John Sells

Mine, Inactive

Alternative names

Sells

Commodities and mineralogy

Main commodities Au
Other commodities Ag; Cu; Pb; Zn
Ore minerals arsenopyrite; chalcopyrite; galena; gold; pyrrhotite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale C-4
Latitude 60.7347
Longitude -148.2005
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SE1/4 section 34, T. 8 N., R. 7 E., of the Seward Meridian. It is at an elevation of 725 feet on the east side of Culross Passage about one mile southwest of the head of Culross Bay. This is location 107 of MacKevett and Holloway (1977), location 170 of Cobb and Tysdal (1980), and location S-103 of Jansons and others (1984). Cobb and Tysdal (1980) summarized the relevant references under the name Sells. This location is accurate to within 300 feet.

Geologic setting

Geologic description

The mine is in the Contact Fault zone; this major thrust fault juxtaposes the Valdez Group of Late Cretaceous age with the Orca Group of Tertiary age. The Contact Fault zone formed 65 million to 35 million years ago and ranges from 1 to 6 miles wide. Within this zone are numerous discrete shears. The general trend of the Contact Fault is northeast, but the strike of individual shears may vary widely (Nockleberg and others, 1994).
The country rock at the prospect consists of Valdez Group schistose sandy slate that strikes S30W and dips 80W (Cobb and Tysdal, 1980). The deposit consists of closely grouped quartz lenses and stringers that parallel the schistosity of the country rock in strike and dip. The width of the quartz lenses ranges from 4 to 59 inches, and the maximum exposed length of any lens or stringer is about 15 feet. The area of quartz veins is about 200 feet in length and has an apparent width of at least 15 feet (Johnson, 1914 [B 592-G, p. 236]).
The workings on this prospect consist of a single 100-foot adit, a 15-foot-long open cut, and several prospect pits. The U.S. Bureau of Mines collected 11 samples that contained less than 0.005 ounce of gold per ton. Other results included a 9-foot-wide chip sample containing 0.086 ounce of gold per ton and a 2-foot-wide chip sample of a quartz vein containing 0.374 ounce of gold per ton (Jansons and others, 1984). There is no reported production, although a test shipment of ore was made (Johnson, 1918 [B 662-C, p. 183-192]).
Geologic map unit (-148.202559955203, 60.7340922529687)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Eocene or younger; the Contact Fault zone cuts Eocene granite north of this prospect.

Production and reserves

Workings or exploration The workings on this mine consist of a single 100-foot adit, a 15-foot-long open cut, and several prospect pits. The U.S. Bureau of Mines collected 11 samples that contained less than 0.005 ounce of gold per ton, including a 9-foot-wide chip sample containing 0.086 ounce of gold per ton and a 2-foot-wide chip sample of a quartz vein containing 0.374 ounce of gold per ton (Jansons and others, 1984). There was no reported production, although a test shipment of ore was made (Johnson, 1918 [B 662-C, p. 183-192]).
Indication of production Yes; small
Reserve estimates The U.S. Bureau of Mines estimated a geologic resource of 180 tons at 0.05 ounce of gold per ton (Jansons and others, 1984).

References

MRDS Number A010555

References

Nokleberg, W.J., Plakfer, George, and Wilson, F.H., 1994, Geology of south-central Alaska, p. 311-366, in Plafker, George, and Berg, H.C., eds., The geology of Alaska: Geological Society of America DNAG, The geology of North America, v. G-1.
Reporters Jeff A. Huber (Anchorage)
Last report date 2/11/2000