Malemute Gulch (Pup)

Mine and prospect, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities As; Hg
Ore minerals arsenopyrite; cinnabar; gold (lode); cassiterite; chromite; ferberite; realgar; scheelite (placer)
Gangue minerals allanite; calcite; quartz (lode); zircon (placer)

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale B-4
Latitude 62.45898
Longitude -157.9109
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Malemute Gulch Mine and prospect are on the north side of Otter Creek about 1 mile northeast of Discovery camp. The mouth of the gulch is at an elevation of 400 feet in the SE1/4 section 1, T. 27 N., R. 47 W., of the Seward Meridian. Malemute Gulch or Pup is locality 32 of Cobb (1972 [MF 363]); also described in Cobb (1976 [OFR 76-576]).

Geologic setting

Geologic description

This record includes both a lode and a placer deposit in what is locally called Malemute Gulch. The lode deposit consists of a N15-25E, steeply dipping quartz-calcite-sulfide vein that contains arsenopyrite, cinnabar, and a considerable amount of gold (Mertie, 1936; Bundtzen and others, 1992; Miller, Bundtzen, and Gray, 2005). A 70-foot drift, now caved, explored the deposit. Mertie (1936) first suggested that the Malemute Gulch lode is on the projection of the Golden Horn veins (ID115) exposed about 0.6 mile to the southwest.
A formerly productive, residual placer deposit overlies the lode. The gold fineness in the placer averages 832 (Bundtzen, Cox, and Veach, 1987; Smith, 1941 [B 910]). The placer concentrates contained scheelite, chromite, ferberite, realgar, cinnabar, allanite, zircon, and cassiterite. From 1912 to 1952, the placer produced 1,907 ounces of gold and 241 ounces of silver (Miller, Bundtzen, and Gray, 2005). The placer concentrates contained up to 1.80 percent WO3, 500 parts per million antimony, and 1.76 percent mercury as cinnabar (Maloney, 1962).
Geologic map unit (-157.913301309788, 62.4582957557867)
Mineral deposit model Polymetallic vein or Porphyry Au-Cu for the lode; also a placer gold deposit (Cox and Singer, 1986; models 22c or 20a and 39a).
Mineral deposit model number 22c or 20a and 39a
Age of mineralization The placer deposit is probably Quaternary. The lode deposit may be 63.0 Ma by analogy with the Golden Horn Mine (ID115).

Production and reserves

Workings or exploration A 70-foot drift, now caved, explored the lode deposit. The overlying placer deposit was intermittently mined by open-cut mining methods from 1912 to 1952. It is not clear where the caved adit is in respect to the placer deposit. Mertie (1936) indicated a lode prospect '100 yds' below Malemute Gulch. Maloney (1962) stated that the caved adit was 400 feet west of the gulch. A caved adit that T.K. Bundtzen visited was within the area that was placer mined.
Indication of production Yes
Production notes From 1912 to 1952, the placer produced 1,907 ounces of gold and 241 ounces of silver (Miller, Bundtzen, and Gray, 2005). The placer concentrates contained up to 1.80 percent W03, 500 parts per million antimony, and 1.76 percent mercury as cinnabar (Maloney, 1962).

References

MRDS Number A015053; A015076; D002700

References

Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 242-286.
Bundtzen, T.K., Cox, B.C., and Veach, N.C., 1987, Heavy mineral provenance studies in the Iditarod and Innoko districts, western Alaska: Process Mineralogy VII, The Metallurgical Society, p. 221-246.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/21/2003