Boulder Creek

Mine, Active?

Commodities and mineralogy

Main commodities PGE
Other commodities Au
Ore minerals gold; platinum-group metal alloys

Geographic location

Quadrangle map, 1:250,000-scale HG
Quadrangle map, 1:63,360-scale D-6
Latitude 58.94
Longitude -161.71
Nearby scientific data Find additional scientific data near this location
Location and accuracy Boulder Creek is a west tributary to Salmon River with headwaters on the east side of Red Mountain. The Platinum to Goodnews Bay Mining Camp road crosses Boulder Creek very near its confluence with Salmon River. The map site is about 1/4 mile upstream of the road crossing. This is location 8 of Cobb (1972 [MF 362]; 1980 [OF 80-909]).

Geologic setting

Geologic description

Boulder Creek is one of several creeks that have headwaters on the east side of the Red Mountain ultramafic pluton. It is about 1 mile long and heads against the summit of Red Mountain. Some placer mining of PGMs has taken place on Boulder Creek, probably along its lower part near Salmon River, but little information about this placer has been made public (Mertie, 1976; Cobb, 1980 [OF 80-909]). A Defense Minerals Exploration Administration contract funded drilling of 50 exploration holes in alluvium along the east side of Red Mountain between Last Chance and Dowry Creeks in 1953. The depths of these drill holes ranged from 5 to 51 feet and the PGM content ranged from 0 to 0.0085 ounce of PGM per cubic yard. The highest values in these holes were on Boulder Creek, where the average PGM content of 8 drill holes was 0.0024 ounce per cubic yard (Fechner, 1988, p. 80). Mertie (1976) reports that PGM recovered from Boulder Creek contained (recomputed free of impurities): 77.99 percent Pt, 16.28 percent Ir, 3.41 percent Os, 0.25 percent Ru, 1.31 percent Rh, 0.21 percent Pd, and 0.55 percent Au.
Geologic map unit (-161.712225546316, 58.939216294557)
Mineral deposit model Placer PGE-Au (Cox and Singer, 1986; model 39b)
Mineral deposit model number 39b
Age of mineralization Quaternary.

Production and reserves

Workings or exploration Some small-scale placer workings are inferred to be present on Boulder Creek, probably along its lower part near Salmon River. A Defense Minerals Exploration Administration contract funded drilling of 50 exploration holes in alluvium along the east side of Red Mountain between Last Chance and Dowry Creeks in 1953. The depths of these drill holes ranged from 5 to 51 feet and the PGM content ranged from 0 to 0.0085 ounce of PGM per cubic yard. The highest values in these holes were on Boulder Creek, where the average PGM content of 8 drill holes was 0.0024 ounce per cubic yard (Fechner, 1988, p. 80).
Indication of production Yes; small

References