R. I. 4129 NOVEMBER 1947

X UNITED STATES

DEPARTMENT OF THE INTERIOR

J. A. KRUG, SECRETARY

BUREAU OF MINES

JAMES Boyo, DIRECTOR

REPORT OF INVESTIGATIONS

MOUNT ANDREW IRON DEPOSIT, KASAAN PENINSULA,

PRINCE OF WALES ISLAND, SOUTHEASTERN ALASKA

By

W. S. WRIGHT AND A. W. TOLONEN
Rt I. 4129, -. .... ;

Rovember 1947.

REPu OF INVESTIGATIONS

,- , .UNITED STATES OF THE ; - BOR UREAU OF MIMES.

MOUNT ANDRE7I IRON DEPOSIT, KASAAN PENINSULA PRINCE OF WAILS ISLAND,

& SOUTHEASTERN ALASEA2;

By w6, S. i A. Wt W. Tolonen2/

, .... * .7 CONTENTS

Page

Introduction ....... . . *.* . * . 2

Location and accessibility 2

Physical features:,.d climate ef...........' ... 4

-Labor and living crnditions ..................... 4

' -'H' istory and procluction,. - * i - '- -*' -> Property and ownership , 5

Ore deposits.'...... * *.* * * *.' * * * * * . * * *A.* * - . 6

General geology .+' -.,.,. ; .6................. .'

Occurrence of deposits ........... 6...........

Trenching and core ............!jiling ,. r 7 -Trenh sampling .... ........ .......... 7

Core and sludge sampling 12

'Development ' 22 - ' w B~iefidiation,,te'sts . ................. 22'+^****f* 

*'''' Part l, Mount Andrew samples 4 and 5'...... 23

Part 2. Mount Andrew sample,6 *...... ... .25

ILLUSTRATIONS

Following Fig. . -''P

1. Index map showing location of Mount Andrew iron deposit ... 2

2. Topographic map of Mount Andrew-Mamie area ......... ....... 2

3. Mount Andrew geology, topography, and workings; ............ 6

4. Section of ore-'bdy I, drill holes A1 and 14 .............. 12

5. '-Section~ of ore bodies VI, and-Illdrill hole A2 ........ 12

6.' Section of ore body I',.drill holes A3 and 7 ............... 14

7. Section of ore body VI, drill. hole A4, trench C .......... . 14

8. Section of ore body VI, drill holes A5 and A6, trench4 .;4. 14' - 9. Section of ore body XV, drill holesq,_7a,_nd AS .. ..-.......- ---16

2/ The Bureau of Mines will welcome reprinting-of this paperprovided the

following footnote acknowledgrent"is used- "Reprinted from Bureau of

Mines Report of Inveatigatlons !4129."' ! Mining engineer, Bureau of Mines, Juneau, Alaska.' "' ./ Associa temining engineer, --Bureau of Mines, Juneau, Au s1.a. ,

1783
R.I. 4129

IlLUSTRATIONS (Continued)

Fi:. . .:-,-. . , Following

Fggs page ,1*.''D - Xrb_............................................,

10. Section of ore bodies I; -II, &n i4. iL holes 20 and 23;

trench 1E * . ... 0.4............., ,,.,,..,..-t>--Xz:s.. 18.

11. Section of ore bodies I andV.V, :dxill holes 27, 29, and 31.. 18

12. Section-of ore bodies IV and II; drillWT61 -3Zj=-tren 9..9 20

13. Section of ore bodies II and III, drill, hole.374 trench 3,. 20-

14. Sections of ore body XIV at 5200 . .. . ... .; ......... . - 20

15. Mayflower mine .*.. .............................. 20

16. Suggested flow sheet for milling oreefi".,the"copper-richn

area of-the Mount Andrew mine ............. ... 24

17. Suggested flow sheet for milling ore fXIS the "magnetiterich" area of the Mount Andrew mine ............. ... 26

The Mount Andrew ir6n-deposit on. Zasaan,;in la, Prignce of alles

Island, Southeastern Alaska -was-examined in Aigguft 1942 by' arien geer

of the BureAu of Mines, accompanied.by. goologf'st O the Fedjral Oeological Survey, From Oqctober 2CY to -2.7.,. 194.2, two en4gineers / o theBreau of

Mines made a further preI inW ry examination and tooK 'thiE~large .saples

of magnetite and agnetie-ccopper ore for meta:fUg2ical testing. - During

the summer of 1942 an iive6tigatien-of.the Mou tAfidrew-Stevenson-Mfamie

area, including top'graphic ' id geologic map&i X and a magnetic survey, was

made by geologist2/. of the Federal Geological Sbe i y.3J and June 2,

1943, two Bureau oIf Mines' en gineers~/i conductbe'd a. reliminary examination in

which special attention was directed to trails, ca6p, and drill sites. They

were accompanied oA May31 By L, As Thrnqr of the G*ogogic Survey-.

During the period from September 1943 thro ig4g Sdptenbt' 1944 Bureau of

Mines engineers completed a thorough investigation-whieh included trenching, core drilling and sampling. A Federal- Geological Survey representativ t amined all trenches and cores for geological data.

LOCATION AND ACCESSIBIUT

The de jsitj issituated at latitude 550 3it ,; Mhd- lngituade 1320 18'

W. on the north side of iKasaan Bay on Prince of OSAR Iesl4d,, So-uAtheastern

Alaska, The.gpneral location is shown on figures I3-and-2. The6d.eposit is

5 miles southeast 6'the village of Kasaa'n'and, by water 27 miles northwest

of Ketchikan; the Chip tunnel portal is 7/8 tile north of the Eoent Andrew

landing on Easaan Bay. -

!i/ Thneo,.r AL.' R -.

5/- Ree, 4oqphn C.j aid Goddard, A. N.

,i/ Holt, StephenhPV, and Thorne: Robert L. .. d-:-----.

g/ Goddard, A. N., W'arner, L. A. nd alton, Mat-

#/ Holt, Stephen P.,*-and Tolone , A. '.

/ toright; W'ilford S., Holt, Stephen P., Tolonen, A. W.,'nd Fosse, Earl L.

2,/ Bressler, Caldwell T.

1783 -2-
13238' LYMAN

I ANCH ORAGE

0 1000 2000

I Im/t --- " HOLE IN THE W L

//+ IXx '

e-t/ -b ss'32'

OF~~~~~~~O

IRMN TPOWN SC

MT.AN D RE0W A00 0 0\ 2 

BOGG5S

--- T RA M WAY S\

FROM. U.S.G.S. BULL. 87 ' \

/ t ~~KENNECOTT MWHITEHOR~t-'

O 200 I~~o \ 0q\pN S

Figure 1. - Index map showing location of Mount Andrew iron deposit.
r UN NELS 250e 0 280 500 FEET bUNNEy

GoCLORY HOLCES i CONTOUR INTERAL 20 HCOT

Figure 2. - Topographic map of Mount Andrew - Mamie area.
R.I. 4129

Kasaan has one store, a post office, an elementary school, and a cannery. Except in'the'salmon-fishing.-season in. July and Auigust, when the

'cannery is operating thecontuni-ty consists of less than 50 persons, mostly

native Indians.

Ketchikan, a city of about 6,000 people, is a seaport on the Inside

Passage waterway 750 miles north of Seattle and-has regular steamer service

by the Alaska Steamship Co., Northland Transportation Co,., Alaska Transportation Co., Canadian Pacific Railway Co., and the Canadian National Lines,

The ocean freight'rrate, -as'quoted by steamship companies, on ore or

concentrate from Mount Andrew to points on Puget Sound is $4.50 a ton, plus

longshoring chdrges-for loading and unloading. It is reported that marble

and limestone were transported-in barges from fall Island to.Seattle for

$0.90 a ton and that copper ore and concentrates were shipped from Salt

Chuck to Tacoma in small motorships for $1.50 a ton. It.is believed.that

a rate of $l.50 a ton, or perhaps less, may be secured for shipload lots.

Ketchikan is the best available source of food and mining supplies,

timber, and labor. Regular'weekly trips are made from Ketthikan to Kasaan

by.a motborship whichcairries mail, passengers, and freight. Dur7ing the

fishing season'there is a regular radiophone service from Kasaan to outside

points, via Ketchikan.

There are no roads on Kasaan Peninsula. zOne pack trail was repaired

by the Bureau of Mines from Mount Andrew landing to the mine camp. Only

blazed markings on trees indicated a route from Mount Andrew landing to the

Forest Service trail leading from Lyman Anchorage to Kasaan.

Airplane service from Ketchikan to Kasaan Bay, or return, if previously

arranged, is available on regular trips by small seaplanes of the Ellis Airways and Ketchikan Air Service of Ketchikan.. The fare is $10,00 a passenger

if set off or picked up on a regular trip. Charter trips at greater cost

may be arranged.

A fair-wreather anchorage for sea-going vessels is located directly offshore.rfrom the property. The nearest harbors, safe for small ships during

southerly storms, are at Long Islapd$ 1-1/2 miles south .of Mount Andrew landins. Safe harbors for larger vessels are at Coal Harbor, or.Twelve Mile Arm,

ae ops Kasaan Bay.

*~ ~~ t wer worke. as. an -e.t-r- de 

If the Mount Andrew-Mamie deposits were worked.as. an .indpendent enterprise it would probably be advisable to have the beach camp at Lyman Anchorage

at the abandoned Hadley smelter site on the northeast coast of Kasaan Peninsula.-The harbor at this p6int is sheltered, except on rare occasions when

:strong northerly winds blow; The beach topography'is advantageous for a

wharf} mill, and camp sites-.' Also an aerial tramway, if built to this beach,

could serve the Mamie and Stevenstownmines as well .as. the Mount Andrew mine.

If the Mount Andrew operation were to constitute a unit ef a'larger

enterprise directed by one company to exploit the ore reserves of several

1783 -3
R. I 4129

depolits on Prince of Woales Island, a site at Kasaan village wiith ts deepwater harbor ample fresh wate, And an established v i-ge wg Uld doubtless

be the' imost advantageou8 lopat-ion hor a centr2Ai i1L M This 'idl site would

be midway between th6e.Poor Man an;.Mpusnt;'Andrew ore deposits' .

PHYSICAL FEATURES AND CLIMATE

; The ore deposit li Qfn the up~p slopes and summit 6f iMouIt Andrew. at

an elevation of-9',250 to Th, 495 feet Small streams from a 'nuibe& of small

muskegs on top of MoIuzrA 44rew join to f orm. a larger stream fl'1ihg to the

.bay nedr the beach cazp,. This and the nearby streams are insufficient for

milling purposes. At the mine an ample supply, of water can be obtained for

mining purposes by impounding the mine drainage wvter, but' drinking water

must- be obtained front"another source,, such as. a.. small stream outside- of camp.

Plenty of water for milling purposes is available at Lyman Anchorages

-The climate is typi6al of southeastern Alaska, with mild temperatures

rarely dropping to 0° F. in winter, or rising-al>ove 90Q F. in -6umier.- Precipitdtion is heavy, totaling 150 to 159 inches a year, as reported at nearby

Ketchikan. Most of the precipitation is in the form of rain; snowfa.U averages only-a few feet a year. During :the winter of l943-Ls4 4 to 5 feet of

snow fell, but at no time were there over 2 feet of snow on the ground.'

Snowfall may occur any time. frcm October through April, but very seldom is

there any snow on the ground after April.

Mining operations can be conducted throughbut the year if proper housing

is provided. Shipping by vessels along 'the icd-freo Inside Pas'sage continues

throughout the year to and from Seattle. :

A dense undergrowth is found near sea level. Fine stands of spruce,

hemlock, and some yellow cedar would provide ample timber lor in-ing and

camp constructi.6h.

LABOR ND LIVING CONDITIONS.. -

Under peacetime conditions, labor is reported to have been plentiful

and wages reasonable in this area. When this-twas written-(May 1945) skilled

labor was scarce, and all wages werv hih4,. The 1hourly wage paid for co-60no

labor is $0..965; mechanics, miIIer&, and carpenters receive $1.20 to gj5Q an

hour for 40 hours Weekly, and time and a'lhal for Work over 40 hours.e' Xaaan,

a near-by source of labor, would (excpt' during fishing season) furnish a

limited number of native workers, some of whom are skilled carpenters and

mechanics -. . . :., ' .

Because of the mild climate, living conditipns are good, although the

excessive'rainfall is tryingfo'r outdoor- workmen vyo re not accdastbm~d to'

it. Housing facilities at the mine consist of tw;-t 'cabins whioh are 2habitable

but show prolonged deterioration.,

1783 7 ; ..-t-...i. ;V : ' 7 -4- 4' 
R.I. 4129

HISTORY AND PRODUCTION

Copper is reported to have been discovered on Kasaan Peninsula by the

.Russians as early as 1865Y but ore bodies were not developed until nearly

., year's later. Mineral locations were made between-1895 and 1900, and

deposits were extensively developed during the following 5 years. Mine.:

plants were installed, aerial tramways *ere erected, and a smelting -plant

was built .at Hadley, a camp. ont the beach at Lyman Anchorage.I 621the, north-6-

east side of Kasaan Peninsula.

In the Mount Andrew-area three important mines, the tount Andrew,

Stevenstofn, and Mamie, were brought into production by the Mount Andrew

Mining Co., the Hadley Copper Co., and the Brown Alaska Co.., respectively.0

Ore was first delivered to the smelter in the latter part of 1905;i producetion was large in 1906 and increased until the smelter was closed in the

autumn of 1907. The smelter was again started in 1908 but was operated for

a short time only. The .Mount Andrew mine was inoperative in 1908 but was

placed in production in March 1909 by the Mount Andrew Iron & Copper Co,

Ore shipments were made to the 'Tyee and Tacoma smelters. In 1910, a 1,600-

foot adit at an elevation of 1,040 feet was driven to undercut the ore

bodies 300 feet below the working levels. Neither copper ores nor magnetite

was-encountered in the lower adit,

The Mount Andrew mine produced intermittently until the close of World

latI,. when the collapse of the copper market and the exhaustion of accessible and higher-grade copper deposits-caused cessation of operations. The

aerial .tramway was dismantled,-and now all buildings, aside from two: rehabilitated by the Bureau of Mines,.are in ruins.

According to records, the production of the Mount Andrew-4amie area has

.amount~ed to about 270,000 tons of:copper ore, which yielded more than

$124,000 in gold and $32,500 in silver.

* - PROPETY AND OUVRNSHIP

The Mount Andrew Mining Co., a New York corporation, was dissolved

pursuant to the laws of New York in April 1940. Titles to its patents and

an undivided three-quarters interest were transferred to the stockholders

of the estate of H. Herbert Andrew. Participants in the estate receive

communications addressed in care, of Jarvis Barber & Sons, P. 0. Box 20,

Sheffield Telegraph Building, High Streets Sheffield, England. An undiyided

one-quarter interest was transferred to the estate of SSamuel Lichtenstadtler,

in care of Matthew Staff rd, Esq., Dexter Horton' Building, Seattle., Wdsh,

The instrument, of transfer was dated December 31, 1940.

The holdings consist of the Mount Andrew group of 10 claims, Juneau

Survey No. 552, the Rice and Jim, Survey No. 1026, and the Hal, Survey No.

1028, a toqtal of 13 patented claims.

1783 -r5
* ReIo 4129 : ;.

-ORE DEPOSITS

General Geology -

-The principal contry rock of theMof Andrei 4rea&is the Klaaan greenst6oe, hiicb .is -. ade 'up o.. metamrphosed' Adws and prclastics, interleyrered ith aisliceous and calcareous sedimnentss In some parts of the

area the greenstone has a very fii1-grained,.compact strucitqw resembling

that of a massive igneous .roek.. Presumably this -type is i reoua in. origin

and has bedn' g 1eatly at6ered to an almost homdgeaeous iass,.

;- ' The ~tne-grained material is found to merge graditiona& y into one in

which the'clastic textAre'.of quartzitet-and 5graywkokes-may be recognizzed.

Mach of the,country rock is so altered that its original composition, is coinpletely obscured, although it is believed that.it cQnsis't. largely of igneous

material worked~ oVer redhenically but not pbrceptibly decomposed. Since deposi-tionhowever, it has been greatly changed by shearing,'breociation, and

the formation of secondary mineral's such as ep. doe, garnet, hornblende,}

.dippside, chlorite, orthoclase, magnetite, ccopyrite, and pyrite.

Limiestones and conglomerates, are found interbedded witfh thq, raynackes

and quartzites in other parts of the. geenstone iatrix. The lim6tones.,

though warped. folded, and'recrystalized, are easily recognized. iThe layers,

seldom continuous for any great distance, thin, thicken, or play cpt abruptly.

Early.regionali metamorptism 'of the' formations comprising ,thet,,reenstone

may have been caused by the pressure of overlymio trata, but inore.-pro.nounced

alteration was, undoubtedly brzought About by'later invasion of A gra.nitic. intrusive produoed'much folding, fracturing And metmorphism nedr the contact

of the intrusive and invaded rocks, 'During stages of cooling, fissures and

cracks formed near the contact and offered ohannels for later magmatic injections which are represented by the numberous igneous dikes as shown in figure

3. These later intrusives increased the degree iof metamoi'hism along their

contacts with the greenstone, evidence of'!¶bich is 'founid in the abundanrice of

secondary minerals. Thus the entire Mount Andrev.area consists of an altered

greenstone lying at the'., ofitact of a granitic'. intrusiVe and between nearlY

vertical porphyritic digks+.,

O.Occurrence of D6Pepits

.~ ~ :r )6s -r. p ,a*e,,n;

The ore bodiesp aie replacement ddp6si~ts -pf thd contact metatrphic

ty~e and.occur as irregular lenses between the intrusive rocks.. Magnetite is

found in all degrees 'of abt~idance from sparsely disaeirindted mineral particles

in gtreenstone to the masaive: state- Pyrite and Ghalcr are usuafly. Xound

disseminated in the naine4te, ;although at places in the contact zone, .chalcopyrijteoocurs'in sufficient abundance tobe mined as copper ore. Much of the

copper ore.has already been mined.

Joint cracks and faults of slight displacement within the mineralized

area undoubtedly developed after the period of ore deposition. In a few

places these breaks have developed to the extent that the use of tinters

would probably be required in mining.

1783 -6_
11000 N-' w 7 -/ <°

;ltilI

LE 7

1~ ~~ ~~~~~~~ "S

i AD~~~~~~~~~~~~~~~~~~~~~ 

tmE~~~~~~~~~~~~~~~~~~I

LEGEND 4OO _0 _0 0 300

ORE RESERVES =3LOW S... CALE IN rEET GRADE 0) GLORY HOLE E SW.W ORE XIV- N W ORE BODY-CENTRAL BIAND DIORITC I CENTRAL UZ TRENCH' BA^IW N W-ORE BODY -WEST BLOCK

SYENITE fl EAST FLANK z TRENCH IW ~ I BY GLORY HOLE I5 BOSTONITE m S.ECENTRAL IC TRENCH I W BVT Y MT. ANDREW MAIN ADIT

0 ABORO IY EAST CENTRAL = S E-END TRENCH 4 VI MAG. BAND NORTH OF MAIN ADIT z3 SASALT V SE- AREA 1:1 TRENCH 4£b I XX MAYFLOWER MINE =m GREENSTONE Yl S W ORE BODY Nil WEST CENTRAL D-D H DIAMOND DRILL HOLE

MARBLE

2 EARLY SYENITE & DIORITE

TOPOGRAPHY 8Y GEOLOGICAL SURVEY

Figure 3. - Mount Andrew geology, topography, and workings.
R.I. 4129

The Mount Andrew ore zone has a general north-south trend and covers

an ares. roughly-"l000 feet long by 850 feet.wide. The ore bodies, for

reference purposes, are named and numbered as shown on figure 3.

Ore lenses are folded,'widenedi, and thinned, where dragged on faults,

or cut off abruptly. Lens thicknesses range from 3.to.100 feet and lengths

from 50 to 400 feet.

The larger lenses of magnetite to the south hayve combined thickness

of 100 to 150 feet and occur within a syncline about 500 fQet wide by 600

feet long. Malnetite outcrops are found in the south area and around the

Mount Andrew mine workings, but on the west flank of.the ore zone a large deposit was encountered, in drilling 45 to 115 feet below the surface. The

structure is contorted by a series of small folds and faults and is flanked

on the east and west by eharp anticlines. Along ihe ifeq% .jtank of the west

anticline lie ore bodies which were partly explored by .pore drilling by the

Bureau of Mines in the summer of 1944. Moderately high positive magnetic

anomalies outside the drilled area'indicate the presence of.unexplored ore

lenses,. reas.i.n. which the..dip needle map shows p6oitive readings of more

than 200, have possible ore reserves at depths of 200 to 300 feet. There

are also small magnetite outcrops.

Other ore bodies considered are..the Mayflower group, -ore remnants around

Mount Andrew main workings, a lens of ore outcropping at the portal of the

main tunnel, and magnetically indicated ore bodies and outcrops lying northeast of the main workings.

Magnetite deposits that could.:be worked in conjunction with the Mount

Andrew ore bodies include the Mamie and Stevenstown, the location of which

are shown in figure 2.

TRENCHING AND CORE DRILLING

Trench Sampling

During the period November 1943 through January 1944 and.during the

drilling program of 1944, nine trenches were dug and the exposed magnetite

was sampled. Underground and check sampling was also done, all of which is

summarized instable 1.

A total of 2,476 feet of trench was excavated in preparation for sampling. Results of channel-sampling and logs of exposed material are summarized in table 2.

1783 -7 7 
. .I.. 41?9

TABLE 1. - Number. and.combined lengths of trench samples

: '. .. '..N~o_,.of . { ,;+o Sampled:.,

original check I length, Type of

,Locati-on.. . . .splee .1es. TotU| tal. feet * 

Trench 1 Bast ....... .2n.. 13- : .3. 226.5 p Chanel

Trench 1 West . 10 0 10' *6. .! Do.

Trench 2 East ...... 22 5 27 194.0 Do.

-¢ Trench3,.. &W. .*. l.4 . 0 :,14 ,10140 Do. ,,, Trah J4West ....... 15 .. ; 135.0 gDo,.

Trench 6 . 4 3 l 8 07 , Do

TrenchEst..... ,.1,0, .8Q~. 1 6.1- Do.

,Tr Acpr8, W -es,..... , 4 0 , 11 . 90.0' Do.

Trench, , ... .. 2 13 103, 5 -fDo. . Tren h; .- 8, . 0 °8 . 8 Do.

TreripchC. . o ,1 1 0 11 95.5 -Do

SQuth drift. 6 0 6 448 Do

.,C4Lif Hrift r4 . . 17,0i Do.

Total .151 ; 2° 18291 i.

TABLE 2. - Trench-seap1d result

Trench f. YEast

Station 0 at 6cQrd.inate 10347N. Andd 5387E.; beat-in',.e~t,

length, 435 ifeet

Poot a : -:'. Per ent

F*riom Feet :pF Cu F.ornbtion '

iO - -18 18 i 46.4 j 01 @gttt 18 21 | 3 - Greenstohe

21 31 1 , 10 1 51.6 1 .05 Magnetite

31 41 lo 1 ., - Diorite

41 58 17 53.2 42 Magnetite 58 77 19 .. :..--e t 

77 107 30 . 51.8 .35 Magnetite 107 :-126 . 19 - Greeriton

-126 - 131 : F 42e. . 22 Magtlte!

131 V . 155 _24 - ; _ 'Greeristone

155 176 I 21 1 58.8 .241 magetiter.. 176 251 !G75 ! _ _ reenstone

251. - 255 ' 4 1 - - Syenlte . 255 - 8 | 25 39..6 .13 - M neite - 280 289.5 1 9.5 ; - Bbatbrdte - 289.5 306 | 16.5 56.1 .13 MagnetZ te

306 333 27 - - Syenite 333 355 22 36.4 .04 Mag. & gr. 355 361 6 - _ Diorite 361 377 16 - - Greenstone

377 407 30 55.5 .01 Magnetite

407 416 | 9 | - Greenstone

476 423 7 6o.6 .05 Magnetite

423 432 9 . - Greenstone -:

432 435 1 3 - - Magnetite

1783 -8-
R. I. 4129

' Trench..I -- ^;

Station 0 at coordinate 10346N. and 5386E.; bearizig, w(t;-

1e~~~~Th~~~5~~~eet ~~~- ''-' . .... ,.......

::t-i5 I "T T ;; Perc ernt __________

From *4 J Feet - . .___CU________

0 . .:- D1idrite;

124X- -: 166.> . 42 46.6 0.26 Magnetite

166 . --.178 .1- i2 _ . , _ ' Diorite.

178 1.92.,' 14 47.4 .77 Ma~ittite

192, 198 .6 _ . DiQke,

198 208 10 53.4 .59 - netlte

208 214 6 - - , Diorite

214 '228 11 57J14 .38 iagnetite

228 . 10 - _ Greenstone

Trench 2

.~~~~~~~~~~~~~~~~

Station G0at coordinates 10213N. and 5196E.; bearing,-0.-790 E.;

14~8 feet, thence east 272 leet - '

_______ _________ Feet 1 P ercent

From . To _ Feet Fe Cu Formation

0 23 23- _'' Oi:' eonstone

23 55 12 - . Diorite35 71 36 59.3 0.09 .. Maietite-;-;

71 . 2 ...--- , _ . Syent112 - 122 :56.6 1 - r .02 :. j a~gnetite-;

122 32- ,15D - Diorite

154 i8- . 28 4. . .12 Magnetite

182 -:`222 4Q, _ _ Diorite :

222 - 313 91 44.5 .03 Magnetite

313 521 8 - - Greenstone

321 33°0 9 61.4 .02 Magnetite330 334 4 - : Diorite :

334 344 10 59.2<. .11 Magnetite

344 . 354 10 24.8 *04 - :

354 .3 .6- 22:Geenstone

376 396 20 _ B Basalt

396 401 5 -58.0 ... Maiptite I 

401 - 420 19 . - Greenstone

1783 -. . .. .... .. 9 
R1.I. 4129

Trench 3

Station 0 at coordinates 10109N., bparing, S. 66° E., length 253

feet; 5631E., befarinS, N. 66°W y *ngth 59 Ieet

Footage p '| Peret,, Io-o ,!x0 

From From ~~To J =, eet 'Fe j ' For t.1Q Cu ... om Qfn59 W. - 55i86 .- O 11 1 Magnetit-O'

51 W. 47 W. &; entn

47 W 1 42 W. -- 0 ; -:r.* f9nt

42 W. 1 7W - 5 ' - 1 ' iorite-syenite

37 W. j 25E. -,'.2 62 . - 4reenstone

25 E. i 39 E. 14 54.7 .O 051,Egnetite . 39 E. 48 E. . 9 .' Ir -_eenstone.

48 E. t 74 E. 26 . 64.7 V .07. 1 agnetite

74 E. 84E. ., 10 -.i -'_ Bostonite

84 E. 131 E. 47 56.6 ,07 Msagnetite

131 E. 134 B. E 5 - . .3- Gr . 8 inag.

134 EB 162 E. * _28 1- Kr-j Iyenite

162 E. 188 E. I- te

188 E. 192 E. 4 .>.r .07 j Magnetite

192 E. 195 . 3 - Mag.&gr.

195 E. 213 E. . Diorite i8 

213 EB 253 40.° _ _ . -yiite

Station aab' 02i5S. coorinatem and5I a .,~baring N.32° 30

E.; length 262 feet -. - To Feet Fe'

Foota~ - e_ : erc't V.. ;........

From, I To : ..Feet Fe ' Cu Formation

O d .: d T f 49.9 0.05 ;Magnetite

8 1 99 .91 .: -* - I Greenstone

99 123 .. 24 56.2 | o6 1 Magnetite 123 -10 .7 I - . - . Greenstone

130 168 : 38 48.5 ! 05 Magnetite

168 187 19 .- - I - O 'reenstone

187 234 : 47I 56.7 .18 'Magnetite

234 254 20 - 22.5 l.lb 4ag. & gr.

:4 _...z.... 264 10 -, .~; . ,;'Ieenstone Q.;. 

T;hIench I6 ' - ~ ~ ~ ~ ~ ~ . ~ ~ ~,. : ;

Station 0 at coordi~tes i1001j).elc Bi.; bearing, S. 77° 30'

*B; length, )i0 feet . I 

Vootage i Percent

From 1 To Feet Fe Cu Formation - _- ; Greenstone

18 30 12 - _ Syenite

30 50 20 - I - Gabbro

50 60 10 58.§ f 0.08 I Magnetite 60 72 12 -_ - Gabbro

72 100 28 j56.3 I .05 Magnetite 100 110 10 [ _ . - Syenite

1783 _ L _
R.I. 4129

Zrench, 8

Station 0 at coordinates 10448N. and 5586E.; bearing, E. 170';

W. 0.- 17' (offset 45' N.) 17 - 103' (offset 42' s.) 103 - 143';

(offset 34' N.) 143 - 198'; lengths 381 feet

Foot e Percent

From j To - PoFeet e Cu . -ormtion

211 w. 184 W., 27 - I - Syenite

184 W. 171 W. 10 58.9 0.09 Magnetite

174 W. 162 W. 12 _ - - Diorite

162 W. 158 W. 4 64.8 l .09 Magnetite

158 W. I 153 .W.. 5 . . Diorite

153 W. 103 W. 50 47.0 .12 Magnetite

103 W. 63 W. 40 - - I Greenstone63 W. 47 W. 16 59.5 .91 Magnetite

47 W. 142 W. 5: - Greenstone

42 W. lO W. 2 _ Gabbro

10 W. 70E. 80 55.7 .7 Magnetite

70 E. 84 E. 14 . - Diorite

84 E. 96 E. .12 62.0 .22 Magnetite

96 E. 111 E. 15 _- I Greenstone

111 E. .119 B. 8 39.4 .19 Magnetite

119 E. 135 E. 16 _- Greenstone

135 E. 170 .: 3 5 - Bostonite

Trench 9

Station 0 at coordinate 10244N., bearing, 0 - 141'E., S. 770 E.,

5675E., bearing, 0 - 73W.; N. 77 W.> o length, 217 feet

FootaFe l j Percent F

From. To - . Feet e I Cu Formation

-73 W. .7 _ . -_ Gbbro

66 w. 61 w. 5 - - Mag. & gr.

61 w. 50 W 11 i _ . Gabbro

50 W. 47 W. 3 Mag. & gr.

47 W. 15 W. 32 ! Syenite

15 W. 10 W. 5- . _ _reenstone,

10 W. ;1.5W. . 8.5. 56.9 | 0.14 Magnetite

1.5 W. .0.0 1.5 - I - Greenstone

0.0 11 E. 11 i 62.3 .13 Magnetite

11 E. 26B. E . 15 Greenetone

26 E. 29 E 1 3 - Magnetite

29 E. 59 E. 1 Greenstone

39 E. 75 3. 162.9 .05 Magnetite

75L. 78E 3 - _ Greenstone

78 E. E .1 . 48 126 57.4.09 Magnetite

126.E. 144 E. 18 l[ _ - Gr. & slide rock

1783 -11-
R.I. 4129

Trench "B'

Station 0 at coordinate 5231. E., 0 to 80, bearing, S. 110 W.,

10326 N., length, 80 feet

Footage . Srent

From To Feet E .Fe_ Cu .ontion 0 

0° 0 g 80 l 45.7 so 0.1 | Magnetite

Trench "0C

Station 0 at coordinates 10295 N. and 4948 B.; bearing, S. 230

30' E.; length, 165 feet

Foota e Percent

From To Feet Fe Cu Formation

F6 - 6 . .enite

6 59 33 26.9 o.o6 o r. & mag.

39 47.5 8.5 . - : raenstone

47.5 70 22.5 45-7' .09 Magpetite

70 78.5 8.5 .reenstone -

78.5 .126 047.5 52,9 .014 Mgnetfte

126 141 15 . _ -1 .eenstons

141 146 5 - _ : Syenite

146. 152 -6 - - _ eenstone

152 155 3 . - . . Magnet.te

155 165 10- | - Greenstone

Core and Sludge Samling

Between'March and SeptemberI1944 the Burea'A"cf Mines-completed 17 coredrill holes to depths of 115 to27;0efeete.fggregating 52t7.5:ieet. The drill

frequently encountered "fracture -zone and. oavities in the r~ock which resulted in the loss of drilling water, caved holes, excessive bit wear, and

slow advnGe-iThe sanples were analyzed by the:Territorial Assay Office, Ietchikan,

Alaska, and Smith-Enery ICo., Los Angeles, Calif. 576 core and sludge samples

were submitted} all of which were analyzed for iron and copper. The iron:

content of sludge samples was genorally found to be higher then that of

corresponding core samples.

In parts of the drill holes where thc core recovery was 90 percent. or

greater, sludge analyses were disregarded, and the core analyses were accepted as representative ox the ore. If the core recovery was less than 90

percent, a weighted average was made of the core and sludge analyses in accordance with the ratios given in the Longyoar table. Core and sludge analysee, and core loge are sumMarized in table 3. Tho location of drill holes

and trenches are ehown-in figure 3, and sections on lines of holes with .average sample, analyses are shown on figures .4 to 15 inclusive.

1783 -12-
80.2 0.35

\ 44.1 0.70

141572771S _ .

I~~oo~ <& 1 . oy Hz.. V40

1 ;

o M IvOUNT ANDREW MAGNETITE w >BLOCK AREA PERCENTAGE

A . K . Lo! 14.............___SQF.. FteE Cu

P 4210 4 7.5 0.18

LEGEND Q 2560 57.6 0.53

R 2560 58.0 0.32

,ia MAGNETITE Z LOW-GRADE MATERIAL S 1680 54.2 0,63

=GRE ENSTONE GABBRO T 80 35.8 0.34 U 810 58.2 0.42

L~IF ISYENITE SBOSTONITE 0 so 100V 3260 38.3 0.0 6

FINDIORITE 1 OVERBURDEN 0 _0 5 TOTAL 15160 50.3 0'30

SCALE IN FEET

Figure 4. - Section of ore body 1, drill holes Al and 14.
ORE BODY BLOCK AREA PERCENTAGE

SQ. FT. FE Cu

I 36.0-77Z5 2240 52.9 0.04

180.0 -20 2 700 35 5.6 0.03

Y _____500 __

1400

ORE BODY V O RE BODY I

I > ' (.J~t;t<

/h.4 : ,Xo> * >>>Fxs . ;R O, E BODY m '1 'b *.. I 1300

.N ; Iwe. I

LEGE A4, ND I

0.05 ~~~~~~~~ITI ;

MAGNE:TIKE >^ SYCNITE

|Z OREENSTOtNE |','- EARLY DtORITE AND SYENITE

LO W-GCRAD E tMATER IAL

o 50 100 ISO

SCALE IN FEET

4~ ~ ~ ~ ~ ~~~~~~~41

MOUNT AN DREW MAGNETITE

Figure 5. - Section of ore bodies V, 1, and III, drill hole A2.
R.I. 4129

TABLE 3. - fifl-hoe.~ Ie results

TAMe ]J R1)A (3. 

.Projpect 927; Mount Andrew, Ajaska; dip , 051°; length, 173.2';

coordinates, id389.5 N., 55ng0 .. elov..-415 ±£eet bearin,

W.; dates drilIled, April8-1` , 1944 . .

'POOF F-. 6F P erent

Feet Fe Cu Fornation

o. : 2,5 2.5 . - 0 Oveburdbei

2.5 7.7 5.2 27.7 0,15 Mag. & gr,

.74:7 14.5 6.8 , . Greenstohe

14.5 -g19.0 4.n5 44.1 .70 : jMetite

19.0 29.5 . 10.5 18.2 35 r. & .

29.5 60.2 30;7 54.2 I .63 Magnetite

60.2 63.0 2.8 1 Greenstrtne

63.0 -69.o0 61.o0 Boetonite

69.0 105.8 36.8 58: 0 *32 Magnetite

105'.-8 .121.5 . 15.7 . - - Dirit&

121fi.5 128.8 7.3 161.8 . . *85 : Magnetite

128.8 133.8 5o.0 . _ Greenstone

133$ -8 - 142o.0 8'.2 53.9 .24 Magnetite

142:.0 162. 0 : 20.0 . . Diorite

l162.0 175..2 . . 5... .. 8 . Magno1

HIol-e A2 ('igi. 5)

Project 927; Mount Andrew, Alaska,; dip, -450; length, 208*.0';

coordinates, 10058X0-Nef,j 5417.0 E.; elev., 1,540 feet; bearing,

S. 80 E.; date0 dri lled,. Juno 6-16, 1944.

Percent

from To _ Fee. F: :_ __________

.O. 0 . Syenite: & gr.

8.0 i3-55 5.5 'I' - Ooentoizt

13.5 15.0 I~15 15 |53. 6 0.Mnette Mag02 Oenetitle

~15. 0 36.0 21.0 Greenstone

36.0 77.5 4l. 5 52.9 .05 Magnetiteb

77.5 . 101.1 ' 25.:6 1 . : Diorite

10i. 1 135. 0 33.9 24.1 .02 Mag. & gr,

135.10 159.0 24.0 .. - . _Greenstone

159.0 161.0 2. 27.5 .02 Gr. & me,

16i.o0 180. 19.0 - . . Greenstbne

180. O 24-.5 24.5 35.6 303 Mg. &gr.

.. 2Q4i.5 ... 208.0 3.5 | - Syenito

1783 -13-
R. I .42

Project 927; Mounlt Andr e _ 9 3Q; length, 270.0',

coordinates 10441..0 N. 9(654. E.';" bea'rinej westk; elev.,

Foo ae +,p-Ie.oe. : -- 1,. - - . ..... ~, __ ...-F Re$. . .. . Cu Fe oti

23i °2 ~~~~- S- -81....... _3 . .. O. .:.*19 . l;

31.1 .. '60.10 .28.g I 42,.3 .- 52 -:ag . &-;r 60'.0,.O 69'.;0 . 9.0 - :.. Gabbro" -

69.0 --- &5O *1.O{'^45.4 . 41 ^M. .e

117. 03, 0 -,. >9. 0 '13.'2 ' 45 M 84.; ,0.Sagnet te,, 12$>~~~~~, 2i ; Gebbro. 24 2 _-;i. 

133!~ 2'! .!169.7 3 6 5 - 45.2 . ' 57 Mag wnetitf6-#

169 *7 1 75 *0 5 . 3 _G : (ab Drof' 175; ; s r221Lf 7 46. 7 ~. G s eenon 

221g,1 >*22)8.5 , 6.8 * 2 .2 ;'i. .31. r & g. 228.8 . .247. 7 . 1.... 92. 2 . , ,Gxefen& nof 247."g 5.' 8 08. .20. Gr. & Ida

20. Q ^.27c.. 2 , 2 2Gentn - . : 

269.2 1270.0 _! ~ ; 8. Gouge

¢ - ;; tawf~oev A4th 7; .fes "Ii 

Project 927; M4.:unt Phdr .Alapk-ar dip, 8;h if

; -sttw^.1029it1N.; 49>52.5 E.; b~earipg S. *6?7 :E;, ler.,

-10,7.6. 1,, dae.d, SJul 3 9 - fA isg7 f,33 ;

Fr '. ,;-i, To - Ye'et - Fe4 dl Cui. K;;Formati~on

,,go&T 0'" ?O ' '[ 2.o. ,> - l Oveb en

st o k .12.0 o i.0 o . Q yerita, .2'-O: 4'.: 28,o. ,0 '52#at, .i; 0. 02g ,...

, 4o0 . . 48.3. 8.3:-.-:. refch

+ tt.5: ,60.0p ^ 11., ; 18-3, o:. IOS. Gr'. .i

6- 85.8 2.8 29. 5,,._ .1) ' ag. gr . ;.45:.$;*:.0 93.8 ; ..- ';._ . .; eenf~n

:93481 . 97 .2 3.4- 37.°,. og , 'B125, 1635.0o. 6.0 ;_. ;._..>...

1783 ; -14 -
47.0

G ss~~~~~5.7 MOU NT ANDREW MAGNETITE

_0= ~~~~~~~~~~~~~~~~~~~~~~~~~

SYENIT E ORBODY LOCK|

GcABBRO B 2230 59 5 __Q.9 I

| | CREENSTONE 4 ^ l ~~~~~~~~~~~C 40 20 4 8,7 0.5 4

N 78°Wi - 5v / } l ~~~~~~~~~~D 3780 4 8.7 0.66

MAGNETITE t mz/H OLE A 3 I A 14 20 4 7-1 0 24

:flLOW GRADE MATER IAL . IE il0 soa 02

/ §, I ~~~~~~G 12 70 50- 1 0-14

SS @ N Ag 6 700 3 9.4. 0.19

@( l ~~~~~~~T OTA L 179 80 49.9 10 4 7

Figure 6. -Section of ore body 1, drill holes A3 and 7.
9~~s v 1 

1 4 0 0 i 1 2 0 0

0 06 : 0.0: BLOCK AREA PERCENTAGE

~Z Ix u~~ -.... *''* 12.0 -40.0 1850 40.7 0.12

~~ - ~ ~t60.0-85.8 3920 44'. 08

T - ~ ,)C TOTAL 5770 43.4 0.09

1300 ~~~~~~~~~~~~~~~~

4 7 5 67 E

1200 ~~~~~~~~~~~~~~~~

E:MAGNETITE MOUNT ANDREW MAGNETITE

771LOW-GRADE MATERIAL

0 50 100 IS0 [' AsAISYENITE I

LIII GREENSTONE SCALE IN FEET

Figure 7. - Section of ore body VI, drill hole A', trench C.
ORE BODY BLOCK AREA PERCENTAGE

MOUNT ANDREW MAGNETITE i SQ.FT. FE CU

v I A 9900 44.5 0.35

OR E BODY 'ZI VI B 2870 485 0.05

ORE BODY o TOTAL 12770 45.4 0.28

1400 T\oo. a hi _ 840 56,2 0.06

14.

_N 36W w MAGNETITE |T SYENITE T S 36 E

LIII GREENSTONE W~3\jODBOSTONITE

|::: :|Low-GRADE MATERIAL

0 s0 100 SO0

SCALE IN FEET

Figure 8. - Section of ore body VI, drill holes A5 and A6, trench 4.
R. i. 41 P9'

Hole--A-5-(f ig. 8.)

Project 927; Mount Andrew,'AJ~sL~a; duip, ~-580;.length, 166.01;

coordinates; 1043.54.5 N'., 5057.5 E.; beea~ing, S-. 560~'E.; elev.,

1, 4 13';dates drilled', August 8 - 5~, 19414

Footae I. - Percent --

From. ... Jj TQl J ~et .C-.Fe [. - T ormation

0.0 12A ~ .0 Overburden

2.0' - 9 .0 .7.0 -- I Gr'eenstone

9.0 10.0 1. 0 - - Bbtonite

10.0 1-6.5 6.5 - -Greenstone

i6..5 55.0 38.-5 17.5 0.0 Gr., & mag.

55.0 116.17 61.7 I.1. *27 Magnetite

116.7 145'.0 285G-0reenstone

145.0 164.0 19.0 15.6 .08 Gr. & mag.

164.0 164.5 .5 .-- Bostonite

164.5 l66.o 1. 5 - - roenstone -

____ ___ __ ___ ____ ___ ____ ___ __ _ ___ ___sote bostonite

-. R~~~~~oIG A6,.(f'ig. 8)

Project 927; Mount Andrew, Alaska; ..di;, .16o-1/20; length, 114.5';

coordinates., 10454.5 N-.5057.6 E.; bearing, N. 360 .;elev.,

1, 413-';dt rlled,' August 15-18, 1944

Footage ~~~~ercent

From.~.. -To . Fe F~e ... Y...~C oimtion

0.0 ~ 2.0 2.0 - ..1 - verburden

14.0 .~-7,0 . 0 23. Gr.&ag

16.0 I 20.5 4.3 - Bostonite

20:5 2.2 1. .105 6 Gr. & mag.

0.5 V 52.0 10145 -- Oontn

52.0 ~ 6o. o 8.0 17.8 A1 Gr. & mag.

6o~o73.0 13A0 - areenstone -3.0 76.5 55 493 75 Mag. & 8r.

76.5 .' 79.2, -2.7 12.1 -;O7 Do.

79.2 ~~96.0 ,' .16..8 - . - reenotone

96.0o 107.0 11.0 40.1 .16 mag. & gr.

107.0 110.3 5:.5 3 27.6 -. 07 Do.

110.5 114.5 4.2 -.- Syenite

- ...........

S .- -
R..I. 4129

Hole A7 9)

ProJect 927; Mount Andrew,' Alaska; dip, -900; length, 195.0';

coordinates, 10779.3 N.., 5007.5 E.; bearing--; elev.l,4 89.0';

dates drilled, August 19 26, 1944

Footage Percent.

From To Feat Fe ' . u' - Formation -

9.0Gr .m'' 0 5 1ag70.r0 

9.0 20.0 11. 0 ' - Greenstone

20.0 23.0 13.0 .13.0 Gr. & mag.'

23.0 30.5 7.5 l _ Greenstone

30.5 '45.5 -15.0 i 15.5 .12 Gr. & mag

45.5 ' 75.5 29.5 | - reenstone

75.0 80.0 5.0 1. 28.0 1.40 Gr. & mag.'

80.0 90.0 10.0 j - - Greenstone

90.0 .120.0 .30.0 17.8 .. 6 r. & mag.'

120.0 131.5 11.5 42.4 I 1.37 Magnetite'

131.5 140.0 8.5 | 15.9 .26: Or. & mag.

141AQ' 183.0 43:0 42.6 .88' 'Mgneti e' '

183.0 195.0 12. 1 .18- O.-"&-mag. -

Hole A8 (fig. 9Y

ProJect 927; Mount Andrew,.Alaska; dip, -75°; length, 179.0';'

coordinates, 10852.1 N., 4931.0 E.; bearing,:'N. 5° - 18'.E.;

eley.,. 3.,492.Ot; date drilled, August 27, September 1, 1944'

-Footo ej Percent:- *

From To -Feet r Ee Cu' Y''Frntiof

0;0 - ''30.0 -30.0 [ - - Greenstone

30. 0 61.0 31.0 17.1 0.37 .Gr. & mag.

61: ;O 70. 5 9.5 . 56.8 1.67 : Magnetite

70.5 74.4 3.9 -_ _ Greenstone

74.4 120.0 '.45.6 43.2 .14 Magnetite

120.0 ' 145.0 25.0 - . - reenstQne

145;0 - 175.0 .- 30.0 o: 35.0 .3, .Mag. & gr.

175.0 179.0 ; 4.0 - Greenstone:

0 ~~~Hole',.7 .(:f ig. 63.

-Proect .e.t. '927, Mount AndrewJ Alaska dip, .-40°; length, 242.7'

coordinates, 10495.0 N., 5396.0 E.; bearing, S. 85 E.;

elev., 1,408'; date drilled, April 19 - May 1, 1944

Foot e [ Percent

From To Feet Fe Cu Formation

0.0 8,5 -5 Syenite

8.5 11.0 2.5 _ _ Diorite

11.0 77.0 66.o - - Greenstone

77.0 87.0 10.0 48.2 0.52 Magnetite

87.0 27-0 10.0 - Greenstone

1783 -16-
F~~~19 DDNO A i.5wo DD N5O. 7 46

|--~ q ~ LOW-GRADE MATERIAL4l

I -

Figure~~~~~~~~~ 9. V -I dilhlsA SetoA-oebd n 8

35 ~~~~~~~~~~~~~~~i.

1300 1.40 A 4-08 

'I 4'~~~3 0 _ _ _ __ _ _ _ __ _ _ _

N35"IBE~~~~~~~~~~~1. N430 36EM AG NE T ATE ______________~~~0-5

GREENSTONE~~~~~~~~~~~~~~

1 T, SY IT 13 05000IOFE

I-0w-GAADE MATERIAL

f/vBO STON ITE mOUNT ANDREW MAGNETITE

Figure 9. -Section of ore body XV, drill holes Al and A8.
R.I. 14129

Hole 7 ( :g6(c-i.Lonuhued)

Foot~ge.^ ., ,:il:,, ~ I Percent

From :eet_ Fe , . u. I Formatlion

97.0 98. 7 1.7 400 . 3('et Magnetite

98.7 ,10 .. 7 T .10.0.. IG I . . reenetone

108.7 120.0 .11.3 . ..:46. 9 .55. - 4nebite;

120.0 1G8a2 - 18. . - - - -- Gabbro

138.2 '1143.0 4.8 54;0 V .90' Magnetite

143.0 146.0 ' 3.0 . , Grbenstone

1i46.0 146. ' 242.7: ,7 96.7t 48.7 ,, 1 ..66 Masnetite

Hole 14 (fig. 43;)

Project 927;, Motuit Andrew', sAlaska; dip, -50°; length, 180.8';

coordinates, 0o389.5 N., 5545.0.9.; elev., 1,415'; bearing,

east; -date drilledj Moerch 529- April 18, 1944 , .......... . . - ..... . . F ., 

Footae Percent

From To I Feet F1- e F C u Formation

0.0 4. Overburden

4.0 f 7.0 I, 3.0 i 49.9 0o.66 ' Magnetite

7.0 ' 26. 19.0 1- Greenstone

26.0 29:0 3.0 24.6 - 20 j M. & gr.

29.0. S5.1 58ir2 . ..42 Magnetite

38.5 i 59.7 .21.2. : + --:+ .!- - Diorite porph.

59-7. . 71.1.. .J11.4 ! 14..4. . 5 . .56 Gr.*& mag.

71.1 80.0': 819 1 Greenstone

80.0 I 85.3 1 :. Gabbro . 48 53,

85.3 90.8-, 5.5 244 .15 Gr.& mag.

90.8 1 94. o 3.2 ! - Greenstone

94.0 111.0 . 17.0 _ j Syertite

111.0 116.5 .5 40.2 .02 Magzetite

116.5 123.3 6.8 _ I .- Oreentone

123.3 137.8t' 14.5- _ I Diofite

137.8 ; 144.0- 6i'2 Greonstone

1414.0 151.S,0 .. ... 7,0- i 36.9 .09 Gr, &mag.

151.0 , 166,2 .15.2: - - Greenstone

166.2 175. 0 6. . .. 43. G.r.& ,88. mag'..

).75 .0 177. 2 2.2 _ Greenstone

177.2 180.8 3.6 " ' Bostonite

1U78 ..

t ' ' .% .F v ,O ' 

:.' ; ''' ,. , , ; ' ',.

1783 ~ ~ ~ ~ ~ ~ ~ 17 ' ,. ' ', '''
R.I.. 41?9

Hole. 20 (fig. -to)

Project 927; 'MbuntAndrew, Alaska;ladiM ,'-90I ; lIntth, ?5O.9;f

coordinates, 10358.0 N., 5442.0 E.; bearing,--; el 6v.,''1,422'2 :

date's drilled:, July 19 -'28, 1944

Footage : ; 'Percent

From *To Feet Fe o r [ Fration

0.0 1 .0 7.0 53.0 f b5 1Mgnetite

18.0 1159.5 141.5 - I - Diorite

159.5 166.0 6.5 49.4 4 1.21 Maghetite

i66.-0 188.4 '22.4 4reen' - stonb

188.4 190.8 2.4 ' 35-9 .92 Magnetite

lQ0.8 202.2 11.4 . .. Greenstone

202.2 204.0 1.8 : 6.4 i. 4? Mag. & gr.

204.0. 215.0 11.0 I - , Greenstone

215.0 216.5 1.5 30 (est;) 1.(est. Gr. & mag

216.5 | 250.9 54.4 -- Greenstone

Hole 23' (f ig. 10)

Project 927; Mount Andrew, Alaska; dip, -450; length, 130.2';

coordinates, 10333.0 N., 5719.0 E., elev., 1,372'; bearing,,

N. 890 - 30' E.; dates drilled., June 30, July 4,21944

Foo Percent. ' From i 7 TTo Feet FU_ Formation.

O.O T . 3.5. 3.57 Overburdel3.5 5. : 30.0 .. 26.5 54.4 1 0 0.53 Magnetite.,

50,0 - 32.0 2.0 - . _ . Gabbro

32.4: . 45.0 13.0 1 - ' - Greenstone

45.0 50.0 5.0 37.7 .30 -Mag. & gr.

50.0 . 55.0 . 5.0 _ - .18 Greenstone

55.0 77.0 22.0 . 50.1 .34 Magnetite

77.0 83.0 6 0 . - . Greenstone

83. ill. 0 28.0 39.7 . .45 . Mae. & gr.

lllvo - .19.0 B.o O . Diorite porph.

119.0 125.0 : 6. o 29.7 .29 - Meg. & gr..

125 0 .150.2 5.2 a a.

'Hole 27 (fig. 11:

Project 927; Mount Andrew, Alaska; dip, -45-1/2°; length, 222.0';

coordinates, 10211.5 N., 5462.5 E.; elev., 1,398'j bearing,

west; dates drilled, May 2 - 13,'1944

Footage Percent

From To Feet Fe Cu Formation

0.0 19.0 19.0 39.1 0.05 Magnetite

19.0 31.0 12.0 - - Greenstone

31 .O 36.o 5.0 48.4 .o4 Magnetite

3.'0 48.5 12.2 _ - Greenstone

1783
.6 0.130./ H57~~~~~~~~~~~~~~~~~- 42.8 I -I* ***'.

*_,? ~ ~~~~~~~ ~~~~~~ TON /NRE ~ '9 7~ / 5ET

- 1--. 49 4 4' -QSZ - XI.' '-8;'- ' T HO E2/%oa

-I m 1 ,

WEST I :15. ORE BODY BLOCK AREA PERCE NTAGE F. ____U_,;

WEST__ Y_______-__.92 SQ.FT. FE CU BLOCK AREA PERCENTAGEI

- g \ - -;;b; iI F 4080 43.6 0.11 ____SQ.FT. FE CU.

1200 _______4 L 260 53.2 0.42 3.5- 30.0 730 46.2 0.31_

\ tl.42___ G 4960 51.8 0.3 55.0-77.0 1900 *532 _0.l4

\ ~ , ~ ____ 260 4 2.8 0.22 B3.0 - 11 .0 3 00 3.8~ 0. 36

\ \ I____ H 2730O 5 8.8 0.24 TO TA L 6330 46 9 O0.29.

\ \ ~ ~I N 1150 39 6 0 13 LEGEND

________TOTAL 13,440 49.5 0.23 EMAGNETITE |/jj'ai'l BOSTONITE 0 50 100

| _ ' _ ~~~~~~~~~~~IZ|GREENSTONE Y DIORITE

SCALE I N FEET _____ 0 4310 56~ I 0.13 ITTTISE T

Figure 10. - Section of ore bodies 1, 11, and IV, drill holes 20 and 23, trench IE.
1400 4 8.4 39.1 378 >28

ORE B yy 1400

.75 ~ ORE BODY E

+ 424- EA ST

W + .0.00 A+ 

-4 + 1.1 BLOCK AREA PERCENTAGE

4 l*, 4 | 3 FE CU

_4_ 792 44h 0.22

Fiur 11. - Sectio or0ois n , rl3ols2,236n 1 36f 

~~ I 64 l~~ Q3 ~~~~ ~~ q. '~~ F 97280 45.0 0.25

_t OL3 2 0 ~~~C 1960 428 0.08

i 4 I-~~~~ 25.7 x l.* o~~~~~ -~~ 1200 ' TOTAL 20880 46.1 0.17

I4- 4- +F 4 4 z + ~ ~~~~~~~~~'LEGEND

x M~~~~~..fMAGNETITE +DIORITE

to 30 =G~~~~~~~~~~REENSTONE FTT 1

7 SYENITE

SCALE 11N FEET [=LOW-GRADE MATERIAL BASALT

26 7*0 MOUJNT ANDREW MAGNETITE

Figure II. - Section of ore bodies I and V, drill holes 27, 29, and 31.
P.i. 14129

Role 27 J(f ~g. 11) .(Continued)

Fpota Percent

From To 2 Feet Fe.* u Formation48-5 7 ~~~53.3 1 0.2 ' netite

-60. 105.0 14-8 4 -Greenstone

105-Q 1) -Do.

.105.0 A 9 7.0 )~3 4 .13 .Magnetite

119.0t 121.0 0- 7 I Gentn 11.0 12. 1 72 39.9 .6 -Magnetite.

128.,2 I 146.9 18.7 - -Syeni~te

146.9 i 6.0. 1, .51. .2 Mgeie

16o'. 0 183.6 23.6 !. - -Senite

183.6 .187.7, 4.1 2.1 .15 Ma1g. .& gr.,

187.7 1]91. 4 I 3.7 -- I G~reenstoiie

191.14 .198:5 7.1 205.7 .014 I Iag. & gr..

198 .5 :-:200.-3 1.8 - G-reenstone

200.3 200. .14 37.2 .. 48 I Mag. &gx;.

200.7 205.1 14.4 I - I Greenstone

205.1 206.0o .9 14o.o T....est.!YMagriet'ite

206.0 2 Io 0.0 14.0- Greenstone

2100 219.01 9.0, -iorite D & gr.

219.0 222.0 1 3.0 -- Gray71 clay og

Hole 29, (tg ,11)-

Project 927; Mownt Andr'ew, Alaska; dip., -909;..1erngtyi 2 67.0?;1'-

coordinates 501... 516. E be~aring,--;-elv. 398.0.';

date8 dI'i1Ied, May 25, June 5, 191414

*1~~6ote~~ge Percent

From :To Feet 'Fe.j Cu j Formation

0.0 45.0 424 0.108 1 Magnetite 145.0 [ 55.0 10.0 22.2' .14 NMa.& r

55.0 13-.5.5 80.~ 148.,9 .17 Mgnetite

L35.5 1141. 5 6. - Gr4~enstone _.,--

1141.5 '150.-~0 I 8.5 ~ 55,2_. .21 M~xieite

150.0 - 160,0',: 130.~0 -- Greenstone

16o.o, 175.0 1 15.0 36.14. :.39 Ma. & gr.

175.0 197.0 22.0, 19R.0. ,.32 Do.

197.0 . 2014,5 7.'5 61'.14 .314 Magnebtite

2014.5 _215.0 Q- 10.5 - -Gr eonstone

215.0 '225.8 10.8 143.7 .29 Magnetite.

225.-8 230. 0 14.-2 -- Crentie

230.0 - .- 235-.0 5.0 ~ -27.7 .146 GI d I

235.0 -267 '.0J-~ 32.0-._ Greefistone

1783 -19-
R.I. 4129

Hole 31 (fig. 11)

Project 927; Mount Andrev, Alaska, dip, -47° 20'; length, 2Q2.0'.;

'coordinates, 10211.5'N'.,'5462.5'E.' bearing, east; elev.,.1.,398.0';

dates drilled, Mav 15"-'24, i944

Footage PercentFrom To Feet Fe - Cu ! Formation

°-Q 0- 1 1515.0 - Greenstone

1590 1 20.0 5.0 1 37.8 0.04 Magnetite

20.0 [ 25.3 5.3 1 12.8 ..0l Gr.'& mag.

25. ';46.0540o 20 547 '.16 Magnetite

46.o 9540.0 8.0 i 4 -Greenstone--

54.0 90.~0 36.o | I 43.8 ..13 Magnetite

90.0 100.0 10.0 - ' Greenstone

100.0 113.0 13:0 48.1 ..07 Magnetite

113.0 123.0 10.0 'l ' 7X~ - Greenstone.

123.0 175.0 52.0 43.2 .16 Magnetite

175.0 )186.o 11.0 21.7 .07 Mag. & gr.

186.0 191.5 5.5 1 - Greenstone

191.5 194.0 2.5 50.4 .07 Magnetite

194.0 202.0 8.0 - Svenite -

: :Hole 32 (fig. 12)

Project 927; Mount Andrew, Alaska; dip, -45°; length, 120.0';

coordinates, 10219.5 N., 5703.0 E.; elev., 1,343'; bearing,

S. 770 3Q' E.; dates drilled, June 26 - 30, 1944

Footage Percent'

From To F eet _ _Fe Cu FormatkQn

0.0 4. - - T Overburden

4.0 18.0b 114.0 o - Gabbro

18.0' 55 0 37 0 i 51.2 0.24 Magnetite

55.0 70.0 15.0 25.2 -10 Mag. & gr.

70.0 107.5 37.5 45.7 .16 Mag. & little gr.

107.5 111.5 4 .0 _ _ Greenstone

111.5 118.0 I 6.5 58.2 | .13 Magnetite

118.0 120.0 2.0 A O____ Greenstone

Hole 37 (fig. 13)

Project 927; Mount Andrew-, Alaska; dip, -59Oo30; length, 136.5';

coordinates, 10100.5 N., 5652.0 E.; elev., 1309';bearing

S. 670 E.; dates drilled, June 17 - 24, 19441.

Footage' - IPerdent

From ' o-- Feet Fe Cu. Forati.on :

0.0 .0 - Greenatone

8.0 19.6 11.6 |599 0.12 Magnetite

19.6 30.0 10.4 I - - Greenstone

30.0 40.0 10.0 52.1 .06 Magnetite

40.0 50.0 10.0 9.1 .03 Greenstone

1783 -20-
1400 1400

O RE BO DY

\ ~~N0.- ITZ NO0. II

13001

_____ _________ ~~~~~~~~~LEGEN1D

ORE BODY BLOCK AREA PERCENTAGE

S Q.FT FE CU 2. =] LOW-GRADE MATCROL

IV A 1540 55.7 0.13

1____ = = 200MAGNETITE II B 2 70 62. 9 0.05 1200 Mc~lr

II C 2200 54.7 0.16 MOUNT ANDREW GREENSTONE

Ir D 2990 45.7 0.16 MAGNETITE

II E 630 58.2 0.13 0 so 100

-- ~~~~~~~~~jI GABBRO,

.- TI rO TAL 6090 51.0 0-15 SCALE IN FEET

Figure 12. - Section of ore bodies IV and 11, drill hole 32, trench 9.
ORE BODY BLOCK AREA PERC NTAGE

SQ. FT. FE CU

\ 6 0.11 n - 8.0 -19.6 52 0 57.0 0.08

Os09 54.7 |I 30.0 -40.0 855 59.2 0.07

2 Q950.0 -96.0 2790 4 5.9 0.06

30 R117.7 -132.0 2030 49.2 0.14

lM 59. i st>>,^.______ TOTAL 8325 51. 5 0.08

; 1 200*.2,O.,.° m ____ 950 57.7 0.10 ORE BODY X. m*.*. *OR _ _

N 6 7 W .. 5./: 6___7__E

1200 F - A 20 5 00

, I ^ -ps, ,1~I 

-9.

O.* .-..

C i 1/ ~~~~~~~~MAGNETITE | t|DIORITE

GREENSTONE -- , SYENITE

0 SO 100 150 FEET | . | LOW-GRADE MATERIAL

MOUNT ANDREW' MAGNETITE

Figure 13. - Section of ore bodies 11 and III, drill hole 37, trench 3.
SErO 000N SCIN 00 SECTION 10800 N SECTION 10900 N

AREA ~' /AREA AREA

2800 SQ F T 1820 SQ.Ft\ r '\ 4 260 SQ. FT.i. 1380 SQ.F1'\ I

1400 1 v V A J \ 1400

A~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~'

13~ O STO O : W P ID II ,~ ~ AREAS

1300 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _1300

MAGNETITE

. 94 |CGRANITIC INTRUSIVES 0 so 100 150 FEET

GREENSTONE FE- 47.8 Ed CU- 0.32

NO SAMPLES TAKEN -ANALYSES ESTIMATED

MOUNT ANDREW MAGNETITE

Figure 14. - Sections of ore body XIV at 5200 E.
RAISES To SURFACE O _

6300 E

cI _

06 00 E _ _ _ _ __ _ _ _ _ _

S ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~~~~~AS

/,Z~~~~k X~ CT0~oo 

S~~~~~~~~~~~~~~~~~~~~~~~~

Figure 15. - Mayflower mine.
R.I.-4129

Hole 37 (fig. 13) (Continued)

Footge Percent .

From To Feet Fe CV''' Formation

50.0 96.0 46.0 45.9 '.C Magnetite

96.0 117.7 21.7 - : Gr'eenstone

117.7 132.0 14.3 49.2 '.14' Magnetite

132.0 136.7 4.5 . - . ' Greenstone

Figure 14 shows sections drawn from observed&tifheral occu±:rences in

the workings at the west end of the Mount Andrew mine. Figure 15 is a

plan Of th&Ma~yflower mine and adjacent magnetite outcrops. pla the .~ min .y .

The average analyses 'foz sulfur, phosphorus, 1imb, ifsoluble, gold and

silver were derived from composite samples. Analyses of composite samples

are shown in table 4 as follows:

TABLiE 4. Analyses of composbte satp1. .

Hole' Footae Pecentage Oz. per hort ton|

Hole_ Foot_ _ F e ' OTo L' - Au A Reimaks

Al 14.5-, 51.0 21.88 4.82 io.'56 Tr.1 Nil. 0.50 Sludge

A1 51.0_,790 j25.641 ;' 1.94' l41 Tr. Tr. .10 Do.

Al 79.0-108.0 13.58' 1.08 96 Tr. Tr. .30 Do.

A3 350. - 60.0 45-7 o.64 23.7 3.64 11.10 Tr. 0.01 | .30 .-Do.

A3 31.1- 60.0 39.2 .26 32.4 4.0 j1.18 Tr.! Nil. .40 Core

A3 69.0- 85.0 40.9 .33 30.9 il4.5 i .46 Tr. Tr. ' .20 Do.

A3 115.$-128.5 52.6 .51 14.8 1 1.3 11.8-l Tri. 0.01 .60 Do.

A3 133.-7-169.7 44.0 .57 28.4 l. 9 .821 Tr.! .01 .40 Do.:

A4 20.0- 355.054.3 .17 13.6 3.2- jl7 1 Tr.i .01 .60 Do. 55.0~~~1l6.7 ~ ~ 0 6 26 A5 550.116.7 43.7 .15 24. 0 .6 12. Tr . .01 .20 Do.

A7 110.0-170.0 36.8 .38 34.:5 5. .9-1 Tri . .02 .30 Do.

A8 80.0-120.0 43.8 1.50,21.9 i 3.2 5.1f Tr, -. 04 .50 Do.

A8 149.0-170.0 31.3 .26 28.4 11.4 | .37 0..,0OJ Tr. .90 Do.

7 146.0-242.6 46.4 .55 277.0 ' 15 1.021 Tr^.f 0.01 1 .70 I Do.

7 1466.O-250.0o 55 . .51 14.9 1.75 1 1.O0 ;Tr -i Sludge 27 15.0- 6o.o 33.81 5.55 {Tr. Tr.! Tr. .40 Core

29 100.0-135.0 56.o .24 16.8 3° I00 ? :Trj - - Do.

31 54.0- 90.0 44.7 17 27.7 2.45 I .10! Ti'J - - Do.

31 145.0-186.0 36.O. 131 39.8 6.90 10 Tr. . - - D o.- 57 46.5-132,0 45.1 .10 27.3 1 .r6 .10 T T. i 50 Do. 37~ 5 -4 ~6 1 - ; . --- r .5 Do,

Averf'age 3258 -3.5 .71 . /o11 O. 55 ' | 

1/ Per -lonig ton.;

Adjustod and. xighted. averaie-of all omples show the foloving

analysis:

1783 -21-
R.I. 4129

Percent

Iron .. A.. 47.8 ''I

.Copper ...- - - .32

Insoluble ...... 25.8

Alumina .. 4.0'Est.

CaO .......... 3.5

Phosphorus ..... Tr. to .01

Sulfur '..71 ....... '

Gold - .011 boii o . per long ton

Silver .55 oz. per long ton

Other metals reported in the magnetite deposits of Kasaan Peninsula are:

Cobalt, up to 0.05 percent; and magnesium, sodium, titanium, manganese,

zinc, nickel, strontium, chromium, and vanadiauiA in minor amounts.,

DEVELOPMENT

The principal mine workings consist of a group of four glory holes,

three adits, several winzes and a sublevel.' 'Development workings aggregat

about. )4,OO0 feet and are confined principally toithe north end of the ore

zone as shown in figure-3. 'The portal of'the'main a6it is at an elevation

of 1,3 fe'fet, and-the-sublevel is'50feet'lower. Thee upper adit is at an

elevation of 1,392 feet. The lowest adit, which is 1,525 feet in length,

undercuts the deposit at an elevation of 1,040 feet. Mine workings do not

expose the compound ore body south of the Mount Andrew mine except in one

glory hole at thQ northern edge-and-inma 12-foot adit in'the cliff on its

eastern border as shown in figure A.

The ore is hard and firm; the country rock, mostly greenstone and

diorite, is also firm, although it is cut by a few 'cracks', se'ams,- and

scattered small faults. Apparently no difficulties were encountered in

early mining, as the ground still 'stands well in open st'opcs 'up to' 40 feet

in width. Some timbering was done, although it was'confihed mostly to

drifts below shrinkage stopes.

There is no mining equipment aside from buildings alieady'mentioned.

The old tramway has been dismantled.

BENEFICIATION TESTS

Three samples of the copper-bearing iron -ore were submitted to the

Rolla laboratory for chemical analyses and metallur' e-,41.esting The samples, designated as Mount Andr-w.is. 4, 5, ane 6, were stated to represent

the ore reserves. 'The sample, Mount Andrew No. 4, was-blasted from the main

tunnel of the "copper-rich" area. The Mount Andrew No. 5 was cut from the

south rim of the glory hole near the boundary between the "copper-ricW'

and "magnetite-rich!'"areas. The Mount Andrew No. 6 was moilted and blaated

from the "cliff deposit" of the "magnetite-rich" area. A report of the

beneficiation test follows:

1783 -22-
R. I. 4129

Part 1. - Mount Andrew Samples 4 and 5

Physical Ch.racter ";'-

Thebores werolteveribed as near-contact replacement. of, limestone by

the ore minerals chalcopyrite, 'iagnetite, and pyrite and the.gangue minerals epidote: garnetsjpyrozene, calcite, and quartz. The orb, it is

stated, it -brdexed'by epidoti#d contact rock^'a&nd'ibt-.by diorite dikes. .~~~~~~~~~. . . :. ... -, .:.:.,;_:::

Microscopic study of sized-portions of the samples indicated a large

part Of t ggngus.ira~s were free at 6 5-meeh -but--t-het minuse.200-mesh

grinding'veuld7-be necessay to -give complete :liberation of the magnetite and If 'Ides. -

Chemigal Character

The a.nalyses for the major constituents r'eq~eted.by the engineer who

submitted the samples are:

Sample . Anay iS. percent

Description | Cu Fe ISi02Al20 '. S . OBO

Mount Andrew No. 4 O.'68 48.9, 1.5 3. 9 1.79 0.03 .0A

Mount Andrew No. 5 .'70I52.0i 9.93.5 1l.23 .02

Less-than 0.05 percento'ef each of:the fbllowTng constituents also

'were present: Manganese, nickel)'cobalt, zinc, tungsten, vanadium and

'titanium. ''

Treatment Procedure

The two samples were so similar, chemically and mineralogically, that

they were combined -for the .f.ollowviig..treatment:"

1. Flotation of copper minerals from the ore.

2. Magnetic separation of flotation tailing.

3. SinterIng-maghetic p6rtion of flotation tailing.

4;' Magnetic'separation cf' the ore.

Treatment 4 failed to give a satisfactory separation of magnetite and

sulfides ,t , 2Q0:mh.. H~nce, npe.to further tests were made along

these lines.

~~~~* !,X' , , . . on -5 0', ~',,,...

T eatmont

The sample was--ruphed to minus,20-mesh in a 4aw-orusher and rolls

and ground to minus 65-mesh in.a pebble mlll4 The ground pulp was conditioned with the reagents and floated in a mechanical-type cell at 25

percent solids. The rougher concentrate was cleaned four times to make

the final copper concentrate.

1783 .. 23-
R.I. 4129

'' Metalurgical 'data '''

_Weight,' Analysis percent Percent of total

Product percent Cu Fe Cu Fe

Concentrate ..... 2.9 21.0 352 90.4 2.0

Middling 1, 2, 5, 4 3.8 1.2 579 638 2.8

Tailing *.. ew ! 93 3 i .02 51.9_____ _95.2

Head (oalculated), 100.0

Operating data

Pounds per ton of feed

Conditioners Cleaners

Reagent 1 _2 Rougher 1 2 3 T

Soda ash ....... 2.0

Sodium cyaxnide.. 0.30 0.20

Potassium_i/ 0.30

Ahyl xantlate

Pine oilJ .12

p ..... - .... 9.0

Time (mdnutes-).'. ~ 5 -5 10 -45 4- -4

1/ American Cyanamid Co.

2/ Hercules Powder Co., Yarmor Itt brand.-

A recovery. of -90.4 percent of the copper, w~a~gobtained in a concentrate

containing 21.0 percent copper and 35.2 percent iron. A higher-grade concentrate may be pr7oduced at a reduced recovery. For' instance, in other tests,

a concentrate containing 23.1 percent Gopper-was made with 82.5 percent recovery, and one containing 26.4 percent copper was made with a recovery of

59.0 percent.

Magnetic Separation of Flotation Tailing

Treatment

A sample of the flotation tailing was ieparated in the Davis-tube, a

low-intensity, wet-magnetic separator, into magnetic and nonmagnetic

products.

Metallurgical data '

I Weight, Analysis s ercent Percdent of total

Product percent Fe iInsol. SiO2 P S Fe I Iisol.

Magnetic .... 80. 1 63.21 7.4 4.510.01 O.0o8 o 98.2 n1. 

Nonmagnetic .... 19.9 4.71,66 .3 1.8 69.o

Feed (calculated), 100.0 51,61 19 6 _ 100.0 100.0

The magnetic product contained 98.2 percent of the iron in the feed or93.4 percent of the iron.in the crude ore.,

1783 -24-
Run-of-Mine Ore

Crusher

Rolls

Screen

10-Mesh Opening - .Oversize

Undersize

Ball Mili

Classifier

65-Mesh Overf1ow- .Sands

Overflow

Conditioners

MagAetic Sep ators

Nonmagnetic Magnetic MiddlingRougher Flotation

Rougher Cojentrate Tailing Waste Thickener

Cleaner FlotatFon iFlter

Concentrate Middling

+ T Sin ering Filter Thickener Machine

Drier Storage Iron Concentrates

Copper Concentrate :

Market

Figure 16. - Suggested flow sheet for milling ore from the "copper-rich"

area of the Mount Andrew mine.
R.I. 4129

Sirntering Magnetic Portion of Flotation Tailing

Treatment

In order to meet size requirements for iron ore, the magnetic product

must be sintered or briquetted. If sintering is used, the coke employed in

the process will add to the silica content of the final product. However,

this will be counteracted to some -extont by an increase in iron content due

to loss of volatile cdnbtitiernt6 in-the sample. In addition, the process

will reduce the sulfur-content of- the sinter.-

A sample of the m~ieti6c product''was'mixed with coke and'water±. in the

following proportions:' Ore'- 80 percent, coke -13 percent, water - 7percent, and sintered in a down-draft laboratory sintering machin>. ;

.Metalllqrgical data

Ma~nctic . Analysis, percent

product FO SiO2 P S

Unsintered 6., .5 0.011 0.08 .

Sintered 63.6| 5.8 .011 ,05

The iron content of the sintered produQt was very little shanged but,

as expected, the silica was Thncas'6& and th6'sulf'ir reduced.

Summary and Conclusions

Laboratory investigation of.'a composite .smple from the "copper-rich"

area of the Mount Andrew mine gave excellent recoverios-of copper and iron

by flotation, magnetic separation and sintering. The grades and recoveries

are shown below:

. -- Su ~ -^ry of resulte:

Analysis, percent Recovery, eorcent

Produot.- Cu 7 Fe SiO2 P 1 Cu F.

Copper Gooncentrato. .2i- -- 1 3..-[...' 90,4.0 Iron concentrate 1 5.8 O;Ol O05 .;

su ~es-zh -vo---Xx - e - r- - ' . 6-'---it

A sugeste tor'milg.the.ore o.floshoet is apponded (fig. 16.. It

is suggested that thc.flotation middling, wbichQontaixfs more than Al-.0 porcent copp'r anad .s. t of t!p00tte7jb E8xnd "e itp&Wnded for fXWtuze

treatment: ... m. :cfrcu1atian..oL..tia prod~ot.in, be circuit would rocsult in

the coitamination of bothsproducts.

Phy " al . Part'2. . - Mount2A~drew Sample 6 

Phyjsical Cba-racter !. . JV. ,

:Thhe ,sample was deporibe.d a rpri.rily a massive ragnetite with some

chalco~prite, pyrite,.opqiote, garnet, quart z and caleite dispersed

throughout.and-in-segreation.. .

t 7 Z i:.36 ,.t :X .!. .
P.I. 4129

Chemical Character

Numerous chemical analyses were requested for Mount Andrew sample 6

also. The analyses of the major constituents are:

Analysis. percent

Cu j Fe jSiO2 I Al203 S P- CaO

0.05 58.3 .7 3 016 0.02 0.

Less than 0.05 percent of each of the following elements also was

present: Manganese, nickel, cobalt, zinc, tungsten, vanadium, and titanium.

Treatment Procedure'

Since the 6re contained too little copper to be economically recovered,

the problem was one of reducing the sulfur content to produce an acceptable iron product. The folloing prpocedures were investigated:

1. Magnetic separ~at1n 'of the ore, crushed to various sizes.

2. Sintering the ,ore.

-- aetic Separation of Ore

Treatment

Separate charges of th'e-ore- were ground to minus 20-, minus 48-, and

mi~nusp.100-mesh.. -The ground.samples were separated in the Davis magnetic tube previously mentioned.

Metallurgical data

IWeight alysl _percent Percent of total

Product percent Fe.Ii. Cu S Fe SiO21 Cu

Minus,20-bmehe 1

MAg9nettic ' 9X''9' 63:lW - 5 00; 99.ol f o-7|3 .2 62:0 80.4

Nonmagnetic 8.1 7 .3. 3411j .l; 1.0j 38. 19.6

Headd (cal.) 100.0. 5 ! q7.14 . °051 - loo, 0100.OlOO.0

Minus' 48-me'sh' - - - -'

Magnetic 89.4 -66.3 3.OI .02} 0031 .°5 98.81 41.6 50.0

Nonmagnetic 10.6 16.7 35.6.17I, 1.2 58.4 50.0

,:ead (calc.) . 100.0 60.o', 6.5: .5 4 , 100.0 100.01100.0

Minus 100-mesh t

Magnetic l::-mesh~ 88.2 . !67.31 1 fT1 1.8 .01| .0031 .02 98.8 27.9 14.8 . ____ Nonmagnetic 11.8 6.23.8 *414 - 1.2 72.1 85.2

Head (calc .) 100.0 60. 1 *7 .06* .|loot.o 100.0 1 .0

A satisfactory separation:of iron and sulfur ws obtained at minus 48-

mesh. The recovery of- iron from. all the sizes wag almost complete. Since

the magnetic product is finely divided, it would:have to be sintered to meet

size requirements. This would give a further reduction in the sulfur content.

1783 -26-
Mine-run-Ore

Cuher

Rolle -

T

Screen

20-Mesh O9eni- Oversize

I- - ----- UUndersize

Ball Mill i

Clasifier

48-Mesh Overflow- . SanIds

I Overflow

lMagne ic Separators

Magnetic Nonmagnetic Middling

I Thic kener Wa te

| Filter

Indicates optional

circuit for high- L - - -Sintering iron ores

Machine

Iron Concentrate

t~~~~~~~~

Morket

Figure 17. - Suggested flow sheet for milling ore from the "magnetite-rich"

area of the Mount Andrew mine.
R.I, 4129

Sintering Ore

Treatment

A sample of the crude ore was crushed to minus 20-mesh, mixed with

coke and water, and sintered. The following charge was used: Ore - 80

percent, coke - 12 percent and water - 8 percent.

Metallurgical data

I Anal sis percent

Head sample Fe SiO2 P S

Unsintered 58.3 6.7 0.02 0.16

Sintered 59.0 9.2 .02 .o6

The product obtained by sintering the head sample is not as high in

iron as that obtained by magnetic separation, but it should be acceptable

as an iron concentrate.

Summary and Conclusions

Laboratory study of this sample from the "magnetite-rich" area of the

Mount Andrew mine, has shown that a high-grade iron concentrate is recoverable by magnetic separation or by sintering. Ore as high in iron as the one

investigated needs only to be crushed and sintered to produce a merchantable

iron ore. On the other hand, when material high in gangue is encountered,

further grinding and magnetic separation must be used in addition to sintering. This is indicated on the following flow sheet (fig. 17).

BIBLIOGRAPHY

WRIGHT, CHARLES WILL. Geology and Ore Deposits of Copper Mountain and

Kasaan Peninsula, Alaska. Geological Survey Prof. Paper 87, 1915,

110 pp.

WRIGHT, FRED EUGENE, and WRIGHT, CHARLES WILL. The Ketchikan and Wrangell

Mining Districts, Alaska. Geol. Survey Bull. 347, 1908, 210 pp.

GODDARD, E. N., WARNER, L. A., and WALTON, MATT. Copper-Bearing Iron

Deposits of the Mount Andrew-Mamie Area, Kasaan Peninsula, Prince

of Wales Island, Southeastern Alaska. Geol. Survey, unpublished

rept.

GODDARD, E. N. Further Suggestions for Exploration of the Mount Andrew

Copper-Bearing Iron Deposits, Mount Andrew-Mamie Area, Kasaan

Peninsula, Southeastern Alaska. Geol. Survey, unpublished rept.

MINING AND METALLURGY. November 1943, Adirondack Mining Issue.

1785 - 27-