Unnamed (north end of Greenstone Ridge)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu

Geographic location

Quadrangle map, 1:250,000-scale BH
Quadrangle map, 1:63,360-scale B-4
Latitude 60.49
Longitude -160.19
Nearby scientific data Find additional scientific data near this location
Location and accuracy This lode prospect is on the north end of Greenstone Ridge, about 3/4 mile southwest of Golden Gate Falls on the Kisaralik River. It is approximately located, perhaps within 1/2 mile. It is locality 1 of Cobb (1972 [MF 455]) and of Hoare and Cobb (1977).

Geologic setting

Geologic description

Hoare and Coonrad (1959) reported traces of copper minerals in a fault zone in green amphibole schist derived from Jurassic mafic volcanic rocks. It appears that this site is along or near the high-angle reverse fault mapped along the west side of Greenstone Ridge (Box and others, 1993). Hoare and Cobb (1977, p. 16) note that this occurrence may also have been referred to in the literature under the names Golden Butte Mines, Inc., Rigagalik River, and Royal Quartz Mines. The Golden Butte Mines occurrence is reported to be quartz veins carrying some gold that were traceable for several hundred feet (Smith, 1932, B 824, p. 22). The Royal Quartz occurrence was reported to be in slate intruded by granitic rocks, and to consist of shear zones with quartz veins that contained Sb, Au, and Ag (Brooks, 1912, p. 35). Geologically, neither the Royal Quartz or the Golden Butte Mines occurrences appears to be the same one as at this locality; they apparently were not located by Cobb (1972 [MF 455]) or Hoare and Cobb (1977). The Rigagalik River occurrence in the upper part of the Kisaralik River is described in a separate record (BH021).
Geologic map unit (-160.192268798076, 60.4892583157514)
Mineral deposit model Copper-bearing minerals in fault zone.
Age of mineralization Not known; postdates host Jurassic volcanic rocks.

Production and reserves

Workings or exploration Limited surface observations appear to be the extent of activity at this locality.
Indication of production None

References

MRDS Number A013383; A013384
Reporters Travis L. Hudson
Last report date 3/24/2001