 477 4 Medium siltstone

477 4 488 10 Silty claystono, grading into

clays tone

488 10 490 9 Claystone, with abundant leaf

fragments

490 9 493 0 Silty claystono

Thickness

Ft. in.

13 2

6

3 4

23 2

2 7

6 5

2

2 0

3

5 0

11

12 11

5 10

10 0

3 4

8 7

1 10

7

4

3 7

11 6

Remarks

Shattered and

contorted.

1

2

11

3

Log, hole 15-16

Location: 2,000 feet W. and 130 feet N. of center sec. 16,

Seward Meridian, Eska, Alaska.

Elevation: Collar of hole - 1,220 feet.

Bearing of hole: N. 10C W.

Dip of hole: 600

T. 19 N., R. 5 E.,

Depth

From- ToFt. in. Ft. in. Material

0 0 2 0 Overburden, sand, gravel, silt,

with numerous boulders of

conglomerate, coarse sandstone, and siltstone

62 0 63 2 Medium to fine siltstone, with

a few coaly lenses

63 2 64 2 Claystone, with a few thin coal

lenses

64 2 68 3 Fine to medium sandstone

grading down into siltstone

4564 - 36 -

lTiclknes s

Ft. in.

62 0

1 2

1 0

4 1

Remarks
Lok -'hole 15-16 (cont.)

F oo- Depth

From- To- Thicl

Ft. in.-

-68 3

69 o

6770

3

0

84 6

92 0

95 6

99 7

100 0

' it in. Material Ft.

9 0 Clays tone and silty claystono,

with a few coaly lenses

69 3 Gray, quartz-diorito, porphyrydike rock

70 0 Dark-gray claystono

84 6 Fine to medium siltstone, with

several 6" beds of medium siltstone in lower part 14

92 0 Silty claystone, grading down

into claystone 7

95 6 Silty claystonb, with occasional

leaf impressions 3

99 7 Fine to medium siltstono 4

100 0 Silty claystone '

107 0 Claystono, with raro carbonizod

plant fraglonts, coal and bone

near' top, 'shearod at 103 ft. 7

107 5 Medium siltstone

107 9 Claystone

107 11 Medium siltstone

110 2 Claystone, grading down into silty

olaystono and siltstone 2

119 5 Fine to medium slitstone, weatherod,

minor faulting, bedding generally

normal, locally contorted 9

127 7 Claystono, silty. near middle 8

152 5 Fine to modium'siltstone,

weathered fractures 4

134 0 Silty claystone .1

kcnss

'in. Remarks '

9

3

9

6

6

6

1

5

0

5

4

2

'3

3

2

10

7

107

107

107

107

0

5

9

11

lLO 2

119 5

127. 7

132 ' '5 Crushed or

sheared.

S

4

34' 0 '157

157 9 141

141 5 142

142 7'" 179

179 0 180

180 3 188

188 0 190

9 Thin-beddod, silty claystone,

grading into siltstone 5 9

5 Medium to coarso sandstone,

dark matrix, with numerous white

specks, weathered cracks 3 8

7 Medium to coarse sandstone,

weathered dark brown 1 2

0 Medium to coarse sandstone, with

a few pebblds, dark-gray

matrix, light-oolored blotches 36 5

3 Weatherdd, brown, sticky, groundup sandstone 0ptq zone '1

0' Fine to medium sandstone, thin

carbonaceoup streaks 7 9 Dip, 20C-25°.

6 Fine silts tone, grading iinto

silty claystono 2 6 Weathered and

crushed.

- 37 -
Lo,R hole 5-16 (Cont.)

Depth __ Trom- To- Th.

Ft. in.. Ft. i ,a Material Ft

190 T ' 195 0 Fine to medium sandstone, car-,

bonaceous fragnonts, loaf

impressions, grading down

into silts tone 4

195 0 196 9 Silty claystone, leaf

impressions · 1

196 9 202 0 Oxidized, dark-gray, porous

sandstone, white specks . 5

202 0 209 0 Silty claystone and siltstone,

leaf impressions 7

209 0 209 7 Clays tone with carxbonaceous

s treaks

209 7 211 6 Silts tone, grading into medium

to coarse sandstone, friable

at base - 1

211 6 229 6 Claystone, thin coal lenses at

216 ft. 7 in. to 217 ft, 7 in.18

229 6 236 6 Silty claystone 7

236 6 243 0 Highly crushed carbonacoous

clays tone 6

243 0 244 0 Silts tone 1

244 0 245 0 Clay and sand. gugp 1

245 0 247 0 White, coarse, sugary sandstone 2

247 0 247 7 Gray claystone

247 7 248 2 White, coarso sandstone

248 2 248 9 Sandstone and claystono gouge

248 9 268 9 Clays-tone, fow local carbonaceous

streaks and coal lenses 20

Lckness

tvln. * Remarks

6

9

3

0

7 Sheared.

11

0 Sheared.at top.

0

6

0

0

0

7

7

7 Sheared.

0 Crushed and

sheared.

2 Bottom of BX

at 265 ft.

68 26811 COAL

268 11 270 0 Clays tone 1

270 0 274 3 Clay gug 4

274 3 274 7 Silty claystone

274 7 290 6 Claystone, several crushed

zones, trace of coal at

279 ft. and 290 ft.. 15

290 6 291 1 Clays tone gouge

291 1 293 11 Claystono with a few coal lonses 2

295 11 294 2 Bono

294 2 503 0 Claystone, coaly near top, geugy

from 300 to 301 ft., silty and

carbonaceous streaks at base 8

503 . - 304 11 :Soft, friable sandstone 1

304 11 319 5 Interboddod siltstone, silty

claystone, end claystone 14

319 5 519 5 Bone

1

3

4

11

7

10

3

10

11

4

2

Crushed.

Crushed.

4564 - 38 -
U

Log,_ hole, 15-16 (Cant.).

Dupth

From- To - Th:

Ft. in. Ft. in. Material Ft

319 5334 Q Claystone, silty in middle 14

334 0 561 5 Interbedded silts tone, silty

clays tono, a nd claystono 27

361 5 365 5 Fine sr:ndstono 2

363 5 364 11 Silts tono, Ygrading into arkose 1

364 11 8l 11 Coarso, massive scndstono, with

few thin clays tone stroaks 17

381 11 397 0 Arkoso, silty in midcllc, silty

claystone with few cocl fragments at base 15

597 0 599 6 Bone and some thin-bedded coal 2

icknoss

in. Roma:

7

5

0

6

0 Dip, 10°

1

6

6

6

1

rks

399

405

411

418

6

0

6

7

421 11

423 9

405

411

418

421

423

432

433

468

468

0

6

7

11

432

433

468

8

2

5

9

8

2

5

9

Clays tone

Coaly clays tone

Claystono, silty at base

Interbtdode silty claystone

and clays tone

Clays tone anld gouge

Claystone, with few coaly and

bony lenscs

Fino, silty ironstone

Coaly clays tone, silty at top

Siltstone

3

1

4

10

8 11

6

35 5

4

Crush d..

5

6

7

.

*

468 9 471 9 Silty claystono, grading into

clays tono 3

471 9 477 11 Fine-bodded siltstono, grading

into fine sandstono, carbonacoous buding 6

477 11, 501 0 Fine to medium to coarse sandstone, with a few silty bands,

shattered from 485 to 490 ft.

and 495 to 500 ft. 23

501 0 518 3 Silts tono, grading into fine

sandstone, siltstono, and

silty clays tone 17

518 3 520 1 Silty claystono grading into

silts tone 1

520 1 523 7 Sandstone, grading into siltstono, cross-bodding, 2-thin,

arkose beds at base 5

523 7 538 2 Silty claystone, with thin coaly

stroeks 14

538 2 538 7 Contorted bono, with some coal

538 7 549 7 Claystone, grading into silty

clays tone ald into claystono 11

549 7 551 8 Carbonacoous clays tono, with

abundant coal fragomnts at

top 2

3

10

6

0

2

7

5

Contorted bedding.

0

1 Crushed.,

4564 ~ 39-
Log, hole 15-16 (Cont..)

pbeth

From- ToFt. in. Pb. in.

551 8 552 7

552 7 553 3

553 3 559 2

559 2 560 1

Material

Bony coal

Thickmess

Ft. in.

11

1 8

5 11

Remarks

560

560

562

562

563

1

8

8

11

1

560

562

562

563

564

8

8

11

1

7

Bone

Coaly claystone

Siltstone, grading into fine

sands tone

Hard, calocreous clays tone

Coaly claystono, with some bone

Silts tono

Sands tone

Intorbeddod siltstono and fine

2

11

7

0

5

2

564 7 569

569 2 572

572 7 586

sands tone

2 Silty claystono, grading into

clays tone

1

4

6

7

5

7 Interboddod silty claystone,

siltstono, and fine sandstone 3

9 Gray, fractured claystone, silty

streaks, coaly near base 14

11 COAL 1

0 Irons tone

9 COAL 4

586

587

588

9

11

0

587

588

592

2

2)

1

9)

Maitland group,

Chapin bod;

el., 717 ft.;

0-51677.

592 9 594 9 Carbonacoous clays tono, with a

few coal lenses 2

594

595

599

600

600

603

604

614

617

620

620

621

621

622

623

623

639

640

643

648

4564

9

6

7

2

4

10

0

0

0

0

8

2

5

1

1

9

2

11

11

11

595

599

600

600

603

604

614

617

620

620

621

621

622

623

623

659

640

643

648

652

6

7

2

4

10

0

0

0

0

8

2

1

1

9

2

11

11

11

0

Silty ironstone

Clays tone

Coal and bone

4

0

9

1

7

2

6

2

El., 705.5 ft.,

C-52255.

0-52255.

Coaly silty ironstone

COAL

Coaly ironstone

Coal, with 2-in. coal ironstone

marker noar top and middle

Bono and coaly claystone

Silty, coaly claystone

Clays tone

Bony coal

Clays tone

Bone

Bony coal

Claystone, with few coal lenses

Coaly clays tone

Coal and bone

3

10

5

1

15

1

0 Maitland group;

C-52255.

0

0

8

6

3

8

0

8

5

9

0

0

1

David bed;

0-52995.

Coaly clays tone

Clays tone

Silty claystone

3

5

5

-40 -
Log, hole 15-16' (Cont.)

_Depth

From- Tos

Ft. in. Ft. in. Matouial

62 0 656- 0 Clas tono, with loaf fracgonts

656 0 680 6 Siltstono, with thin streaks

of silty clays tone

680 6 682 0 Intorbccisd. siltstorin and

silty clays tone

682 0 691 8 Clays tone, with loaf frasconts

and coaly stroeaks noar bottom

691 8 692 0 Bony coal

692 0 693 6 Clays tone

693 6 694 2 Bono

694 2 696 7 Coal clays tone

696 7 696 9 Irons tono

696 9 699 5 Bony coal, bone, rnil coal

Thickness

Ft. in.

-- 5

24 6 Normal bedding.

1 6

Remarks

9

1

2

2

699

699

702

703

705

704

706

706

708

708

5

7

6

3

8

6

6

7

0

5

711 0

713 6

699

702

703

705

704

706

706

708

708

711

713

722

726

729

736

737

740

749

751

722

723

726

729

0

2

5

8

7 Silty clays tono

6 Bone, bony co-l, and coal 2

3 Coal;y clays -to1n

8 Coal :and bceno

6 Cle.y; non , coaoly at top and

bo t toiil

6 Coal cai bony coal 2

7 Siltl clays tone

0 Coal anil ,ony coal 1

3 Silts tone

0 Sandstone, with thin coca

s treoks 2

6 Silty clays tono 2

0 Fino salds tone, gradingl into

silts tono 8

2 Silty clays tone 1

5 Claystono, silty at basc 3

8 Siltstone, with calcite voinlot 3

2 Intorbcd.dodl silty claystono,

siltstono, and fine sandstone,

few leaf impressions 6

0 Fino sa rds tono

6 Clays tono, with niumrous leaf

im.pr ss ions 3

6 Silts tonc, with limy oonmnt 9

8 Mottled fine sandstone, with

stroaks of siltstone and carbonizod planut frapents 2

3 Claystono, silty top and bottom,

limy at 752 ft. 7 in. 14

0 Lilgt gray to buff limestone 1

- 41 -

8

4

6

8

5

2

8

2

11

9

5

10

0

1

5

9

6

6

2

3

Emory or No. 8

bed; ol.,

616.7 ft.,

0-52396.

Normal bedding.

736 2

737 0

740 6

749 6

6

10

6

0

751 8 766

766 5 768

4564

2

7

9
Log, holo 15-16 (Cont.)

Dopth From- To- T

Ft. in. Ft. in. Matorial F

768 0 772 0 Silty and denso olaystone,

probably linay

772 0 773 0 Silty claystone, limo cnment

775 0 778 0 Claystonc, streaks of siltstone,

nutorous plant fracionts

778 0 779 0 Liuy claystone with calcito

voinlots

779 0 781 5 Donso claystone, with siltstone

s treaks

781 5 790 0 Finu scndstono, with silty bands

and thin bands of clays tone

and loaf fragsonts, crossboedding

790 0 798 0 Claystone, with thin limy and

silty claystone bands

798 0 798 6 Derk-brown, shaly claystone

798 6 805 0 Dark-brown, shaly claystone, with

a fow piocos of coal

Bodding angl os

hicknoss

't. jn.

4 0

1 0

5 0

1 0

2 5

8 7

8 0

6

6 6

Romarks

Crushed.

Depth,

feet

70

95

.105

119

125

185

243

370

415

477

500

675

725

Dogres

90

90

80

90o

80-85

80-85

50

70

75

90

80

90

90

Di-o

dD=,O-"~

30

30

20

3o

20-25

20-25

10

10

15

50

20

30

30 o

4564 - 42 -
tLo, hole 1-15 EA

Location: 780 feet S. and 10 feet E. of NW. corner sec. 15, T. 19 N.,

R. 3 E., Seward Meridian, Eska, Alaska.

ELevation; Collar of hole - 1,031 feet.

fDepth

From- To,

Ft. in. Ft. in. Material

0 06 0 Overburden, soil, sand,

clay, scattered boulders

and gravel

36 0 40 6 Silts tone and fine

sands tone

40 6 45 6 Silty claystone

45 6 46 0 Fine sandstone

46 0 48 6 Silty clays tone with streaks

o f sands tone

48 6 49 3 Sandstone

49 5 52 0 Silty clays tone

52 0 57 6 Claystone

57 6 61 o Interbedded clays tone and

siltstone

61 0 61 9 Clays tone

61 9 64 5 COAL

64 3 64 9 Bone

64 9 65 3 Coal; c lays tone

65 3 70 9 Clays tone, with streaks of clay

and coal

70 9 71 5 Bone

71 5 72 5 Claystone

72 5 74 5 COAL

74 5 74 7 Clays tone and bone

74 7 77 0 Claystone and coaly claystone

77 0 93 0 Claystono, with plant fossils,

thin, silty streaks

95 0 100 0 Interbedded and. cross-bedded

siltstone and claystone

100 0 106 2 Clays tone

106 2 106 6 Clay, with streaks of coaly

clays tone

106 6 107 0 COAL

107 0 109 0 Bony coal

109 0 109 6 Coaly clays tone

109 6 109 10 Sands tone

109 10 110 6 Silty claystone, with coaly

blebs

110 6 111 0 Coaly clays tone

111 0 115 0 Clays tone

Thickness

Ft. in.

36 0

Remarks

4

5

6

0

6

2 6

9

2 9

5 6

5 6

9

2 6

6

6

5 6

8

1 0

2 0

2

2 5

Dip, 100

Dip, 100

Maitland bed;

el., 969.2 ft.;

C-77879.

a

16 0

0

2

a 7

6

4

6)

2 0)

6

4

8

6

4 0

David bed;

el., 924 .5 ft.

- 43 -
Dupth -

From- To bFt. in . Ft. in.

115 0 128 0

128

131

153

134

154

136

139

151

152

155

0

6

-o

0

6

6

6

6

0

6

151

153

134

154

136

139

151

152

153

157

6

0

0

6

6

6

6

o

6

o

Log, hole 1-15 4. (Cont.)

Material

Cross-bedded siltstone with

thin streaks of claystone

Silty clays tone

'Silts tone

Silty clays tone

Silts tone

Coaly clays tone

Silts tone

Clays tone

Clay

Bone and coaly claystone

COAL

15

3

1

1

2

3

12

1

3

2

12

61

1

0

6

6

0

6

o

0

0

6

6

6

5

7

0

0

0

0

Thickness

Ft. in. Remarks

Dip, 50

Emery bed;

el., 877.5 ft.

0-77880.

157 0 157 5 Clay

157 5 158 0 Silts tone

158 0 160 0 Clays tone

160 0 172 0 Massive, fine sandstone

172 0 233 0 Massive sandstone

235 0 24 0 Clays tone

234 0 234 6 Claystone, with streaks of

coaly claystone

234 6 234 10 Claystone

254 10 236 6 Coaly claystone, 1/4-inch

streaks of coal

256 6 258 7 Carbonaceous claystone, thin

streaks of coal

238 7 240 7 Gray claystone, with a few

distorted coal streaks

240 7 241 0 Claystone, with streaks of

coaly clays tone

241 0 242 2 Gray claystone

242 2 243 2 Silts tone

243 2 243 4 Coal with calcite streaks

243 4 245 3 Thin-bedded, fine sandstone

and silts tone

245 5 246 1 Gray claystone

246 1 254 7 Whitish, bontonitic claystone

254 7 256 2 Gray clays ton

256 2 256 4 Coaly claystone

256 4 256 10 Bone

256 10 257 5 Coaly claystono

257 5 261 11 Gray clays tone

261 11 265 0 Carbonaceous claystone, with

few coaly streaks

265 0 265 5 Coal and coaly claystone

265 5 267 2 Gray claystone

6

4

1 8 Dip, 5 - 10 .

2 1

2 0

1

1

2

0

2

1 11

10

8 6

1 7

2

6

7

4 6

1

2

1

1

5

9

4564 - 44 -
Lo, hole 1-15 m (Cont.)

Dtpth

From- ToPt. in. Ft. in.

27 2 29 0

269 0 269 5

269 5 272 4

272 4 274 5

274 3 276 3

276

294

294

296

297

298

298.

299

3

0o

6

0

10

0

10

0

294

294

296

297

298

298 -

299

500

0

6

0

10

0

10

0

4

Matorial

Fine gray s ilts tone

Gray claystone

Gray silts tone

Silty claystone

Fine siltstone, with contorted, coaly stringers

Gray claystone

Silts tone

Gray claystone

Clays tone, with streaks of

coaly claystone

Silts tone

Bono

Silts tone

Coal, 1-1/2-inch streak of

bone

Thickness

Ft; in.

1' ' 10

5

2 11

1 11

Remarks

2

17

1

,0

9

6

6

1 10

2

10

2

1 4 Bed 9a;

0-77881.

300 4 302 2 Claystone, streaks of coaly

clays tone

302 '2 304 2 Coaly claystono, streaks of

clays tone

304 2 305 6 COAL

305 6 508 3 Clays tone, thin streaks and

blebs of coal

308 5 308 8 Coaly clays tone

508 8 309 6 Silty clays tone

309 6 510 4 Cross-bedded, coaly olaystone

310 4 513 9 Clays tone

315 9 314 0 Coaly claystone

314 0 314 8 Clays tone

314 8 325 10 Claystone, streaks and blobs of

coal

523 10 524 0 COAL

524 0 324 1 Cross-bedded claystone

524 1 324 5 Bone

524 3 524 10 Clayston, streaks of coaly

clays tone

324 10 326 6 Silts tone

526 6 327 3 Silty claystone

27 5 5331 6 Silts tone

331 6 333 0 Dark claystono, with coal

fragocnts

333 0 540 0 Claystono

540 0 341 0 Siltstone

541 0 550 0 Interbodded siltstone and

silty clays tone

1 10

2

1

2

3

0

4

9

5

10,

10

5

5

8

2

2

1

2

Bod 9b;

0-77882.

Dip, ° 9 0 - 200.

1

4

1

7

1

9

7

8

9

3

6

0

4564 - 45 -
Log, hole 1-15 EA (Cont.)

Depth

Fzom- ToFt. in. Ft. i. Material

350 0 356 6 Silts tono

356 6 378 2 Massivo, fine sandstone

378 2 578 4 COAL

378 4 379 2 Fino sandstone, with blobs

of coal

379 2 402 0 Massive, speckled, coarse

sands tone

402 0 403 3 Silts tone

403 5 412 3 Fine sandstone

412 3 440 0 Medium sandstone

440 0 447 0 Dark claystone

447 0 447 6 Coal and coaly claystone

447 6 448 0 Clays tone

448 0 491 8 Intorbcddod and orossbeddod

fine sandstono, siltstone,

and silty clays tone

491 8 492 0 Siltstone, with leaf

impress ions

492 0 492 4 Bone

492 4. 494 3 oAL

494 3 494 6 Bone

494 6 495 6 Coal, with 1-inch streak of

bone

495 6 496 8 Bone, with thin, coal streaks

496 8 497 3 COAL

497 3 497 5 Clays tone

497 5 498 4 COAL

498 4 498 8 Bone

498 8 501 4 Bone, ooaly claystono, and coal

501 4 502 0 Oarbonccoous clays tono

502 0 502 8 Bono

502 8 502 10 Silts tone

502 10 503 4 Clays tone

505 4 504 0 Siltstono and silty claystono

504 0 510 0 Fine sandstone, with thin,

carbonaceous streaks

510 0 513 0 Silty clays tone

513 0 526 0 Fine sandstone, with thin,

carbonaccous stroaks

Thickness

Ft. in.

-2 - - 21 8

2

Remarks

22

1

9

27

7

10

10

3

0

9

0

6

6

43 8 Dip, io°-200;

0&od roof.

4

4)

1 11)

5) 3

1 o)

1 2

7

2

11

4

2 8

8

8

2

6

8

Eska bed;

dip, 0°-10°;

el,, 539.0

ft.; C-78005.

6

35

153

2

2

0

0

526 o

529 o

551 2

531 7

532 2

532 6

532 7-1/2

555 1-1/2

553 3

4564

529

551

551

532

532

552

555

53355

55)

0

2

7

2

6

7-1/2

1-1/2

-1/2 4-1/2

Silts tone

Claystono

Coaly claystonc end coal

Carbonaceous claystonc,

streaks of bone

COAL

Bone

COAL

Bony coal and sandstone

COAL

- 46 -

0 Dip, 305.

o Dip, 200.

2

5

7

4) Shaw bed;

1-1/2 el., 498.9 ft.;

6) 0-78029.

1-1/2

1-1/2)

---
Log, holo 1-15 EA. (Cont.)

.

IDe 

Cc .

ttlh ..

From- To- - ., . ; . .

Ft.

533

535

534

534

in.

4-1 /2

6-1/2

4

5

$t.

535

554

554

55

in.

4

5

9

Material

Thickness

Ft. in.

2

9-1/2

Remarks

Bone

COAL

Bone

COAL

1

1 4

1 0

) 555 9 536 9 Bone, with thin streaks

of coal

556 9 537 9 Carbonaceous claystone2 with

thin streaks o&' coal

537 9 559 5-1/2 Bony coal

539 5-1/2 539 8 COAL

1

1

0

8-1/2

2-1/2

539

559

540

541

545

543

544

544

548

551

8

9

10

6

6

10

2

6

0

0

o

o

539

540

541

543

545

544

9

10

6

6

10

2

Bono

COAL

Bony coal

COAL

Bone

Carbonaceous clays tone

1

1 1

8

2 0

4

4

) 0-78050.

)

)

544. 6 Bone

548 0 Siltstone

551 0 Silty clays tone

558 0 Claystone, with streaks of

silty clays-tono

558 11 Carbon aeous claystone, with

thin coal streaks

5

5

4

6

0

7 0

558 0

558 11

559 0

560 2

560 4

11

559 0 1

560 2

560 4

561 2

561

562

562

562

563 565

565

564

565

566

566

568

2

4-1/2

6

8

6

10

4

4

8

1

4

1

562

562

562

563

565

564

565

565

566

566

568

568

4-1/2

6

8

6

10

4

4

8

1

4

1

4

Silts tone

Coaly claystone, with streaks

of coal and bone

Silts tone

Ooaly claystone, with streaks

of coal and bone

COAL

Bono

Silty, coaly claystone

COAL

Coaly clays tone

COAL

Coaly claystone, with streaks

of coal

Bono

COAL

Coaly claystone

COAL

Bony coal, with streaks of

silts tone

Coaly clays tono

Bony coal

1 2

2

10

1 2-1/2)

1-1/2

2

10 )

4

6 )

1 0

4

5 )

9 1 9 )

Poor roof.

Martin bed;

el. ,469.9

ft.;

0-78095.

0-78096.

568 4

568 7

568 7

569 0

3

5

5

4564 - 47 -
Log, hole 1-15 EF (Cont.)

,Deth

From- To- , , ,

Ft.

569

570

571

571

571

572

572

in.

0

6

0

6

9

o

3

Ft. in. Material

570 6 Coaly claystone

571 0 COAL

571 6 Bone

571 9 Carbonaceous claystone

572 0 Carbonaceous silts tone

572 3 COAL

575 9 Claystone, with streaks of

coaly claystone

576 0 COAL

580 0 Claystone, with thin streaks

and blebs of coal

582 0 Siltstone, with mottled

irons tone

587 0 Silty claystone

589 0 Fine sandstone

593 0 Silty claystone

Thickness

Ft. in.

o

6

6

3 5 '

3

3

Remarks

575 9

576 o

3 6

3

4 0 Dp, 20 ° .

580

582

587

589

0

0

0

0

2

5

2

4

0

0

0

0

Location: 915 feet

Seward

Log, hole 2-15 FA

S. and 715 feet E. of NW. corner sec. 15, T. 19 N., R. 3 E.,

Meridian, Eska, Alaska.

? Elevation: Collar of hole - 1,058.8 feet.

Depth

From- To-

-

Ft. in. Ft. in. Material

0 0 - 0 Overburden, soil, sand,

granite boulders, and

decomposed siltstone

49 0 66 0 Medium speckled sandstone

66 0 70 0 Dark claystone, with thin

coal streaks and carbonized

fragments

70 0 71 6 Gray clays tone

71 6 76 6 Fine sandstone, with thin

streaks of silty claystone

76 6 76 9 Hard, calcareous siltstone

76 9 78 0 Silty claystono

78 0 85 0 White, bontonitic claystone

85 0 87 0 Siltstone, with very thin

carbonaceous streaks

87 0 89 0 Dark claystono, with streaks

of coaly claystone

89 0 89 6 Clay

89 6 89 8 COAL

89 8 90 0 Brown, silty claystone with

1/4-inch streak of clay

90 0 91 0 Coaly claystone

91 0 102 0 Interbedded and crossbedded

fine sandstone and silts tone

102 0 104 0 Claystono, with streaks of

coaly claystong8 and coal _54 4

Thickness

Ft. in. Remarks

49

17

0

0

4 0

1 6

5 0

5

7 0

2 0

2 0

6

2

4

1 0

11 0

I 2 0 Bod 9.
Log, hole 2-15 EA (Cont.r

_ Depth_

roi- ,To- , jt. in. Ft. in. Material

15 0 1-09 0 Silty claystono

l09 0 114 0 Siltstone, with crossbedding at base

l14 0 118 6 Claystone, with a few

carbonized streaks

118 6 122 0 Silts tone

122 0 128 0 Dark'claystone, with gray,

slickensided claystone end

LougQ at 125 ft.

128 0 129 0 Silts tone

129 0 151 0 Gray claystone

131 0 157 0 Dark-gray, silty claystone

with thin, black, coaly

streaks

Thickness

Ft. in.

5 0

Remarks

5 0

4

6

1

2

6

6

0

0

0 Slickensided.

26 0 Dips:

152

139

14l

15o

ft. -450

ft.-500

ft.-55°

ft.-25°

157

160

181

200

0

0

0

0

160

181

200

201

0

0

0

0

201 0

204 0

228 6

229 4

204 0

228 6

229 4

250 2

250

255

238

259

239

246

256

271

272

275

275

276

276

4564

2

.0

0

2

6

0

0

6

0

0

5

0

9g

2355

238

259

259

246

256

271

272

275

275

276

Silty claystone 3

Silts tone 21

Massive,fine,silty sandstone 19

Coarse, speckled sandstone

contorted at base 1

Fine to iedlum sandstone 5

Massive, coarse, speckled

sandstone, with slickensidos

at 205 ft. 24

Fine sandstone

Coarse, contorted sandstone,

with fine sandstone lenses

and carbonized fragments

Fine sandstone 4

Clays tone 3

Silty clays tone 1

Irons tone

Silty claystone 6

Silts tone and fine sandstone 10

Interbedded and crossbedded,

fine sandstone and siltstone 15

Dark clays tonu

Silty claystone 3

Dork claystone

COAL

0

0

2

6

0

0

6

0

0

3

0

0

0

0

0

0

6

10

10

10

0

2

4

6

0

6

6

0

3

9

Slickensided.

Dip, 20 ° .

Good roof.

Eska bed; el.,

763.6 ft.;

0-78692.

0-86312.

C-78692.

276 9

277 6

Bone

COAL

0

9
Log. hole 2-15 EA (Cont.)

Depth

From- ToFt. in. Ft. in. Material

277 6 278 6 Bony coal

278 6 279 6 COAL

279 6 281 6 Coaly claystone, with streaks

of coal and clay

281 6 285 9 Carbonaceous clays tone, with

streaks of coaly olaystone

285 9 287 0 Bony coal

287 0 295 0 Dark claystone, with irregular

bedding

295 0 297 0 Interbedded, silty claystone

and silts tone

297 0 500 0 Interbedded siltstone and fine

sands tone

300 0 301 0 Silty claystone

301 0 505 10 Dark gray claystone

505 10 306 4 Dark claystone, with thin

streaks of coal and. coaly

clays tone

306 4 o06 8 Bone

306 8 307 6 coAL

307 6 308 0 Bony coal

308 0 308 1 Bone

308 1 509 2 OOAL

509 2 310 10 Bony coal

310 10 311 0 Bone

311 0 311 4 COAL

311 4 511 6 Bone

311 6 512 0 COAL

512 0 513 0 Bony coal

315 0 514 0 Coaly claystono, with streaks

of bone

314 0 515 0 COAL

315 o 315 3 Bone

315 5 317 6 COAL

317 6 317 7 Irons tone no dule

317 7 317 8 Bony coal

317 8 317 10 Ironstone

517 10 518 2 Bony coal

318 2 318 6 Siltstone, with bony streaks

318 6 519 4 COAL

319 4 319 8 Coaly claystone

319 8 320 3 Bony coal, with streaks of

coaly claystone

320 3 321 0 Coaly claystone

321 0 332 0 Siltstone

332 0 334 O Gray claystone

334 0 335 0 Hard, silicifiod siltstone

335 0 344 6 Silty claystone

Thickness

Ft. in.

1 0

1 0

2 0

Remarks

C-86313.

C-78692.

4

1

3

3

8 0 Dip, 200.

2 0

3

1

4

0

0

10

6

4

10)

6)

1

1 1)

1 8)

2

4)

2

6

i 0

Dip, 200.

Shaw bed,

el,732.5 ft.

C-78695.

1 0

1 o) C-78694.

3

2 3) C-78695.

1

1

2

4

4

10)

4

11

2

1

9

7

9

0o

0

0

6 Dip, 30°-40°.

4564 - 50 -
349 7 550 4 Silty, coaly claystone, with

streaks of bone

350 4 350 8 Bone

350 8 351 8 Gray claystone 1

351 8 352 2 Bone

352 2 352 8 Silty, coaly claystone

352 8 353 3 Claystone, with streaks of bone

355 3 354 0 Bone

554 0 3555 1 Silty claystone, with streaks of

bone 1

355 1 357 3 Bone, with streaks of coal 2

357 3 365 0 Gray claystone, with scattered

coal streaks 7

565 0 365 6 Irons tone

565 6 371 0 Silty clays tone 5

371 0 372 0 Fine sandstone 1

372 0 576 0 Silty claystone 4

376 0 576 8 Coaly claystone

376 8 377 0 Silty claystone

377 0 377 8 COAL

577 8 578 2 Coaly clays tone

378 2 380 6 Claystone, with streaks of coaly

claystone 2

380 6 381 0 Irons tone

381 0 387 0 Dark, silty claystone, with blebs

of carbonized plant fragments 6

587 0 392 0 Siltstone, with thin streaks

of silty claystone 5

392 0 397 0 Claystone, with streaks and blebs

of coal , 5

397 0 407 0 Siltstone, with 1-ft. calcareous

streak at 405 ft. 10

Log, hole 2-15 EA (Oont.)

)Depth

From- ToFt. in. Ft. in. Material

3-44 5345 T~ Coaly, silty claystone, with

streaks of bone

345 6 346 4 Tan, calcareous siltstone,

with streaks of bone

346 4 347 10 Coaly claystone, with streaks

of bone

347 10 349 7 Coal, with a few dull streaks

Thickness

Ft. in.

1 0

10

Remarks

1

1

6

9 Martin bed;

el., 691 ft.;

dp, 200,

C-78696.

Slicknes ided.

9

4

0

6

6

7

9

ft

No water or gas in the nole.

4564 - 51 -
Log. hole 3-15 FA

Location: 70 feet S. and 640 feet E. of NW. corner, sec. 15, T. 19 N,,

R. 3 E., Seward Meridian, Eska, Alaska.

Elevation: Collar of hole - 1,075 feot.

TDepth ,, , ,, -, -

From-- rToFt. in. Ft. in. Material

0 0 58 0 Overburden, soil, glacial

drift, boulders, sand,

clay, and gravel

58 0 40 0 Fine sands tone

40 0 41 0 Silty olaystone

41 2 0 Interbodded siltstone and fine

s ands tone

52 0 55 0 Claystone, with streaks of

coaly clays tone

55 0 57 0 Intorbedded siltstono and fine

sandstone

57 0 68 0 Silty olaystone

68 0 69 0 Fine sandstone

69 0 84 0 Speckled medium sandstone, with

carbonized plant fragnonts

and. blobs of coal

84 0 85 0 Dark claystone, with leaf

impress ions

85 0 91 0 Dark claystone, with streaks

of coaly claystone

91 0 95 5 Bony coal, with streaks of coal

Thickness

Ft. in. Remarks

38

2

1

0

0

0

11 0

5 0 Dip, 30°.

2

11

1

0

0

0

15 0

1 0

6

2

0

5

Dip, 35.

rhory; ol.,

984 ft.

93 3 96 3 Contorted, hard, silty ironstone,

with streaks and blebs of coal 5

96 3 97 1 Bony coal

97 1 97 9 Silty claystono

97 9 97 11 Bone

97 11 102 0 Silty claystone 4

102 0 116 0 Fine sandstone 14

316 0 132 0 Intorbodded siltstone and fine

Sandstone, with irregular

banding and ironstone near

top 16

132 0 151 0 Massive medium to coarso

speckled sandstone 19

151 0 165 0 Intorboddod gray siltstone and

silty claystone, with occasional carbonized plant fragnents 14

165 0 168 6 Contorted, dark claystone, with

streaks of coaly claystone 3

168 6 170 0 Siltstono, with thin, irrogular,

carbonized bands 1

0

10

8

2

1

0

0

0 Granite.

0

6 Dip, 30P.

6

4564 - 52 -
Log, hole 5-15 EA (Cont.)

From- ToFt. in. Ft. in. Material

17 0 176 -~ Intorbeddod siltstone and

silty claystono

176 6 182 10 White, bcntonitio claystono

182 10 183 0 Limestone, with calcite voinlots and sulfidos of iron

183 0 184 0 Silts tone

184 0 185 6 Silty claystono

185 6 187 0 Dark claystono, with stroaks of

ooaly clays tone

187 0 188 0 Yellow, bentonitic clay and

0goue

188 0 189 6 Dark claystono, with streaks of

coaly claystone

189 6 195 6 Silty claystono, with interbedde d sandstone

193 6 194 0 Calcareous siltstono

194 0 197 6 Claystone, with streaks of coaly

clays tone

Thickness

Ft. in. Rcmarks

6 Bontonitic.

6

1

1

6

4

2

0

6

1 6 Slickensidod.

1 0

1 6

4 0

6

I- 197 6 199 0 Silty clays tone

199 0 202 0 Siltstonc

202 0 211 0 Fine sandstono, with calcite

voinlets at base

211 0 215 0 Dark olaystono, with carbonized

plant fragennts

215 0 239 0 Silty claystone and siltstono

239 0 244 0 Dark claystono

244 0 250 6 Siity claystone, with coaly

claystono, ironstono, and

clay streaks

250 6 251 0 Coaly claystone, with strorks

of coal

251 0 252 0 Dark clays tone

252 0 252 2 Bony coal

3 6

1 6

3 0

9 0

Dip, 20°-25°.

2

26

5

0

0

0

6 6

252

252

252

255

254

256

256

258

259

259

260

262

2

4

7

6

0

0

2

6

6

6

0

o

252

252

255

254

256

256

258

259

259

260

262

549

4

7

6

0

0

2

6

0

6

0

0

0

COAL

Ironstone lenses and coal streaks

COAL

Irons tone

Coaly claystone, with streaks of

bone

Bone and claystone

COAL

Clays tone

Fine sandstone

Coaly clays tone

Silty, bontonitic claystone

Massive fine sandstone, with

occasional ironstone and

bontonitic bands 8'

6

1 0

2

2

5

11

6

2

2 4

6

6

6

2 0

7 0

Bed 9; ol.,

825 ft.

c-80437.
LoR, hole 3-15 EA (Cont.)

Depth

From- ToFt. in. Ft, in. Material

3E- 0 550 ~- Contorted medium and coarse

sandstone

350 6 357 0 Contorted medium and fine

sandstone

357 0 427 0 Massive, speckled, coarse sandstone, occasional carbonized

streaks and blebs

Thickness

Ft. in.

1 6

,6 6

Remarks

70 0 Dip, 30° at 386

ft. and 420 ft.

427 0 436 0 Cross-bedded fine to medium

sandstone 9

436 0 437 0 Silty clays tone 1

437 0 438 0 Irons tone 1

438 0 442 7 Claystone 4

442 7 443 0 Coal, with calcite and pyrite

veinlets

443 0 444 0 Tan, contorted ironstone, with

calcite veinlets and

carbonized bands 1

444 0 446 0 Coaly, shaly claystone, with

calcite specks 2

446 0 452 0 Massive medium sandstone, with

contorted banding 6

452 0 481 0 Cross-bedded and interbedded

fine sandstone, siltstone, and

silty clays tone 29

481 0 486 0 Dark, shaly claystone, with

ironstone nodule 5

486 6 486 6 Ironstone

486 6 490 0 Dark, shaly claystone, wita

ironstone nodules 5

490 0 493 0 Interbedded gray sandstone

and dark claystone 3

493 0 516 0 Fine to medium sandstone, with

wavy, carbonized plant fragments and occasional ironstone

bands 23

516 0 518 1 Dark claystone, with thin

streaks of coaly claystone 2

518 1 518 2 Bone

518 2 519 10 COAL 1

519 10 520 1 Bone

520 1 521 2 Coal with 1/2-in. bone streak 1

521 2 521 4 Bone

521 4 521 7 COAL

521 7 522 2 Bone, with claystone streaks

522 2 525 4 Bony coal, with thin streaks of

coaly clays tone 1

0

0

0

7

5

0

0

0

0

0

6

Dip, 20 ° .

ip, 150.

6 Dip, 1° .

0 Dip, 20°.

0 Di, 17°.

1 Dip, 200.

1 Eska bed; el.,

8) 557 ft.

3

1) C-80438.

2

5

7

2

4564 - 54 -
Log, hole 5-15 fEf (Cont.)

To- Thi

v

Ft. in. Ft. in. Material Ft.

523 4 523 9 Coaly claystone

523 9 524 3 COAL

524 3 525 5 Bony coal, with thin streaks

of coal 1

525 5 534 3 Goaly claystone and siltstone,

with 1/2-in. streaks of coal

and bone 8

534 5 534 9 Coal and bone

534 9 538 0 Dark claystone, with occasional

streaks of coaly olaystone 3

538 0 - 558 6 Ironstone, with calcite veinlets

538 6 542 0 Dark claystone, with sandy streaks

and tan, circular, and wavy,

calcareous markings 3

542 0 551 0 Interbedded fine sandstone'and

dark siltstone 9

551 0 558 9 Dark claystone, with thin

streaks of ironstone and coal 7

.ckness -

in.

5

6

2

10

6

3

6

6

0o

9 Watercourse at

557 ft. 6 in.

5

Remarks

558

559

9

0

559 0

561 9

Irons tone

Dull coal, with thin streaks of

bone

561 9 563 6 Coaly claystone, with streaks of

bone

563

563

563

564

565

567

567

568

568

568

568

570

570

570

572

6

7

10

0o

0

6

9

0o

6

8

9

2-1/2

4

5

0

*ft

563 7

563 10

564 o

565 o0

567 6

567 9

568 0

568 6

568 8

568 9

570 2-1/2

570 4

570 5

572 0

572 6

575 3

575 6

588 6

Bone

COAL

Bone

COAL

Carbonaceous claystone, with

thin streaks of coal

Coaly claystone

Irons tone and bone

Bone

Irons tone

Bone

COAL

Bone

Irons tone

COAL

Ironstone, with streaks of

bone and pyrite

Bone, with calcite streaks

Coaly clays tone

Dark-gray, silty claystone

2 9 Shaw bed;

el., 524 ft.;

0-85550.

1 :9 Dip, 15.

1

3) 0-80491.

2

1 O) -

2 6

3

3

6

2

1

1 5-1/2) C-80492.

1-1/2

1

1 7)

572 6

573 5

575 6

6

9

3

15 0

4564 - 55 -
Log, hole 5-15 sr (Cont,)

Depth

From-- To-,

Ft.

588

589

590

In.

6-

0

0

't.

590

591

in,

0

0

0

a

Material

Irons tone

CarbonaoeouS clays tone

Bony coal

Thickness -

Ft. in. Remarks

- r

1 0

1 0 Martin bed;

el., 485 ft.

1 1 Dip, 15p.

591 0 592 1 Carbonaceous claystone, with

thin streaks of bone

592 1 594 8 Coal, with a few thin streaks

of bone

594 8 595 0 Ironstone

595 0 595 8 Carbonaceous claystone595 8 597 10 COAL

597 10 599 0 Carbonaceous clays tone

2 7 c-85551.

4

8

2 . 2 C-80495.

1 2 Dip, 15°

4

1 4

3

8.

2

a

599

599

6oo

600

601.

6ol

o

4

8

11

7

9

599

6oo 600

601

601

602

4

8

11

7

9

1

Irons tone

Coal, with streaks of bone..

Carbonaceous clays tone

Coal, with strea:s of bone

CarbonaCeous sandstone

Bony coal, with streaks of

carbonaceous claystone

Carbonaceous clays tone

Gray claystone

602 1

602 7

602 7

604 0

4

6.

1 5

Log, hole 4-15 EA

Location:

Elevation;

405 feet S. and 1,250 feet E. of NW. corner,

R. 5 E., Seward Meridian, Eska, Alaska.,

Collar of hole - 1,064 foot.

sec. 15, T. 19 N.,

Depth

From- ToFt. in, Ft. in.

0 0 10 0

10

18

20

22

22

22

25

23

24

26

26

28

29

0

0

0

35

5-1/2

2-1/2

3-1/2

10

0

6

6

2

18

20

22

22

22

23

23

24

26

26

28

29

29

0

0

3

5

5-1/2

2-1

8

0

6

6

2

8

Material .

Overburden, soil, sand,. and

gravel

Medium speckled sandstone

Silts tone

Silty, shaly claystone

COAL

Bone

COAL

Bone

COAL

Bony coal

Coaly clays tone

Siltstone

Bony coal

Coaly claystono

Thickness

Ft. in.

10 0

8 0

2 0 D

2 5

2) E

I

1/2

9)

1

1 6-1/2)

.1 2

6

2 0

8

6

Remarks

Ip, 15°-20P.

nery bed; el.,

1,041.8 ft.; C-83519.

4564 - 56 -
Log, hole 4-15 EA (Oont.)

Deopth

From- ToFt. in. Ft. in. Material

29 - 32 0 Coal, with one thin streak

of bone

32 0 32 2 Irons tono

32 2 34 6 Carbonaceous clays tone

34 6 37 0 Gray claystone

37 0 37 3 Coaly claystone

37 3 38 0 Bony coal

38 0 38 6 Claystone

38 6 41 0 Coaly clays tone

41 0 42 0 Gray claystone

42 0 44 0 Bony coal, with streaks of coal

44 0 45 8 Carbonaceous claystono and

s ilts tone

45 8 46 5 Coaly claystone

46 5 47 5 Bone, with streaks of coaly

clays tone

47 5 48 5 Carbonaceous siltstone and

clays tone

48 5 49 5 Coaly claystone, with streaks

of bone

49 5 50 5 Bone

50 5 57 0 Interbodded siltstone and. sandstone

57 0 64 0 Silty clays tone

64 0 96 5 Intorbodded sandstone, siltstone, and silty, bentonitic

clays tone

96 5 98 o Bony coal

98 0 98 4 Ironstone, with pyrite veinlets

98 4 99 9 Bony coal

99 9 102 0 Siltstone, with streaks of clay

102 0 103 0 Ironstono, with calcite

voinlots

103 0 116 0 Interbodded fine sandstone and

dark, silty claystono, with

blebs of coal

116 0 117 0 Ironstone

117 0 119 0 Medium sandstone, with wavy,

thin, dark bands

119 0 119 4 Bony coal

119 4 124 0 Dark, silty claystono

124 0 132 0 Fine sandstone, with carbonized

plant fragnonts

132 0 140 0 Claystone, with occasional

2-in. -ironstone bands

140 0 142 0 Sandstone

142 0 144 0 Clays tone

Thiclmness

Ft. in.

2 4

2

2 4

2 6

3

9

6

2 6

1 0

2 0

Remarks

0-83520.

Dip, 200.

Dip, 30° .

1 8

9

1 0

1 0

1

1

6

7

0

0

7

0

5

7

4

5

53

Dip, 25P.

Dip, 30°.

Dip, 30°.

52 fDi, 35°.

1

1

2

1 0

13

1

0

0

2 0

4

4 8

8 0

8 0

2 0

2 0

Dip, 00-150.

4564 - 57 -
Log, bole 4-15 E (Cont.)

, De pth

rcom- ToFt. in. Ft. in. Material

144 0 147 0 Fine sandstone

147 0 147 10 Ironstone and bone

147 10 152 6 Dark claystone

152 6 154 0 Silts tone

154 0 174 0 Claystone and silty clays tone

174 0 174 6 Ironstone

174 6 176 0 Dark claystone

176 0 178 0 Coaly clays tone

178 0 178 2 Ironstone

178 2 178 4 Coaly clays tone

178 4 179 0 Bony coal

179 0 179 2 Ironstone and coal

179 2 182 0 Bony coal and coal

182 0 182 10 Ironstone and coal

182 10 184 6 Coal and bone

184 6 184 10 Ironstone

184 10 188 0 Sandstone

188 0 188 3 Coaly claystone

188 5 188 6 Brownish claystone

188 6 189 O Gray claystone with few coaly

s tre aks

189 0 18 53 Gray ironstone

189 3 '19.4 0 Gray claystone, with few

coaly streaks

194 0 195 0 Silty claystone

195 0 199 0 Silts tone

199 0 200 0 Fine sanldstone

200 0 200 6 Clayey siltstone

200 6 203 0 Gray siltstone

203 0 209 0 Silty claystone, few coal

lenses and streaks

209 0 210 0 Ironstone, with calcite

veinlets

210 0 210 9 Silty claystone

210 9 211 0 Ironstone

211 0 212 6 Silty clays tone

212 6 215 0 Irons tone

213 0 216 0 Siltstone

216 0 219 0 Silty clays tone

219 0 228 0 Siltstone

228 0 268 0 Fine to medium sandstone,

with few thin, bentonitic

streaks

268 0 339 0 Coarse, light-gray sandstone,

speckled with biotite

339 0 349 0 Dark claystone, with carbonized

plant fragpents

4-64 58

Thickness'..

Ft. in:.

3 0

10

4 8

1 6

20 0

6

1 6

2 0

2

2

8

2

2 10

10

.1 8

4

'3 2

3

35

Remarks ,.,,., -,

Sheared.

6

3

4 9

1 0

4 0

1 0

6

2 6

6 0 Dip, 20o-45 °

.

1 0

9

3

1 6

6

3 o

3 0

9 0

Dip, 50°.

Dip, 50c-40P,

40o 0

71 0 Dip, 30°-40°.

10 0
Lo2, hole 4-1-5 EF, (ont.)

Dep2th

Prom- To- Thiclness

Ft. in. Ft. in. Material Ft. : in.

39 :0 357 0 Siltstone, with thin streaks

of claystone and carbonized

plant fragents

357 0 361 0 Fine sandstone, with streaks of

dark, carbonized plant fragments

361' 0 384 0 Interbedded sandstone and dark

siltstone, with carbonized

plant fragnents

384 0 412 0 Medium sandstone, with thin,

carbonaceous streaks and dark,

silty streaks

412 0 412 6 Carbonaceous siltstone

412 6 413 0 COAL .

413 0 413 6 Carbonaceous siltstone

415 6 416 5-1/2 COAL

416 5-1/2 417 4-1/2 Bone, with coal streaks

417 4-1/2 418 11 COAL

418 11 419 2 Bone

419 2 419 10 Carbonaceous clays tone

419 10 420 10 COAL

420 10 422 4 Bony coal

422 4 423 6 Carbonaceous olaystone

423 6 424 0 Siltstone, with streaks of coal

424 0 425 0 Carbonaceous olaystone

425 0 426 0 Bone and carbonaceous claystone

426 0 426 3 Coaly clays tone

8 0 Dip, 40 ° .

4 0

25 0

28 0 Dip, 20P-300.

6 ika bed .

6 Dip 25°.

6 l., 650.5 ft.

2 11-1/2)

11

1 6-1/2) c-83564.

3

8

1 0

1 6

1 2

6

1 0

1 0

5

Remarks

Log, hole 5-15 EA

Location:

Elevation:

480 feet S. and 2,000 feet E. of NW. corner, sec. 15,

T. 19 N., Re 5 E., Seward Meridian, Eska, Alaska,

Collar of hole - 1,068 feet.

* Depth

From- ToFt. in. Ft. in. Material

O0 Tl 0 Overburden clay, with a little

gravel, lower 4 ft., decomposed claystone, with carbonized plant fragments

14 0 15 0 Claystone, with carbonaceous

plant fragnents

15 0 18 3 Coaly, carbonaceous claystone,

with thin streaks of coal

and bone

18 3 18 8 Bone and siltstone

Thickness

Ft. in. Remarks

14 o

1 0

5 5

5

- 59 -
LO - hole 5-15 E .(.Cobnt.

Depth

From- Th- a

Ft.

~TS

19

19

19

19

20

20

22

22

23

23

in." PFt. in. Material

8 19 6 Ironstone; with calcite and

coal erifolded

6 19 8 Fine sandstone

8 19 10 COAL

10 19 11 Bone

11 20 4-11/?' CAL

4-1/2 20 7-1/2 Bone

7-1/2 22 2 COAL

2 22 6 Ironstone, folded with coal

and& calcite

6 23 6 Coal, with thin streaks of

bone

Thickne ss

Ft. in. Remarks

2

2) Martin bed; el.,

1 1,048.3 ft.;

5-1/2) 0-83565,

3

1 6-1/2)

. 4

i 0

4:,

16

10

23

26

10

8

Bone

Coal, with thin streaks of

bone 2

26 8 27 0O Bone

27 0 29 0 Carbonaceous claystone 2

29 0 51 0 Fine sandstone 2

31 0 37 0 Siltstone and fine sandstone,

with carbonized plant fragments and dark streaks 6

37 0 40 0 Dark siltstone 5

40 0 42 0 Fine sandstone' ' 2

42 0 55 0 Fine sandstone and dark

siltstone 13

55 0 71 0 Medium to coarse, light-gray,

dark-speckled sandstone .16

71 0 75 0 Claystone, with carbonized

plant fragnents , 2

73 0 76 0 Fine sandstone, with dark

siltstone. bands 5

76 0 77 b Dark clays tOne .1

77 0 78 6 Fine sandstone ' : 1

78 6 83 0 Dark, silty claystone, with

carbonized plant fragnents

and 1 ironstone band 4

83 0 85' 6 Fine sandstone, with dark,

silty bands 2

85 6 89 0 Dark claystohe, coaly at top 3

89 0 92 0 Fine sandstone 3

92 0 128 0 Interbedded siltstoni and

fine sandstone, iith thin

streaks of carbonized

plant fragaenrts 36

128 0 130 4 Dark, silty claystone, with

abundant plant. fragments 2

10'

4..

0

0'

O0

0

0

c-83566.

Dip, 5°-10°.

0

0

0 Dip, 10°-15°.

0

0

6

6 :. ., . .

6I- .~. 1 :. -

6

6

0

0 Dip, 50-100°

4 Slickensides.

4564 - 60 -
Log, hole 5-15 PA (Cont.)

DepthFrom- - .O i

rhickness

Ft. in.

k

t. in. Ft. in. Material

130 ~ 150 7 Coaly claystone, with tin,

pyrite bands

152 7 152 9 COAL

132 9 132 11 Bone

152 11 134 0 COAL

154 0 134 3 Bone

134 3 155 2 COAL

135 2 135 3 Carbonaceous silts tone

155 5 1356 1/2 OOAL

156 1/2 156 2 Bone

136 2 156 6 Siltstone and ironstone

156 6 145 0 Claystone, with thin streaks

of coal and coaly claystone

145 0 147 0 Sandy claystone

147 0 149 0 Claystone

149 0 149 3 Ironstone

149 3 151 0 Olaystone

151 0 164 0 Siltstone, with streaks of

fine sandstone, steep and

vertical fractures 1

164 0 166 0 Claystone

166 0 175 0 Irregular, bedded siltstone

and fine sandstone

175 0 178 0 Claystone

178 0 182 0 Intorbedded siltstone and

fine sands tone

182 0 203 0 Irroeglar bedded fine sandstone 2

203 0 215 0 Interbedded medium and

coarse sandstone 3

215 0 243 6 Coarse, light-gray, darkspeckled sandstone, with

blobs of coal

243 6 245 0 Dark, carbonacoous claystone,

with thin streaks of coal

245 0 252 10 ine sandstone, with thin

streaks of dark siltstone

containing carbonized

plant fragments

252 10 255 6 COAL

253 6 254 6 Coaly claystone, with streaks

of coal

254 6 255 0 Silty ironstone

255 0 265 0 Interbodded fine sandstone

and. dark silts tone 1

265 0 266 6 Coarse, speckled sandstone

266 6 279 0 Dark, silty claystone, with

abundant plant fragents 1

4564- -

3 B bed; e.

2 2 ) 937.4

2 0-8356

i )

11

1

9-1/2 C-85567.

11/4

4

1.,

ft.;

7.

Remarks

111:.,.

8 6

2 0

2 0

3

1 9

13

2

9

3

0

0

0

6

Slickens ides.

4 0

_1 0

.0 0

3o 6

ft 1 6 Dip, 4Po.

7 10

8

1 0

6

Dip, 30°.

C bed.

.0

1

.2

0

6

6 Dip, 29°.
Log, iole 5-15 EAk (Cont.)

Depth . FSom- ToFt. in.' F t. in Material

279 0 *2-~ 0 Fine sandstone, interbedded

with dark siltstone

288 0 ' 28 0 Caloareous claystone

289 0 294 0 Dark, silty claystone, with

abundant carbonized leaves

294 0 296 0 Fine sandstone and dark

silts tone

296 0 305 O Dark, carbonaceous claystone

305 'O 305 1 Ironstone

305 1 305 3 COAL

305 3 305 5 Ironstone

305 5 305 10 Bone and coaly claystone

305 10 306 6 Dark siltstone

306 6 307 0 Ironstone

307 0 308 0 Fine sandstone

308 0 310 4 Dark, carbonaceous claystone

510 4 311 0 OMAL

311 0 312 0 Bone and coaly claystone

312 0 512 6 Sandy claystone

312 6 316 0 Fine sandstone

316' 0 317 1 Claystone, with streaks of

coal and bone

317 1 317 5-1/2 .COAL

317 5-1/2 317 7 Bone

317 7 320 3 Carbonaceous claystone and

bone

320 3 520 6 ODAL

520 6 320 9 Bone

320 9 321 4 Carbonaoeous claystone, with

streaks of bone

321 4 321 10 COAL

321 10 322 8 bilded ironstone, with blebs

of coal and streaks of

calcite

322 8 325 9 COAL

323 9 324 7 Bone

324 7 325 0 Claystone, with ironstone

streaks

325 0 329 0 Fine sandstone

329 0 330 0 Dark clays tone

330 0 330 5 Ironstone

330 5 353 0 Dark, carbonaceous claystone

335 0 333 5 Bone

335 5 533 10 Carbonaceous claystone

333 10 334 2 Bone

334 2 334 4 Carbonaceous claystone

334 4 335 10 COAL

Thickness

Ft. in. Remarks

9

1

5

0

0

0

2 0

9 0

.1

2

2

5

8

6

1 o0

2 4

8

1 0

6

3 6

Dip, '35°.

Dip, 250.

Dip, 25°.

1

1

1

4-1/2

1-1/2

2 8

3

5

7

6

10

I 1

10lO

4 o

1 0

5

2 7

5

5

4

2

1 6

) C-83569.

4564 - 62 -
k

Log, hole 5-15 EAt (Cont.)

Depth

From- Tbo- ThLckness

Ft. in . Ft. in. Material Ft.* in.

355 10 338 0 Claystono, with thin streaks

of coal and bone 2

338 0 338 3 Siltstone, with claystone

streaks

338 3 359 3 COAL 1

339 3 339 6 Carbonaceous silts tone

559 6 346 0 Carbonaceous claystone, with

streaks of coal and bone 6

346 0 348 0 hFne sandstone 2

348 0 370 0 Interbedded and crossbedded

fine sandstone and dark

siltstone, with carbonized

plant fragnonts and blebs

of coal at base 22

570 0 374 0 Ironstone, with numerous

thin calcite veinlets and

a bleb of coal at .base 4

374 o 374 6 Siltstone

374 6 379 0 Ironstone 4

,379 0 384 0 Dark silts tone 5

384 0 408 0 Intorbedded dark, silty claystone and dark siltstone

with occasional thin streaks

of coal 24

408 0 422 0 Fine sandstone, with thin

streaks of dark siltstone

and occasional ironstone

concretions 14

422 0 425 0 Dark silts tone 3

425 0 454 0 Dark claystone, with

occasional blobs of coal 9

434 0 435 0 Ironstone 1

435 0 436 0 Claystone 1

436 0 440 0 Siltstone 4

440 0 441 0 Ironstone, with calcite

veinlets 1

441 0 450 0 Fine sandstone 9

450 0 565 0 Massive medium to coarse,

light-gray sandstone, with

tan and dark speckles 115

565 0 566 6 Dark, carbonaceous claystone 1

566 6 567 6-1/2 COAL 1

Remarks

567 6-1/2 567 7 Clays tone

1

1/2) Little Bka

group; el.,

501.5 ft.

Dip,. 300;

567 7 569 0 COAL 5 ) 0-83696.

- 63 -
Log, hole %-15 EA nt.)

Delpth_

Frona- To- Thickness

Ft. in. Ft. in. Material Ft. in.

5 '0 570'5 - Carbonaceous, claystone, withl

streaks of coaly claystono 1 6

570 6 572 6 COAL 2 0

Remarks

Dip, 200- 400

C-83696.

572

572

6

9

572

574

574 o 576

576 2 577

577 1 582

582 6 582

582 9 586

586 0 586

586 6 587

587 6 588

588 0 588

588 7 589

589 3 591

591 3 591

591 6 591

591 7 592

592 o 592

592 9 600

600 8 602

602 0 602

602 1 603

603 0 604

604 0 604

604 2 605

605 9 605

605 10 606

606 5 606

606 8 607

607 5 607

607 9 622

9 Bony coal

0 Coal and bony coal, with

streaks of coaly claystone

2 Carbonaoous claystone, with

thin streaks of coal and

bone

1 Bony coal

6 Carbonaceous claystone, with

thin strcaks of bone

9

0

6

6

0

7

3

6

7

0

9

5

Irons tone

Coaly clays tone, with streaks

of coal and bone

Bony coal

Carbonaceous clays tone

Bony coal

Carbonaceous clays tone, with

streaks of bone

Bono

COAL

Ccrbonaceous olaystone

Bono

COAL

Bony coal

1 3

2 2

11

5 5

53

3 3

6

1 0

6

7

'8

2 0)

3

1

5

9

Dip, 450.

Slickons ided.

Dip, 200-4Co.

Dip, 30°.

El., 479.5 ft.

0-83697.

Dip, 30P.

IE., 467.2 ft.

C-83698.

Dip, 50°.

8 Carbonaoeous clays tone, with

streaks of coaly claystone

and irons tono 7

0 Bone and coal 1

1 Carbonaceous claystone

0 Bone and coal

0 Bony coal, with thin streaks

of carbonaceous clays tone 1

2 Coaly claystone

9 Coal, with a thin ironstone

streak end thin bony

s treaks 1

10 Irons tone

5 Carbonaceous claystone, with

streals of coaly claystone

8 Irons tone

5 Bony coal

9 Calcito bands in coaly clays tone

0 Hard, calcaroous, gray, massive,

fine sandstono and

s i lts tone 14

- 64-

0

2

7

11

7

3

9

4

5

11

4

1

11

0-85698.
Log, hole 5-15 EA (_ont.)

Deqth

From- ToFt. in. Ft. in. Material

622 0 656 - . Interbedded and orossbedded

hard, calcareous, fine

sandstone and dark siltstone, with thin clayey

streaks near base

Thickness

Ft. in.

I

Remarks

34 0

Location:

Elevation:

Log, hole 6-10 EA

60 feet N. and 35 feet W. of S. 1/4 corner, sec. 10,

R. 3 E., Seward Meridian, Fska, Alaska.

Collar of hole - 1,121 feet.

T. 19 N.,

Depth

From- ToFt. in. Ft. in. Material

0 0 21 0 Overburden, decompoased claystone, sandstone, and a

few rooks

21 0 23 0 Siltstbone

23 0 35 0 Fine sandstone

35 0 57 9 Massive, speckled, medium

sandstone

57 9 58 3 Ironstone

58 3 60 3 Coal with thin bony streaks

60 3 62 8 Coaly claystone, with thin

streaks of coal

62 8 64 4 COAL

64 4 64 9 Coaly claystone

64 9 65 2 COAL

65 2 65 11 Coaly olaystone

65 11 66 1 Silty clays tone

66 1 68 6 Siltstone

68 6 76 0 Fine sandstone, with dark

carbonized bands and leaf

franlents

76 80 0 Dark siltstone

80 0 94 0 Interbedded dark siltstone

and fine sandstone

94 0 95 0 Clays tone

95 0 95 6 Limestone and ironstone

95 6 97 0 Clayey claystone

97 0 98 3 Dark claystone

98 3 101 3 COAL

Thickness

Ft. in. Remarks

21

2

12

0

0

0

22 9

6

2 0)

2 5

1 8)

5

5)

9

2

2 5 «

A bed; el.,

1,063.3 ft.

0-97348.

Dip, 300.

Do.

B bed; el.

1,012.2 ft.;

0-97349.

7

4

14

1

1

1

3

6

0

0

0

6

6

3

a)

101 3 105 3 Dark claystone 2 0

4564 - 65 -
Log, hole 6-10 EA (Cont.)

Depth

,Frm- To- , TIhickness

Ft, in. Ft. in. t. in. . Material PF

105 3 117 0 Dark silty olaystone, with

plant fra@aentz 1

117 0 122 0 Fine sandstone

122 0 128 0 Dark claystone

128 0 132 0 Fine sandstone

152 0 140 0 Clays tone, 'with thin ironstone end silty streaks

140 0 143 0 Dark claystone

143 0 143 6 COAL

145 6 146 6 Coaly olaystone, with thin

streaks of ooal

146 6 i46 8 Bony coal

146 8 147 6 Interbedded ooaly olaystone

and dark claystone

147 6 151 0 Claystone, with thin streaks

of ironstone

151 0 177 0 Interbedded and crossbedded.

fine sandstone and siltstone,

with thin, folded, carbonized

bands and a few ooal

fragpents 21

177 0 189 0 Siltstono, gracing into fine

sands tone 1

189 0 224 6 Massive medium to coarse

sandstone, with numerous

blebs and folded fragments

of coal in top. 31

224 6 225 0 Dark claystone, with streaks

of coaly clays tone

225 0 250 0 Fine, crossbedded sandstone

230 0 230 6 Ooaly olaystono

230 6 230 8 Bone

230 8 232 4 COAL

232 4 253 3 Bone

233 3 235 3 Claystone

235 5 270 0 Interbedded medium and fine

sandstone and siltstone, with

some crossbedding and thin,

dark streaks of carbonized

plant fragments 35

270 0 274 0 Claystone

274 0 294 0 Siltstono, with streaks of

fine sandstone and

occasional ironstone 24

294 0 304 0 Dark, silty claystone, with

thin ironstone bands 1I

5

3

D

9

0

0

0

0

0

6

O

Remarks

Dip, 100.

3

5 

5 0

2 Dip, I o.

10 Dip, 10o- 2Co.

5 6

6 0

2 0

5 6

6

5 0

6

2

1 8)

11

2 0

54 9)

4 0

0 0

0 0

C bed; 0-97550.

Dip, 200-50°.

4564: - 66 -
Log, hole 6-10 FA (Cont.)

,, Depth

From- To- Thickness

Ft. in.

4

Ft. in. Ft. in. Material

504 0 311 0 Dark claystone, with numerous

carbonized fragoents

311 0 312 6 Coaly clays tone

512 6 312 9 Ironstone

312 9 313 0 Coaly claystono

313 0 319 0 Dark claystonc, with numerous

carbonized frasments

319 0 319 6 Coaly claystone

519 6 324 6 Calcareous siltstone, with

calcite veinlots

324 6 527 10 Dark claystono, with streaks

of coaly claystono

327 10 328 9 OOAL

328 9 328 10 Ironstone and coal

528 10 529 6 COAL

329 6 529 9 Ironstone and coal

329 9 330 10 COAL

330 10 331 7 Bony coal

331 7 337 0 Dark claystone, with thin

streaks of coaly claystono

and coal

357 0 550 0 Fine sandstone, with thin beds

of silts tone

350 0 363 0 Interbedded and cross-bedded

fine sandstone and dark

silts tone, with occasional

ironstone nodules

363 0 365 3 Dark, silty claystone

365 5 365 6 Ironstone

565 6 367 6 Coaly claystone, with streaks

of coal

367 6 371 6 Dark, silty claystono, with

streaks of coaly claystone

371 6 377 0 Silty claystono, with ironstone bands

577 0 581 0 Fine, calcareous sandstone,

with thin, dark siltstone

bands

381 0 395 0 Dark siltstono, with numerous

ironstono bands 2

395 0 410 0 Interbedded and crossbedded

fine sandstone and siltstone 3

410 0 422 0 Silty claystono, with dark

carbonized bands J

422 0 425 0 Silts tone

7

1

0

6

3

3

6 0

6

5 0

3 4

11)

1

8

3

1 1)

9

5 5

13 0

Remarks

D bed.

0-97551.

13

2

0

3

53

Dip, 10°.

Do.

a

2 0

4 0

5 6

4 0

L2 0

L7 0

12

3

0

0

4564
Iog, hole 6-10 EA. (Cbnt.)

Depth ljon- ToFt.

w2

437

447

450

454

571

578

581

585

in. Ft. in. Material

0 437 0 Hard, modium-spocklod sandstone, with thin, dark,

silty bands

O 447 0 Intorodded dark siltstone

and dark, silty claystono

0 450 0 Siltstone

0 454 0 Fine sandstone

0 571 0 Massive medium to coarse

light-gray sandstone, with

tan and dark speckles

0 578 0 Dark siltstone

0 581 0 do.

0 583 2 Dark claystone, with streaks

of coaly clays tone

Thickness

Ft. in.

12 0

Remarks

10

5

4

0

0

0

0

0

0

Dip, 20° .

117

7

5

2 584 2 COAL

2

1

2

0)

Dip, 200.

Little 3iska

group; el.,

558.8 ft.

0-97552

0-97553.

584

584

586

586

2

8

2

10

588 5

589 10

592 8

594 2

597 6

598 0

584

586

586

588

589

592

594

597

598

603

60o

607

607

607

610

611

612

612

615

613

614

615

605

603

607

607

607

610

611 612

613

615

6!4

5

6

0

1

7

5

5

4

7

0

1

U1

8 Bony coal

2 COAL 1

LO Coaly clays tone

5 Dark dlaystone, with streaks

of coaly clays tone 1

10 COAL 1

8 Coaly claystone, with streaks

of coal 2

2 Bony coal, with streaks of

carbonaceous claystone 1

6 Clays tone 3

0 Irons tone

5 Dark, silty claystone, with

streaks of coal and ironstone 5

6 Bony cooal and coaly claystone

0 Bony coa.l

1 Siltstone.

7 Bone 6nd coaly olaystono

5 Coaly claystone, with streaks

of ironstone and bone 2

3 COAL i

4 Clays tone 1

7 Ironstone and coal

0 COAL

1 Bone

-1 COAL .1

5 Coaly claystono, with colcite

veinlot and streak or ironstone and bone

- 68 -

6

6)

8

7

5)

10

6

4

6

5

3

6)

1

6

8

0)

1

5)

1

10)

C-97554. 

I

Dip, 25°.

C-9755.

6

4564
Log, hole 6-10 EA (Qont.)

Depth

From- To- Ti

Ft. in. Ft. in. Material Fj

i5 h 5 75 *0 Interbedded gray sandstone

and siltstone, with streaks

of ironstone; coaly claystono

blob at 616 ft. 3 in.

bickness

t. in.

9 7

Remarks

«

Log, hole 7-10 EA

Location:

oELvation:

590 feet N. and 1,760 foot E. of SW. corner, sec. 10,

R. 3 E., Seward Meridian, Eska, Alaska.

Collar of hole - 1,223 foot.

T. 19 N.,

Depth - -

9rom- ToFt. in.

0 0

2 0

25 0

41 0

Ft. in. Material

Thickness

Ft. in.

2 0

Remarks

2 0 Ovorburden

25 0 Coarse and conglomeratic

gray sandstone, with green

and dark speckles

41 0 Gray siltstono, with thin

streaks of silty claystone

50 0 Interbedded siltstone and

and fine sandstone

60 0 Gray, very fine sandstone

60 3 Ironstone

60 6 Coaly claystono

63 6 Coal, with thin streaks of

bone

23

16

9

10

0

0 Dip, 200.

0

0

3

3

50

60

60

60

I

63

64

65

66

66

67

69

70

72

73

74

74

75

79

83

84

0

0

3

6

6

7

5

6

11

5-1/2

6

6

0

0

3

9

9

0

8

2

64

65

66

66

67

69

70

72

73

74

74

75

79

83

84

85

7

5

6

11

5-1/2

6

6

0

3

9

9

0

8

2

2

Coaly clays tone

Irons tone

Coaly clays tone

COAL

Bono

COAL

Coaly claystone, with

streaks of ironstone

COAL

Clays tone

Coaly clays tone

COAL

Coaly clays tone

Clays tono

Silty claystone

Irons tone

Coal, with streaks of

coaly clays tone

- 5 -

3 0 Maitland;

el., 1,162.5

ft., C-98414.

1 1 Dip, 30°

10

1 1

5)

6-1/2

2 1/2) C-98415.

1

1

1

1

1

3

4

0

6

0

6

0

.3

8

6

C-98416.

C-98416.

1 0
Log, hole 7-10 EA (Cont.)

Dom- ,pfth

.From- - - -. -

Ft. in.

85 2

t.

93

ini. Material

0 Siltstono, with streaks

of coaly claystono and

coal

0 Silts tono

6 Ironstone

6 Bony coal

Thickness

Ft. in.

93

96

96

97

100

102

0

0

6

6

6

0

96

96

97

100

102

105

6

0

0

Dark clays tone

Coaly clays tone

Cool, with thin streaks of

bono

7

3

1

3

1

3

10

0

6

0

0

6

Remarks

Dip, 30° .

105 0 10 6 Clays tone

105 6 106 6 Coaly claystone

106 6 107 6 Bony coal I

107 6 107 9 Coaly claystone

107 9 109 0 Siltstone 1

109 0 115 0 Medium sandstone 6

115 0 136 0 Intorbodded gray siltstone and fine svndstone,

with occasional ironstone 21

136 0 140 0 Clr-ystono, with streaks of

coaly claystone and

ironstone 4

140 0 186 0 Interboddeod gray siltstone and fine sandstone,

with thin streaks of

silty clays tone 46

186 0 200 0 Medium sandstone, with

thin stroeks of

silts tone 14

200 0 212 0 Gray claystone, with

occ asional ironstone

nodule and carbonized

plant frago.nts 12

212 0 212 3 Coaly ironstone

212 3 213 ° C0aly claystone

213 0 214 0 Bony coal 1

0 David, el.,

1,121.0 ft.;

C-98417.

6

0

0

3

5

0

0

0

0

0

0

3

9

0

6

0

onery; el.,

1,010.0 ft.

214 0 216 6 Claystono, with coaly

streaks

216 6 218 6 Bony coal

218 6 219 10 Claystone, with thin,

coaly streaks

219 10 220 1-1/2 COAL

220 1-1/2 220 2 Ironstone

220 2 221 6 QAL

2

2

1 4

5-31/2)

1/2

1 4) C-98585.

4~64 - 70 -
Log, hole 7-10 FA (Cbnt,)

.._ - pth..... mroi_ ,- Tb-, I

I

t

a

n. t F t. in. Material

221 6 21- 8-1/2 Bone

221 8-1/2 224 6 COAL

224 6 225 3 Clays tone

225 3 226 4 COAL

226 4 226 9 Coaly claystone

226 9 230 0 Claystone, with thin,

coaly streaks

230 0 255 0 Fine sandstone, with

streaks of ironstone

235 0 246 0 Claystone, with shaly

streaks and plant

fragments

246 0 251 0 Fine sandstone

251 0 281 0 Siltstone, with occasional ironstone streak

281 0 297 0 Iark claystone, with ocoasional shaly and ironstone streaks

297 0 297 8 Claystone, with streaks

of coaly clays tone

297 8 298 2 COAL

298 2 298 5 Ironstone, with pyrite

298 5 298 11 COAL

298 11 299 2 Ironstone, with pyrite

299 2 299 8 COAL

299 8 303 0 Claystone, with thin streaks

of coaly clays tone

303 0 303 6 Coaly clays tone

303 6 306 6 Coal, with thin, calcite

veinlets

306 6 307 0 Bone

307 0 307 6 Coaly claystone

307 6 311 6 Siltstone to very fine

sands tone

311 6 313 6 Coaly claystone, with thin

streaks of coal and ironstone

513 6 313 8 Gray clay

5l3 8 314 2 Drk e clays tone

314 2 320 0 Fine-to modium-gray

sands tone

320 0 480 0 Medium-light-gray sandstone

with dark-brown, green,

and black speckles 14

480 0 484 0 Siltstone

Ihickness

Ft. in.

- 2-1/2

2 9-1/2)

9

1 1 )

5

3 3 Dip, 20°.

5 o

Beemarksj

11

5

0

0

30 0

L6 0 Dip, 10°-20°.

8

6

3

6

3

6

3 4

6

Dip, 300.

Dip, 30°.

3 0 Bed 9; el.,

919.5 ft.,

C-98418.-

6

6

a

4

2

0

0

2

6

5 10

50 0

4 o

4564 - 71-
oi, hole '7-10 EA. (Cont..)

Depth _ From- Tot - m -. .. Ft. Iin.-

Thickness

Ft . in. , M O.- 492 0

Material

Silty clays tone, grading

into shlly claystone,

with coaly streaks at

base

Bemarks

Dip, 10°-20°.

492

499

520

556

0 499 0 Medium sandstone

0 520 0 Siltstone, with scattered

ironstone bands

0 556 5 Interbedbdd and crossbedded, dark-gray siltstone and fine, lightgray sands tone

5 537 1 Bone

8

7

a1

0

0

0 

1

537 1 538 10 COAL

538 10 559 8 Siltstone

559 8 540 0 Coaly claystono

540 0 540 4 COAL

540 4 540 8 Clays tone, with coaly

streaks

540 8 541 4 Coaly claystone

541 4 542 4 Bony coal, with ironstone

542 4 545 8 Coaly clays tone'

543 8 544 8 Bony coal

544 8 546 9 Coaly olaystone, with

streaks of bone

546 9 547 9 Claystone, with coaly

a traks

547 9 548 3 Ironstone

548 3 549 6 Siltstone, with streaks of

irons tone

549 '6 558 0 Interbeddod and crossbodded,

light-gray, fine sandstone and dark-gray

siltstone

558 0 561 0 Siltstone, with streaks

of ironstone

561 0 564 11 Dark clays tono, with coaly

" ironstone streaks

564 11 565 0 Pyrite

565 0 566 0 Bony coal

6 5

8

1 9

10

4

4

Eska; el.

686.6 ft.

1

1

1

4

8

0

4

0

2 1

1 0

6

1 3

8 6

5 0

5 11

1

1 0

* Shaw; el*.,

658.0 ft.

Dip, 10°-209.

566 O 567 6 Dark claystono, with coaly

streaks

567 6 568 7 Bony coal

568 7 569 10 Bone, with streaks of

coaly claystone

569 10 571 2 Coaly clays tone

1

1

1

1

6

1

4

4564 - 72 -
Log, hole 7-10 EA (Cont.)

. Do th__

- ,. 

Ftrom- To- Th; ", -. .

t

I

t

Ft. in. Ft. in. Material FL

571 '2 572 2 Bony. coal 1

572 2 572 11 Ironstone and coal

572 11 575 2 Bony coal

573 2 574 2 Coaly claystono 1

574 2 574 8 Bony coal

574 8 578 6 Siltstone 3

578 6 579 6 Coal acnd ironstone

579 0 580 0 COAL ' 580 0 581 0 Coaly claystono, with

streaks' of irons ton 1

581 0 583 0 Claystone 2

583 0 587 0 Silts tono, with thin ironstone and olaystono streaks4

587 0 597 Interboddod fine sandstone

and siltstono, shaly

near top and ironstone

near bottom 10

597 0 603 8 Shcly claystono, with thin

ironstone streaks 6

603 8 606 0 Claystono, with thin ironstone and coaly stroaks 2

606 ' 608 9 GOAL 2

ic4kness

* in.

0

9

o

6

10

6

0

Remarks

0

0

0

0

8

4

9 )

Dip, 200.

Martin; el.,

617.0 ft.

c-98584.

*

608 9 609 'o Bone

609 0 611 0 Cliaystono, bone, cnd

ironstone

611 0 613 3 COAL

613 3 ,613 6 Bone

613 6 615 4 Claystone, with streaks of

coaly claystone and

ironstone

615 4 616 10 Bony coal

616 10. 617 6 Bono, with streaks of

cocly olaystono

617 6 620 6 0o aly clays tone, with

streaks of bone

620 6 622 0 Bono, with streaks of

coaly clrys-tone

622 0 630 0 Claystono, with streaks

of ironstone

630 0 662 0 Siltstono, with thin

streaks of ironstone

and fine sandstone

2

2

1

1

3

0o

3

5

10

6

)

*

8

3 o

1 6

8 o0

32 0

4564 - 73 -
Log, hole 8-10 EA

Location:

ELevation:

880 feet No and 580 feet E. of S. 1/4 corner, sec. 10, T. 19 N4 ,

R. 3 E., Seward Meridian, ska, Alaska.

Collar of hole - 1,225 feet.

Depth

From- ToFt. in. Ft in. Material

0 0 18 0 Overburden, glacial drift,

gravel with few boulders

18 0 22 0 Fine to medium sandstone

22 0 115 0 Massive, light-gray, medium

sandstone, with dark

speckles and a few thinbedded clay and fine sandstone streaks

113 0 115 0 Dark clays tone, with some

slickensldos

115 0 121 0 Dark-gray, interbodded, fine

sandstone and silts tone

121 0 156 6 Interbedded dark siltstone

and claystone, with

occasional ironstone nodule

and thin calcite veinlet at

135 ft.

i36 6 144 0 Interbodded fine sandstone

and siltstone

144 0 152 9 Dark claystono, with silty

streaks and occasional

ironstone nodule

152 9 153 4 Bony coal

153 4 155 4 Dark claystone

155 4 166 0 Interbedded fine sandstone,

siltstone, and claystone

166 0 183 6 Hard interbedded and crossbedded gray fine sandstone

and dark siltstone, with.

carbonized plant fta@enents

183 6 187 I Hard siltstonu, with some

ironstono nodules

Thickness

Ft, in.

18 0

4 o

Remarks

91 0 Dip, 45°.

2 0

6 0

15 6 Dip, 300-45°.

7 6

8 9

7

2 0

Slickensides.

Dip, 30P.

10 8 Slickensides.

17 6 

3 7 Eska; el.,

1,035.9 ft.

187

187

187

189

189

190go

190

190

'194564

1

9

10

8

4

7

9

187

187

189

189

190

Igo 190

190

191

9

10

3

8

4

7

9

0

COAL

Irons tone

COAL

Bony coal, with white flakes.

and calcito voinlets

Coal, with thin stroaks of bone

Coaly clays to n and bone

Bony coal

Ironstone and coal

8)

1

1 5) Dip, 5°; D-479.

5)

8)

3

2

3

- 74-
Log, hole 8-10 EA (Cont.)

FProm- To -

191

193

195

194

195

195

197

197

198

in. Ft,

0 - 195

0

8

2

6

10

0

8

1 t

201 0

204 0

222

227

227

228

0

3

6

8

229 8

250 8

195

. 194

. 195

. 195

197

197

198

201

204

222

227

227

228

. 229

230

231

231

234

256

238

' 238

239

239

240

242

242

242

243

243

244

245

245

246

247

270

in, Material

. 0 Coaly claystone, with streaks

of coal

8 Bony coal

2 Clays tone

6 Siltstone and ironstone

10 Bony coal

0 Coaly claystone

8 Bony coal

1 Ironstone

0 Coaly claystone, with streaks

of coal

0 Siltstone

0 Interbedded and crossbedded

gray sandstone and dark

siltstone, with ironstone

inclusions and thin streaks

of carbonized plant fragments

3 Clays tone

6 Ironstono

8 Clays tone

8 Coaly claystono, with streaks

of coal

8 Ironstone and coal

4 Intcrbedded coaly claystone

and ironstone

10 Coaly claystone and bone

11 COAL

2 Clays tone

0 COAL

9 Ironstone, with coal inclusior

2 Coaly clays tono

6 Clays tone

0 Ooaly claystone

0 COAL

3 Irons tone

6 COAL

0 Coaly clays tone

5 Irons tone

3 Clays tone and coaly claystono

5 Clays tone

9 Coaly clays tono

6 Clays tone

0 Coaly claystone

0 Siltstone, with thin streaks

of fine sandstone and occasional ironstone nodule

6 Claystono, with streaks of

coaly clays-tone and ironstone

- 75 -

2

5

Thickness

Ft, in.

2 0

8

6

1 4

4

1 2

8

5

18 0

5 3

1 2

Ramarks

r

Dip, 5°-20°.

Dip, 0o.

1

1

0

0

11

0

231

231

254

236

238

258

239

239

240

242

242

242

245

243

244

245

245

246

247

4

10

u

2

0O

9

2

6

0

0

3

6

0o

5

3

3

9

6

0

"i

8

6

3 1)

1 3

1 10)

s 9

5

4

6

2 0

5

3

6

3

1 0

1 0

6

9

6

Shaw; el. 991.1ft.

D-480.

Sliokensiddes,

Dip, 20P.

Dip, 100.

23 0 Dip, 5o-150.

270 0 273

4564 3 6
LoA, hole 8-10 EA (Cont.)

o Depth oFrom- ToFt. in. Ft.

2754 27

274 0 275

275

276

277

0o

0

0

276

277

282

in. Material

0 Coaly clays tone

0 Bone, with streaks of coaly

clays tone

0 Coaly claystone

0 Claystono, with blobs of coal

0 Intorboddoed gray, fine sandstono and dark siltstono,

with ironstone nodules

0 Claystone, with occasional

irons tone no dule

0 line sandstono and siltstone,

with occasional ironstone

0 Intcrboddod s iltstono, silty

claystono, and claystono

7 Claystono, with1 ironstono

nodules and calcite voinlots

along fractures

3 Bone

Thickness

Ft. in. -- -- Remarks

Dip, lO'-3P.

1 0 Martin; el.,

949.0 ft.;

dip, 10 .

1 0 Dip, 10°-20° .

1

5

0

0

282 0 287

287 0 296

296 0 308

308 0 317

517 7 318

5 0

9 0

12 0

9 7 Sliokensidos.

8 A bed; el.,

905.6 ft.

1 2 D-553.

7

4

518 5

519 5

320 0

320 4

321

322

324

324

2

0

0

4

319

520

3P

522

324

324

325

328

360

5

0

4

2

0

0

4

10

0

0

COAL

Carbonaceous and coaly clays tone

Ironstone

Carbonaeoous and coaly claystono

Bono

COAL

Bone

Carbonaceous claystone, with

stroeas of bono and coal

Olays tono

Crossboddod, mcdium to coarse

gray sandstono, with tan

speckles and thin streaks

of fine sandstone and dark

silts tone

10

10

2 0

4

D-554.

325 10

328 0

1

2

52

1

1

6

2

0

0

0

a

360 0 561

361 o

362 o

362

363

0 Limes tone,

veinlets

0 Silts tone

6 Limes tone,

vcinlots

9 Bontonitic

voinlot

7 Clays tone

7 Bony coal,

stone

with calcite

with calcito

clay', with calcite

with streakof iron563 6 363

1 6

3

10

1 i 0 0

365 9

564 7

364

365

4564 - 76 -
Log, hole 8-10 EA (Cont.)

___m-Dopt

TFrom-To Thi

Ft.... Ft.

369

588

394

in.

7

0

0 .

0

Ft.

588

394

402

in. Material

4o2 0 405

405 6 412

t 412

413

413

0

0

3

413

413

419

419 0 425

425 0 459

459 0 454

454 0 463

465 0 475

475 0 478

478 0 496

496 0 534

0 Medium to coarse sandstone 3

0 Silts tone 19

0 Fine sandstone 6

0 Siltstone, with occasional

ironstono nodule 8

6 Fine sandstone, with 2-in.

calcite voinlet 5

0 Dark claystono, with silty

streaks 6

0 Coaly claystoneo 1

3 COAL

0 Claystono, with thin coaly

streaks 5

0 Interbodded fine sandstone and

siltstone, with occasional

ironstone nodule 6

0 Claystone, with thin, coaly

and carbonaceous streaks 14

0 Fine to medium sandstono, with

thin streaks of siltstone 15

0 Interboddoed silty claystone,

silts tono, and fine

sendstone, with slickensides

in the claystone 9

0 Hard siltstone to very fine

sandstone 12

0 Silty claystone and siltstone 3

0 Very fine sandstone, with

occasional ironstone nodule 18

0 Fine to medium sandstone,

with occasional ironstone 38

0 Medium to coarse gray sandstone, with dark speckles 47

6 Clays tone

9 Bone

6 Fine sandstone 1

9 Coaly claystono, with streaks

of bone

-0 Irons tone

1 COAL 2

1 Bono

7 Coaly claystone, with streaks

of bone 1

1 Irons tone

3 Clays tone

5 COAL

.ckness

in.

5

0

0

0

6

-

6

0

3

ip, 5°-10°.

9 Dip, 5°-100.

0

0

0

0

0

0

0

0

0

6

3

9

O

Remarks

I

554

581

581

581

585

583

585

585

586

587

588

588

0

6

9

6

9

10

11

1

7

1

3

581

58

583

583

583

585

586

587

588

588

588

0 581

I

3

1

1)

2)

D bed; D-555.

6

6

2

2

- 77 -
Log, hole 8-10 Ef. (oInt.)

, Dopth

romm- ToFt.

)88

588

590

in.

5

9

0

Et.

588

590

600

in. Material

600 0 606

606 0 628

628 0 648

648 0

648 6

648

649

649 5 651

651 0

651 6

655

655

655

657

658

659

0

4

10

6

6

0

659 7

659 9

660 0

651

655

655

655

657

658

659

659

659

660

660

662

662

667

668

668

668

668

671

672

672

673

9 Clays tone

0 Silty claystono

0 Fine sandstone, with thin

streaks of silty claystone

0 Siltstone, with a few carbonized plant fragaents

0 Siltstone, with thin streaks

of silty claystdne, ironstone, and sandstone

0 Dark claystone, with carbonized plant fraguents

and thin coaly and ironstone streaks

6 Bony coal

5 Coaly claystone, with streaks.

of bone

0 Hard, calcareous, fine sands tone

6 Coaly claystono

0 Dari claystone, with thin,

coaly streaks

4 Coaly clays tone

10 COAL

6 Darkl cla stone

6 Coaly claystono, with streaks

of bone

0 Dork clays tone

7 COAL

9 Coal;y clays tono

0 COAL

8 Dark clays tone with coaly

s treals

4 COAL

6 Carbonaceous ironstone

9 Dcrk claystone

0 COAL

2 Ironstone

5 Clays tone

7 COAL

4 Dark claystono, with coaly

streaks near top

4 COAL

10 Coaly clays tone

6 Coal, with streaks of coaly

clcystono

0 Dark claystono, with thin

streaks of coaly claystone

and coal

- 78-

10 0 Dip, 10,

6 0

Thickness

Ft. in.

1 3

.22 0

t

20 0

6

11

1 7

6

3 6

4

6

1 8

1 0

6

7

2

3)

8

1 8)

2

5 5

3

2

1

4

Remarks

Little Eska

group.

D-556.

660

662

662

667

668

668

668

668

671

672

672

8

4

6

9

0

2

3

7

4

4

10

S

2

1

9

0

6

673 6 676

8

2 6 4564
1

Ios, hole 8-10 EA (Cont.)

From- TbFt.

676

677

677

678

in.

* 0

6,

06

6

Ft.

677

677

677

678

679

in. Matorial

6 -Coaly clays tone

0 Irons tone

6 Bony coal

6 Carbonaceous claystone

0 Bony coal, with streaks of

coaly claystone

0 Clays tone

Thickness

Ft. in. --

6

6 :

1 0

6

i 0

Remarks

679 0 680

Iog, hole 9-10 SE.

Location:

oevation:

1,315 feet N. and 870 feet E. of S. 1/4 corner, seo. 10,

T. 19 N., R. 3 E., Seward Meridian, Eska, Alaska.

Collar of hole - 1,263 foot.

,Depth

From_- To- - . ...

.] ft, in. Ft. in. Material

0 0 18 0 Ovorburden, clay and send

18 0 0 0 Intorbedded siltstone amnd

silty claystono

30 0 59 0 Claystone, with thin streaks

of ironstone

39 0 39 6 Coaly claystone

59 6 40 7 Bony coal

40 7 49 0 Dark claystone, with streaks

of coaly claystone

49 0 49 6 Ironstone

49 6 50 6 Coaly claystone, with

streaks of bone

50 6 65 0 Siltstone, with thin streaks

of ironstone, sandstone,

and clays tone

65 0 74 0 Hard fine sandstone, with

ironstone nodule

74 0 85 0 Gray medium sandstone, with

thin, silty streaks and

thin, carbonized streaks

85 0 105 0 Massive, medium-gray sandstone, with tan and dark

speckles

.05 0 120 0 Interbeddod, dark, fine sandstone and siltstono, with

thin streaks of carbonized

plant fragnonts

20 121 6 Claystono, with thin streaks

of coaly claystono

.21 6 124 0 COAL

L24 0 124 1 Irons tone

24 1 126 5-1/2 COAL

Thickness

Ft. in.

12 0O

Remarks

9 0

6

1 1

8 5

6

Dip, 100-200.

A bed.

Dip, 20°.

-

1 0

14 6 Dip, 10P.

9 0

11 0

20 0 Dip, 350-45 ° .

15 0

1

1

1

1

1

1 6

2 6)

1

2 2-1/2)

Dip, 450.

B bed; el.,

1,142.5 ft.

D-8011.

4564 - 79 -
Log, hole 9-10 fA (OCnt.)

D__s tDe0pth

From- ToF. in. Ft. in. Matorial

6 35-/2 2- 9 Bones

126 9 127 3 COAL

127 5 127 4 Clays tone

127 4 127 9-1/2 COAL

127 9-1/2 127 10-1/2 Bono

127 10-1/2 127 11 COAL

127 11 127 11-1/2 Bono

127 11-1/2 128 1 COAL

128 1 128 5-1/2 Shale and bone

128 5-1/2 128 10 COAL

128 10 132 0 Clays tone

152 0 143 0 Silts tone

143 0 162 0 Fine to medium gray sandstone

162 0 245 0 Massive, coarse, gray

sandstone, with brown

and dark specks

245 0 250 0 Interbeddod fine and medium

gray sandstone

250 0 255 0 Dark, silty clayston..

255 0 260 0 Dealr claystone, with thin

streaks of coaly claystone

260 0 264 0 Dark, silty claystone

264 0 266 0 Fine sandstone

266 0 274 0 Dark olaystono, with thin

coaly and. silty stroaks

274 0 282 0 Fine gray sandstone, with

thin, dark, silty streaks

282 0 305 6 Dark claystone, with thin,

coaly strorks and. oocas ionel irons tono no dulo

505 6 306 6 Coaly claystone, with

streaks of coal

306 6 508 7 Cocl, with thin streaks of

bono

308 7 308 10 Coaly claystono

308 10 309 2 Bony coal

509 2 512 10 Clays tone

312 10 513 0 COAL

515 0 525 0 Claystone, with streaks of

siltstone and ironstone .

Thickness

Ft. in.

5-1/2

6 ) .1

5-1/2)

1

Remarks

1/2)

1/2

1-1/2)

4-1/2

4-1/2)

2,

0

5

ll31

19 0

83 0 Dip, 0 .

5

5

5

4

2

0

0

0

0

0

Dip, 20P-300.

8 0 Dp, 30°P.

8

23

1

0

6

0

Dip, 100-200.

2 1

3

4

5 8

2

D bed. 

12 0 Fractures

at 45°.

325

345

4564

0 345 0 Dark gray siltstone, with

streaks of ironstone

0 356 0 Fine to medium gray sandstone

20 0

11 0

- 80 -
Log, hiolo -1 -EA (Cont.)

-Depth_

From- To b- Thic

Ft. in. Ft. in. Material Ft.

35V 0 56C 0 Massive, coarse gray sandstone, with brown specklos 10

566 a 404 0 Interbodded and crossbeddod

silty claystono, siltstone,

end fine sandstono, with

irons tone streaks 58

404 0 405 6 Clays tone 1

405 6 405 8 Ironstone and sandstone,

with calcite

405 8 406 2 Ooaly claystone

406 2 406 2-1/2 Clays tone

406 2-1/2 408 1-1/2 COAL 1

,knossa

in., . Remarks

0

0

6 T

9 2

6

11

1/2

W )

408 1-1/2 408 2-1/2 Bone

408 2-1/2 409 9-1/2 COAL

409 9-1/2 409 11 Bone

409 11 410 4-1/2 COAL

410 4-1/2 410 6 Bone

410 6 413 0 Clays tone

415 0 427 0 Intorboddod, dark, silty

claystone and siltstone,

with streaks of ironstone

427 0 434 8 Dark claystone, covered

with calcite

454 8 435 0 Coaly claystone

435 0 436 0 COAL

436 0 438 6 Bony coal, with streaks of

coaly clays tone

438 6 439 6 Coaly claystone and bone

459 6 440 5-1/2 COAL

440 5-1/2 440 6 Bony coal

440 6 440 7 Ironstone

440 7 441 5 COAL

441 5 441 7 Bone

441 7 441 8 COAL

441 8 441 9 Bone

441 9 442 4 COAL

442 4 442 6 Bone

442 6 446 0 Dark clays tone

446 0 447 6 COAL

447 6 447 10 Dark olaystone

447 10 449 8 Coal, with thin streaks

of bone

449 8 450 0 Dark clays tone

450 0 450 9 Bony coal, with thin

ironstone streaks

1

1 .7 )

1-1/2

5-1/2)

1-1/2

2 6

Dip, 45P.

Little Eska

group; el.,

855,2 ft.

D-8012.

Dip, 45 ° .

0

7 8

4

1 0

2 6

1 0

9-1/2)

2-1/2

1

10 )

2

1 )

1

7 )

2

5 6

1 6

4

1 10

4

Sliokens ides.

D-8013.

Dip, 45°.

D-8014.

9

4564 - 8 -
lo . hole 9-10 EA (COnt.) i .a . -I i* a .J-. -- - - . -.

Depth -- -- · From- TIo- * x - s

Ft. .' in. it. in. Matorial Ft.

450 - 435 0 Coaly claystono

451 4 0 Sands tonoe 1

452 0 457 0 Claystono end calcite

voinlets 5

457 0 505 0 Interbedded gray sandstono and dark siltstone 48

ThJLcknoss

* in.

0-

0O

IRomarks

0 Sliokonsides.

0 do.

4564 - 82 -


Drill hole

1-15-1 .................................

(492 ft. 4 in. to 495 ft. 6 in.)

2-15-A ............................

(275 ft. 3 in. to 279 ft. 6 in.)

2-15- .................................

(276 ft. to 276 ft. 9 in.)

2-15-A .................................

(277 ft. 6 in. to 278 ft. 6 in.)

3-15-IA .................................

(518 ft. 1 in. to 521 ft. 7 in.)

4-15-JA ...............................

(413 ft. 6 in. to 419 ft. 2 in.)

-10-A ................................

(187 ft. 1 in. to 190 ft. 4 in.)

1-15 .................................

(532 ft. 2 in. to 535 ft. 9 in.)

2-15-1A. ...............................

(306 ft. 8 in. to 312 ft.)

3-15-1 ..................................

(559 ft. to 561 ft. 9 in.)

A

Lab. go.

c-78003

C-78692

C-86312

c-86313

C-80438

0-83564

D-479

C-78029

C-78693

C-85530

Conditioni

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

Moisture

2.9

3.0

2.0

2.0

-

3.4

2.5

2.5

3.2

2.8

3.2

2.1

~-'

4.7

2.9

3.0

3.0 i -

-sYU- C1---cpwga-- -

ZIi

olatile

matter

40.3

41.5

45.5

38.9 3g-9

40.1

48.1

34.2

34.9

48.6

32.5

3.2

39.1

40.5

47.7

42.1

43.2

4g.7

38.2

37.9

39.2

40.8

42.0

47.6

36.8

3.0

47.5

32.4

38.9

35.4

31

39.3

49.4

38.9

51.3

40.5

47.7

I'

I - I

Tasiilit ofa-

---.

TAME 4. - Analyses of coal cores, East Eaka Gre area, Matausaka Valley iel&, Eska. A1aks (Contt.) 

_. _ . I ti nfttna nercent I

.ixed

carbon

48.2

49.6

54.5

41.8

43.1

51.9

36.2

36.9

51.4

33.7

34.4

50.9

42.8

44.3

52.3

44.3

45.4

51.3

45.2

44.9

46.3

44.9

46.1

52.4

4o.7

42.1

52.5

34.0

34.7

51.1

4o.l

42.1

53.2

40.8

42.0

50.6

36.9

38.1

48.7

41 3.0

Aan

8.6

8.9

16.3

16.8

27.6

28.2

31.8

32.4

14.7

15.2

11.1

11.4

14.1

14.0

14.5

11.5

11.9

19.3

19.9

31.5

32.2

19.8

20.8

16.5

17.C

21.2

21.E

14.,

15.1

.U-Hydro- i Nimtro7 I F r gsIaY - a I I ur I gen SarDonL ge"

o.5

.5

.5

.5

.5

.6

.4

.4

.6

.4

.4

.5

.4

.4

.5

.5

.5

.6

.4

.4

.4

0.5

.5

.6

.5

.5

.7

.5

.5

.7

.5

.5

.7

0.5

.5

.6

.5

.5

.6

.5

.5

.6

5.7

6.1

5.1

5.:

6.;

4.

4.1

6.:

54.

4.:

6.:

5.

5.

6.]

5.

5.

6.

5.

5.

5.

UP

5.

5.

6.

5.

4.

6.

4.

4.

6.

5.

5.

6.

L<

IS COAL BSD

1 71.3

5 I73.5

L 80.7

+ 65.7

2 67.7

5 81.3

5 56.0

4 57.1

2 79.5

3 52.4

2 53.5

2 79.0

4 66.6

2 68.9

1 81.2

7 69.7

6 71.5

3 80.6

4 1 67.4

5 66.9

3 69.1

PER SHAW COAL

6 69.7

4 71T.7

2 81.4

1 62.4

9 64.4

.2 80.5

.4 52.7

.3 53.8

.3 79.4

.3 61.0

.0 64.0

.4 80.8

)OIE SHAW COAL

L.6

1..7

L.8

1.3

L.4

1.6

1.4

1.9

1.3

1.4

2.0

1.5

1.6

1.8

1.7

1.8

2.0

1.7

1.7

1.7

1.7

1.7

1.9

1.5

1.6

1.9

1.2

1.3

1.9

1.4

1.5

1.8

BID

1.5

1.6

1.9

1.3

1.3

1.7

1.7

1.8

2.1

>agen

12.3

9.9

10.9

10.8

8.4

10.2

10.1

8.5

11.8

9.8

5.1

12.3

11.4

8.7

10.4

11.3

9.2

10.5

11.0

11.5

9.0

11.0

8.9

9.9

11.2

8.7

10.7

9.7

7.9

11.7

12.0

8.2

10.3

10.9

8.6

10.3

11.4

9.1

11.6

10.8

8.1

9.9

alorific

value

B. t.a.

12,970

13,360

14,660

11,840

12,200

14,660

10,110

10,320

14,360

9,440

9,620

14,240

11,980

12,400

14,620

12,700

13.030

14,710

12,150

12.050

12,460

12,630

13,000

14,750

11,300

11.670

14,570

9,510

9.710

14,330

11,020

11,560

14,590

11,760

12.110

4, 590

10,830

11,170

14,290

±4.UIU7

2,380

2,780

2.910+

2,800

2,680

2,620

2,520

2,800

2,910

2,910+

2,910+

2,620

2,080

2,830

anmibilit of ash

Initial

ieformation

temperature.

O°T.

2,450

2,840

2,870

2,750

2,680

2,620

2,890

2,910+

2,730

2,150

2,910+

Softening Fluid

temper- temper- 0. , LbfU Oyare

°F.

, 650

,g890

2,910+

2,870

2,80

2,780

2,910+

2,840

2,470

Peal

specific

gravity

1.344

1.40

1.51

1.55

1.39

1.34

1.38

1.350

1.43

1.54

1.44

1.406

1.47

1.38

30 m

36

8

11

Core

receivd,

inches

34

37

m

4o

28

12

35

17

36

m

Core

rejected,

inches

6

14

6

3

20

2

19

Core

analyzed,

inches

i

28

17

8

11

36

26

28

m

i

34

20

28

9

28

14

25

3-15-IA ........................ 1... C-80491

1-15-IA ................... . C-78030

(539 ft. 9 in. to 543 ft. 6 in.)

2-15 A .. .... ............. C-78694

(314 ft. to 315 ft. 9 in.)

2-15-IA ........... .......... .C-78695

(315 ft. 9 in. to 319 ft. 4 in.)

5.3

5.1

6.2

4.9

4.7

6.0

5.5

5.3

6.2

65.3

67.2

81.0

60.7

62.6

80.1

66.8

68.9

81.2

- 85 -

3

7

3

n

44.4

1 52.3

12,450

14.660

See footnote at end of table.

4564
Drill hole

3-15-A .................................

(565 ft. S in. to 572 ft.)

S-10-H .................................

(231 ft. 10 in. to 242 ft.)

1-5-1ZA .................................

(561 ft. 2 in. to 564 ft. 4 in.)

1-15- ..............................

(565 ft. s in. to 568 ft. 1 in.)

2-15-..A ................................

(347 ft. 10 in. to 349 ft. 7 in.)

3-15-..A ...............................

(592 ft. 1 in. to 594 ft. 8 in.)

3-15-SA .................................

(595 ft. 8 in. to 597 ft. 10 in.)

5-15A .................................

(19 ft. 8 in. to 22 ft. 2 in.)

5-15- ..............................

(23 ft. 10 in. to 26 ft. 8 in.)

7-10-A .................................

(606 ft. to 613 ft. 6 in.)

6-10-f .................................

(58 ft. 3 in. to 65 ft. 2 in.)

8-10-.A .................................

(318 ft. 3 in. to 319 ft. 5 in.)

5-15-JA ...............................

(130 ft. 7 in. to 136 ft. 2 in.)

6-10-A ................................. (98 ft. 3 in. to 101 ft. 3 in.)

Lab. No.

.-o0492

C-7S095

0-7S096

C-78696

C-85531

C-0o493

cG-3565

0-83566

C-98584

C-97348

D-553

C-83567

C-97349

Condition/

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

I

2

3

I

2

3

I

2

3

1

2

3

ture

3.8

2.5

3.4

2.8

2.8

3.0

i

1.8

-

4.1

-

3.2

3.6

2.0

3.0

2.6

3.2

2.6

3.1

2.9

2.7

3.4

I olatile

matter

50.4

39.0

38.6

40.0

40.1

41.2

48.8

40.2

41.3

48.0

37.5

35.6

36.2

48.0

4o.8

42.5

46.7

39.4

40.7

47.7

36.1

35.7

36.8

38.8

35.5

39.8

38.4

38.2

39.4

39.1

40.3

47.2

40.9 qo.q

40.6

42.1

Proximate. Dercent I Ultimate. nercent

39.2

40.7

49.6

46.6

46.2

47.8

42.0

43.3

51.2

4 .6

52.0

42.4

43.7

53.1

38.6

39.3

52.0

46.6

48.6

53.3

43.1

44.5

52.3

48.9

50.7

56.2

35.1 38.1

37-7

39-9

43.7

43.5

45.0

45.3

45.1

46.6

43.g

45.1

52.8

50.5

50.1

51.8

Fixed Sul- Hyrio- I mtrocarbonl h I fur gen CarbonI gen [Olygen

- t - -

101

17.1 0.6

175g .7

.8

11t9 0.6

1lt5 .6

12.2 .6

1541 0.5

15;5 .5 - .6

13,4 .5

13.8 .5

.5

17.1 .4

17,6 .5 4 .6

24.0 .3

24.5 . 4

.5

8.5 .4

i,9 .4

.5

14.3 .3

14.s .4

.4

9.4 .4

9.5 .4

3 .· 4

23.6 .4

24.3 .

14.9 0.6

14.8 .6

15.2 .b

13.7 .7

14 .77.

14.2 o.4

14.6 .4

5-b .4

5. .8

6.1 .8

R S CAL B - Continued 4tH SHAM COAL. RD - Continued

5.4 ] b3.6

5.1 66.1

6.3 80.5

TABLE 4 - Analyses of coal cares, last Eaka Creek area, Matanuska Valler field, Eska. Alaska (bntd.)

1.5

1.5

1.9

11.8

8.8

10.5

LW COAL BD (Upper and Lower)

5.4

5.5

5.3

69.6

68.9

71.4

5.2

5.1

6.0

5.5

5.3

6.2

5.4

5.2

6.3

5.0

4.9

6.4

5.9

5.6

6.2

5.5

5.3

6.3

5.6

5.3

5.9

5.0

5.1

4.9

5.5

5.5

5.3

5.3

5.4

5.2

5.4

5.2

6.1

5.8

5.s

5.6

MARTN COAL BD

66.6 1.5

b8.5 1.5

1.1 1.8

68.5 1.5

70.4 1.6

81.7 1.8

64.9 1.5

66.S 1.5

81.1 1.9

59.s 1.4

60.9 1.4

80.6 1.S

70.3 1.7

73.3 1.7

80.5 1.9

66.4 1.7

68.6 1.8

80.4 2.1

70.5 1.7

73.2 1.8

81.1 2.3

60.3 1.4

59.6 1.3

61.5 1.4

COAL BID

b6.6 1.7

bb.2 1.7

68.3 1.5

67.9 1.7

67.5 1.7

69.7 1.7

1.7

1.6

1.7

10.8

11.6

S.8

11.1

8.9

10.5

10.6

8.4

9.8

10.7

8.4

10.1

9.5

7.9

10.7

13.2

10.1

10.9

11.8

9.1

10.8

12.4

9.5

10.6

9.1

10.0

7.5

Calorific

value

B. t.u.

11,410

11,860

14,430

12,440

12,320

12,780

11,960

12,300

14,550

12,330

12,680

14,710

11,760

12,120

14,710

10.800

10,990

14,550

12,910

13,460

14,780

12,070

12,470

14,620

12,690

13,170

14,600

10,850

10,740

11,070

Initial

deformation

temperature,

Or.

2,090

2,750

2,100

2,840

2,890

2,910+

2,910+

2.910

2,680

2,890

2,470

2,210

2,520

2,220

2,230

2,00

2,230

2,890

2, 910+

2,910+

2,820

2,910+

2.590

2.340

2,620

2,330

i

i

Softening

teaperature.

oa,

B COAL BD

In.4%4tII. _* _.Lt

Fluid

temperature,

Op.

2,520

2,890

2,470

2,910+

A

Real

speci ic

grarit

1.42

10.7

11.2

8.8

10.7

11.1

8.7

11.5

9.3

10.9

11.1

11.7

S.9

12,060

11,980

12,370

12,260

12.190

12,580

12.090

12.450

14, 580

13,4140

13,340

1iS810 1

2,880

2,750

2,490

2,820

2,5 40

1.37

1.397

1.369

1.40

1.46

1.33

1.37

1.35

1.46

1.38

1.38

1.39

1.31

Core

received,

inches

27

82

32

29

21

30

14

27

24

Core

rejected

inches

3-1/2

22

6-1/2

3

2

an

i

2

2

a

2

3

14

23

24

32

6

3-1/2

21-1/2

18

56

11

62

16

38

11

66.7

68.7

80.5

74.5

73.9

76.6

1.8

1.8

2.1

1.9

1.9

2.0

7-1/2 54

15

See footnote at end of table.

4564 - 86 -
-10-A .................................

(322 ft. to 324 ft.)

9-10- ................................. 1 

(121 ft. 6 in. to 128 ft. 10 in.)

6-10- .................................

(230 ft. 8 in. to 232 ft. 4 in.)

6-10- ................................

(327 ft. 10 in. to 330 ft. 10 in.)

8-10-A .................................

(583 ft. 10 in. to 586 ft. 1 in.)

5-1 5-A .................................

(566 ft. 6 in. to 569 ft.)

5-15-EA .................................

(570 ft. 6 in. to 572 ft. 6 in.)

5-15-iA ...............................

(158 ft. 7 in. to 591 ft. 3 in.)

5-15-f .................................

(600 ft. g in. to 603 ft.)

5-15-XA ................................

(604 ft. 2 in. to 605 ft. 9 in.)

6-10- ............ ...................

(583 ft. 2 in. to 586 ft. 2 in.)

6-10-A ..................................

(588 ft. 5 in. to 589 ft. 10 in.)

6-10o-A .................................

(603 ft. 6 in. to 607 ft.)

6-10-fl ................................

(610 ft. 3 in. to 614 ft. 11 in.)

S-10-U .................................

(659 ft. to 662 ft. 4 in.)

9-1o-a .................................

(406 ft. 2 in. to 410 ft. 6 in.)

9-10-F& ................................

(1439 ft. 6 in. to 4142 ft. 6 in.)

9-10-A .................................

(447 ft. 10 in. to 449 ft. S in.)

I . io.

Drill hole Lab. No.

D-554

D-S011

c-97350

0-97351

6-555

0-83695

c-33696

C-83697

0-85433

C-3369s

c-97352

C97353

c97354

0-97355

D-556

D-8012

D-B013

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

I

2

3

1

2

3

1

2

3

1

2

3

1

2

3

Gondi

tixorY

2.5

3.3

2.6

3.7

2.7

3.6

2.6

3.4

2.S

3.4

2.6

2.5

2.5

1.8

2.8

2.0

2.7

2.0

2.7

1.8

2.2

2.1

2.7

2.1

2.6

1.9

2.9

2.0

3.2

2.1

2.9

Hoi -

tare

41.8

41.5

42.S

36.9

36.5

37.9

39.2

28.8

40.3 4o. 3

41.2

40. !

42.3

35.5

35.2

36.5

43.4

44.5

49.0

41.7

42.8

48.9

43.0

44.1

49.7

36.2

36.9

49.1

40.8

42.0

47.0

41.7

41.3

42.5

40.2

39.9

41.0

36.9

36.7

37.5

33.6

33.4

34.3

41.9

41.7

42.S

37.8

37.5

3S.6

35.4

35.0

36.1

33.C

32.7

33.7

Volatile

matter

Proximate. nercent I Utimate. Dercent

45.3

45.3

46.6

47.0

46.5

4E.3

54.0

53.5

55.5

49.7

49.2

51.0

39.8

39.6

41.0

45.0

46.2

51.0

43.6

44. 7

51.1

43.6

44'.7

50.3

37.4

38.1

50.9

46.1

47.4

53.0

44.7

44.5

45.7

43.4

44143

38.7

38.7

39.5

36.2

36.0

37.0

3S.8

38.6

39.6

43.3

42.8

44.1

46.2

45.6

47.1

39.0

38.7

39.S

ol -Ai

carbon

TALE 4. - nalyses of coal cres, ast ska Creek area, katanuska Valley field. lak, Alaska (Contd.)

10.4

10.3

10.6

13.5 13-5

13.3

13.8

4.1

4.1

4.2

6.5

6.5

6.7

2a.

21.8

22.5

9.0

9.3

12.2

12.5

10.9

11.2

24.6

25.0

10.3

io.6 10.6

11.6

11.5

11.8

14.}

14.3

14.7

22.6

22.4

23.0

28.1

27.9

28.7

17.2

17.1

17.6

17.0

16.8

17.3

16.1

16.2

16.8

25.9

25.7

26.5

Ash

0.6

.6

.6

.4

0.6

.6

.6

0.5

.5

.5

.5

.5

.5

far

0.5

.5

.6

.4

.4

.4

.2

.2

-3.3

.4

.3

-3.4

.7

.7

.7

.4

.4

.4

.3

.3

.3

.4.4

.2

.2

.2

0.4

.4

.4

.5

.4

.5

.5

.5

.5

5.3

5.6

6.2

5.7

5.5

6.3

5.8

5.7

6.4

4.8

4.6

6.2

5.5

5.4

6.0

5.6

5.6

5.5

5.6

5.7

5.5

5.1

5.1

4.9

4.6

4.6

4.5

5.1

5.-

5.0

5.3

5.4

5.2

5.1

5.2

5.0

4.6

4.6

4.14

B COAL BE - Continued

5.8 70.8 1.8

5.8 70.4 1.8

5.6 72.6 1.8

5.4 67.5 1.7

5.4 66.8 1.7

5.2 69.3 1.7

C COAL BE

5.6 76.8 2.0

5.7 76.1 2.0

5.4 i 7.9 2.1

D COAL WED

5.6 74.9Q 1.g

5.7 74.3 1.8

5.5 76.9 1.8

5.0 60.9 1.7

5.0 60.6 1.7

4.8 62.7 1.7

1Hdro- [itrogen Carbon gen Oxygen

LITmE ESKA GROUP COAL BEDS

71.9

73.8

81.4

69.0

70.8

80.8

70.4

72.2

81.3

58.9

60.0

s0.0

71.0

73.0

81.7

70.3

69.7

71.7

67.8

67.2

69.1

61.0

60.7

62.1

56.6

56.2

57.8

64.9

64.6

66.3

65.2

64.5

66.4

65.8

b5.0

67.1

57.2

56.s

58.5

1.5

1.6

1.4

1.4

1.6

1.3

1,h

1.5

1.3

1.8

1.4

1.4

1.6

1.8

1.7

1.7

1.7

1.7

1.7

1.4

1.5

1.4

1.3

1.6

1.6

1.6

1.6

1.6

1.6

1.7

1.6

1.6

1.7

1.5

1.5

1.6

10.6

11.1

8.8

11.5

12.5

9.6

10.9

11.5

8.8

10.7

11.2

8.6

10.0

10.4

7.8

9.3

10.2

11.3

9.4

10.9

11.4

9.3

10.5

10.1

8.7

11.6

11.5

9.3

10.3

10.0

10.7

8.5

10.1

10.7

S.6

9.6

10.1

8.2

8.9

9.6

7.2

11.0

11.3

9.3

10.5

11.3

9.0

10.6

11.6

8.9

10.3

10.9

S.5

12,840

12,760

13,160

12.210

12,080

12.540

13,680

13.560

14,050

13,340

13,230

13,690

11,010

10 940

11,330

13.110

13.450

14.S30

12,590

12,910

14,750

12,950

13,2a

14,960

10o630

10,820

14.430

12,820

1 ,750

12.760

12.670

13,020

12,330

12,230

12,570

11,060

11,000

11,250

10,200

10.140

10,420

11,610

11,550

11,50

11. 70

11,750

12,100

11.840

11,700

12,080

10,350

10,270

10,580

Celorific

value

B.t.u.

Initial Softening

deformation taepertemperature. ature,

°1. ; O0.

2,310

2,870

2,000

2,130

2.730

2,240.0

2,340

2,330

2.470

2,010

2,110

2.230

2.910+

2,620

1,.970

2,810

2,810

2,780

r

2,910+

2.050

2,210

2.840

2,310

2,430

2.400

2,600

2.100

2,200

2.340

2,700

2,090

2,910+

2,860

2,S40

2,420 2,590

2,260

2,360

2.910+

2,470

2,880

2,570

2,710

2,330

2,500

2,730

2,890

2,340

2,910+

2,910+

fluid

1.38

1.33

1.33

1.45

1.33

1.35

1.33

1.48

1.36

1.35

1.37

1.44

1.49

1.43

1.39

1.49

7luid

temper- Real

rture, specific O°. Eravi t

1.34

Core

14

68-1/2

S

received,

inches

36

26

12

29

4

28

19

28

12

21

49

33

40

32

11

l

rejected,

inches

13-1/2

4

2

Core

S

1/2

14

55

8

32

13

Core

analyzed,

inches

1

25-1/2

12

21

27

19

24

12

21a

41

25

35-3/2

24

11

8

8

$

- . --

- . . . - -

- ^ . z 4.t4 --- _ F-- L/ Ssmplo as recelvedi; a, Iaei as lat) I -. ; j l-sb-r - -w raw..

- 37 -

Int. - BuI of .Mines, P3 ., Pa.