Prospect, Undetermined

Commodities and mineralogy

Main commodities Au; Cu
Ore minerals chalcopyrite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-1
Latitude 55.14702
Longitude -132.04263
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Alpha prospect is about 0.2 mile north of the center of Lake Williams and about 0.4 mile southwest of the center of section 32, T. 77 S., R. 89 E.

Geologic setting

Geologic description

As described by Brooks (1902) and Wright and Wright (1908), the Alpha prospect is a quartz vein up to 5 feet wide that can be traced for nearly 2,000 feet. The vein is in white crystalline marble and strikes about north and dips 45W. It contains sparse pyrite and chalcopyrite; early samples contained about $4 to $25 per ton in gold (at $20.67 per ounce). Maas and others (1991, 1995) found a caved shaft, a short adit, and several trenches. Their samples contained up to 62 parts per billion gold and 1.8 percent copper. The rocks in the Dolomi area are part of the Wales Group of Late Proterozoic and Cambrian age (Herreid, 1967). They are folded into a large dome centered over the eastern third of Paul Lake, and consist of several marble layers 200 to 1300 feet thick, interbedded with calcareous chlorite schist and marble.
Geologic map unit (-132.044301883515, 55.1466642857933)
Mineral deposit model Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization Vein is younger than the Late Proterozoic or Cambrian host rocks.

Production and reserves

Workings or exploration The workings include a shallow, caved shaft, a short adit, and several trenches.
Indication of production None
Reserve estimates None.
Production notes Apparently none.