Makushin Valley NC

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals pyrite
Gangue minerals magnetite

Geographic location

Quadrangle map, 1:250,000-scale UN
Quadrangle map, 1:63,360-scale C-3
Latitude 53.9167
Longitude -166.7667
Nearby scientific data Find additional scientific data near this location
Location and accuracy North central part of Makushin Valley; anomaly no. 5 of Christie (1974).

Geologic setting

Geologic description

Small color anomaly in Unalaska Formation (see Drewes and others, 1961) at contact with porphyritic diorite. Diorite has miarolitic cavities and contains less than 0.5 percent pyrite and abundant magnetite. Christie (1974) reports this as a small system, yet in notes indicates it is a 1 mile (1.6 km) by 0.5 mile (800 m) northeast trending zone.
Geologic map unit (-166.768587578902, 53.9158404854915)
Mineral deposit model Porphyry Cu (Cox and Singer, 1986; model 17?) or Epithermal veins (Cox and Singer, 1986; model 25c?).
Mineral deposit model number 17? or 25?
Age of mineralization Cenozoic
Alteration of deposit Diorite shows alteration to epidote and chlorite, probably propylitic alteration. Partial leaching reported reported but not of what was leached.

Production and reserves

Workings or exploration Six samples collected showed very low silver, gold, copper, and molybdenum, probably not much above background.
Indication of production None


MRDS Number A106008


Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters Damon Bickerstaff, F.H. Wilson
Last report date 5/3/1994