Unnamed (south of Rodman Bay)

Prospect, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold; unspecified sulfides
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale SI
Quadrangle map, 1:63,360-scale B-5
Latitude 57.4102
Longitude -135.3792
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 550 feet, about 1.8 miles south-southeast of the south end of Rodman Bay. The prospect is 0.1 mile south-southwest of the northeast corner of sec. 36, T. 51 S., R. 62 E. It is location P-98 of Bittenbender and others (1999), location 52 of Cobb (1972, 1978), and MAS no. 0021140075 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.2 mile.

Geologic setting

Geologic description

Loney and others (1975) map the rocks in the area of this prospect as Triassic(?) phyllite and greenstone, and undivided Mesozoic metasedimentary and metavolcanic strata. The rocks are complexly folded and cut by diverse, mainly northwest-striking, high-angle faults.
Wright and Wright (1905) describe this prospect as a mineralized belt several hundred feet wide of wrinkled slate that contains interlaced quartz and calcite stringers with (unspecified) sulfides and gold. The slate is intruded by diabase dikes and a granodiorite pluton crops out a few miles away. Workings in the early 1900s included a 700-foot tunnel and considerable surface exploration, and construction of a 7-mile-long railroad to tidewater. The deposit reportedly is very low grade and there is no record of any production. Wright (1907) and Wright and Wright (1905) describe this prospect as an auriferous quartz vein. A high-grade, picked sample assayed 45 parts per billion gold (Bittenbender and others, 1999). Knopf (1912, p. 8) termed this prospect 'A remarkable mining failure.'
Geologic map unit (-135.380977330926, 57.4098509516831)
Mineral deposit model Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a

Production and reserves

Workings or exploration Workings in the early 1900s included a 700-foot tunnel and considerable surface exploration; and construction of a 7-mile-long railroad to tidewater.
Indication of production None

References

MRDS Number A013299

References

Reporters H.C. Berg (U.S. Geological Survey)
Last report date 10/16/2004