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Twin Creek

Past Producer in Alaska, United States with commodity Gold
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Geologic information

Identification information

Deposit ID 10000921
MRDS ID A011589
Record type Site
Current site name Twin Creek
Alternate or previous names Big Boulder Creek, Little Boulder Creek, John Creek, Notobac Creek
Related records 10185898

Geographic coordinates

Geographic coordinates: -151.53279, 62.33952 (WGS84)
Relative position The location given is the center of a placered area which extends for about 3000 feet upstream and about one mile downstream in Sections 16, and 21, T. 26 N., R. 12 W., of the Seward Meridian. John, Big Boulder, and Little Boulder Creeks are headwater tributaries to Twin Creek. Clark and Cobb (1972) show this property as locality 17 on MF-369. It is also shown by Reed and others (1978) as locality 68 and by MacKevett and Holloway (1977) as locality 13.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Gold Ore
Platinum Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
BC deposit profile C01. C02
Deposit model name Placer Au-PGE
Mark3 model number 54

Nearby scientific data

(1) -151.53279, 62.33952
ListMap

Comments on the geologic information

  • 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).
  • Age = Pleistocene and possibly Tertiary.

Economic information

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Undetermined.

Mining district

District name Yentna

Comments on the production information

  • 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.

Comments on the reserve resource information

  • 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.

Comments on the workings information

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

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011589
USGS Alaska Resource Data File ARDF TL026

Bibliographic references

  • 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.

  • Deposit

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

  • Deposit

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

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • Deposit

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

  • 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.

Comments on the references

  • Primary Reference = C.C. Hawley and Associates, Inc., 1978

General comments

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

Reporter information

Type Date Name Affiliation Comment
Reporter 10-AUG-1998 Madelyn A. Millholland Millholland & Associates