Grub Gulch

The Grub Gulch is a gold mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Grub Gulch

Commodity

Primary: Gold

Location

State: Alaska
District: Nome

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Placer Au-PGE

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Gold
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Alluvial placer Au (Cox and Singer, 1986; model 39a).

Comment (Workings): Workings / Exploration = This placer deposit was worked by hand or horse-drawn scrapers mainly between 1903 and 1906. The pay averaged about 0.18 ounce of gold per cubic yard.

Comment (Geology): Age = Quaternary.

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = The lower half-mile or so of Grub Gulch, at surface elevations less than 300 feet, was placer mined by hand or horse-drawn scrapers and apparently worked out before 1905 (Collier and others, 1908; Moffit, 1913). The pay streak was 40 feet wide and 5 to 6 feet thick in gravels containing schist, vein quartz, and some granite boulders. Recovered gold was coarse, rough, and reported to run 3.75 dollars (about 0.18 ounce) per cubic yard (Moffit, 1913). Grub Gulch crosses graphitic quartz schists, calcareous mica schist, and a 150-foot-thick, east-dipping, highly competent granitic orthogneiss (C.C. Hawley, written communication for Kennecott Exploration Company, 1995). The placer mainly overlies mica schist bedrock that probably has an early Paleozoic protolith age (Hummel, 1962 [MF 247]; Sainsbury, Hummel, and Hudson, 1972 [OFR 72-326]; Till and Dumoulin, 1994; Bundtzen and others, 1994). The granitic boulders in Grub Gulch probably are derived from the orthogneiss upstream. In other nearby creeks that partly traverse orthogneiss (for example, Seattle Creek, NM200), quartz boulders are abundant along and immediately downstream from, orthogneiss bedrock sections of the creek, suggesting that some of the gold may have been derived from quartz veins at the contacts of the orthogneiss.

Comment (Reference): Primary Reference = This report

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Nome quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-463, 2 sheets, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Nome quadrangle, Alaska: U.S. Geological Survey Open-File report 78-93, 213 p.

Reference (Deposit): Bundtzen, T.K., Reger, R.D., Laird, G.M., Pinney, D.S., Clautice, K.H., Liss, S.A., and Cruse, G.R., 1994, Progress report on the geology and mineral resources of the Nome mining district: Alaska Division of Geological and Geophysical Surveys, Public Data-File 94-39, 21 p., 2 sheets, scale 1:63,360.

Reference (Deposit): Till, A.B., and Dumoulin, J.A, 1994, Geology of Seward Peninsula and St. Lawrence Island, in Plafker, G., and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, The Geology of North America, DNAG, v. G-1, p. 141-152.

Reference (Deposit): Collier, A. J., Hess, F.L., Smith, P.S., and Brooks, A.H., 1908, The gold placers of parts of Seward Peninsula, Alaska, including the Nome, Council, Kougarok, Port Clarence, and Goodhope precincts: U.S. Geological Survey Bulletin 328, 343 p.

Reference (Deposit): Sainsbury, C.L., Hummel, C.L., and Hudson, Travis, 1972, Reconnaissance geologic map of the Nome quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 72-326, 28 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Moffit, F.H., 1913, Geology of the Nome and Grand Central quadrangles, Alaska: U.S. Geological Survey Bulletin 533, 140 p.

Reference (Deposit): Hummel, C.L., 1962, Preliminary geologic map of the Nome C-1 quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-247, 1 sheet, scale 1:63,360.

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