Mid Vein

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities As
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale UN
Quadrangle map, 1:63,360-scale C-3
Latitude 53.9316
Longitude -166.6719
Nearby scientific data Find additional scientific data near this location
Location and accuracy Located approximately 1.2 km north of Makushin River between the Mak North and Makushin Valley prospects, about 2.5 km inland of Broad Bay and 1.25 km NW of the Makushin Valley prospect.

Geologic setting

Geologic description

Very similar to Makushin Valley (UN009) vein; in particular the east-west trending part of the Makushin Valley vein system. Quartz veins occur in propylitically altered porphyritic andesite and andesitic volcaniclastic rocks of the Unalaska Formation (see Drewes and others, 1961). Discontinuously exposed for at least 900 m on strike, having a width of 5 to 7.5 m.
Geologic map unit (-166.673789565057, 53.9307348804315)
Mineral deposit model Epithermal gold vein
Mineral deposit model number 25
Age of mineralization Late Tertiary or younger
Alteration of deposit Regional propylitic alteration; no apparent wall-rock alteration around vein.

Production and reserves

Workings or exploration Twelve channel samples collected along discontinuous outcrop. Six samples yielded gold values between 100 and 650 ppb. The 2 highest samples yielded 1,062 ppb (over 6 m) and 1,748 ppb (over 2 m) gold.
Indication of production None

Additional comments

See UN009, UN010

References

MRDS Number A106005

References

Randolph, D.B., 1991, Unalaska project, 1990 final report: Battle Mountain Exploration Company, Alaska District, 62 p., 5 appendices, 15 plates, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reporters F.H. Wilson
Last report date 12/18/1992