Union Gulch

Mine, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale NM
Quadrangle map, 1:63,360-scale C-1
Latitude 64.6105
Longitude -165.2154
Nearby scientific data Find additional scientific data near this location
Location and accuracy This alluvial gold placer mine is on Union Gulch, a northeast headwater tributary to Buster Creek (NM304). The map location is at an elevation of about 250 feet, in the north-central part of section 23, T. 10 S., R. 33 W., Kateel River Meridian. It is locality 116 of Cobb (1972 [MF 463], 1978 [OFR 78-93]).

Geologic setting

Geologic description

The gravels in Union Gulch are only 10 to 20 feet wide and 30 inches thick, but they are auriferous and estimated to contain about 0.2 ounce of gold per cubic yard (Collier and others, 1908). The coarse and rusty gold is concentrated on bedrock. High-angle faults juxtapose marble- and schist-rich units in this area (Hummel, 1962 [MF 247]).
Geologic map unit (-165.218010515031, 64.6097398140463)
Mineral deposit model Alluvial placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration It is not known if other than small-scale and local hand mining took place at this site.
Indication of production Yes; small