‘Table 5s. Undiscovered mineral-resource endowment of selected individual mineral-resource tracts, in metric tons; in all of
Tongass National Forest and adjacent lands, by the U.S. Geological Survey MARKS simulator for tracts entirely or principally within
each of the following! :250,000-scale quadrangles, southeastern Alaska: CR, Craig; MF, Mount Fairweather; PA, Port Alexander:
PE, Petersburg; SD, Sumdum; SI, Sitka: See text of Brew and others (1991) for explanation.

1 2 3 4 5 6 7 8 9
MapNo. Name Mineral. Deposit. Commodity Metal content, Cakulated Calculated grade, Tract tonnage
deposit tonnage intons metal grade units as shown _totals in millions
type no. in percent
CRAIG QUADRANGLE
10CR = Southcentral = Kurokomas- 1.49 +05. cu 2.48E+04 16.6644 12.02
Prince of Wales _ sive sulfide, Au 3.32E+00 0.0022 22.31 gion
Island 28a Zn 5.70E+04 38.2550
Ag 1.816402 0.1216 1.22 kgfton
Pb 1.25E+04 8.3826
Polymetallic  6.23E+05 cu 6.02E+02 0.0965
veins, 22c Au 1.50E+00 0.0002 2.41 gion
2n 3.13E+04 5.0161
Ag 5.57E+02 0.0804 894.06 gfton
Pb 4.63E+04 7.4254
Cu skam, 18 9.91E+06 cu 1.33E+05 1.3370
Au 2.25E+00 2276-05 0.23 gon
Ag 1,87E+01 0.0002 1.89 gfon
16CR Black Lake - PorphyryMo, —1.59E+07 Mo 1.246404 0.0776 15.92
Lake Saint 21b
Nicholas
17CR Pin Peak PorphyryMo, 1.66E+07 Mo 1.206404 0.0773 16.64
2tb
Polymetallic —-7.57E+03 cu 2.596401 0.3419
veins, 22c Au 3.46E-02 0.0005 4.57 gflon
2n 4.40E+02 5.8137
Ag 7.52E+00 0.0993 993.13 gon
Pb 7.45E+02 9.8428
18CR — Maybeso Porphyry Mo, _1.54E+07 Mo 1.16E+04 0.0754 15.78
Creek 21b
Polymetallic 3,73E+05 Cu 3.72E+02 0.0997
veins, 22c Au 9.01E-01 0.0002 2.41 gton
2n 1.93E+04 5.1635
Ag 3.34E402 0.0804 894.37 gfon
Pb 2.70E+04 7.2440


Table 4s. Tongass National Forest and adjacent lands individual mineral-resource tract information for selected tracts entirely or principally within
PE, Petersburg; SD, Sumdum; Sl, Sitka;. See tex! of Brew and others (1991) for explanation of headings. Information for tracts taken from

) 2 3

MapNo. Name Description, including geologic units and
controls of deposits

CRAIG QUADRANGLE

10CR South central ‘Scattered and varied deposits in broad
Prince of Wales expanse of Ordovician, Mississippian, and
Island Devonian sedimentary and volcanic rocks.

16CR Black Lake (A) Lower Paleozoic andesitic breccia and
Lake Saint some Middle Paleozoic carbonate rocks
Nicholas (B) intruded by Cretaceous graniti. pluton
with possible Mo mineralization.

17CR Pin Peak Lower Paleozoic andesitic breccia and
some Middle Paleozoic carbonate rocks
intruded by Cretaceous granitic pluton
with possible Mo mineralization; polymetal-
lic(?) veins also.

18CR Maybeso Creek Ordovician shale and graywacke contain
numerous polymetallic(?) vein .

MOUNT FAIRWEATHER QUADRANGLE

11M Dundas Paleozoic carbonate, clastic and minor vol
River canic rocks intruded by voluminous Tertiary
and Cretaceous granitic rocks; skarn depos-
its near intrusions.

PETERSBURG QUADRANGLE

O6PE TuneheanCreek- Middle Tertiary alkalic and subalkalic
Castle River (A), granitic rocks intrude Cretaceous and Mes-
‘Southeast Zarem- ozic turbidites, other metasedimentary and
bo (B), Central —metavolcanic rocks, Cretace. s granitic
Etolin (C), Nib- rocks, and Tertiary sedimentary and vol-
lack and Deer canic rocks; closely associated with Tertiary
Islands (D) volcanic rocks of tract OSPE 1- the NW, but

more deeply eroded to the Sé.

4 5 6
Mines, prospects, Production and Mineral deposit
and occurrences other resource types expected

(numbers are from _ information (gee table 1 and
table 2; locations Cox and Singer,
are given on plate 3) 1986)
CR004-006, 012, None 8) Kuroko massive
030, 031, 049, sulfide,
063, 095-099, 127; 28a
DEOos b) Polymetallic
vein, 22¢
c) Porphyry Cu,
7
4) Cu skam, 18b
(AYCRO18-020; None Porphyry Mo,
(B)CROZ5 21b
CRO16,017,021- None a) Porphyry Mo,
024 21b
b) Polymetallic
veins, 22c
CRO26-029, 032- Production: a) Porphyry Mo,
048 ‘Several thousand 21b
oz Au 1900 to b) Polymetallic
1940s. veins, 22c

MF050b, 052-055, Reserves: USBM/ a) Cu skarn, 186

057-061 USGS estimate
for MFO54: indi- b) Polymetatlic
caled resource: vein, 2c

27,000 T with __¢) Porphyry Cu-
1.0% Cu, 0.1 o2/T Mo, 21a
Au, 2.0 o2/T Ag.

None None 8)Felsic pluton-

ic U and REE,
FP/UREE(?)

b)Felsic pluton-
ic Th and REE
veins, FPTHRE
m

14

7
Status of geolo-
gic, geochemical,
and geophysical
information

Reconnaissance
geologic and geo-
chemical mapping
by USGS; some
prospecting.

Reconnaissance
and some semi-
detailed geo-
logic and geo-
chemical map-
ping by USGS;
drilling on one

in
1970s.

Reconnaissance
and some semi-
detailed geo-
fogic and geo-
chemical map-
ping by USGS,

Reconnaissance
and some semi-
detailed geo-
logic and geo-
chemical map-
ping by USGS;
intermittent re-
‘examination by
industry.

Reconnaissance
geologic and
geochemical
mapping by USGS:
litle recent
prospecting.

Reconnaissance
and some
semidetailed geo-
fogic and geo-
chemical mapping
by USGS; moder-
ate level of
prospecting loc-
ally.


Table 7s. Metal tonnages and gross-in-place values (GIPV) calculated for selected individual mineral-

resource tracts, in all of Tongass National Forest and adjacent lands, southeastern Alaska.

(All tonnages are metric; see text for complete explanation of headings.)

1 2 3 4 5 5a
Map No. Name Tract tonnage, Commodity Metal content, Commodity
in millions in tons Prices
CRAIG QUADRANGLE
10CR South central 12.02 cu 1,58E+05 2026.88
Prince of Wales Au 7.08E +00 14.68
Island Zn 8.82E+04 1035.47
Ag 7.57E402 0.37
Pb 5.88E+00 837.19
16CR Black LakeLake 15.92 Mo 1.246404 12601.89
Saint Nicholas
17CR Pin Peak 16.64 Mo 1.29E+04 12601.89
Cu 2.50E401 2026.88
Au 3.46E-02 14.68
2n 4.40E+02 1035.47
Ag 7.52E+00 0.37
Pb 7.45E+02 837.19
18CR — Maybeso Creek 15.78 Mo 1.16E+04 12601.89
cu 3.72E402 2026.88
Au 9.01E-01 14.68
Zn 1.93E+04 1035.47
Ag 3.34E+02 0.37
Pb 2.70E+04 837.19
MOUNT FAIRWEATHER QUADRANGLE
11MF Dundas River 80.71 Mo 9.79E+03 12601.89
Cu 4.45E405 2026.88
Au 2.05E+00 14.68
2n 4.07E+02 1035.47
Ag 1.35E+02 0.37
Pb 7S7E+02 837.19
PORT ALEXANDER QUADRANGLE
O8PA Southwest Kuiu 75.82 Mo 1.08E+04 12601.89
Cu 3.88E+05 2026.88
Au 1.52E+00 14.68
2n 2.02E+03 1035.47
Ag 1.70E+02 0.37
Pb 3.84E+03 837.19
PETERSBURG QUADRANGLE
O6PE  TuneheanCreek 1.05 Th 5,33E+03 9.75
Castle River, RE 4.54E+03 12447.68
southeast Zarem- U 8.59E401 3682.09
bo, central Etolin,
Niblack and
Deer Island
15PE Outer Etolin 0.01 cu 9.61E+00 2026.88
Au 1.96E-02 14.68
2n 4.23E+02 1035.47
Ag 6.44E+00 0.37
Pb 4.77E+02 837.19

6
GIPV
commodity

3.20E+08
1,04E+08
9.14E+07
2.80E+08
4.92E+03

1.56E+08

1.62E+08
5.25E+04
5.08E+05
4.56E+05
2.78E+06
6.24E+05

1.46E+08
7.54E+05
1.32E+07
1.99E+07
1.23E+08
2.26E+07

1.23E+08
9.01E+08
3.01E+07
4.21E+05
5.01E+07
6.33E+05

1.37E+08
7.86E+08
2.23E+07
2.09E+06
6.30E+07
B.21E+06

5.20E+07
5.66E+07
3.15E+06

1.95E+04
2.88E+05
4,38E+05
2.38E+06
4.00E+05

7
GIPV of
tract

7.95E+08
1.56E+08

1.66E+08

3.26E+08

1.11E+09

1.01E+09

1.12E+08

3.53E+06


The comprehensive report by Brew and others (1991) estimated the undiscovered locatable metallic mineral-
resource endowment of all of the region; it then estimated the undiscovered mineral-resource endowment of the
Tongass National Forest , which covers about 80 percent of the region; and, finally, it estimated the undiscovered
mineral-resource endowment of that part of the Tongass that was open to mineral entry as of October, 1990.

This supplementary report revises the previous calculations of amount and gross-in-place-value (GIPV) of
undiscovered resources in lands open to mineral entry to reflect the six new Wilderness areas created by the
Tongass Timber Reform Act of October 1990. Those areas are the Pleasant-Lemesurier-Inian Islands, Young Lake,
Chuck River, Kuiu Island, South Etolin Island, and Karta River Wildemesses. This report also corrects two calculation
errors in the previous report, one concerned with the amount and gross-in-place-value (GIPV).of the undiscovered
molybdenum endowment of the Tongass National Forest, and the other with the gross-in-place-value (GIPV).of the
undiscovered thorium endowment of tho:.e parts of the Forest that are now open to mineral entry.

With the revised figures, the Tongass National Forest is now estimated to contain about 69 percent of the
endowment of the whole region and , in turn, the parts of the Forest now open to mineral entry are now estimated to
contain about 83 percent of the undiscovered metallic mineral resource endowment of the Tongass National Forest.

The report by Brew and others (1991) contains detailed descriptions of the process involved in the undiscovered-
mineral-resource appraisal of the region and of the material contained in the tables. That information is not repeated
here.

In order to recalculate the undiscovered-mineral-resource endowment of the parts of the Forest now open to mineral
entry, it was necessary to reexamine those previously defined mineral-resource-assessment tracts in the areas of the
new Wildemesses and to reestimate the vercentages of the tracts open to mineral entry. The results of those
reexaminations and reestimations are communicated here in the form of revised pertinent parts of tables 3 and 4 of
Brew and others (1991). The pertinent parts of table 5 of Brew and others (1991) are included for completeness, as
is table 6. The effects of the reestimates on the derivative tables are communicated here in the form of revised
pertinent parts of tables 7, 8, 9, and 10. A complete version of table 11, including the revised pertinent parts is
included. Thus, the reader needs to have the report by Brew and others (1991) to get the full explanation of the table
headings and the like, but the material in this report fully documents the revisions made as a result of the creation of
the six new Wilderness areas.

REFERENCES CITED
Brew, D.A., Drew, L.J., Schmidt, L.M., Root, D.H., and Huber, D.F, 1991, Undiscovered locatable mineral resources
of the Tongass National Forest and adjacent areas, southeastern Alaska: U.S. Geological Survey Open-File

Report 91-10, 370 p., 15 maps at 1:250,000, 1 map at 1:500,000, 11 figs.

All other references are to be found in the references section of the above document.

s


Table 11s. Gross-in-place values (GIPV) calculated for those parts of individual

mineral-resource tracts that are totally or partially in parts of the
Tongass National Forest that are now open to mineral entry. (All

tonnages are metric. See text for complete explanation.)-continued

1 2 3 4
Map no. Name Tract GIPV Fraction of tract in
Tongass NF and

open to mineral entry

SKAGWAY QUADRANGLE-CONTINUED.
178K Meade Glacier 3.96E+07

TAKU RIVER QUADRANGLE

02TR Bacon Glacier 1.85E+08
& Mount Ogden

03TR Kluchman 4,98E+06
Mountain

04TR Snow Tower- 4.43E+07

Sawyer Glacier

YAKUTAT QUADRANGLE

O1YA Fairweather 9.98E+08
Range

02YA Yakutat Range 1.60E+08

Total GIPV for Mineral Resources in Tongass National
Forest lands now open to mineral entry

kt

100

100

100

0.41

0.37

0.31

5
Tract GIPV in
that fraction

3.96E+07

1.85E+08
4.98E+06

1.82E+07

3.69E+08
4.96E+07

2.35E+10


‘Table 5s. Undiscovered mineral-resource endowment of selected individual mineral-resource tracts, in metric tons; in all of
‘Tongass National Forest and adjacent lands, by the U.S. Geological Survey MARKS simulator for tracis entirely or principally within
each of the following! :250,000-scale quadrangles, southeastern Alaska: CR, Craig; MF, Mount Fairweather; PA, Port Alexander;
PE, Petersburg; SD, Sumdum; SI, Sitka;. See text of Brew and others (1991) for explanation. - Cowkinvedt

1 2 3 4 5 6 7 8 9
Map No. Name Mineral. Deposit. © Commodity Metal content, Cakulated Calculated grade, Tract tonnage
deposit tonnage in tons metal grade units as shown —_ totals in millions
type no. in percent

MOUNT FAIRWEATHER QUADRANGLE

11MF Dundas River Cuskam, 18 4469500 Cu 59575 1.33277405 80.709
Au 0.83845 1.8757E-05 0.18757 gion
Ag 8.8277 0.00019749 1.97488 gfton
Polymetallic 8919.1 Cu 3.5213 0.03947646
veins, 22¢ Au 0.0087398 9.798E-05 0.9798 ghon
2n 406.51 4.557287
Ag 11.284 0.12650224 1.26502 kgfon
Pb 756.62 8.482287
PorphyryCu- 76242000 Cu 385160 0.50545932
Mo, 21a Mo 9786.2 0.01284278
Au 1.2025 1.5781E-06 0.01578 gion
Ag 115.38 0.00015142 1.51417 gfton
PORT ALEXANDER QUADRANGLE.
O8PA — Southwest Kuiu PorphyryCu- 75776000 Cu 387760 0.51155673 75.815
Mo, 21a Mo 10838 0.01429815,
Au 1.4295 1,8859E-06 0.01886 gion
Ag 123.14 0.00016245 1.62454 gion
Polymetallic 41606 Cu 49.193 0.118254
veins, 22c Au 0.090645 0.0002179 2.17897 gfton
2n 2018.4 4.85192308
Ag 47.06 0.413125 1.13125 kgfton
Pb 3839.7 9.23004808
PETERSBURG QUADRANGLE
O6PE — TuneheanCreek- Felsic Plutonic 1047800 Th 5334.5 0.50804762 1.0478
Castle River, Th-REE, REE 45444 0.43277143
southeast Zarem- u 85.923 0.00818314 81.8314 gion
bo, central Etolin,
Nolack and
Deer Island
15PE Outer Etolin Polymetallic 6854.7 Cu 9.6103 0.14029635, 0.00685
veins, 22c Au 0.0196 000028613 2.86131 giton
Zn 423 6.17518248
Ag 6.4361 009395766 939.577 gton
Pb 477.33 696832117


Table 9s. Metal tonnages and gross-in-place values (GIPV) calculated for those parts of selected individual
mineral-resource tracts that are totally or partially in the Tongass National Forest , south-
eastern Alaska. (All tonnages are metnc; see text tor complete explanation ot headings.)

1 2 3 4 5 5a 6 7
Map No. Name Tracttonnage, Commodity Metal content, Commodity GIPV GIPV of
in millions* in tons prices commodity tract
10CR South central 12.02 cu 4.74E+04 2026.88 9.60E+07
Prince of Wales 3.61 Au 2.12E+00 14.68 3.12E+07
Island Zn 2.65E+04 1035.47 2.74E+07
Ag 2.27E+02 0.37 8.40E+07
Pb 1.76E+00 837.19 1.48E+03
2.39E+08
16CR —_BlackLake-Lake 15.92 Mo 4.33E+03 12601.89 5.45E+07
Saint Nicholas 5.57 5.45E+07
17CR Pin Peak 16.64 Mo 3.23E+03, 12601.89 4.06E+07
4.16 cu 6.47E+00 2026.88 1.316404
Au 8.65E-03 14.68 1.27E+05
Zn 1,10E+02 1035.47 1.14E+05
Ag 1.88E+00 0.37 6.95E+05
Pb 1.86E+02 837.19 1.56E+05
4.17E+07
18CR —— Maybeso Creek 15.78 Mo 4.07E+03 1260189  §.13E+07
5.52 cu 1.30E+02 2026.88 2.64E+05
Au 3.15E-01 14.68 4.63E+06
2n 6.74E+03 1035.47 6.98E+06
Ag 1.17E+02 0.37 4.32E+07
Pb 9.46E+03 837.19 7.92E+06
1.14E+08
PORT ALEXANDER QUADRANGLE
0sPA Southwest Kuiu 75.82 Mo 1.08E+04 12601.89 1.37E+08
cu 3.88E+05 2026.88 7.86E+08
Au 1.52E+00 14.68 2.23E+07
2n 2.02E+03 1035.47 2.09E+06
Ag 1.70E+02 0.37 6.30E+07
3.84E+03 837.19 3.21E+06
1.01E+09
PETERSBURG QUADRANGLE
O6PE  TuneheanCreek = 1.05 Th 4.05E+03 9.75 3.95E+07
Castle River, 0.80 RE 3.45E+03 1244768  4.30E+07
southeast Zarem- uU 6.53E+01 36682.09  2.40E+06
bo, central Etolin, 8.49E+07
Niblack and
Deer Island
07PE —_—_Kosciusko- 84.49 Mo 4,70E+03 1260189 5.92E+07
Northem Prince 38.02 cu 2.04E+05 2026.88 4.14E+08
of Wales Au 9.59E-01 14.68 1.41E+07
2n 2.70E+03 1035.47 2.80E+06
Ag 9.93E+01 0.37 3.67E+07
Pb 3.65E+03 837.19 3.05E+08
5.30E+08
15PE Outer Etolin 0.01 cu 5.67E+00 2026.88 1.15E+04
0.006 Au 1.16E-02 14.68 1.70E+05
Zn 2.50E+02 1035.47 2.58E+05
Ag 3.80E+00 0.37 1.41E+06
Pb 2.82E+02 837.19 2.36E+05
2.08E+06

27


Table 6. Commodity prices used in calculation of gross-in-place value of
undiscovered mineral resources, Tongass National Forest and
adjacent lands. (Prices are averages for the decade 1978-1987,
based on U.S. Bureau of Mines (1983, 1988). Prices have been
rounded to two places. The following conversions were used: @.9078
mt = 1 st, 1 kg = 2.2 lb, 1 st = 2,000 1b, 1 stu = 20 lb, 31.1 g =
1 troy ozi from Coldwell (1990). Prices for antimony and tin
calculated specifically for this report by a method similar to that

of the USBM).
Gommodity = Symbol Price (English) i Price (Metric) i
Antimony Sb $1.66/1b $3,652. 00/mt
Barite Barite $ 39.00/st . , $ 42.96/mt«
Cobalt Co 6.70/Ib 14,760.96/mt
Columbium Oxide = Cb,0, 2.94/lb 6,477.20/mt
Copper Cu 0.92/Ib 2026.88/mt
Gold Au 456.43/tr oz 14.68/g
Tron Fe 65.85/st 72.54 /mt
Lead Pb 0.38/1b 837.19/mt
Molybdenum Mo 5.72/Ib 12,601.89/mt
Nickel Ni 2.85/Ib '6,278.92/mt
Palladium Pda 135.75/tr oz .  , 4.86/g
Platinum Pt 603.38/tr oz - 16.19/g
Rare Earth Metals RE 5.65/Ib 12,447.68/mt
Silver Ag 11.58/tr oz 0.37/g
Thorium Oxide Tho, 4.43/b 9.75/kg
Tin Sn 8.62/1b 18,964.00/mt
Titanium Ti 6.82/Ib 15,025.34/mt
Tungsten Oxide wo, 31.35/stu 3,453.40/mt
Uranium Oxide U,0, 16.65/1b 36,682.09/mt
Vanadium Oxide v.05 4.10/Ib 9,032.83/mt
Yttrium Oxide Y,0,; 6.24/Ib 13,747.52/mt
Zinc ‘Zn 0.47/Ib 1,035.47/mt
Zirconium Oxide ZrO, 172.00/st 189.47/mt

23


F-344

138 136 134 132 130
T , 7 S T
460
459
458
4 57
* aN
baw Mn
4 * + 3 56
CLASSIFICATION OF LANDS IN SOUTHEASTERN CB,\ > £4
‘ALAS! % \
tates generalized to some extent 5 al
boundaries) ve,
@ - vis. Forest service Tongass 'y “ 5
wational Forest u h
Fes and Woeast ati acendte” CEO 2
SoD eet te Peart atcionel 55
NO Melonth walaiate “Refege . 4
D> SEL a Boat allen hanes , my
sak i) 100 Miles ~~ OH { Jsa
o 150 Kilometers % y iS
1 1 f \ A
138 136 134 132 130

Figure 1s:


Table 4s. Tongass National Forest and adjacent lands individual mineral-resource tract information for selected tracts entirely or principally within
PE, Petersburg; SD, Sumdum; SI, Sitka;. See tex of Brew and others (1901) for explanation of headings. Information for tracts taken from

1 2 3 4 5 6 7
Map No. Name Description, including geologic units and Mines, prospects, Production and Mineral deposit —Stalus of geolo-
controls of deposits and occurrences other resource types expected gic, geochemical,
(numbers are from —_ information (see table t and and geophysical
table 2; locations Cox and Singer, information
are given on plate 3) 1986)
SITKA QUADRANGLE
1381 Admiralty Island Highly deformed and slightly metamorph-  $1088-091, 093, Pyrola prospect —_a)Sierran massive Reconnaissance
sed Late Triassic mafic and intermediate 094, 097, 100-103, (S1090) is best ‘sulfide, 28¢ and some detail-
volcanic rocks, fine-grained clastic rocks, 105-112. known in Si quad; —b)Synorogenic- ed geologic and
‘and ultramafic masses host, in different through 112; Production: sig- ‘synvolcanic Ni geochemical map-
places, significant massive sulfide, Ni-Cu  JU028-045. nificant in from Cu, 7a ping by USGS; in-
magmatic segregation, and polymetallic polymetallic vein tense private
vein deposits. deposits JU032, prospecting loc-
034, 037; and ally in the past.
from synorogenic-
syn-volcanic Ni-
Cu deposit JU033.
Reserves: JU033
contains reserves
‘of about 560,000
T with 0.35% Cu,
0.34% Ni, 0.15% Co.
Deposit JU044 has
just started production.
Reserves: JU044

contains reserves of 3.5
million T with 3.9% Pb,
9.7% Zn, 23.8 oz/T
‘Ag,0.18 o2/T Au.

(©


Table 3s. Tongass National Forest and adjacent lands individual mineral-resource tract information for selected tracts in the following 1:250,000-scale
PE, Petersburg; SD, Sumdum; SI, Sitka. See text of Brew and others (1991) for explanation of headings and sources of information. — Coulkavod) ,

1 2 5 6 7
Map No. Name Deseription, including geologic units and Mines, prospects, Production and Mineral deposit Status of geolo-
of deposits and occurrences other resource types expected gic, geochemical,
(numbers are frorr information (300 table 1 and —_and geophysical
table 2-BC) Cox and Singer, information
1986)
MOUNT FAIRWEATHER QUADRANGLE
11MF Dundas River Paleozoic carbonate, clastic and minor vol MF050b, 052-055. Reserves: USBM a) Cu skam, 185 Reconnaissance
canic rocks intruded by voluminous Tertian 057-061 USGS estimate geologic and
and Cretaceous granitic rocks; skam depos- for MFO54: indi- b) Pohmetalc some geochemical
its in carbonates near intrusions. cated resource: vein, 22c mapping by USGS;
27,000 T with —_¢) Porphyry Cu- _ itl recent
4.0% Cu, 0.1.02/ Mo, 21a prospecting
Au, 2.0 o2/T Ag.
PORT ALEXANDER QUADRANGLE
08PA Southwest Kuiu Cretaceous granodiorite plutons and dikes None None a) Porphyry Cu- Reconnaissance
intrude middle Paleozoic graywacke, car- Mo, 21a and some
bonate, and minor conglomerate; some b) Polymetallic —_semidetailed geo-
large altered zones. veins, 22c logic and geo-
chemical mappin:
by USGS; litle
exploration.
PETERSBURG QUADRANGLE
O4PE ‘Southwest Kuiu Cretaceous granodiorite plutons and dikes PEOO1 None a) Porphyry Cu- Reconnaissance
intrude middle Paleozoic graywacke, car- and some
bonate, and minor conglomerate; some large ») Pol imei semidetailed geo-
altered zones. logic and geo-
chemical mappi
by USGS; little
exploration.
O6PE Tunehean Creek- Middle Tertiary alkalic and subalkalic None None a)Felsic phiton- Reconnaissance
Castle River (A), granitic rocks intrude Cretaceous and Mes- ic U and REE, and some
Southeast Zarem- _ozic turbidites, other n etasedimentary and FP/UREE(?) ‘semidetailed geo-
bo (B), Central metavolcanic rocks, Cretaceous granitic b)Felsic pluton- _—_fogic and geo-
Etolin (C), Nib- rocks, and Tertiary sedimentary and vol- ic Th and REE chemical mapping
lack and Deer canic rocks; closely associated with Tertiary veins, FP/THRE by USGS; moder-
Islands (D) volcanic rocks of tract OSPE to the NW, but (7) ate level of
more deeply eroded to the SE. Prospecting loc-
ly.
15PE Outer Etolin Mesozoic turbidites, other metasedimentary None None a)Polymetallic Reconnaissance
feland and metavolcanic rocks, and Cretaceous grani- vein, 22¢ geologic and geo-
tic rocks are intruded by Middle Tertiary b)W vein, 15a(?) chemical it
alkalic and subalkalic granitic rocks, pro- by USGS; low
ducing permissive vein and skam environ- level of pros-
ments; intrusive rocks elsewhere (in tract pecting.
O5PE) have close relation to volcanic rocks.
16PE Canoe Passage Fault cuts Cretaceous turbidites intruded © None None Polymetallic Reconnaissance
by Late Cretaceous tonalite and Middle vein, 22¢ geologic and geo-
Tertiary granite. chemical mappi
by USGS; low
level of pros-
pecting.
18PE Tracy Arm-Stikine Deformed and metamorphosed Paleozoic : PEO34 None a)Metamorphosed Reconnaissance
River Mesozoic clastic and volcanic rocks are massive sulfide, geologic and geo-
intruded by Late Cretaceous granodiorite RM/MS (model as chemical mapping
and tonalite near the 3 end of the tract and ‘Sierran massive by USGS; low
intruded by latest Cretaceous-earliest sullide, 28c) level of pros-
Tertiary great ton.x:te sill for the whole b)Polymetallic pecting in N 2/3
length of the tract; massive sulfide vein, 22¢ ‘of tract, moder-
deposits in metamorphic rocks close to c)Au-Quz vein, ate inthe S 1/3.
the sill have been metamorphosed; they 368

are inferred to have been Sierran-type
massive sutfide deposits; vein deposits
that are inferred to be young aleo present.

10


Table 11s. Gross-in-place values (GIPV) calculated for those parts of individual
mineral-resource tracts that are totally or partially in parts of the
Tongass National Forest that are now open to mineral entry. (All
tonnages are metric. See text for complete explanation.)-continued

1 2 3 4 5
Map no. Name Tract GIPV Fraction of tract in Tract GIPV in
Tongass NF and that fraction

open to mineral entry

PORT ALEXANDER QUADRANGLE

O5PA Security Bay 1.94E+07 100 1.94E+07

O6PA Saginaw Bay- 7.93E+08 0.85 6.74E+08
Cornwallis Penin-
sula

O8PA Southwest Kuiu 1.01E+09 0.5 5.05E+08

PETERSBURG QUADRANGLE

O5PE Southwest 3.55E+08 1 3.55E+08
Kupreanof

O6PE Tunehean Creek- 1.12E+08 0.92 1.03E+08
Castle River,

southeast Zarem-
bo, central Etolin,

Niblack and
Deer Island
07PE Kosciusko- 1.18E+09 1 1.18E+09
Northern Prince
of Wales
O8PE Salmon Bay 1.12E+08 1 1.12E+08
12PE Duncan Canal- 2.17E+08 0.95 2.06E+08
Zarembo Island
13PE Kupreanof 2.65E+07 0.9 2.39E+07
Mountain
14PE Woewodski 1.23E+08 1 1.23E+08
15PE Outer Etolin 3.53E+06 0.8 2.82E+06
20PE Groundhog Basin 3.43E+09 1 3.43E+09
SUMDUM QUADRANGLE
02SD Snettisham 8.00E+06 1 8.00E+06
04SD Tracy Arm- 1.43E+08 0.41 5.86E+07
Stikine River

%3


Table 11s. Gross-in-place values (GIPV) calculated for those parts of individual
mineral-resource tracts that are totally or partially in parts of the Tongass
National Forest that are now open to mineral entry. (All tonnages are
metric. See text for complete explanation.)

1 2 3 4 5
Map no. Name Tract GIPV Fraction of tract in Tract GIPV in
Tongass NF and that fraction
open to mineral entry
ATLIN QUADRANGLE
O1AL Lace River 6.09E+07 100 6.09E+07
O3AL Chilkoot Range 2.30E+07 100 2.30E+07
metabasalts

BRADFIELD CANAL QUADRANGLE

01BC. Bradfield Canal 1.46E+09 0.82 1.20E+09
Coast Mountains

02BC Cone Mountain 1.88E+08 100 1.88E+08

04BC Glacier Basin- 5.94E+07 0.87 5.17E+07
Berg Basin

05BC Harding River 5.29E+07 100 5.29E+07

10BC Burroughs Bay 9.33E+08 0.19 1.77E+08

12BC Chickamin 8.90E+08 0.38 3.38E+08
Glacier

13BC Texas Creek- 1.09E+09 100 1.09E+09
Hyder

CRAIG QUADRANGLE

03CR Sweetwater 9.53E+06 0.91 8.67E+06
Lake

07CR Lava Creek 8.21E+07 100 8.21E+07

09CR Lower Cleveland 4.27E+08 100 4.27E+08
Peninsula

10CR South central 7.95E+08 0.58 4.61E+08
Prince of Wales
Island

30


quadrangles, southeastern Alaska: BC, Bradfield Canal; CR, Craig; DE, Dixon Entrance; JU, Juneau; KC, Ketchikan; MF, Mount Fairweather; PA, Port Alexander;

8 9 10 "1 12 13
Accessibility and related factors, ‘Summary of undiscovered resource Estimated number of undis- Grade ‘Tract Remarks
including percent of tract in dit- information ‘covered deposits (% chance andton- area, in
ferent land status(es) that there are the number nage mod- square
given or more deponis) el avail- kilo-
95 80 50 10 able? meters
In part close to tidewater; some Permissive geology; Cr, Ni, Mo, W, a0 0001 Yes Same undiscovered
pas sloop and rugged: ‘some thick Pb, Nb stream-sediment anomalies; resources as in adjoin-
th and timber. Cu, Pb, Au, Mo, Zn, Cr, Nibedrock = =b)0 0 0 0 1 Yes ing tracts 15PE, OSCR,
100% in USFS Tongass Nationa! anomalies in tract 15PE to W. and O1KC.
Forest. (00001 Yes
In part close to tidewater; some Permissive geology; Cr, Ni, Mo, W, a0 0001 Yes 70 Same undiscovered
parts steep and rugged: some thick Pb, Nb stream-sediment anomalies; resources as in adjoining
brush and timber; some logging Cu, Pb, Au, Mo, Zn, Cr, Nibedrock = =9b)0 0 0 0 1 Yes tracts OOBC and 15PE.
roads. ‘anomalies in tract 15PE to N.
85% in USFS South Etolin
Wiklemess;
15% in USFS Tongass National
Forest.
Close to tidewater; local thick Permissive geology; Cu, Mo, Ni No estimate. Yes 4 Same undiscovered
brush and timber. bedrock anomalies in tract 16PE to resources as in adjoining
100% in USFS South Etolin N; very small tract. tract 16PE.
Wildemess.
In part close to tidewater; heavy Known deposits; permissive geology; a)0 1 2 3 5 Yes 1606 Same resources as in tracts
timber, limited outcrop; part has numerous Cu anomalies: O3DE and 11KC.
logging roads. scattered Pb, Zn, Ba, Ag anomalies; b)O 3 6 8 10 Yes
very large tract.
900123 Yes
02% in USFS Karta
River Wikiemess Area; do 12 4 6 Yes
40% in Alaska Native lands;
58% in USFS Tongass National
Forest.
Close to tidewater in part; local- Known occurrences; permissive geo 0 0 0 0 1 Yes 233
ly steep; close to State roads; ear Mo geachem anomalies; moder-
also logging roads. at
50% in Alaska Native lands;
20% in USFS Karta River
Wikiemess Area;
‘90% in USFS Tongass National
Forest.
Close to tidewater in part; local- Known occurrences; permissive geo a)0 0 0 1 2 Yes 60
ly steep; close to Stale roads; ‘ogy; Mo geochem anomalies; small
also logging roads. tract. b0 0 001 Yes
25% in Alaska Native lands;
25% in USFS Karta River
Wildemess Area;
50% in USFS Tongass National
Forest.


Table 3s. Tongass National Forest and adjacent lands individual minerel-resource tract information for selected tracts in the following 1:250,000-scale
PE, Petersburg; SD, Sumdum; SI, Sitka. See text of Brew and others (1991) for explanation of headings and sources of information.

1 2 5
Map No. Name Description, including geologic units and Mines, preepects, Production and
of deposits and occurrences other resource
(numbers are from information
table 2-BC)
BRADFIELD CANAL QUADRANGLE
O9BC Outer Etolin Mesozoic turbidites, other metasedimentary None None

CRAIG QUADRANGLE
05CR Outer Etolin

06CR Canoe Passage

10CR South-central
Prince of Wales
island

16CR Black Lake (A),
Lake Saint
Nicholas (B)

17CR Pin Peak

and metavolcanic rocks, and Cretaceous
granitic rocks are intruded by Middle Tertiary
akalic and subalkalic granitic rocks, pro-
ducing permissive vein and skam environ-
ments; intrusive rocks elsewhere (in tract
O5PE) have close relation to volcanic rocks.

Mesozoic turbidites, other metasedimentary None None
and metavolcanic rocks, and Cretaceous grani-

tic rocks are intruded by Middle Tertiary

akalic and subalkalic granitic rocks, pro-

ducing permissive vein and skam environ-

ments; intrusive rocks elsewhere (in tract

O5PE) have close relation to volcanic rocks.

Fault cuts Cretaceous turbidites intruded None None
by Late Cretaceous tonalite and Middle
Tertiary granite.

Scattered and varied deposits in broad + CR004-006, 012, None
expanse of Ordovician, Mississippian, and 030,031, 049,
Devonian sedimentary and volcanic rocks. 063, 095-099, 127

Lower Paleozoic andesitic breccia and (A)CRO18-020; None
some Middle Paleozoxc carbonate rocks (B)CRO25

intruded by Cretaccous granitic pluton

with possible Mo mineralization.

Lower Paleozoic endesitic breccia and CRO16,017,021- None
‘some Middle Paleozoi: carbonaie rocks: 24

intruded by Cretaceous granitic pluton

with possible Mo minerakzation; polymetal-

Ko?) veins also.

6
Mi ,
types expected
(s00 table 1 and
Cox and Singer,
1986)

s)Polmetalic
byw vein 1502)

)Polymetallic
vein, 22c
byW vein, 15a(7)

Polymetatlic
vein, 2c

a) Kuroko massive
‘sulfide,

28a
b) Polymetatiic
vein, 2c

€) Porphyry Cu,
6) Gu skern, 18

Porphyry Mo,
21b

” rophyry Mo,

b) yPelymetaic
veins, 22c

7
Status of geolo-
gic, geochemical,
and geophysical
information

Reconnaissance
geologic and geo-
chemical mapping
by USGS; low
level of pros-
pecting.

Reconnaissance
geologic and geo-
chemical mapping
by USGS; low
level of pros-
Pecting

Reconnaissance
geologic and geo-
chemical mapping
by USGS; low
level of pros-
pecting.
Reconnaissance
geologic and geo-
chemical mapping
by USGS; some
prospecting.

Reconnaissance
and some semi-
detailed geo-
logic and geo-
chemical map-
ping by USGS;
drilling on one
Prospect in 1970's

Reconnaissance
and some semi-
detailed geo-
Jogic and geo-
chemical map-
ping by USGS.


the following 1:250,000-scale quadrangles, southeastern A!ska: CR, Craig: MF, Mount Fairweather, PA, Port Alexander;
sources given in table 3s. — Cowtinved .

8 9 10 1 12 13
Accessibilty and related factors, Summary of undiscovered resource Estimated number of undis- Grade Tract © Remarks and relerences
including percent of tract indi- information covered deposits (% chance andton- area,in to tracts in table 3.
ferer! land status(es) that there are the number nage mod- square

given or more deposits) elavait —kilo-

95 90 50 10 05 able? meters
In part close to tidewater; local ‘Significant known deposits; permis-. a)0 0 0 1 3 Yes SI 1,546 Includes tracts 13SI,
ly heavy timber; steep in part; sive geology; abund: x and varied JU “409 OBJU, and O1SD.
79% in USFS Admiralty Island Na- geochemical anomelwes; relatively b)0 0 0 0 1 Yes SD 12

tional Monument and Wilder- well prospected locally. Tot 1967

ness;
04)% in Alaska Native lands;
16% in USFS Tongass National

Forest;
01% in USFS Young Lake
Wilderness.

9


quadrangles, southeastern Alaska: BC, Bradfield Canal; CR, Craig; DE, Dixon Entrance; JU, Juneau; KC, Ketchikan; MF, Mount Fairweather; PA, Port Alexander;

10 abl 12 13
Estimated number of undis- Grade ‘Tract Remarks
covered deposits (% chance andton- area, in

8
Accessibility and related factors,

9
‘Summary of undiscovered resource
including percent of tract in di-' information

ferent land status(es) that there are the number nage mod- square
given or more deposits) elaval- —_kilo-
95 90 50 10 05 able? meters
‘Close to tidewater in part; local- Known deposits; permissive geol- a0 000 1 Yes 90
ly steep; close to State roads; ‘ogy; widespread Zn, Pb, Mo, Cu
also logging roads. guecher anomates: ‘small tract. bo 136 8 Yes
15% in Alaska Native lands;
25% in USFS Karta River
Wildemess Area;
60% in USFS Tongass National
Forest.
In part close to tidewater; heavy Known deposis: permissive geology: ao123 5 Yes 1 Same resources as in
timber, limited outcrop; part has. numerous Cu tracts 10CR and 11KC.
logging roads. scatiered Pb, Ba Ag aronales: bo 3 6 8 10 Yes
100% in USFS Tongass National very large tract in quad to N,
Forest. very small part here. oo 0 1 2 3 Yes
do124 6 Yes
Close to tidewater, locally heavy Known deposits and mines; permis- a)0 0 0 1 3 Yes 409 Same undiscovered
timber; steep in part, sive geology; abundant and varied resources as in adjoining
19% in USFS Admiraky Island Na- geochemical anomalies; relatively bo 0001 Yes tract 13S| and 01SD.
tional Monument; well prospected.
79% in USFS Tongass National
Forest;
02% in USFS Young Lake
Wikdemess.
In part close to tidewater; some Permissive geolog: ; Cr, Ni, Mo, W, aoooo1 Yes 50 Same undiscovered
parts steep and rugged; some Pb, Nb stream-sediment anomalies; resources as in adjoining
thick brush and timber; some. Cu, Pb, Au, Mo, Zn, Cr, Nibedrock =b)0 0 0 0 1 Yes tracts O9BC, OSCR, and
logging roads. anomalies in tract 15PE to NW. 15PE,
100% in USFS Tongass National
Forest.
Close to tidewater; low rekel; Known deposits; permissive geology; a)0 1 2 3 5 Yes 1 Same resources as in tract
timber and brush. numerous Cu geochem anomalies: 10CR.
100% in USFS Tongass National scattered Pb, Zn, Ba,Aganomalies b)O 3 6 8 10 Yes
Forest. in tract 10CR to W: adjoins that
very large tract. 000123 Yes
d012 46 Yes


Table 7s. Metal tonnages and gross-

(All tonnages are metric; see text for complete explanation of headings.)-Continued.

SUMDUM QUADRANGLE

04SD ‘Tracy Arm-
Stikine River

OSSD Endicott Penin-
sula

‘SITKA QUADRANGLE
13S Admiralty Island

0.94

0.33

0.72

Cu

Zn
Ag

Ni
Pt

Pd

1.43E+04
2.50E+00
3.21E+04
1.03E+02
7.18E+03

4.41E+03
1.17E+00
1.22E+04
7.20E+01
5.21E+03

8.12E+03
6.86E-01
1.25E+04
3.99E+01
2.63E+03
3.49E+03
2.26E-04
1.56E+01
6.55E-04

2026.88
14.68
1035.47
0.37
837.19

2026.88
14.68
1035.47
0.37
837.19

2026.88

1035.47
0.37
837.19
6278.92
16.19
14760.96
4.36

2.89E+07
3.66E+07
3.32E+07
3.80E+07
6.01E+06

8.95E+06
1.72E+07
1.26E+07
2.66E+07
4.36E+06

1.65E+07
1.01E+07
1,30E+07
1.48E+07
2.20E+06
2.19E+07
3.65E+03
2.30E+05
2.85E+03

TOTAL GIPV FOR ALL TRACTS, INCLUDING OTHERS IN TABLE 7 OF BREW AND OTHERS (1991):

in-place values (GIPV) calculated for selected individual mineral-
resource tracts,in all of Tongass National Forest and adjacent lands, southeastem Alaska.

1.43E+08

6.98E+07

7.86E+07

4.08E+10


U. S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY

TONGASS TIMBER REFORM ACT WILDERNESS AREAS
SUPPLEMENT TO U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 91-10
(UNDISCOVERED LOCATABLE MINERAL RESOURCES OF THE
TONGASS NATIONAL FOREST AND ADJACENT LANDS,
SOUTHEASTERN ALASKA)

By

David A. Brew

and

\l

James L. Drinkwater

OPEN-FILE REPORT 91-343

This report is preliminary and has not been reviewed
for conformity with U.S. Geological Survey editorial standards
or with the North American Stratigraphic Code.
Any use of trade, firm, or product names is for descriptive
purposes only and does not imply endorsement by the
U.S. Government

\LU.S. Geological Survey, MS 904
Menlo Park, CA 94025

1991


Table 3s. Tongass National Forest and adjacent lands individual mineral-resource tract information for selected tracts in the following 1:250,000-scale
PE, Petersburg; SD, Sumdum; SI, Sitka. See text of Brew and others (1991) for explanation of headings and sources of information. ~ Cowtused ,

1 2

Map No. Name Description, including geologic units and Mines, prospects, Production and Mineral deposi Status of yeolo-
of deposits and occurrences’ other resource types expected gic, geochemical,
(numbers are from information (see table 1 and —_and geophysical
table 2-BC) Cox and Singer, information
1986)
‘SUMDUM QUADRANGLE
01SD Admiralty Highly deformed and slightly metamorphos SD001 None a)Sierran massive Reconnaissance
island Late Triassic mafic and intermediate vol- sulfide, 2Bc and some detail-
canic rocks, fine-grained clastic rocks, b)Synorogenic- ed geologic and
and ultramafic masses host, in different synvoicanic Ni- geochemical map-
places, significant massive sulfide, Ni-Cu Cu, 7a ping by USGS; in-
magmatic segregation, and polymetallic tense private
vein deposits. prospecting loc-
ally in the past.
04SD Tracy Arm- Deformed and metamorphosed Paleozoic SD006,008,009- Production: at  a)Metamorphosed Reconnaissance
‘Stikine River and Mesozoic clastic and volcanic rocks ar 011, 015-017, 021 SD036, 500z Au massive sulfide, seologt mapping
intruded by latest Cretaceous-earliest 025, 036 in early 1900's. RM/MS (model as ical
Tertiary great tonalite sil; known sulfide Reserves: Sierran massive conten by USGS.
deposits are in metamorphic rocks close to at SD009-7,300 T sulfide, 28c) in N 23's of
the sil and have been metamorphosed: they with 0.23 0z/T b)Au-Ciz vein, _—tract, less inS
are inferred to have been Sierran-type Au, 0.31 0z/T Ag, 36a 13; extensive
massive sullide deposits. 0.7% Cu; SDO11- drilling
187,000 T with DOO, ‘, 016,
8.42% Zn,1.42% Cu,
0.43 oz/T Ag,
0.008 oz/T Au;
$D016,017-26.7
million T with
0.57% Cu, 0.37%
Zn, 0.3 o2/T Ag;
USBM has revised
inferred estim-
‘ates, but they are
not yet available.
O5SD Endicott Penin- ‘Au-Qtz and polymeteliic vein and possible SD019, 022-024, Production: a}Sierran mas- Reconnaissance
sula metamorphosed Sierran-type massive sulfi 026-035, 037-040 SD022 produced sive sulfide, geologic mapping
deposits occur in highly deformed and 24,000 oz Auand 28¢ and geochemical
variably metamorphosed Paleozoic and 24,000 oz Ag in b)Au-Otz veins, sampling by USGS
Mesozoic clastic, volcanic, and carbonate early 1900's; sev. 36a, intensely pros-
rocks that are intruded by Late Cretaceous eral Au-Qtz veins pected in early
granodiorite and tonalite plutons. in Windham Bay 1900's.
‘area each produced
afew 1,000 oz Au
at about the same
time, average Au
content about 0.25
Reserves: USBM
has inferred es-
timates for some
localities, but
they are not yet
available.
‘SITKA QUADRANGLE
13S! Admiratty Island Highly deformed and slightly metamor-  $1088-091, 093, Pyrola prospect a}Sierran massive Reconnaissance
Phosed Late Triassic mafic and inter- 004,087, 100- — (SI090) is best sulfide, 28c and some detail-
‘mediate volcanic rocks, fine-grained 103, 105-112. known and is prot b)Synorogenic- ed geologic and
clastic rocks, and ultramafic masses host, ably similarto —ssynvolcanic Ni geochemical map-
in diferent places, significant massive Greens Creek de- Cu, 7a ping by USGS; in-
sulfide, Ni-Cu magmatic segregation, and posit in Juneau tense private
polymetallic vein deposits. quad to N. prospecting loc-
ally in the past.

1%


quadrangles, southeastem Alaska: BC, Bradfield Canal; CR, Craig; DE, Dixon Entrance; JU, Juneau; KC, Ketchikan; MF, Mount Fairweather; PA, Port Alexander;

8
Accessibilty and related factors,
including percent of tract in dif-
ferent land status(es)

In part close to tidewater; some-
what rugged: steep brush- and
timber-covered slopes.

85% in USNPS Glacier Bay National

Park.
15% in USFS Pleasant-Le-
mesurier islands Wilderness.

‘Timber- and brush-covered; locally
steep; in part close to tidewater;
som in USFS South

Wildemess;
som USFS Tongass National
Forest.

Timber- and brush-covered; locally

‘steep; in part close to tidewater;

100% in USFS Tongass National
Forest.

Most subtracts close to tidewater;
some locally rugged and steep:
most have heavy brush and timber;
some logging roads in (B) and (C);
(C) 08% in USFS South
Etolin Wilderess;
(A), (8), (D), and remaining part of
(C): 82% in USFS Tongass National
Forest,

In part close to tidewater; some
parts steep and rugged; some thick
brush and timber; some logging

25% in USFS South Etolin
Wiklemess;

75% in USFS Tongass National
Forest.

Close to tidewater; local thick

brush and timber.

100% in USFS South Etolin
Wildemess.

In part close to tidewater; in part
remote: steep: very extensive

ly.
Lol in USFS Stikine-LeConte
Wildemess;

50% in USFS Tongass National
Forest.

9
‘Summary of undiscovered resource
information

Known deposits; permissive geology;
Cu, Zn, Pb, Sn, W
geochemical anomalies.

Permissive geology; Mo, W, Zn
‘stream-sediment anomalies in N part
‘of tract; Y, Nb to S; weak Mo, Zn,
Cu, Co bedrock anomalies in N part
of tract; As, Ag, Au, Pb, Cu in SW
part; Ag, As, Sb, Zn,Cu, Pb in SE
part.

Permissive geology; known deposit;

Mo stream-sediment anomaly; Ag, As,

‘Sb, Zn, Cu, Pb bedrock anomalies.

Permissive geology’; strong aeromag-
netic anomalies; local aeroradio-
activity anomalies; La, Nb, Y, Po
stream-sediment anomali
Y, Sn, Cu, Mo, La, 70, Crbadiec
anomalies.

Permissive geology; Cr, Ni, Mo, W,
Pb, Nb stream-sedment anomalies;
Cu, Pb, Au, Mo, Zr. Cr, Ni bedrock
anomalies.

Permissive geology; Cu, Mo, Ni
bedrock anomalies: very small
‘tract.

permissive geology:
, At siream-sediment
Ba, Zn, Co, Ni, Cr, Mo,
‘As bedrock anomalies;
strong ‘and steep eeromagnetic grad-
Quite well pic: oacted
large Weck

Known deposit
Ba, Pb, Zn, Au,
anomaies;
Pb, Cu, Ag,

10

Estimated number of undis- Grade

abl 12 13
Tract Remarks

covered deposits (% chance andton- area, in

that there are the number

given or more deposits)
95 90 50 10 05

aoo0123
bo 0123
joo008

ao 0001
b)0 001 2

ao 0001
b0 0012

ajo 0001
ao 0001

ao 000%
bo 00014

No estimate.

a0 0012
b)0 0 1 2 3
joo0o008

VW

nage mod- square
kilo-

et avail-

able? meters

Yes 4i3

Yes

Yes

Yes 263 Same resources as in
adjoining tract 04PE.

Yes

Yes 14 Same resources as in ad-
joining tract O8PA.

Yes

No (A) 28

(8) 80

Maybe — (C) 213

(0) 9
Tot. 330

Yes 316 Same undiscovered
resources as in adjoining

Yes tracts O9BC, O1KC,
and OSCR.

Yes 16 Same undiscovered
resources as in adjoining
tract O6CR.

Yes 407 Same undiscovered
resources as in adjoining

Yes tract O4SD.

Yes


Table 11s. Gross-in-place values (GIPV) calculated for those parts of individual
mineral-resource tracts that are totally or partially in parts of the
Tongass National Forest that are now open to mineral entry. (All
tonnages are metric. See text for complete explanation.)-Continued.

1 2 3 4 5
Map no. Name Tract GIPV Fraction of tract in Tract GIPV in
Tongass NF and that fraction

open to mineral entry

DIXON ENTRANCE QUADRANGLE-CONTINUED.

09DE Barrier Islands 2.29E+08 0.1 2.29E+07

10DE Southeastern- 6.68E+08 100 6.68E+08
most Prince of
Wales Island

JUNEAU QUADRANGLE

02JU Casement 1.08E+09 0.11 1.19E+08
Glacier

04JU Sullivan Island to 1.54E+08 0.76 1.17E+08
Sullivan River

05JU Excursion River 1.96E+07 0.25 4.90E+06

O6JU Nun Mountain 5.54E+07 0.9 4.99E+07

07JU Neka Bay, W of 4.40E+07 0.83 3.65E+07

11JU Kensington- 3.73E+08 0.33 1.23E+08
Jualin & Eagle

River-Juneau

13JU Juneau Icefield 2.41E+08 100 2.41E+08

KETCHIKAN QUADRANGLE

O8KC Southern 3.55E+07 0.5 1.78E+07
Revillagigedo
Island

10KC Boca de Quadra- 9.88E+08 0.6 5.93E+08
Quartz Hill

14KC Southwestern 1.44E+08 0.57 8.21E+07

Gravina Island-
Eastern Annette
Island

16KC Tongass Narrows 1.39E+08 0.2 2.78E+07

32


Table 11s.

Map no.

Gross-in-place values (GIPV) calculated for those parts of individual

mineral-resource tracts that are totally or partially in parts of the

Tongass National Forest that are now open to mineral entry. (All
tonnages are metric. See text for complete explanation.)-Continued.

2
Name

3
Tract GIPV

CRAIG QUADRANGLE-CONTINUED.

12CR

13CR
14CR

16CR

17CR
18CR
19CR
20CR

21CR
22CR
23CR
24CR
25CR

26CR
27CR

Kasaan
Peninsula

Baker Island

San Juan
Bautista Island

Black Lake-Lake
Saint Nicholas

Pin Peak
Maybeso Creek
Suemez Island
Trocadero Bay-
Cholmondeley
Sound

Copper Mountain
Dora Bay

Dolomi

Northern Dall

Southeast
Sukkwan Island

Moira Sound

Niblack

6.75E+09

9.75E+08
1.64E+07

1.56E+08

1.66E+08
3.26E+08
2.66E+08

2.22E+08

1.43E+09
5.30E+08
1.06E+08
2.11E+08
1.08E+08

8.07E+08
1.18E+08

DIXON ENTRANCE QUADRANGLE

O05DE
O06DE
08DE

Kassa Inlet
Bokan Mountain

Southern Dall
& Long Islands

1.04E+08
1.63E+09
1.39E+08

4
Fraction of tract in
Tongass NF and
open to mineral entry

0.35

100
100

0.3

0.5

0.6

100
0.62

0.6
0.7
0.73
0.55

0.65

0.5
100
0.6

i]

5
Tract GIPV in
that fraction

2.36E+09

9.75E+08

1.64E+07

4,.68E+07

8.30E+07
1.96E+08
2.66E+08
1.38E+08

8.58E+08
3.71E+08
7.74E+07
1.16E+08
7.02E+07

8.07E+08
1.18E+08

5.20E+07
1.63E+09
8.34E+07


Table 3s. Tongass National Forest and adjacent lands individual mineral-resource tract information for selected tracts in the following 1:250,000-scale
PE, Petersburg; SD, Sumdum:; SI, Sitka. See text of Brew and others (1901) for explanation of headings and sources of information. — Cawtiavecd,

1 2 7
No. Name Description, including geologic units and Mines, prospects, Production and Mineral deposit Status of geolo-
Map controls of deposits and occurrences other resource types expected gic, geochemical,
(numbers are from information (see table 1 and = and i
table 2-BC) Cox and Singer, information
1986)
CRAIG QUADRANGLE-CONTINUED.
18CR Maybeso Creek Ordovician shale and araywacke contain CR026-029, 032- Production: a) Porphyry Mo,
numerous polymetalic 7) veins. yey Several thousand 2b
0z Au 190010 —_b) Polymetallic
1940's. veins, 22c

DIXON ENTRANCE QUADRANGLE

O3DE South-central ‘Scattered and varied deposits in broad DEO0s None a) Kuroko massive Reconnaissance
Prince of Wales ‘expanse of Ordovician, Mississippian, and sutid, geologic and geo-
Island Devonian sedimentary and volcanic rocks chemical mapping

in Craig quad to N. Pah Polymetallic by USGS; some
vein, 2c prospecting.
¢) Porphyry Cu,
7
JUNEAU QUADRANGLE
osu ‘Admiralty Island Highly deformed and slightly metamorphos JU028-045 Significant past a)Sierran massive Reconnaissance

Late Triassic mafic and intermediate vol- Production from —_ sulfide, 28c and some detail-
canic rocks, fine-grained clastic rocks, polymetallic vein b)Synorogenic- ed geologic and
and ultramafic masses host, in different deposits JU032, synvolcanic Ni- geochemical map-
places, significant massive sulfide, Ni-Cu 034, 037; and Cu, 7a ping by USGS; in-
magmatic segregation. and polymetallic from synorogenic- tense private
vein its. syn-volcanic Ni- prospecting in

Cu deposit JU033. non-National

Reserves: JU033 Monument part of

contains discover- tract.

ed reserve of

‘about 560,000 T

with 0.35% Cu,

0.34% Ni, 0.15%

Co; it JUO4

has just started

production; it

has discovered

reserve of about

3.5 million T

with 3.9% Pb,

9.7% Zn, 23.8 oz/T

Ag,0.18 oz/T Au.

KETCHIKAN QUADRANGLE

O1KC Outer Etolin Mesozoic turbidites, other metasedimentary None None a)Polymetalic Reconnaissance
sland land metavolcanic rocks, and Cretaceous vein, 22¢ geologic and geo-

granitic rocks are intruded by Middle Tertiary b)W vein, 15a(7} chemical mapping
akalic and subalkalic granitic rocks, pro- by USGS; low
ducing permissive vein and skam environ- level of pros-
ments; intrusive rocks elsewhere (in tract pecting.

O5PE) have close relation to volcanic rocks.

VIKC ‘South-central ‘Scattered and varied deposits in broad None None a) Kuroko massive Reconnaissance
Prince of Wales expanse of Ordovician, Mississippian, and sulfide, geologic and geo-
teland Devonian sedimentary and volcanic rocks. 28a chemical mapping

b) Polymetaliic by USGS; some
vein, 2c ing.

¢) Porphyry Cu, 17

¢) Cu skam, 18


Table 5s. Undiscovered mineral-resource endowment of selected individual mineral-resource tracts, in metric tons; in all of
‘Tongass National Forest and adjacent lands, by the U.S. Geological Survey MARKS simulator for tracts entirely or principally within
each of the following1:250,000-scale quadrangles, southeastern Alaska: CR, Craig; MF, Mount Fairweather; PA, Port Alexander;
PE, Petersburg; SD, Sumdum; SI, Sitka:. See text of Brew and others (1991) for explanation. - Cauwt ra ved,

1 2 3 4 5 6 7 8 9
Map No. Name Mineral- Deposit © Commodity Metal content, Calculated Calculated grade, Tract tonnage
deposit tonnage in tons metal grade units as shown _totals in millions
type no. in percent
SUMDUM QUADRANGLE
04SD Tracy Amm- Sierran mas- 848450 Cu 14274 1.68325472 0.93757
Stikine River sive sulfide, Au 1.8788 0.00022156 2.21557 gion
28a 2n 32104 3.78584906
Ag 102.68 0.01210849 121.085 gtton
Pb 71785 0.84652123
‘Au-Qiz veins, 80147 Au 0.61658 0.00069201 6.92009 giton
36a Ag 0.11859 0.0001331 1.33098 gon
OSSD Endicott Penin- _Sierran mas- 264930 Cu 4384.7 1.65460377 0.32826
sula sive sulfide, Au 0.58875 0,00022217 2.2217 gion
28a ra 9096.4 3.77222642
Ag 32,629 001231283 123.128 gfton
Pb 2129.91 0.80373962
‘Au-Qiz veins, 63357 Au 0.49623 0.0007827 7.82697 ghon
SITKA QUADRANGLE
1381 Admiralty Island —_Sierran mas- 309480 Cu 5228.2 1.69197411 0.72407
sive sulfide, Au 0.68453 0.00022153 2.21531 gon
28a Zn 12512 4.04919094
Ag 39.911 0.01291618 129.162 gfton
Pb 2627.8 0.85042071
Synorogenic- 414610 Cu 2891.4 0.69672289
synvolcanic Ni- Au 0.0013153 3.1694E-07 3.1694 mgfton
Cu massive Ni 3490.3 0,84103614
suffide, 7a pt 0.00022565 5.4373E-08 0.54373 mgfon
Co 15.586 0.00375566
Pd 0.00065475, 1.5777E-07 1.57771 mgfton

aw


Table 9s. Metal tonnages and gross-in-place values (GIPV) calculated for those parts of selected individual

mineral-resource tracts that are totally or partially in the Tongass National Forest , south-
easter Alaska. (All tonnages are metric; see text for complete explanation of headings. Continued.

1 2
Map No. Name

SUMDUM QUADRANGLE

o4SD Tracy Arm-
‘Stikine River

05SD Endicott Penin-
sula

‘SITKA QUADRANGLE

13S! Admiralty Island

0.94
0.36

0.33
0.07

0.72
0.

in tons

5.42E+03
9.48E-01

1.22E+04
3.91E+01
2.73E+03

8.83E+02
2.35E-01
2.44E+03
1.44E+01
1.04E+03

1.30E+03
1,10E-01
2.00E+03
6.39E+00
4.20E+02
5.58E+02
3.61E-05
2.49E+00
1,05E-04

3 4 5 5a
Tract tonnage, Commodity Metal content, Commodity
in millions*

prices

2026.88
14.68
1035.47
0.37
837.19

2026.88
14.68
1035.47

837.19

2026.88
14.68
1035.47
0.37
837.19
6278.92
16.19
14760.96
4B

6
GIPV
commodity

1.10E+07
1.39E+07
1.26E+07
1.45E+07
2.28E+06

1.79E+06
3,44E+06
2.53E+06
5.33E+06
8.72E+05

2.63E+06
1.61E+06
2.07E+06
2.36E+06
3.52E+05
3.51E+06
5.85E+02
3.68E+04
4.57E+02

TOTAL GIPV OF ALL TRACTS, INCLUDING THOSE IN TABLE 9 OF BREW AND OTHERS (1991)

* Top number is from table 7; bottom number is that part of the total that is within the Tongass National Forest.

7
GIPV of
tract

5.43E+07

1.40E+07

1.26E+07

2.86E+10


Tongass Timber Reform Act Wilderness Areas Supplement to U.S. Geological Survey Open-File Report 91-10
(Undiscovered locatable mineral resources of the Tongass Nationa Forest and adjacent lands, southeastern Alaska)

By

David A. Brew and James L. Drinkwater

ABSTRACT

This report is a supplement to a much longer report on the undiscovered metallic mineral resources of the Tongass
National Forest and adjacent lands in southeastern Alaska (Brew and others, 1991). This report has two purposes: (1)
it revises the previous calculations of amount and gross-in-place-value (GIPV) of undiscovered resources in lands
open to mineral entry to reflect the six new Wilderness areas created by the Tongass Timber Reform Act of October
1990; and (2): it corrects two calculation errors in the previous report.

The revised figure for the GIPV of undiscovered metallic mineral resources in those parts of the Tongass National
Forest that are open to mineral entry is $23.5 billion; the previous figure was $24.4 billion. The revised figure for the
molybdenum endowment of those mineral-resource tracts that are wholly or partially in the Tongass National Forest is
345,000 metric tonnes and their GIPV is $4.35 billion; the previous figures were 490,000 metric tonnes and $6.19
billion, respectively. The revised figure for the GIPV of the thorium endowment of the mineral-resource tracts that are
wholly or partially in the Tongass National Forest is $1.49 billion; the previous figure was $1.49 million.

With the revised figures, the Tongass National Forest is now estimated to contain about 69 percent of the
endowment of the whole region and , in turn, the parts of the Forest now open to mineral entry are now estimated to
contain about 83 percent of the undiscovered metallic mineral resource endowment of the whole Tongass National
Forest.

DISCUSSION

As described at length in Brew and others (1991), southeastem Alaska is a geologically complex region that contains
a wide variety of known locatable metallic mineral deposits, some of which have produced very important amounts of
metals and other materials during the past 100-plus years. The Juneau district, the Chichagof district, the Kasaan
Peninsula Bokan Mountain, and the Hyder district are all well known productive localities. In recent years major new
discoveries have been made at the Green's Creek mine and the Quartz Hill molybdenite property.


the following 1:250,000-scale quadrangles, southeastern Alaska: CR, Craig; MF, Mount Fairweather; PA, Port Alexander;

sources given in table 3s.

8
Accessibility and related factors,
including percent of tract in dit-
ferent land status(es)

In part close to tidewater; heavy
timber, limited outcrop; pert has
logging roads.

02% in USFS Karta
River Widemess;

40% in Alaska Native lands;

58% in USFS Tongass National
Forest.

Close to tidewater in past; local-

ly steep; close to State roads;

also logging roads.

50% in Alaska Native lands;

20% in USFS Karta River
Wilderness;

30% in USFS Tongass National
Forest.

Close to tidewater in part; local-

ly steep; close to Stale roads;

also logging roads.

25% in Alaska Native lands;

25% in USFS Karta River
Wildemess;

50% in USFS Tongass National
Forest.

Close to tidewater in part; local

ly steep; close to State roads;

also logging roads.

15% in Alaska Native lands;

25% in USFS Karta River
Wildemess;

60% in USFS Tongass National
Forest.

In part close to tidewater, some-

what rugged: steep brush- and

timber-covered slopes.

85% in USNPS Glacier Bay
Park.

National
15% in USFS Pleasant-
Lemesurier Islands Wilderness.

Most subtracts close to tidewater;
‘some locally rugged and steep:

most have heavy brush and timber,
‘some logging roads in (B) and (C);
08% in USFS South Etolin

Wilderness;
92, in USFS Tongass National
Forest.

9
‘Summary of undiscovered resource
information

Kaown deposits; permsive geology:
numerous Cu geochem anomali
scattered Pb, Zn, Ba, Ag anomalies:

very large tract.

Known occurrences; permissive geol-
‘egy; Mo geochem anomalies; moder-
ate size tract.

Known occurrences; permissive geol-
‘ogy; Mo geochem anomalies; small
tract.

Known deposits: permissive geo
ogy: widespread Zn, Pb, Mo, Cu
geochem anomalies; small tract.

Known deposits; permissive geology:

Cu, Zn, Pb, Sn, W
geochemical anomaties.

Permissive geology; strong aeromag-
netic anomalies; local aeroradio-
activity anomalies; La, Nb, Y, Pb
stream-sediment anomalies; Be, Nb,
Y, Sn, Cu, Mo, La, Co, Cr bedrock
anomalies.

Estimated number of undis-
covered deposits (% chance
that there are the number
given or more deposits)

95 90 50

ayo
b)o
0
do

ayo
b)o

ayo
bo

ayo
bo

0

ajo

a)

oe

oo

1$

10

10

a NY © ow

05

1
Grade
and ton-
nage mod-
el avail
able?

Yes
Yes
Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes
Yes

Yes

FF

12 13
Tract Remarks and references
area, in to tracts in table 3.
square
kilo-
meters

CR 1,606 Includes tracts O3DE,
DE 01 10CR, and 11KC.
KC Ot

Tot.1,608

413

(A) 28

@®)

(C) 213
(0) 9
Tot 330


the following 1:250,000-sale quadrangles
Conde

sources given intable 3s. —

8
Accessibility and related factors,
including percent of tract in dif-
ferent land status(es)

In part close to tidewater; some
parts steep and rugged; some thick
brush and timber, some logging
roads.

20% in USFS South Etolin
Wikderess;

80% in USFS Tongass National
Forest.

‘Close to tidewater; local thick

brush and timber.

100% in USFS South Etolin
Wilderness.

in part close to tidewater; in part

remote; steep; very extensive

glacier cover.

38% in USFS Tracy Arm-Fords Ter-
ror Wiklemess;

03% in USFS Chuck River
Wilderness;

18% in USFS Stikine-LeConte
Wildemess;

44%, in USFS Tongass National
Forest.

In part close to tidewater, in part

heavily bush- and timber-covered.

50% in USFS Chuck River
Wilderness;

50% in USFS Tongass National
Forest.

awed.

9
‘Summary of undiscovered resource:
information

Permissive geology; Cr, Ni, Mo, W,
Pb, Nb stream-sedim nt anomalies;
Cu, Pb, Au, Mo, Zn, Cr, Ni bedrock
anomalies.

Permissive geology; 2u, Mo, Ni
bedrock anomalies; very small
tract.

‘Significant known deposits; permis-
‘sive geology; large tract; signi
icant geochemical anomalies;
strong and sleep aeromagnetic
gradient; quite well prospected
focally.

Significant known deposits; permis-
sive geology; large tract; signi

icant anomalies;
quite well prospecied locally.

}, Southeastern A.aska: CR, Craig; MF, Mount Fairweather, PA, Port Alexander,

10

Estimated number of undis- Grade
covered deposits (% chance and ton-
that there are the number nage mod-
given or more deposits) el avail
95 90 50 10 05 able?
aoo0o001 Yes
b)0 0001 Yes

No estimate. Yes
aoo12 4 Yes
00001 Yes
aooo12 Yes
b0 0001 Yes

17

12
Tract
area, in
square

SD 705
PE 407
Tot 1,112

537

13
Remarks and references
to tracts in table 3.

Includes tracts O9BC,
O1KC, OSCR, and 15PE.

Includes tracts O6CR and
16PE.

Includes tracts 18PE
and 04SD.


Table 6s. Commodity prices used in calculation of gross-in-place value of undiscovered mineral resources, Tongass
National Forest and adjacent lands. (Prices are averages for the decade 1978-1987, based on U.S. Bureau
of Mines (1983, 1988). Prices have been rounded to two places. The following conversions were used:
0.9078 mt = 1 st, 1 kg = 2.2 Ib, 1 st = 2,000 Ib, 1 stu = 20 Ib, 31.1 g = 1 troy oz; from Coldwell (1990). Prices
for antimony and tin calculated specifically for this report by a method similar to that of the USBM).

Table 7s. Metal tonnages and gross-in-place values (GIPV) calculated for selected individual mineral-resource tracts,
in all of Tongass National Forest and adjacent lands, southeastern Alaska, in the following 1:250,000-scale
quadrangles: CR, Craig; MF, Mount Fairweather; PA, Port Alexander; PE, Petersburg; SD, Sumdum; SI,
Sitka; all tonnages are metric; see text of Brew and others (1991) for explanation.

Table 8s. Aggregated metal tonnages and gross-in-place values (GIPV), on a commodity-by-commodity basis, of
undiscovered mineral resources, in all of Tongass National Forest and adjacent lands, southeastem Alaska;
all tonnages are metric; see text of Brew and others (1991) for explanation.

Table 9s. Metal tonnages and gross-in-place values (GIPV) calculated for those parts of selected individual mineral-
resource tracts that are totally or partially in the Tongass National Forest, southeastern Alaska; in the following
1:250,000-scale quadrangles: CR, Craig; MF, Mount Fairweather; PA, Port Alexander; PE, Petersburg; SD,
Sumdum; SI, Sitka;all tonnages are metric; see text of Brew and others (1991) for explanation.

Table 10s Aggregated metal tonnages and gross-in-place values (GIPV), on a commodity-by-commodity basis, for
those parts of mineral-resource tracts that are totally or partially in the Tongass National Forest, southeastern
Alaska; all tonnages are metric; see text of Brew and others (1991) for explanation.

Table 11s. Gross-in-place values (GIPV) calculated for those parts of selected individual mineral-resource tracts that
are wholly or partially in parts of the Tongass National Forest, southeastern Alaska, that are now open to
mineral entry; all tonnages are rv atric; see text of Brew and others (1991) for explanation.


Table 8s. Aggregated metal tonnages and gross-in place values (GIPV),
on a commodity-by-commodity basis, of undiscovered mineral resources,
in all of Tongass National Forest and adjacent lands, southeastern Alaska.
(All tonnages are metric; see text for complete explanation).

1 2 3 4
Commodity Metal content, Commodity GIPV
in tons prices Commodity
Cu 5.04E+06 2026.88 1.02E+10
Mo 4.45E+05 12601.89 5.61E+09
Au* 1.68E+02 14.68 2.46E+09
Zn 2.22E+06 1035.47 2.30E+09
Ag* 7.55E+03 0.37 2.79E+09
Pb 1.19E+06 837.19 9.98E+08
Fe 1.29E+08 72.54 9.38E+09
Th** 1.67E+05 9.75 1.63E+09
REE 1.42E+05 12447.68 1.77E+09
U 2.77E+03 36682.09 1.02E+08
Ni 2.65E+04 6278.92 1.66E+08
Pt* 1.58E-03 16.19 2.56E+04
Co 1.21E+02 14760.96 1.79E+06
Pd* 5.41E-03 4.36 2.36E+04
Sb 6.20E+01 3652 2.26E+05
Sn 1.81E+05 18964 3.43E+09
Ww 2.50E+03 3453.4 8.63E+06
Total*** 1.39E+08 4.09E+10

*, Commodity priced in grams
** Commodity priced in kilograms
***, Discrepancy from Total of 4.08E+10 in Table 7s is due to rounding procedures


CONTENTS

ABSTRACT Page 4
DISCUSSION Page 4
REFERENCES CITED Page 5

ILLUSTRATION LIST

Figure 1s. Map of southeastern Alaska, showing location of Tongass National Forest lands open for mineral entry,
Tongass National Forest lands in Wilderness status, U.S. National Park Service lands, State of Alaska,
Sealaska Native Corporation, and private lands. All boundaries are approximate; some areas are too small to
be depicted at this scale. Information from U.S. Forest Service (1990), other sources, and U.S. Forest
Service (written communications, November 1990, May 1991).

TABLE LIST

Table 3s. Tongass National Forest and adjacent lands individual mineral-resource tract information for selected tracts
in the following 1:250,000-scale quadrangles, southeastern Alaska: BC, Bradfield Canal; CR, Craig; DE,
Dixon Entrance; JU, Juneau; KC, Ketchikan; MF, Mount Fairweather; PA, Port Alexander; PE, Petersburg;
SD, Sumdum; SI, Sitka. See text of Brew and others (1991) for explanation.

~ able 4s. Tongass National Forest and adjacent lands individual mineral-resource tract information for selected tracts
entirely or principally within the following 1:250,000-scale quadrangles, southeastern Alaska: CR, Craig; MF.
Mount Fairweather; PA, Port Alexander; PE, Petersburg; SD, Sumdum; SI, Sitka;. See text of Brew and
others (1991) for explanation.

Table 5s. Undiscovered mineral-resource endowment of selected individual mineral-resource tracts, in metric tons; in
all of Tongass National Forest and adjacent lands, by the U.S. Geological Survey MARKS simulator for tracts
entirely or principally within eaut, of the following1:250,000-scale quadrangles, southeastern Alaska: CR,
Craig; MF, Mount Fairweather; PA, Port Alexander; PE, Petersburg; SD, Sumdum; SI, Sitka;. See text of
Brew and others (1991) for explanation.


Table 11s. Gross-in-place values (GIPV) calculated for those parts of individual
mineral-resource tracts that are totally or partially in parts of the
Tongass National Forest that are now open to mineral entry. (All
tonnages are metric. See text for complete explanation.)-Continued.

1 2 3 4 5
Map no. Name Tract GIPV Fraction of tract in Tract GIPV in
Tongass NF and that fraction

open to mineral entry

SUMDUM QUADRANGLE-CONTINUED.

05SD Endicott Penin- 6.98E+07 0.5 3.49E+07
sula

06SD Dawes Glacier- 2.08E+07 0.95 1.98E+07
Buddington
Range

SITKA QUADRANGLE

01S! Yakobi-Mirror 1.32E+08 0.5 6.60E+07
Harbor

02S! Yakobi- 1.37E+08 0.4 5.48E+07
Chichagof

03S! Lisianski Inlet 4.49E+07 0.32 1.44E+07

04S! Lake ElfindahL, Rust 1.04E+09 0.48 4.99E+08

mountain, Granite
Islands, Deep Bay,
Krusof island,
Takatz Bay and
Trap Bay, Crawfish
Inlet-Gut Bay, Red-

fish Bay

07s! Tam Mountain, 1.55E+08 1 1.55E+08
Moore Mountains

oss! Tenakee Inlet, S 2.92E+07 1 2.92E+07
of head of

10S! Seal Creek 5.49E+07 1 5.49E+07

11S Tenakee-Sitkoh 1.05E+08 1 1.05E+08
Bay

13S Admiralty island 7.86E+07 0.16 1.26E+07

SKAGWAY QUADRANGLE

16SK Skagway River 9.95E+08 0.5 4.98E+08


Table 10s. Aggregated metal tonnages and gross-in-place values (GIPV), on
acommodity-by -commodity basis, for those parts of mineral-resource tracts
that are totally or partially in parts of the Tongass National Forest, south-
eastern Alaska. (All tonnages are metric; see text for complete explanation)

1 2 3 4
Commodity Metal content, Commodity GIPV
in tons prices Commodity
Cu 3.37E+06 2026.88 6.83E+09
Mo 3.45E+05 12601.89 4.35E+09
Au* 1.20E+02 14.68 1.76E+09
Zn 1.34E+06 1035.47 1.39E+09
Ag* 5.40E+03 0.37 2.00E+09
Pb 7.02E+05 837.19 5,88E+08
Fe 6.37E+07 72.54 4.62E+09
Th** 1.53E+05 9.75 1.49E+09
Re 1.30E+05 12447.68 1.62E+09
U 2.54E+03 36682.09 9.32E+07
Ni 2.28E+04 6278.92 1.43E+08
Pt® 1.42E-03 16.19 2.30E+04
Co 1.01E+02 14760.96 1.49E+06
Pd* 4.91E-03 4.36 2.14E+04
Sb 6.20E+01 3652.00 2.26E+05
Sn 1.81E+05 18964.00 3.43E+09
WwW 2.50E+03 3453.40 8.65E+06
Total*** 7.00E+07 2.83E+10

*, Commodity priced in grams

** Commodity priced in kilograms

*** Discrepancy from Total of 2.86E+10 in Table 9s is due to rounding procedures
and a possible sought-for, but-as-yet-unfound, error!

29


quadrangles, southeastern Alaska: BC, Bradfield Canal; CR, Craig; DE, Dixon Entrance; JU, Juneau; KC, Ketchikan; MF, Mount Fairweather; PA, Port Alexander;

a
Accessibility and related factors,
including percent of tract in dit-
ferent land status(es)

In part close to tidewater; local-

ty heavy timber, steep in part;

100% in USFS Admiralty Island
National Monument and

In part close to tidewater; in part
remote; steep; very extensive
glacier cover.

bon Waa USFS rs Tracy Arm-Fords Ter-

05% in nOSrS ch Chuck River
Wiklerness.

35% in USFS Tongass National
Forest

In part close to tidewater; in part

heavily bush- and timber-covered.

50% in USFS Chuck River
Wiklemess;

50% in USFS Tongass National
Forest.

In part close to tidewater; local-
ly heavy timber,

it r, Steep in part;
05% in USFS Admiraky Island Na-

tonal Monument and Wider-

05% 0 the above is covered by
Alaska Native lands.

9
‘Summary of undiscovered resource
information

Significant known deposits; permis-
sive geology; abundant and varied
geochemical anomalies; relatively
well prospected locally.

Significant known deposits; permis-
sive geology: large tract; signi
icant geochemical anomalies;

strong and steep aeromagnetic
gradient; quite wel! prospected
locally.

Significant known deposits; permis-

tar geochemical anorali
lies:

quite well prospected locally.

Significant known weposits; permis-
sive geology; abundant and varied

ical anomakes; relatively
well prospected locally.

10 "1

Estimated number of undis- Grade
covered deposits (% chance and ton-
fage mod- square
kilo
meters

that there are the number

given or more deposits) el avail-
95 90 50 10 05 able?
aooo013 Yes
b0 0001 Yes
aoo124 Yes
b0 0001 Yes
a0 0012 Yes
b0 0001 Yes
aooo013 Yes
b0 0001 Yes

43

12 13
Tract Remarks
area, in

12 Same undiscovered
resources as in adjoin-
ing tract 13SI.

705 Same undiscovered
resources as in adjoin-
ing tract 18PE.

1546 Same undiscovered
resources as in adjoining
tract OU.


Table 4s. Tongass National Forest and

lands individual mineral-resource tract information for selected tracts entirely of principally within

adjacent
PE, Petersburg; SD, Sumdum; Si, Sitka;. See texi of Brew and others (1991) for explanation of headings. Information for tracts taken from

1 2
MepNo. Name

4
Mines, prospects,
and occurrences
(numbers are {rom
table 2; locations
are given on plate 3)

3
Description, including geologic nits and
controls of deposits

PETERSBURG QUADRANGLE-CONTINUED.

15PE Outer Etolin

16PE Canoe Passage

SUMDUM QUADRANGLE

04SD Tracy Arm-
Stikine River

O5SL Endicott Penin-
sula

Mesozoic turbidites, other met>sedimentary None
and metavolcanic rocks, and Cretaceous

granitic rocks are intruded by Niddle Tertiary
alkalic and subalkalic granitic rocks, pro-

ducing permissive vein and skam environ-

ments; intrusive rocks elsewhere (in tract

OSPE) have close relation to volcanic rocks.

Fauh cuts Cretaceous turbidites intruded None
by Late Cretaceous tonalite and Middle
Tertiary granite.

Deformed and metamorphosed Paleozoic © SD006,008,009-011,

and Mesozoic clastic and volcanic rocks are 015-017, 021, 025,
intruded by latest Cretaceous-eartiest 036, PEOS4
Tertiary great tonaite sill; known sulfide

deposits are in metamorphi." ocks close to

the sill and have been metamorphosed; they

are inferred to have been Sierran-type

massive sulfide deposits.

‘Au-Quz and polymetaliic vein and possible SD019, 022-024,
metamorphosed Sierran-type massive sulfid« 026-035, 037-040
deposits occur in highly deformed and vari-

ably m Paleozoic and Mesozoic

clastic, volcanic, and carbonate rocks that

are intruded by Late Cretaceous granodior-

ite and tonalite plutons.

16

5 6
Production and Mineral deposit
other resource types expected
information (00 table 1 and
Cox and Singer,
1086)
None 8)Polymetallic
vein, 22¢
b)W vein, 15a(?)
None Polymetallic
vein, 22¢
Production: at )Metamorphosed
SD036, 500z Auin massive sulfide,
early 1900's. RMMS (model as
Reserves: ‘Sierran massive
at SD009-7,300T sulfide, 28c)
with 0.23 oz/T b)Au-Qiz vein,
Au,0.310z/T Ag, 36a
0.7% Cu; SDO11-
187,000 T with
3.42% Zn,1.42% Cu,
0.43 o2/T Ag, 0.008
oz/T Au; SD016,
017-26.7 million T with
0.57% Cu, 0.37% Zn,
0.3 oz/T Ag; USBM
has revised inferred
‘estimates, but they
are not yet available.
Production: a)Sierran mas-
D022 produced _—sive sulfide,
24,000 oz Au and 28
24,000 oz Ag in _b)Au-Qtz veins,
early 1900's; sev- 3a
eral Au-Qtz veins
in Windham Bay
area each produced
afew 1,000 oz Au
‘at about the same
time, average Au
content about 0.25
oz/T.
Reserves: USBM
has inferred es-
timates for some
localities, but
they are not yet

7
Status of geolo-
gic, geochemical,

Reconnaissance
geologic and geo-
chemical mapping
by USGS; low
level of pros-
pecting.

Reconnaissance
geologic and geo-
chemical mapping
by USGS; low
level of pros-
pecting.

Reconnaissance

geologic mapping

and geochemical

sampling by USGS.

in N hall of

tract, less in S

half; extensive

drilling at

SD009, 011, 016,
17

Reconnaissance
geologic mapping
and geochemical
sampling by USGS;
intensely pros-
pected in early
1900's.