Upper Ruby Creek (ARDF #MD068) Ag, Au

Upper Ruby Creek

Mine, Inactive

Commodities and mineralogy

Main commodities	Ag; Au
Other commodities	Bi; Th; W
Ore minerals	bismuth; brookite; gold; scheelite
Gangue minerals	ilmenite; magnetite

Geographic location

Quadrangle map, 1:250,000-scale	MD
Quadrangle map, 1:63,360-scale	A-4
Latitude	63.233
Longitude	-154.778
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	The Upper Ruby Creek mine is located at an elevation of 1,000 feet (300 m) in Section 13, T. 26 S., R. 22 E., of the Kateel River Meridian. Location is within 300 feet (91 m).

Geologic setting

Geologic description The Upper Ruby Creek placer mine is a continuation of the Ruby Creek-Strand deposit (MD069); the only difference is a higher stream gradient of 250 feet/mile. White and Stevens (1953) studied the abundant radioactive concentrates from Upper Ruby Creek placer deposit. Age of mineralization is unknown, but probably Quaternary, based on local geomorphology.
Geologic map unit	(-154.780324347198, 63.2323922257254)
Mineral deposit model	Placer Au-PGE (Cox and Singer, 1986; model 39c).
Mineral deposit model number	39c

Production and reserves

Workings or exploration	Upper Ruby Creek was mined mostly prior to 1925 (Brown, 1926).
Indication of production	Yes
Production notes	Production data is scant and was lumped with Ruby Creek-Strand and Crystal Gulch deposits, which collectively produced 1,511 ounces (47 kg) of gold from 1920 to 1942.
Additional comments See Ruby Creek-Strand (MD068) and Crystal Gulch (MD070) deposits. The Upper Ruby Creek mine is on lands selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

References

MRDS Number	D002708
References Brown, J.S., 1926, The Nixon Fork country: U.S. Geological Survey Bulletin 783-D, p. 97-144. Cobb, E.H., 1974, Placer Deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 pages. Cobb, E.H., 1978, Summary of references to mineral occurrences in the Beaver, Bettles, and Medfra quadrangles: U.S. Geological Survey Open File Report 78-94, 54 pages. Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, p. 115-245. Smith, P.S, 1926, The mineral industry in Alaska in 1924: U.S. Geological Survey Bulletin 783, 166 pages. White, M.G., and Stevens, J.M., 1953, Reconnaissance for radioactive minerals in the Ruby-Poorman and Nixon Fork districts, west-central Alaska, in 1949: U.S. Geological Survey Circular 279, 19 pages.
Reporters	Bundtzen, T.K. (Pacific Rim Geological Consulting)
Last report date	6/7/1998