Sulphide Gulch

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu; W
Ore minerals chalcopyrite; gold; limonite; pyrite; scheelite
Gangue minerals garnet; pyroxene; zircon

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale A-6
Latitude 61.017
Longitude -146.0624
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is apparently on an unnamed south tributary to the lower Lowe River. The mouth of this tributary is 3.3 miles upstream from Canyon Slough. Cobb and Matson (1972, locality 79) call this occurrence 'Sulphide Gulch' , but USGS topographic maps show Sulphide Gulch about a mile west of Canyon Slough. The location shown by Cobb and Matson (1972, locality 79) is used here; it is at the center of section 11, T. 10 S., R. 5 W., of the Copper River Meridian. The accuracy of this location is uncertain.

Geologic setting

Geologic description

Heavy mineral concentrate from stream gravels at this occurrence contained gold, scheelite, chalcopyrite, pyrite, limonite, pyroxene, garnet, and zircon (Rose, 1965). Bedrock in the area is greenschist-facies metaflysch of the Late Cretaceous Valdez Group (Winkler and others, 1981 [OFR 80-892-A]). Gold-bearing quartz veins are widespread through the Valdez Group in the southern Valdez quadrangle (Cobb and Matson, 1972). Two massive sulfide prospects in mafic metavolcanic rocks of the Valdez Group (VA134 and VA143) are located upstream from this occurrence (Winkler and others, 1981 [OFR 80-892-B]).
Geologic map unit (-146.064417276283, 61.0164825344688)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Holocene.

Production and reserves

Workings or exploration Only reconnaissance sampling has been done.
Indication of production None

References