Virginia

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; pyrrhotite; sphalerite; tetrahedrite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-1
Latitude 56.04
Longitude -130.042
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Virginia prospect is at the southwest corner of Section 24 at an elevation of about 600 feet, between an abandoned aerial tramway and the old road that follows the Salmon River to the International Boundary (Elliott and Koch, 1981, p. 16, loc. 61). The location is accurate to within about 0.1 mile.

Geologic setting

Geologic description

The country rocks in the area of the Virginia prospect are pelitic metasedimentary and subordinate andesitic metavolcanic (greenstone) strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; the Eocene Boundary Granodiorite, which intrudes the Hazelton and Texas Creek rocks; and still-younger Tertiary lamprophyre dikes that cut all the other rocks (Smith, 1973, 1977; Koch, 1996).
The deposit (Buddington, 1925, p. 74, 84; 1929, p. 43, 88-89) is in a mineralized shear zone in porphyritic greenstone cut by granodiorite and lamprophyre (?) dikes. An interval 12-16 feet wide in the 50-foot wide shear zone contains an oreshoot of nearly solid sulfides, accompanied by quartz gangue. The sulfides are pyrrhotite, sphalerite, pyrite, and a little galena and tetrahedrite. The greenstone also contains disseminated sulfide minerals, stringers of quartz, calcite, and sulfide minerals. Near contacts of granodiorite porphyry dikes, the greenstone also contains the contact-metamorphic minerals garnet and epidote. A little chalcopyrite occurs along with the other sulfides in some of the epidote-rich greenstone.
Selected samples of the ore reportedly assayed as high as 4.5 oz Au per ton.
Geologic map unit (-130.043704578501, 56.0397056811962)
Mineral deposit model Polymetallic veins, Skarn Zn-Pb (Cox and Singer, 1986; model 22c, 18c).
Mineral deposit model number 22c; 18c
Alteration of deposit Local contact metamorphism of greenstone; greenstone is impregnated with sulfide minerals.

Production and reserves

Workings or exploration
Prospect was explored in 1920s by 600-700 feet of crosscuts and tunnels.
Selected samples of the ore reportedly assayed as high as 4.5 oz Au per ton; average Au content was about 0.25 oz per ton.
Indication of production None

Additional comments

Deposit originally staked in 1919.

References