Twin Creek

Site Name

Primary: Twin Creek
Secondary: Big Boulder Creek
Secondary: Little Boulder Creek
Secondary: John Creek
Secondary: Notobac Creek

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Commodity

Primary: Gold

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Location

State: Alaska
District: Yentna

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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

Model Name: Placer Au-PGE

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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

Not available

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Analytical Data

Not available

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Materials

Ore: Gold
Ore: Platinum

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Comments

Comment (Deposit): Other Comments = Some data for Twin and Mills (TL059) Creeks are combined in the literature. Cobb and Reed (1980) indicate that Notobac Creek is probably another name for Twin Creeks or for a tributary to Twin Creek and that John(s) Creek is a small, steep-sided gulch tributary to Twin Creek that is cut in the Tertiary Kenai Group sediments. Capps (1913) reports that Johns Creek saw small production for a few years during the first quarter of the 20th century.

Comment (Reference): Primary Reference = C.C. Hawley and Associates, Inc., 1978

Comment (Reserve-Resource): Reserves = C.C.Hawley and Associates, Inc. (1978) show possible reserve of 752,000 cubic yards on Figure 4.2-B(4); probable reserves are largely covered by old tailings.

Comment (Workings): Workings / Exploration = Mined in a drag line washing plant and sluice box (C.C.Hawley and Associates, Inc., 1978).

Comment (Geology): Geologic Description = The Twin Creek area is a major contributor to the gold production in the Yentna district. A productive placer area covers approximately 36 square miles, including streams draining Fairview Mountain, with the main area of interest generally northeast and southeast of the summit of Fairview Mountain. No lode occurrences have been found in the placer deposits near Fairview Mountain/Collinsville (Hawley and Clark, 1978). ? C.C. Hawley and Associates, Inc. (1978) describe this placer occurrence as Pleistocene auriferous gravels with the main gold-bearing section lying on a brown to orange-brown clay bed about 15 feet deep, consisting of about 5 feet of quartz-bearing gravel. The gravel is underlain by the continentally derived Tertiary sedimentary rocks of the Kenai Group (Reed and Nelson, 1980).? Twin Creek has been mined nearly the entire distance from the confluence with Mills Creek up into headwater tributaries; probable reserves are largely covered by old tailings. Platinum minerals have been reported from the area (0.78 oz/ton), although the exact location was not specified. Hawley, C.C.and Associates, Inc. (1978) show possible reserve of 752,000 cubic yards on Figure 4.2-B(4).? Some data for Twin and Mills (TL059) Creeks are combined in the literature. Cobb and Reed (1980) indicate that Notobac Creek is probably another name for Twin Creek or for a tributary to Twin Creek and that John Creek is a small, steep-sided gulch tributary to Twin Creek that is cut in the Tertiary Kenai Group sediments. Capps (1913) reports that Johns Creek saw small production for a few years during the first quarter of the 20th century.? Also see Pass Creek (TL024).

Comment (Exploration): Status = Undetermined.

Comment (Geology): Age = Pleistocene and possibly Tertiary.

Comment (Deposit): Model Name = Placer Au-PGE (Cox and Singer, 1986; model 39a).

Comment (Production): Production Notes = One sample of about 10 lb/yard (probably cubic yards) of black sand contained 0.78 oz/ton platinum metals (C.C. Hawley and Associates, Inc., 1978). Capps (1913) reports that Johns Creek saw small production for a few years during the first quarter of the 20th century.

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References

Reference (Deposit): Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p.

Reference (Deposit): Smith, P.S., 1942, Mineral Industry of Alaska in 1940: U. S. Geological Survey Bulletin 933-A, p. 1-102.

Reference (Deposit): Cobb, E.H., and Reed, B.L., 1980, Summaries of data and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.

Reference (Deposit): Capps, S.R., 1924, Geology and mineral resources of the region traversed by the Alaska Railroad: U.S. Geological Survey Bulletin 755-C, p. 73-150.

Reference (Deposit): Smith, P.S., 1942, Mineral industry of Alaska in 1940: U.S. Geological Survey Bulletin 933-A, p. 1-102.

Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-369, 1 sheet, scale 1:250,000.

Reference (Deposit): C.C. Hawley and Associates, Inc., 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U.S. Bureau of Mines Open-File Report 24-78, 275 p., 7 plates.

Reference (Deposit): Reed, B.L., Nelson, S.W., Curtin, G.C., and Singer, D.A., 1978, Mineral resources map of the Talkeetna Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-870-D, 1 sheet, scale 1:250,000.

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