Synonyms, Owners, Operators, and Claim Names

Alvenco, Inc. -- see (Threesome Mtn.)

American Exploration & Mining Co. -- see (Nunatak)
Bjorn -- see (Adams Inlet)

(Boussole Bay) -- see (Pacific beach sands)

(Brady Glacier outwash) -- see (Taylor Bay)

Bruce -- see (Bruce Hills)

Challenger -- see Rambler

Christmas -- see (Lemesurier I.)

Churchill -- see Richtmeyer

Cities Service Minerals Corp. -- see (Brady Glacier)
(Coal Cr.) -- see (Lituya Bay)

(Crillon Inlet, west side) -- see (Lituya Bay)
Dodson -- see Monarch

Dog -- see (Bruce Hills)

(Echo Cr.) -- see (Pacific beach sands)

Enterprise see (Lemesurier I.)

(Fall Cr.) -- see (Lituya Bay)

Fremont Mining Co. -- see (Brady Glacier

Gold Reserve Mining Co. -- see (Pacific beach sands)

Ibach -- see Galena, Hopalong, Incas, (Lemesurier I.), Marvitz, Monarch,
Rainbow, Sentinel, Whirlaway

Ibach & Beach -- see Highland Chief, Incas, Monarch, Sunrise

Ibach & Ibach -- see Incas, Monarch, Sunrise

Ibach & Smith -- see Galena, Rainbow

Joe's Dream -- see Highland Chief

Johnson & Smith -- see (Nunatak)

(Kashoto Glacier) -- see (Johns Hopkins Inlet)

Koby -- see (Geikie Inlet)

LeRoy Mining Co. -- see Incas, LeRoy, Rainbow

Lincoln -- see LeRoy, Marvitz

Little Jennie -- see (Rendu Inlet)

Lituya Bay Gold Mining Co. -- see (Lituya Bay)

Manville & Smith -- see (Francis I.)

Martin -- see (Dundas R.)

Moly -- see (Threesome Mtn.)

Mount Fairweather Mining Co. -- see Monarch

(Mt. Merriam) -- see (Queen Inlet)

Mount Parker Mining Co. -- see LeRoy

Muir -- see (Nunatak)

(Muir Inlet) -- see (Nunatak)

Nature Conservancy (League) -- see Alaska Chief

Newmont Exploration Co. -- see (Brady Glacier)

Newmont Mining Co. -- see (Brady Glacier), Highland Chief, Rainbow,
Rambler, Sentinel

Newsboy -- see unnamed occurrence at 58923'N, 136°37'W

Nuna -- see (Nunatak)

Nunatak (claim) -- see (Brady Glacier)

0.K. -- see (Nunatak)

Parker, A. L., (, & Parker, A. F.) -- see LeRoy

Presbyterian Home for Elders -- see (Rendu Inlet)

A19


crosscut, and stopes. Ore also mined from pit at SW end of altered zone.
Altered rock along fault contains a little gold. Total production not
known, but probably second only to LeRoy mine in Reid Inlet area. Samples
contained as much as 10.211 oz gold and 2.043 oz silver per ton; 1,500 ppm
As; 500 ppm Pb; and 2,000 ppm Zn. Sphalerite and galena assumed to be
present. See also LeRoy.

Rambler Gold, Lead, Silver, Zinc
Juneau district Mt. Fairweather (14.7, 14.95)
MF-436, loc. 23 58°50'N, 136°53'W

Veins that pinch and swell (about an inch to 3 ft) cut granodiorite that
contains screens of metamorphic rock and is cut by mafic dikes contain
quartz, calcite, feldspars, barite, arsenopyrite, pyrite, galena, and
traces of gold. Highest assay of samples taken during U.S. Bureau of
Mines investigation was 6.45 oz gold and 1.72 oz silver per ton from a
width of 0.35 ft in a vein about 1 ft thick; other samples all much less
rich; extent of vein not known. Float contains abundant galena and
sphalerite and considerable free gold.

(Red Mtn.) Cadmium, Zinc

Juneau district Mt. Fairweather (22.15, 17.25)
MF-436, loc. 44 58°58'N, 136°03'W

Small pods and impregnations in Middle Devonian limestone near a grano-
diorite cupola. Encrustations of a secondary zinc mineral. A sample
contained 7,000 ppm Zn, 500 ppm Pb, 70 ppm Cd, and a trace of Ag. Depos-
its too small to be of economic interest.

(Reid Glacier, east of head) Copper, Gold, Silver

Juneau district Mt. Fairweather (15.8, 13.95)
58°47'N, 136°46'W

Pyrite, arsenopyrite, and chalcopyrite in bands as much as 3 ft wide in
garnet-epidote skarn. Samples contained as much as 0.15 ppm Au and 1.5

ppm Ag.

(Rendu Inlet) Cobalt, Copper, Iron, Molybdenum,

Silver

Juneau district Mt. Fairweather (16.4-16.95,
16.2-16.55)

MF-436, locs. 30-33 58°55'-58°56'N, 136°38'-136°41'W

2 claims patented in 1895 as a silver prospect; now owned by National
Park Service. Developed by a short adit from which some ore may have
been taken before 1900, carbonate-quartz vein about 6 in thick along con-
tact between marble and a diorite dike and several feet of altered wall


Metallic minerals in thin quartz veins, in disseminated deposits, and as
mineralized fracture coatings. Near a steep fault zone (with a few branch-
ing faults) in granodiorite with a few small hornfels roof pendants and cut
by a few andesite dikes. Ore minerals, associated with pyrite and(or)
pyrrhotite, include chalcopyrite, molybdenite, and malachite and minor
amounts of molybdite, sphalerite, and galena. Analyses of samples showed
as much as 3 ppm Ag.

(Contact nunatak) Gold

Juneau district Mt. Fairweather (15.7, 12.75)
58°43'N, 136°47'W

0.10-0.20 ppm Au in samples of hornfels containing pyrite and pyrrhotite.
Hornfels in bands of limestone near granodiorite.

(De Langle Mtn.) Iron, Titanium
Yakutat district Mt. Fairweather (14.5, °7.3)

58°24'N, 136°55'W

Magnetite-rich zones in Astrolabe-De Langle layered gabbro stock; probably
contain about 10% Fe; one band 2 ft wide and 225 ft long said to contain
about 64% Fe, 20% Ti, and 0.28% Ni.

(Desolation Glacier) Copper, Gold, Nickel

Yakutat district Mt. Fairweather (8.45, 13.7)
58°47'N, 137°33'W

Mafic dike 5-6 ft wide and exposed for about 200 ft contains disseminated
nickeliferous pyrrhotite, pyrite, and chalcopyrite. Analysis said to have
shown 0.59% Ni, 0.62% Cu, and 0.01 oz Au per ton.

(Dundas Bay) Copper, Gold, Iron
Juneau district Mt. Fairweather (18.55-21.4, 6.4-7.0)
MF-436, locs. 57, 58, 60 58°21'-58°23'N, 136°11-'136°29'W

Pods of pyrite and minor chalcopyrite in quartz-rich metamorphic rocks in
contact with metabasalt. Samples contained traces of Ag, Mo, and Pb; min-
erals carrying these metals not identified. Thin quartz veins about a
foot apart also carry Cu and Mo. Lode gold and iron (probably magnetite-
rich skarn) reported by reliable observers. See also Iron Mountain.

(Dundas Bay, East Arm) Gold, Molybdenum, Tungsten

Juneau district Mt. Fairweather (17.8, 8.3)
58°28'N, 136°34'W

A4


Red Top -- see unnamed occurrence at 58°923'N, 136°37'W

Schlotter -- see (Triangle I.)

Sentinal -- see Sentinel

Silver Dick -- see (Rendu Inlet)

Silver, "Doc'' -- see unnamed occurrence at 58°23'N, 136°37'W

Smith -- see (Willoughby I.)

Spring Maid -- see (Adams Inlet)

Sullivan -- see Marvitz

Sunrise (claim) -- see unnamed occurrence at 58°23'N, 136°37'W
Superior Oil Co. -- see (Nunatak)

Treadwell Yukon Co. -- see (Willoughby I.)

Triton -- see (Nunatak)

Union Pacific Mining Corp. -- see (Brady Glacier)
Vevelstad (& Comstock) -- see (Nunatak)
Vevelstad, C. -- see (Nunatak)

Vevelstad, S. H. P. -- see (Surge Bay)

Walper -- see (Nunatak)

Whitney -- see (Lemesurier I.)

(Willoughby Cove) -- see (Lemesurier I.)

Yehring -- see (Geikie Inlet)

A20


(Triangle I.) Molybdenum

Juneau district Mt. Fairweather (17.85, 17.05)
MF-436, loc. 38 58°57'N, 136°32'W

Island is fine-grained granodiorite cut by a few aplitic dikes. A few
hundred pounds of molybdenite was found; most was removed by one man in
one day.

Valley of Tears Gold

Juneau district Mt. Fairweather (19.6, 9.3)
58°31'N, 136°22'W

Placer claims in reworked glacial material. A little gold present. May
be the same as (Dundas R.) occurrence. See also (Dundas R.)

(Wachusett Inlet) Copper, Molybdenum, Silver

Juneau district Mt. Fairweather (19.45, 17.05)
58°57'N, 136°21'W

Quartz vein as much as 0.7 ft wide and 50 ft long; in quartz diorite;
contains pyrite, molybdenite, chalcopyrite, and secondary iron minerals.
Samples contained as much as 74,000 ppm Cu, 1,500 ppm Mo, and 30 ppm Ag.
Assuming a mining width of 4 ft, deposit contains an inferred 800 tons
with an average sample assay of 0.44% Cu, 0.005% Mo, and 0.034 oz Ag per
ton. Not of economic size or grade. Data in MacKevett and others, 1971
(P 632), and Brew and others, 1977 (OF 77-494), do not agree well.

Whirlaway Gold
Juneau district Mt. Fairweather (15,6, 15.1) approx.
MF-436, loc. 27 58°51'N, 136°47'W approx.

Vertical quartz-calcite veins as much as 1 ft thick in fine-grained dio-
rite or quartz diorite contain uncommon pyrite and arsenopyrite. Gold
reported from weathered surficial parts of veins.

(Willoughby I.) Antimony, Copper, Gold, Lead, Silver

Juneau district Mt. Fairweather (21.55-21.75,
10.75-10.9)

MF-436, locs. 48, 49 58°36'N, 136°07'-136°08'W

Island mainly limestone (marble in places) cut by lamprophyre dikes.
Deposit in northeast part of island is on replacement body of pyrite,
16llingite, and chalcopyrite. Deposit on southwest side of island is at
intersection of 2 lamprophyre dikes; sulfides include chalcopyrite, pyrite,
and tetrahedrite, some of which are argentiferous; some silver ore reported
to have been mined. Sample contained 25% Pb, 25% Sb, and 1.74 oz gold and
42 oz silver per ton. Jamesonite also reported.

Al7


(Miner I.) Gold(?)

Chichagof district Mt. Fairweather (20.1, 0.5)
58°O1L'N, 136°21'W

Gold prospect in albite quartz diorite. This may be the same as (Yakobi
I.)3; reference in Buddington and Chapin, 1929 (B 800), p. 378 is very
sketchy.

Monarch Gold, Lead, RE
Juneau district Mt. Fairweather (14.95, 15.4)
MR-436, loc. 19 58°52'N, 136°51'W

Altered zones in granodiorite contain quartz lenses and thin veins with
gouge. Some of altered granodiorite contains allanite; quartz contains
arsenopyrite, pyrite, galena, and free gold. Explored by 2 adits about
210 and 120 ft long, short drifts, and a small stope. Ore, mainly weath~
ered material from surface at Monarch No. 1 workings, taken to Lemesurier
I. for milling; operation not profitable. Deposits discovered in 1924;
development and mining from about 1941 to 1947 or 1948.

(Mt. Fairweather) Chromite, Copper, Nickel, Platinum

Yakutat district Mt. Fairweather (8.25, 15.75) approx.
58°54'N, 137°36'W. approx.

Float specimens of material from layered mafic and ultramafic pluton
that underlies about 15 square miles high on SW flank of Mt. Fairweather
contained chalcopyrite, cubanite, pyrrhotite, pentlandite, chromite, mag-
netite, ilmenite, platinum-group metals, and as much as 200 ppm cobalt.

(Mt. Marchainville) Copper, Iron, Titanium
Yakutat district Mt. Fairweather (13.0, 8.4)
MF-436, loc. 7 58°29'N, 137°05'W

Samples of a 50-ft-thick layer in Crillon-La Perouse stock near contact
contained as much as 11.4% ilmenite; a little garnet in rock. Copper-
stained gneiss along contact.

(Mt. Orville) Molybdenum(?)
Yakutat district Mt. Fairweather (11.25, 12.65)

58°43'N, 137°16'W

Molybdenite or graphite in rock fragment from iron-stained zone on an
aréte.



phyric dikes. Assay of a sample where vein is 12 in thick showed 0.16 oz
gold and 0.30 oz silver per ton and 0.79% zinc. Vein contains abundant
pyrite, sphalerite, and galena. About 30 tons of ore (probably decomposed
surface material) was reported to have been mined in 1939.

(Geikie Inlet) Chromite, Gold, Molybdenum
Juneau district Mt. Fairweather (18.05-18.4, 10.5)
MF-436, loc. 52 (in part) 58°35'N, 136°30'-136°32'W

Molybdenite in tactite reported before 1930. Chromite with subordinate
clinochlore in blebs in lamprophyre dikes in diorite near a dunite body;
chip sample of dike carries 0.01 ppm Au. Includes reference to Yehring.

(Gilbert I.) Copper, Gold, Lead, Molybdenum, Silver,
Zinc

Juneau district Mt. Fairweather (17.25-17.8, 13.75-14.55)

MF-436, locs. 34-36 58°46'-58°49'N, 136°33'-136°36'W

Stockworks of quartz veinlets in bleached and altered quartz diorite in

west and southwest parts of island and on a small adjacent unnamed island
contain chalcopyrite and molybdenite and as much as 0.292 oz silver a ton.
Also reported are tetrahedrite, galena, sphalerite, pyrite, and free gold.

Highland Chief Gold, Lead, Silver
MF-436, loc. 24
Juneau district Mt. Fairweather (15.0, 14.95)

S8°SL'N, 136°S1'W

Country rock is amphibolite, schist, and marble locally intruded by sali-
ents of granodiorite. Veins that contain free gold are as much as 2 ft
thick (one is as mich as 6 ft thick) and can be traced for as much as 700
ft; covered at south ends. Some samples (collected in 1978) contained
arsenopyrite and galena; one sample 0.3 ft long assayed 3.49 oz gold and
1.25 oz silver per ton; most were much leaner. Prospect would be promis-
ing if less inaccessible; snow covered for much of the year.

Hopalong Gold
Juneau district Mt. Fairweather (15.6, 15.1) approx.
MF-436, loc. 27 58°S1'N, 136°47'W. approx.

Vertical quartz-calcite veins as much as one foot thick in fine-grained
diorite or quartz diorite contain uncommon pyrite and arsenopyrite.
Gold reported to have been recovered from weathered surficial parts of
veins.

Incas Gold

Juneau district Mt. Fairweather (15.1, 15.3)
MF-436, loc. 27 58°52'N, 136°50'W.

A6


Skarn developed in unassimilated limestone inclusion in Cretaceous diorite
at contact with Tertiary granite contains powellite; chip sample contained
0.20 ppm Au. Stream-sediment samples from vicinity contained powellite
and scheelite. Float contains molybdenite.

(Dundas Bay, West Arm) Cobalt, Copper, Silver
Juneau district Mt. Fairweather (18.35, 6.5)
MF-436, loc. 55 58°25'N, 136°30'W

Chalcopyrite and other sulfide(s) in hornblendite dikes in a gneissic
dioritic rock that locally is garnetiferous. Samples contained 18,000 ppm
Cu, 3 ppm Ag, and 700 ppm Co.

(Dundas R.) Gold
Juneau district Mt. Fairweather (19.45, 8.25) approx.
MF-436, loc. 69 58°27'N, 136°23'W approx.

Placer gold has been recovered from glacially derived gravels. Amount re-
covered not known, but undoubtedly very small. See also Valley of Tears.

(Fourth of July Mtn.) Copper, Silver

Juneau district Mt. Fairweather (16.3, 11.5)
58°39'N, 136°44'W

Traces of chalcopyrite in samples of gossan; country rock sericitized and
chloritized dioritic rock. Samples contained as much as 2 ppm Ag.

(Francis I.) Copper, Gold, Silver, Zinc (?)
MF-436, loc. 47
Juneau district Mt. Fairweather (21.25, 11.35)

58°38'N, 136°1L'wW

Quartz diorite body intruded marble; contact aureole of hornfels and tac-
tite 5 ft wide. Silicified fault zone 10 ft wide along contact between
quartz diorite and tactite contains irregularly distributed chalcopyrite,
bornite, malachite, pyrite, secondary iron minerals, and possibly sphaler-
ite, tetrahedrite, chalcocite, and pyrolusite. Samples contained as much
as 7,000 ppm Cu; 1,000 ppm Zn; 200 ppm Sb; 150 ppm Bi; and 1.46 oz silver
per ton. Old prospect (now covered by landslide debris) reported to have
carried gold and silver values in bornite.

Galena Gold, Lead, Silver, Zinc

Juneau district Mt. Fairweather (15.2, 15.05)
MF-436, loc. 25 58°S1'N, 136°50'W

Vein of banded, vuggy quartz 4-18 in thick was exposed for about 60 ft.
Country rock is granodiorite with subordinate schist and a few lampro-

A5


(Wood Lake) Gold

Juneau district Mt. Fairweather (18.5, 9.65) approx.
MF-436, loc. 70 58°32'N, 136°29'W approx.

Placer gold has been mined from glacially derived gravels.

(Yakobi I.) Copper, Gold

Chichagof district ~ Mt. Fairweather (20.1, 0.45)
MF-436, loc. 64 58°O1'N, 136°20'W

Claims located in about 1887, tunnel driven about 35 ft on quartz vein in
shear zone in mafic intrusive rock; $1,100 in gold (1887 price) reported
to have been mined. Quartz vein above old tunnel contains a little chal-
copyrite and visible gold.

Unnamed occurrence Gold
Chichagof district Mt. Fairweather (19.2, 2.4-2.5
MF-436, loc. 71 58°07'N, 136°26'W

A little gold in beach gravel at mouth of a small stream.

Unnamed occurrence Gold, Silver
Juneau district Mt. Fairweather (17.4, 6.95)
MF-436, loc. 56 58°23'N, 136°37'W

Sample of quartz vein with gouge zone contained 5 ppm Ag and 0.275 oz
gold per ton. Remains of old mining equipment and building.

Unnamed occurrence Gold, Tungsten(?)
Juneau district Mt. Fairweather (15.6, 15.1) approx.
MF-436, loc. 27 58°S51'N, 136°47'W approx.

Gold-bearing vein in shattered metasedimentary rock, Reported to contain
a little scheelite.

Unnamed occurrence Iron, Titanium

Yakutat district Mt. Fairweather (11.25, 10.75)
58°36'N, 137°16'W

Part of gabbro in contact zone between layered gabbro of Crillon-La Perouse
stock and schist probably contains 10%-25% ilmenite.

Unnamed occurrence Nickel
Yakutat district Mt. Fairweather (13.3, 8.75)
58°30'N, 137°03'W

Lenses of disseminated nickel-bearing pyrrhotite as much as 10 £t wide and
500 ft long in diorite; exposed in sheer cliff at head of glacier.
Als


LeRoy Cadmium, Copper, Gold, Lead, Silver,

Zinc
Juneau district Mt. Fairweather (14.7, 15.55)
MR-436, loc. 17 58°53'N, 136°53'W

Veins and veinlets of quartz with minor amounts of feldspars, calcite,
and clay minerals, gold and silver, and the sulfides arsenopyrite, py-
rite, galena, sphalerite, and chalcopyrite transect steeply dipping meta-
morphic rocks that form a screen between granitic bodies; altered zones
along veins also carry a little gold. Samples contained as much as 10.34
oz gold and 7.40 oz silver per ton; 1,000 ppm Cd; 70 ppm Cu; 1,500 ppm
Pb; and 15,000 ppm Zn. Mine developed by 4 adits on LeRoy vein (as much
as 3 ft thick); most of ore mined out from stopes above and below main
adit level. Total production about $100,000 (2,857 fine oz) in gold.
Deposit discovered 1938 and mined until 1945 or later.

(Lituya Bay) Copper, Gold, Iron, Molybdenum, Plati-
num, Titanium, Tungsten

Yakutat district Mt. Fairweather (5.2-9.85, 9.25-13.85)

MF-436, locs. 1, 2, 65, 66 58°31'-58°47'N, 137°26'-137°56'W

Beach placers discovered and mined by Russians before 1867. Americans be-
gan mining in about 1890. Total production through 1917 was worth about
$75,000 (3,625 fine oz) in gold, plus a little platinum. Mining continued
until as recently as 1940, but production was small. Proximate source of
gold, platinum, and other heavy minerals is glacial deposits that are
eroded by storms; deposits are thin and patchy on modern and old raised
beaches; all mining small scale. Ultimate source of heavy minerals is
layered mafic and ultramafic plutons in Fairweather Range. Beach deposits
contain as much as 16.5 1b iron and 90.1 1b TiO, per cubic yard of mater-
ial in place; in magnetite and ilmenite. Gabbro dike exposed on shore of
SE arm of bay contains irregular veinlets and blebs of pyrrhotite and chal-
copyrite. Altered zones SE of bay carry a little gold (one assay showed
0.24 oz per ton) and traces of powellite; a little gold in a stream drain-
ing an altered zone. Includes reference to: (Coal Cr.), (Crillon Inlet,
west side), (Fall Cr.). See also (Pacific beach sands).

Marvitz Gold, Lead
Chichagof district Mt. Fairweather (19.2, 2.35)
MF-436, loc. 63 58°07'N, 136°25'W

Quartz veins that appear to be lenticular and as much as 5 ft thick and
andesite dikes occupy closely spaced joints in quartz-sericite schist and
slate. Veins carry free gold, pyrite, arsenopyrite, and galena. In late
1920's or early 1930's the prospect was developed by 3 tunnels, the long-
est about 210 ft long. No record of any production.

Ag


UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY

SUMMARIES OF DATA ON AND LISTS OF REFERENCES TO
METALLIC AND SELECTED NONMETALLIC MINERAL OCCURRENCES
IN THE MOUNT FAIRWEATHER QUADRANGLE, ALASKA,

SUPPLEMENT TO OPEN-FILE REPORT 78-316

PART A —- SUMMARIES OF DATA TO JANUARY 1, 1980

By
Edward H. Cobb

Open-file Report 81-249A

1981

This report is preliminary and has
not been reviewed for conformity
with U.S. Geological Survey editorial
standards.


0.04 oz gold and 7.07 oz silver a ton
investigations; only traces of silver
estimates (Brew and others, 1978) are
material at a grade of 0.04%-0.06% Mo
mining) and an additional 9.1 million

were not duplicated in most recent
were found. Most recent resource
145 million tons of indicated

and 0.02% Cu (accessible to surface
tons of inferred material at a

grade of 0.06% Mo and 0.02% Cu below sea level near coastline. Material
accessible to surface mining contains potentially richer material that
would have to be mined underground if mined by itself. Chalcopyrite,
minor tetrahedrite, bornite, and enargite outside of molybdenum area dis-
seminated in epidote skarn and in shear zones in skarn; estimated to
average 0.1%-0.2% Cu.
(Orange Point) Copper, Gold, Silver, Zinc
Mt. Fairweather (13.6, 16.35)
58°55'N, 137°00'W

Juneau district
MF-436, loc. 11

Volcanogenic sulfide deposits in Permian(?) meta-andesite in series of
metavolcanic and metasedimentary rocks partially assimilated by Creta-
ceous diorite. Sulfides (pyrite, pyrrhotite, sphalerite, and chalcopyrite;
gold and silver values) grade from disseminations in andesite to massive
bodies, one of which has an average thickness of 65 ft and is exposed

over a strike length of 400 ft and a vertical distance of 100 ft. Analy-
ses of samples showed more than 0.5% Ba in many and, in some, as much as
1,600 ppm Pb, 100 ppm Mo, 500 ppm Sr, 150 ppm V, 150 ppm Co, and (in a

few) 500 ppm Cd; no As, Sb, Bi, Sn, or W. Identified resource estimated
at 270,000 tons containing 2,7% Cu, 5.2% Zn, and 0.03 oz Au and 1 oz Ag
per ton; and 530,000 tons containing 0.4% Cu, 0.3% Zn, and 0.006 oz Au

and 0.35 oz Ag per ton. See also (Johns Hopkins Inlet).

Oregon King Consolidated Gold

Mt. Fairweather (10.2, 9.0)
58°30'N, 137°23'W

Yakutat district
MF-436, loc. 67

36 placer claims on beach and probably stream and terrace deposits. See
also (Pacific beach sands).
(Pacific beach sands) Gold, Iron, Platinum, Titanium

Mt. Fairweather (5.05-14.7, 6.95-15.5)
58°23'-58°53'N, 136°54'-137°57'W

Yakutat district
MF-436, locs. 65-67 (in part)

Data [in Brew and others, 1978 (OF-494)] are generally similar to those
summarized under (Lituya Bay) in Cobb, 1978 (OF 78-316, p. 32), but the
area is extended about 20 mi southeastward to Boussolg Bay and 6 ni north-
ward to Sea Otter Cr. Detailed investigation of 1 mi” of the 8 mi” of
beach sands resulted in estimating 6,000,000 yd of matepial containing
120,000 tons of ilmenite and 1,200 oz of gold in the 1 m” area. See also
(Lituya Bay).


(Mt. Parker) Gold

Juneau district Mt. Fairweather (14.7, 15.4) approx.
58°52'N, 136°53'W approx.

Sample of fairly prominent vein contained 0.94 oz gold per ton. Loca-
tion uncertain; coordinates given above may be in error by as much as 1.5
mi.

(North Crillon Glacier) Chromite, Copper, Iron, Platinum,
Titanium

Yakutat district Mt. Fairweather (9.7-11.25, 11.3-12.25)

MF-436, locs. 4-6 (in part) 58°38'-58°42'N, 137°16'-137°26'W

Layered mafic pluton. One layer about 5 ft thick and extending for several
thousand feet along south wall of valley contains as much as 60% ilmenite
and 2%-3% pyrrhotite and chalcopyrite. Fragments of schist and quartz-
garnet veins in moraine on glacier are copper stained. Float chromite
reported; none found in place. An accessible shear zone contains pyrrho-
tite, chalcopyrite, and ilmenite; chip samples contained as much as 980
ppm Cu, 3,000 ppm Ni, 0.70 ppm Pt. Mineralized zones are similar to those
exposed in north wall of South Crillon Glacier. Amphibolite schist copper
stained near contact with layered intrusive near head of glacier.

(North Marble I.) Copper, Iron, Zinc
Juneau district Mt. Fairweather (22.25, 12.15)
MF-436, loc. 50 58°40'N, 136°04'W

Marble cut by a few mafic dikes. Sulfides in bodies as much as 1-1/2 ft
thick and 15 ft long in marble near and along dikes and in many joints in
dikes. Sulfides identified are pyrite, pyrrhotite, chalcopyrite, covel-
lite, and sphalerite; magnetite also present.

(Nunatak) Copper, Gold, Molybdenum, Silver
Juneau district Mt. Fairweather (21.7, 17.7)
MF-436, loc. 43 58°59'N, 136°06'W

Stockwork of quartz veins, mainly in hornfels around a quartz monzonite
porphyry stock intruded into tightly folded metasedimentary rocks, but also
in the quartz monzonite porphyry and in a silicified zone near the edge of
the stock. Molybdenite in stockwork, in a mineralized fault zone, and dis-
seminated in hornfels. Pyrite, pyrrhotite, chalcopyrite, and traces of
silver associated with molybdenite in parts of the deposit. Resource
estimates are (MacKevett and others, 1971): in stockwork above sea level
near Muir Inlet--2,247,000 tons averaging 0.067% MoS, and 0.016% Cu; re-
mainder of stockwork and fault-zone deposit--129,530,250 tons averaging
0.026% MoS, and 0.018% Cu; additional 18,000,000 tons averaging 0.026%

MoS, and 0.018% Cu under steep cliffs at south end of stockworks; similar
tonnage of similar-grade material below sea level. Samples that contained

ALO


Quartz lenses in fault zone along which granodiorite wall rock is hydrotherm-
ally altered contain minor amounts of sulfides (chiefly arsenopyrite) and spor-
adically distributed gold. About 200 ft of underground workings; all produc-
tion (probably small) was from trench along outcrop of fault zone and consis-
ted of weathered lode material. Altered granodiorite also contains trace of
sulfides and gold.

Iron Mountain Iron
Juneau district Mt. Fairweather (20.75, 7.1) approx.

58°23'N, 136°15' approx.

Magnetite in pods as much as 30 ft wide in a string 500 ft long; replaces
limestone near contact with igneous rock. No sulfides with the magnetite.
See also (Dundas Bay).

(Johns Hopkins Inlet) Copper, Gold, Molybdenum, Silver
Juneau district Mt. Fairweather (12.95-13.7, 15.5-16.3)
MF-436, locs. lo, 11, 14, 15 58°52'-58°SS'N, 137°00-137°04"W

Altered zones in metamorphic and granitic rocks, generally near intrusive con-
tacts, contain very small amounts of chalcopyrite or bornite and some coatings
of secondary copper minerals. Float samples collected by U.S. Bureau of Mines
also contained molybdenite and as much as 0.2 ppm Au and 7 ppm Ag; 3 samples
contained some Sn and one some W. Includes references to (Kashoto Glacier).
See also (Orange Point).

(Johns Hopkins Inlet, entrance) Copper (?), Gold, Lead(?), Silver, Zinc (?)

Juneau district Mt. Fairweather (14.25, 16.35)
58°55'N, 136°56'W

Massive sulfides in carbonate-quartz vein as much as 3.5 ft wide in gneiss.
Sulfides probably include chalcopyrite, sphalerite, and galena. Chip sample
across vein contained 0.03 ppm Au, 15 ppm Ag, 770 ppm Cu, 250 ppm Pb, and
4,300 ppm Zn.

(Lamplugh Glacier) Copper
Juneau district Mt. Fairweather (14.4, 14.4)
MR-436, loc. 28 58°49'N, 136°55'W

Copper stain on wallrock adjacent to pyrite-bearing quartz veins in hornfels.
Samples only slightly anomalous in Cu and Mo.

(Lemesurier I.) Asbestos [paligorskite], Copper, Molybdenum
Chichagof district Mt. Fairweather (22.2-22.45, 4.9-5.35)
MF-436, locs. 61, 62 58°15'-58°17'N, 136°04'-136°06'W

On south tip of island garnet-pyroxene hornfels at contact between marble and
quartz diorite contains molybdenite along small gash veins and disseminated
in contact rock. Molybdenite generally sparse, but forms several percent of
rock in small pockets. Deposit also contains chalcopyrite and graphite. De-
posit was opened by a 78-foot tunnel and a 25-foot crosscut; no record of pro-
duction. At SW headland of Willoughby Cove small veins in limestone contain
quartz, garnet, epidote, molybdenite, chalcopyrite, and bornite. Paligor-
skite was formed in or on top of beds near the top of a Silurian limestone
formation; it has been found on limestone beneath soil cover, in a solution
cavity, and in near-surface fractures cut by calcite veinlets. Most of mater-
ial in 2 deposits has been removed.

AT


(Blue Mouse Cove) Gold, Silver, Zinc

Juneau district Mt. Fairweather (18.2, 14.2)
MF-436, loc. 37 58°48'N, 136°30'W

Quartz vein in shear zone in granitic rocks contains tetrahedrite, pyrite,
and gold. Sample, possibly not from same spot, contained an unidentified
zine mineral and a trace of silver.

(Brady Glacier) Cobalt, Copper, Nickel, Platinum
Juneau district Mt. Fairweather (14.4, 9.85) (in part)
MF-436, loc. 8 (in part) 58°33'N, 136°56'W (in part)

Deposit near east edge and probably fairly near base of a large mafic and
ultramafic layered pluton that elsewhere is exposed over a vertical range
of about 32,000 ft. Deposit exposed in small nunataks and partially ex-
plored (largely by drilling through the ice) by 46 diamond-drill holes.

Ore minerals (listed in order of abundance) are pyrrhotite, pentlandite,
and chalcopyrite, which occur as small massive sulfide bodies and scattered
through all rock types except a few aplite dikes. In the nunataks the
average grades are probably less than 0.5% each of nickel and copper; sul-
fide masses run 2%-3% nickel, 1%-1.21% copper, and 0.25% cobalt. Identi-
fied resource as of 1973 was listed as 20,000,000 tons containing 0.25%
nickel. Analyses of 17 samples for platinum-group metals showed average
contents of 1.29 ppm for massive sulfides, 0.18 ppm for gabbroic rocks
with disseminated sulfides, and 0.23 ppm for ultramafic rocks with dissemi-
nated sulfides. Radar measurements of ice thicknesses suggest that deposit
may have been removed a short distance north of nunataks. On the basis of
additional drilling reported in 1978, resources are estimated at 80 million
metric tons (90 million tons) each of indicated and inferred identified
resources with an estimated average grade of 0.53% Ni and 0.33% Cu.

(Brady Glacier, near snout) Copper, Gold, Molybdenum
Juneau district Mt. Fairweather (17.4, 6.9)
MF-436, loc. 54 (in part) 58°23'N, 136°37'W

Float specimens of molybdenite-bearing quartz have been found on glacier.
§mall gold-bearing quartz veins in mafic gneiss and diorite reported; veins
are only a few inches thick and are exposed for only short distances along
strike. Quartz fragments in stream-sediment sample contained finely dis-
seminated pyrite and chalcopyrite. See also (Taylor Bay).

(Bruce Hills) Copper, Lead, Molybdenum, Silver, Zinc
Juneau district Mt. Fairweather (19.45, 17.6)
MF-436, loc. 41 58°59'N, 136°21'W

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rock; wire silver, tetrahedrite, and copper (potential byproduct) reported.
Near mouth of inlet are scattered sulfides in bleached marble; principal
sulfide is pyrite; sample contained 1,500 ppm Cu; 1,000 ppm Ni; and 700
ppm Co. In peninsula west of inlet are magnetite-rich pods of skarn or tac-
tite in quartz diorite and near contact between it and marble; deposits ap-
pear to be small, but much of nearby bedrock is covered by surficial depos-
its. “Thin quartz veins and thin quartz-rich pegmatite dikes-in granitic rocks
west of inlet contain scattered molybdenite, chalcopyrite, pyrite, and pyrrho-
i

Richtmeyer Gold(?)

Juneau district Mt. Fairweather (14.15, 15.7)
58°53'N, 136°56'W

Gold claim. No specific data; probably on quartz veins in granitic

rock near contact with hornfels. Could not be found during recent in-

vestigation.

(Russell I.) Gold, Silver, Tungsten

Juneau district Mt. Fairweather (15.3, 16.7)
MF-436, loc. 29 58°56'N, 136°49'W

Narrow (no more than 0.5 ft wide) quartz veins in 4-ft-wide iron-stained
altered zone in granodiorite contain pyrite, pyrrhotite, and traces of
scheelite. Highest assay of samples collected by U.S. Bureau of Mines
was 5.81 oz gold and 2.64 oz silver per ton; most assays were much lower.

Sentinel Gold, Lead
Juneau district Mt. Fairweather (15.1, 15.5)
MF-436, loc. 21 58°52'N, 136°50'W

Hydrothermally altered zone about a foot thick in granodiorite sparsely
impregnated by galena and other sulfides; abundant secondary iron miner-
als. An unknown, but undoubtedly small, amount of gold was recovered
from shallow surficial workings.

(Shag Cove) Copper
Juneau district Mt. Fairweather (19.7, 11.55)
MF-436, loc. 46 58°39'N, 130°21'W

Pyrrhotite, pyrite, chalcopyrite, azurite, and cuprite(?) in small
sulfide-rich pods in sheared and altered zone in quartzose rocks. Sample
contained 3,000 ppm Cu, 700 ppm Zn, 200 ppm Co, and a trace of Ag. Prob-
ably are not minable quantities of ore.

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Veins and lenses of sulfide minerals contain chalcopyrite and secondary
copper minerals. Sample from one lens contained 1,000 ppm Cu, 300 ppm Zn,
and a trace of Ag.

(Taylor Bay) Gold
Juneau district Mt. Fairweather (17.0-17.5, 6.2-6.6)
MF-436, loc. 68 (in part) 58°20'-58°22'N, 136°36'-136°39'W

Very fine gold in outwash was mined for a short time in early 1900's. In-
cludes references to (Brady Glacier outwash) .

(Threesome Mtn.) Molybdenum, Silver, Tungsten

Juneau district Mt. Fairweather (17.75, 9.5)
58°32'N, 136°34'W

Fracture coatings and fracture fillings no more than 0.2 ft (average about
0.08 ft) thick made up of quartz, molybdenite, and scheelite in Tertiary
granodiorite stock. Samples contained more than 2,000 ppm Mo and as much
as 7 ppm Ag, 330 ppm Cu, and 4,917 ppm W. Was a little exploratory drill-
ing; claims inactive in 1977.

(3,850 nanatak) Copper, Silver

Juneau district Mt. Fairweather (13.65, 16.9)
58°57'N, 137°00'W

Sulfides in small pods in contact-metamorphosed limestone and/or volcanic
rocks near contact with granitic body are pyrite, pyrrhotite, and some
chalcopyrite. Chip samples contained as much as 1.5 ppm Ag.

(Tidal Inlet) Copper
Juneau district Mt. Fairweather (19.6, 14.2)
MF-436, loc. 42 58°48'N, 136°21'W

Sample of sulfide-bearing quartz veins in marble near contact with diorite
carried 1,000 ppm Cu, 200 ppm Ni, and 300 ppm Co. Sulfides are pyrite,
chalcopyrite, and pyrrhotite(?).

(Torch Bay) Copper

Yakutat district Mt. Fairweather (15.45, 5.6)
58°19'N, 136°50'W

2
50-ft’ area of seacliff of graywacke and schist is malachite and azurite
stained.


(Abyss Lake) Copper, Iron, Silver

Juneau district Mt. Fairweather (17.3, 7.9)
MF-436, loc. 53 58°26'N, 136°37'W

Magnetite-garnet lenses (as large as 30 ft long and 10 ft, thick) with mi-
nor chalcopyrite and pyrite between marble and granite. Sample from one
lens contained 1.5 ppm Ag. Bodies exposed too small to be exploitable.

(Adams Inlet) Molybdenum

Juneau district Mt. Fairweather (22.25, 15.4)
MF-436, loc. 45 58°51'N, 136°03'W

Molybdenite reported to occur on fracture surfaces in metamorphic rocks;
granitic rocks nearby; deposit probably contact metamorphic in origin.

Alaska Chief Copper, Gold, Silver, Zinc(?)
Juneau district Mt. Fairweather (21.85, 8.2)
MF-436, loc. 59 58°27'N, 136°07'W

Massive sulfides (chalcopyrite, pyrite, pyrrhotite, and probably sphaler-
ite) replaced tactite, hornfels, and marble in contact zone of a granitic
mass; some surface oxidation; gangue mainly calcite with smaller amounts
of quartz. Prospect consists of stripped area about 150 ft by 55 ft and

a 40-ft adit; work probably done in early 1900's. Chip samples of stripped -

area contained as much as 15,000 ppm Cu, 700 ppm Zn, 300 ppm Co, 8 ppm Au
(0.232 oz per ton), and 150 ppm Ag (4.377 oz per ton). Indicated resource
estimated at 27,000 tons containing 1% Cu, 0.1 oz Au, and 2 oz Ag per

ton. Lateral extent of deposit and grade at depth not known.

Alaska Independence Mining Co. Gold(?)

Juneau district Mt. Fairweather
N 1/2 SE 1/4 quad.

Prospecting, 1932-33. No other data available. Probably was a gold
prospect.

(Astrolabe Peninsula) Iron, Titanium
Yakutat district Mt. Fairweather (14.75, 6.55)
MF-436, loc. 9 58°22'N, 136°54'W

Layered gabbro stock makes up mountain on peninsula. Float samples from
a zone about 900 ft thick that appears to extend through the mountain
contained 8%-22% magnetite and 2% ilmenite.

A2


Introduction

This report was prepared as a supplement to a 1978 report, part of
which summarized data on mineral occurrences in the Mount Fairweather quad-
rangle, Alaska (Cobb, E. H., 1978, Summary of references to mineral occur-
rences (other than mineral fuels and construction materials) in the Mt.
Fairweather and Skagway quadrangles, Alaska: U.S. Geological Survey Open-
File Report 78-316, 128 p.). As a result of suggestions from users of the
series of which the 1978 report is a part, this supplement is released in
two parts; Part A, which presents summaries of data to January 1, 1980,
and Part B, which consists of reference lists for each occurrence.

In Part A data from reports released between the cut-off date (Novem-
ber 1, 1977) for the original report and January 1, 1980 have been incor-
porated in rewritten or new summaries where appropriate; if there are no
new data on a deposit the original summary is repeated. For each deposit
the name, list of mineral commodities, and location data are in the same
format as is the 1978 report. Also included is an updated list of syno-
nyms, owner, operator, and claim names.

In Part B citations are in standard bibliographic format with the
exception that references to reports and maps in numbered publication
series also show, in parentheses, an abbreviation for the report or map
series and the number of the report or map. Abbreviations used are:

AOF Alaska Division of Geological and Geophysical Surveys
Open-File Report

B U.S. Geological Survey Bulletin

c U.S. Geological Survey Circular

Ic U.S. Bureau of Mines Information Circular

OF U.S. Geological Survey Open-File Report

MF U.S. Geological Survey Miscellaneous Field Studies Map
P U.S. Geological Survey Professional Paper

RI U.S. Bureau of Mines Report of Investigations

Citations to the principal references used in preparing the summaries
in Part A are preceded by an asterisk.

Because the form of citation used in the reference list for each
deposit constitutes sufficient identification of each numbered report or
map to allow it to be found easily in most libraries, the general refer-
ence list in this report consists only of reports without formal identify-
ing numbers. Numbers given to Geological Survey Open-File Reports listed
with complete titles are informal and are used mainly in the Branch of
Alaskan Geology of the Geological Survey.

Al


(Palma R.) Copper

Yakutat district Mt. Fairweather (13.65, 7.35)
58°25'N, 137°O1'W

Malachite and azurite stain on cliff face in amphibolite schist.

Parker, A. F. Gold, Lead, Silver

Juneau district Mt. Fairweather (14.5, 15.7)
MF-436, loc. 16 58°53'N, 136°54'W

Quartz veinlets 1/2 to 1 in thick in 10 in of gouge in a fault zone in
granodiorite contain galena, pyrite, and free gold. Developed between
1938 and 1941 by a 20-ft tunnel. 7 or 8 tons of ore mined. Six U.S.
Bureau of Mines grab and short channel samples contained as much as 5.13
oz gold and 1.55 oz silver per ton; values spotty.

(Ptarmigan Cr.) Zinc

Juneau district Mt. Fairweather (14.75, 15.35)
MF-436, loc. 18 58°52'N, 136°52'W

Discontinuous lenticular quartz vein in fault zone contains sphalerite.
Fault can be traced for 4,500 ft; wall rock altered. Much of creek staked
in placer claims; no workable placers found.

(Queen Inlet) Copper, Iron
Juneau district Mt. Fairweather (18.0, 16.0)
MF-436, loc. 39 58°54'N, 136°31'W

Small tactite bodies along contacts between alaskite (with associated
porphyritic volcanic rocks) and marble locally contain enough magnetite
to be called skarn. Skarn and mafic dikes that cut alaskite and marble
contain veins and pods of sulfides (mainly pyrite, but some chalcopyrite
and secondary copper minerals). Spectrographic analyses indicated that
samples contained as much as 300 ppm Cu, 300 ppm Co, and 30 ppm Sn.
Magnetometer traverse suggested more magnetite-bearing bodies under gla-
cial drift. Known bodies too small and too lean to warrant economic
interest.

Rainbow Gold, Lead, Silver, Zinc

Juneau district Mt. Fairweather (15.0, 15.65)
MF-436, loc. 20 58°53'N, 136°51'W

Steeply dipping altered zone in granodiorite and alaskite extends about
1/2 mi SW from sea level and contains quartz-calcite veins. Ore mined
from brecciated vein material that contains gold and a mineral assemblage
similar to that at LeRoy mine; 180 ft adit (portal 15 ft above sea level),

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(South Crillon Glacier) Chromite, Cobalt, Copper, Gold, Iron,
Nickel, Titanium

Yakutat district Mt. Fairweather (10.8, 11.25)
MF-436, loc. 3 58°38'N, 137°19'W

Iron-stained shear zones in layered gabbro near basal contact with amphi-
bolite schist as much as 20 ft thick and thousands of feet long; most are
inaccessible. One small (6-8 ft thick) zone contained a small pod of
sulfides (pyrrhotite, chalcopyrite, and pentlandite) ; sample contained
3,000 ppm Cu, 2,500 ppm Ni, and 700 ppm Co. Sample across rest of zone,
which carries disseminated sulfides, carried smaller amounts of these
elements and as much as 0.10 ppm Au. Intrusive contains ilmenite-rich
zones. Chromite has been found in float on the glacier, but not in place.

(South Marble I.) Copper (?)
Juneau district Mt. Fairweather (22.45, 11.65)
MF-436, loc. 51 58°39'N, 136°03'W

Sulfide mineralization reported to be similar to that on North Marble I.,
where pyrite, pyrrhotite, chalcopyrite, and covellite are in marble near
dikes and in joints in dikes. Recent investigation reported only pyrite
in silicified marble and mafic dikes on South Marble I. Samples contained
as much as 100 ppm Ni, 200 ppm Cu, and 1% Ti.

Sunrise Copper, Gold, Silver, Tungsten(?)
Juneau district Mt. Fairweather (15.45, 15.25)
MF-436, loc. 26 58°S1'N, 136°48'W

Altered zones in marble and hornfels cut by Lamprophyre dikes contain small
pods of sulfides, mainly chalcopyrite and pyrrhotite. Small quartz vein
about parallel to bedding contains small amounts of gold and silver and
some pyrite. Also a report of scheelite being found nearby. See also un+
named occurrence at 58°23'N, 136°37'W (group of claims with same name).

(Surge Bay) . Copper(?), Nickel(?)

Chichagof district Mt. Fairweather (18.25, 0.5) approx.
58°OL'N, 136°21'W approx.

Area of gabbroic rocks. Claim located in 1923, presumably for nickel and
copper.

(Tarr Inlet) Copper

Juneau district Mt. Fairweather (13.55-14.2,
16.9-17.3)

MF-436, locs. 12, 13 58°58'-58°S9'N, 136°56'-137°00'W

Al5