Coon and Plowman

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Pb
Ore minerals arsenopyrite; galena; pyrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale D-7
Latitude 60.8957
Longitude -149.5547
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is in the SW1/4 section 1, T. 9 N., R. 2 W., of the Seward Meridian. It is at 1,600 feet elevation, on the north side of Bear Creek along a small north-flowing tributary about 2 miles from the head of Bear Creek. This is location 9 of Cobb and Tysdal (1980), location 4 of Cobb and Richter (1972), and location S-302 of Jansons and others (1984). Cobb and Tysdal (1980) summarized the relevant references under the name Coon (and Plowman).

Geologic setting

Geologic description

This deposit consists of sulfide-bearing, quartz-calcite veins that are 2 inches to 1 foot thick in a shear zone at least 7 feet wide that cuts slate and graywacke host rock of the Valdez Group of Late Cretaceous age (Martin and others, 1915). The veins contain silver, galena, arsenopyrite, pyrite, and argentiferous galena. The veins and shear zone strike N30E and dip vertically, nearly parallel to bedding of the host rock.
Geologic map unit (-149.556873859519, 60.8951368982166)
Mineral deposit model Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the veins cut rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration In 1915, development work consisted of an open cut 7 feet wide with a 15-foot vertical face. The cut was in a small gulch that follows the shear zone (Martin and others, 1915). A 40-foot adit was present in 1933 (Tuck, 1933) but has caved (Tysdal, 1978 [MF-880-A]).
Indication of production None

References

MRDS Number A010372

References

Mitchell, P.A., 1979, Geology of the Hope-Sunrise (gold) mining district, north-central Kenai Peninsula, Alaska: Stanford University Master of Science thesis, 123 p.
Reporters Jeff A. Huber (Anchorage)
Last report date 1/11/2000