Unnamed (Gulf of Alaska coast: Includes Topsy Creek, Dagelet River, and Oregon King Consolidated claims)

Site Name

Primary: Unnamed (Gulf of Alaska coast: Includes Topsy Creek, Dagelet River, and Oregon King Consolidated claims)

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Commodity

Primary: Iron
Primary: Gold
Primary: Titanium
Secondary: PGE
Secondary: Zirconium
Secondary: Chromium

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Location

State: Alaska
District: Yakutat

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Name: Silt
Role: Host
Age Type: Host Rock
Age Young: Holocene

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Analytical Data

Not available

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Materials

Ore: Ilmenite
Ore: Magnetite
Ore: Rutile
Ore: Zircon
Ore: Gold
Gangue: Garnet

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Comments

Comment (Exploration): Status = Probably inactive

Comment (Commodity): Ore Material = Gold (native)

Comment (Commodity): Ore Material = PGE

Comment (Production): Production Notes = Gold production is probably in the thousand-ounce range. Minor amounts of platinum have been recovered.

Comment (Geology): Age = Holocene.

Comment (Commodity): Gangue = other dense common rock minerals

Comment (Deposit): Model Name = Placer: Modern beach, active beach, back beach; marine terrace and possibly fluvial.

Comment (Workings): Workings / Exploration = Surface workings: Sluice box, rockers, long toms on mostly transient deposits. Workings date back to at least 1894 (Mertie, 1933). Probably, small-scale activity continued every year until World War II, as documented in Annual resource reports by Brooks, Smith, Mertie, and a few others.?Government investigations include those by Rossman in 1952 (Rossman, 1957), Thomas and Berryhill (1962), Kimball and others (1978), and Foley and others (1995). Thomas and Berryhill (1962) found relatively good values of titania in the beaches south of Lituya; one sample (no. 123) collected below a northern outlier of LaPerouse Glacier contained 89.5 pounds/cubic yard of titania. ? the most extensive and detailed investigations were conducted from 1975 to 1977 by the U.S. Bureau of Mines (Kimball and others, 1978). In those investigations, sample lines were run about 3 and 3.5 miles south of Harbor Point (lines 13 "&" 14), at Topsy Creek (line 15), two miles south of Topsy Creek (line 16), about 1/2 mile north of the Dagelet River (line 17), and about one mile north of LaPerouse Glacier (line 18).? In the Harbor Point north line (13), as much as 2.8 pounds/cubic yard of ilmenite was recovered in auger or PVC tube from fine to medium sand. Maximum gold was reported as 0.0003 ounce/cubic yard. Ilmenite and gold were much more abundant two miles south of Topsy (line 16). Gold was present there in four tube samples and was reported as 0.0024 ounce/cubic yard in a select grab sample. Ilmenite content was more than 2 pounds/cubic yard in 8 of 10 tube samples and was a maximum of 15.2 percent (495 pounds/cubic yard). The gold-bearing grab sample contained 30.3 percent ilmenite. Ilmenite is also relatively abundant near Dagelet River, with a maximum of 11.5 percent in one tube sample. Gold content there was 0.0043 ounce/cubic yard in a grab sample. Ilmenite content was as much as 1.7 percent in line 18 north of LaPerouse Glacier .? Foley and others (1995) collected 7 samples along the placer, beginning with sample no. 303 near line 14 and continuing through numbers 305-310. Sample 303 had 0.056 gram/tonne gold in the head split. Sample 307 contained 4.37 percent ilmenite in the head split and 10.48 percent ilmenite in the spiral concentrate. Gold was present in several of the samples.

Comment (Geology): Geologic Description = A nearly continuous beach placer is exposed for about 13.5 miles northward from LaPerouse Glacier to the headland south of Harbor Point. Associated fossil beach placers occur on an approximate an 1/2-mile wide plain northeast of the beach placers. The modern beaches were produced by winnowing of deposits brought down by LaPerouse Glacier and the Crillon River. The glacier and river tap the Crillon-LaPerouse and related layered mafic complexes, which are the ultimate source of much of the titanium, iron, and PGEs contained in the placer deposits. Some gold may have been brought down from the hydrothermally altered zones at the head of Topsy Creek reported by Rossman (1959); these zones appear to be the continuation of the auriferous hydrothermal areas in Fall Creek in Lituya Bay (MF043).? Economic deposits of gold are thin, lenticular transient deposits related to storm concentration of the heavy sands. Deposits of ilmenite, magnetite, and small amounts of rutile and zircon occur in substantially thicker deposits, which have been sampled in several studies conducted by the Bureau of Mines and by Rossman (1957) of the Geological Survey. (Related deposits are described in MF040 and MF041.)? Kimball and others (1978, p. C72-73) reported a maximum of 1.9 percent ilmenite and a trace of gold in samples contained on line 15. This location is at the mouth of Topsy Creek. At line 16, which corresponds closely to the mid-point coordinates of the placer deposit , as much as 15.2 percent ilmenite was found in a tube sample, and 30.3 percent ilmenite in a grab sample. Maximum gold content at line 16 in a tube sample was 0.0009 ounce per cubic yard. At the Bureau's line 17 near the mouth of the Dagelet River (p. C74-75) as much as 3 percent ilmenite was found in a channel sample and as much as 11.5 percent in a tube sample. Gold was found in a grab sample (0.0043 ounce of gold per cubic yard). Trace amounts of gold and as much as 1.7 percent ilmenite were found in line 18, one mile northwest of LaPerouse Glacier.

Comment (Deposit): Other Comments = There is a large resource of ilmenite, but probably less than at Yakutat (Foley and others, 1995). Gold and platinum would be recovered from an industrial sand operation. Recovery of very fine gold near Lituya Bay has been studied by Cook (1969). The heavy mineral beach system is part of the Pacific coast province of heavy mineral beaches studied by Clifton and Luepke (1987). ? the beach placer and related upland sites are within Glacier Bay National Park and Preserve. The Park and Preserve extend to three miles offshore.

Comment (Reference): Primary Reference = Kimball and others, 1978

Comment (Reserve-Resource): Reserves = the Bureau of Mines (Kimball and others, 1978) calculated about one million cubic yards of material based on the sampled lines representative of this placer. Block 7 (line 16) has a calculated resource of about 664,000 cubic yards of material containing 4 percent ilmenite and 0.0002 oz/yd gold.

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References

Reference (Deposit): Mertie, J.B., Jr., 1933, Notes on the geography and geology of Lituya Bay: U.S. Geological Survey Bulletin 836-B, p. 117-135

Reference (Deposit): Cook, D.J., 1969, Lituya Bay, in Heavy minerals in Alaskan beach sand deposits: University of Alaska, Mineral Industry Research Laboratory Report 20, p. 47-57.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mt. Fairweather and Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 78-316, 123 p.

Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

Reference (Deposit): Rossman, Darwin, 1963, Geology and petrology of two stocks of layered gabbro in the Fairweather Range, Alaska: U.S. Geological Survey Bulletin 1121-F, p. F1-F50.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

Reference (Deposit): Rossman, Darwin, 1957, Ilmenite-bearing beach sands near Lituya Bay, Alaska: U.S. Geological Survey Open-File Report 149, 10 p.

Reference (Deposit): Thomas, B.I., and Berryhill, R. V., 1962, Reconnaissance studies of Alaskan beach sands, eastern Gulf of Alaska: U.S. Bureau of Mines Report of Investigations 5986, 40 p.

Reference (Deposit): Rossman, Darwin, 1959, Geology and ore deposits in the Reid Inlet area, Glacier Bay, Alaska: U.S. Geological Survey Bulletin 1058-B, p. 33-58.

Reference (Deposit): Clifton, H.E., and Luepke, G., 1987, Heavy-mineral placer deposits of the continental margin of Alaska and the Pacific Coast States, in Geology and resource potential of the continental margin of western North America and adjacent ocean basins, Beaufort Sea to Baja California: Circum-Pacific Council for Energy and Mineral Resources, Earth Science Series, v. 6, p. 691-738.

Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.

Reference (Deposit): Foley, J.Y., La Berge, R.D., Grosz, A.E., Oliver, F.S., and Hirt, W.C., 1995, Onshore titanium and related heavy mineral investigations in the eastern Gulf of Alaska region, southern Alaska: U.S. Bureau of Mines Open-File Report 10-95, 125 p.

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