Unnamed (near south end of Port San Antonio)

Prospect, Undetermined

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu; Pb; Zn
Ore minerals bornite; chalcopyrite; galena; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale B-5
Latitude 55.33355
Longitude -133.60953
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is a vein that extends from near the head of the south arm of Port San Antonio about 4,000 feet south-southeast toward Mount Miramar. The coordinates are at the north end of the vein in about the center of the SE1/4 section 30, T. 75 S., R. 78 E.

Geologic setting

Geologic description

A quartz vein crops out on the beach at the southeast end of the south arm of Port San Antonio (Roehm (1936 [PE 119-3]). It can be traced S65E for about 4,000 feet and averages about 2 to 3 feet thick. The veins cuts both the Cretaceous granite south of Port San Antonio and the Silurian or Ordovician argillite and graywacke of the Descon Formation peripheral to the granite (Eberlein and others, 1983; Brew, 1996). The most intense mineralization is 200 to 300 feet from the granite contact. The vein contains pyrite, sphalerite, and galena, with minor chalcopyrite and bornite. Several channel samples contained a trace of gold and up to 2 ounces of silver per ton. In 1916, the prospector who discovered the vein said that it averaged about $3 per ton in gold (at $20.67 per ounce?) and 4 ounces of silver per ton over a distance of 3,000 feet. The vein has been prospected by several trenches and open cuts. This may be the prospect described by Wright and Wright (1908) as quartz veinlets with galena, sphalerite, and pyrite that cut argillite, but they locate it on the north side of Port San Antonio.
Geologic map unit (-133.611214340688, 55.333201673427)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The vein cuts a Cretaceous pluton.

Production and reserves

Workings or exploration The vein has been prospected by several trenches and open cuts.
Indication of production None

References