Treadwell tailings

Mine, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale B-2
Latitude 58.2712
Longitude -134.3796
Nearby scientific data Find additional scientific data near this location
Location and accuracy This man-made placer mine is on the southwest shore of Gastineau Channel, on the northeast shore of Douglas Island, immediately southeast of the Douglas boat harbor. It is in about the center of the E1/2 section 36, T. 41 S., R. 67 E. of the Copper River Meridian. The location is accurate.

Geologic setting

Geologic description

This deposit consists of mill tailings from the Treadwell stamp mills, which processed ore from the Treadwell Mines group that included the Treadwell (JU199), 700-Foot (JU200), Mexican (JU201), and Ready Bullion (JU206) mines. Between 1885 and 1923, the Treadwell Group collectively mined 28 million tons of ore that produced 3.2 million ounces of gold and more than 180,000 ounces of silver. The tailings were worked intermittently before 1940 but there is no public record of the amount of gold that was recovered. The tailings were worked again from 1943 to 1949, when 320 ounces of gold and 12 ounces of silver were produced. There is an estimated resource of 15 million tons of tailings that contain 0.0004 ounce of gold per ton (Redman and others, 1989).
Geologic map unit (-134.381367999446, 58.2708715135914)

Production and reserves

Workings or exploration See Treadwell mine (JU199).
Indication of production Yes; small
Reserve estimates There is an estimated resource of 15 million tons of tailings that contain 0.0004 ounce of gold per ton (Redman and others, 1989).
Production notes The tailings were worked intermittently before 1940 but there is no public record of the amount of gold recovered. The tailings were worked again from 1943 to 1949, when 320 ounces of gold and 12 ounces of silver were produced.

References