Stream gradient approximately 100 feet per mile.
Location: The Jack placer mine is at an elevation of about 850 feet on a west-flowing tributary to the south fork of Quartz Creek. The map site is in section 11, T. 1 N., R. 13 W., of the Kateel River Meridian, and the coordinates are for the approximate midpoint of the placer ground. Cobb, 1972 (MF-389), location 32.
Geology: Quartz Creek heads in syenite of the Late Cretaceous, Granite Mountain pluton. Bedrock at the Jack placer mine is syenite and Jurassic-Cretaceous andesite. Fragments of narrow quartz veins and pegmatites occur in the placer. Placer gold is concentrated in the stream for approximately 1 mile. Some platinum has been recovered with the gold. Heavy minerals collected from stream gravels over syenite bedrock contained sphene, melanite, magnetite, hornblende, zircon, thorite and uranothorite. Samples collected over andesite bedrock contained hornblende, magnetite, ilmenite, spinel, and hematite (Gault and others, 1953).
Age: Quaternary.

Commodities (Major) - Au; (Minor) - Ag, Pb, Pt, W, Zn
Development Status: Yes; small
Deposit Model: Placer Au-PGE (Cox and Singer, 1986; model 39a).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

ⓘ Native Gold

ⓘ Native Platinum

2 valid minerals.

Detailed Mineral List:

ⓘ Native Gold

Formula: Au

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

ⓘ Native Platinum

Formula: Pt

References:

(2008) Alaska Resource Data File (ARDF) Open-File Report 2008-1225. US Geological Survey

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Gold	1.AA.05	Au
ⓘ	Native Platinum	1.AF.10	Pt

List of minerals for each chemical element

Pt	Platinum
Pt	ⓘ Native Platinum	Pt
Au	Gold
Au	ⓘ Native Gold	Au

Other Databases

Link to USGS - Alaska:	CA023

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America PlateTectonic Plate

Koyukuk-Selawik DomainDomain
Koyukuk ArcsVolcanic Arc

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Anderson, Eskil, 1947, Mineral occurrences other than gold deposits in northwestern Alaska: Alaska Territorial Division of Mines Pamphlet 5-R, 48 p. Cass, J.T., 1959, Reconnaissance geologic map of the Candle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-287, 1 sheet, scale 1:250,000. Cobb, E.H., 1972, Metallic mineral resources map of the Candle Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-389, 1 sheet, scale 1:250,000. Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Candle, Holy Cross, Norton Bay, Nulato, and Unalakleet quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-866, 102 p. Gault, H.R., Killeen, P.L., West, W.S., and others, 1953, Reconnaissance for radioactive deposits in the northeastern part of the Seward Peninsula, Alaska, 1945-47 and 1951: U.S. Geological Survey Circular 250, 31 p. Miller, T.P., and Elliott, R.L., 1969, Metalliferous deposits near Granite Mountain, eastern Seward Peninsula, Alaska: U.S. Geological Survey Circular 614, 19 p. Smith, P.S., 1930, Mineral Industry of Alaska in 1927: U.S. Geological Survey Bulletin 810, p. 1-64. Smith, P.S., 1930, Mineral Industry of Alaska in 1928: U.S. Geological Survey Bulletin 813, p. 1-72. Smith, P.S., 1932, Mineral Industry of Alaska in 1929: U.S. Geological Survey Bulletin 824, p. 1-81. Smith, P.S., 1933, Mineral Industry of Alaska in 1930: U.S. Geological Survey Bulletin 836, p. 1-83. Smith, P.S., 1933, Mineral Industry of Alaska in 1931: U.S. Geological Survey Bulletin 844 A, p. 1-82. Smith, P.S., 1934, Mineral Industry of Alaska in 1932: U.S. Geological Survey Bulletin 857 A, p. 1-91. Smith, P.S., 1934, Mineral Industry of Alaska in 1933: U.S. Geological Survey Bulletin 864 A, p. 1-94. Smith, P.S., 1936, Mineral Industry of A

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