Ruby Creek

Mine, Probably inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals garnet; magnetite

Geographic location

Quadrangle map, 1:250,000-scale SO
Quadrangle map, 1:63,360-scale D-5
Latitude 64.799
Longitude -164.316
Nearby scientific data Find additional scientific data near this location
Location and accuracy Ruby Creek is an east tributary to the Casadepaga River. Its mouth is 0.9 miles downstream from the old town of Casdepaga and across the river from the mouth of Lower Willow Creek (SO091). Sainsbury and others (1972) show placer tailings to be present over the lower 2 miles of Ruby Creek. This is locality 79 of Cobb (1972, MF 445; 1978, OF 78-181).

Geologic setting

Geologic description

Ruby Creek was an important and heavily worked creek in the early history of the area (Brooks and others, 1901). It is incised in its lower reaches and both the active channel and some bench placers have been mined. Some of the gold was coarse (a 1/4 ounce nugget was reported) and had a fineness of 946. The gravels in the lower creek were thin, 2 to 3 feet, and gold-bearing throughout. The creek gets its name from the abundant garnet in heavy mineral concentrates. A large part of this creek was mined by 1907 (Smith, 1910). The headwaters of Ruby Creek are underlain by a lower Paleozoic metasedimentary assemblage (Till and othes, 1986).
Geologic map unit (-164.318613897049, 64.7982584591673)
Mineral deposit model Placer Au-PGE (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary; the numerous incised terraces along the Casadepaga River and its major tributaries indicate that more than one cycle of erosion and deposition has developed placer deposits in the area. The low elevations between 170 and 270 feet along the first 11 miles of the river, suggest that Quaternary sea level fluctuations could have influenced placer development.

Production and reserves

Workings or exploration Almost all the creek gravels had been worked by 1907. Sainsbury and others (1972, OFR 511) show placer tailings to be present over the lower 2 miles of Ruby Creek.
Indication of production Yes; small