Silver Coin

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Pb
Ore minerals chalcopyrite; galena; pyrite; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-1
Latitude 56.0779
Longitude -130.167
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Silver Coin occurrence is in Section 7 at an elevation of about 4150 feet on a south-facing mountainside about 0.4 mile east of upper Ibex Creek (Elliott and Koch, 1981, p. 14, loc. 50). The location is probably accurate within about a quarter of a mile.

Geologic setting

Geologic description

The country rock in the area of the Silver Coin occurrence is Triassic Texas Creek Granodiorite, which regionally underlies and locally intrudes pelitic metasedimentary and subordinate andesitic metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Koch, 1996).
Buddington (1925, p. 90; 1929, p. 95) describes the deposit as a quartz fissure vein up to about 10 feet thick and 50 feet long in a shear zone in granodiorite. The northern 25 feet of the vein contains a shoot as much as 5 feet thick of massive galena, accompanied by a little pyrite and chalcopyrite. The remainder of the vein is barren. A little malachite occurs on shear surfaces in the granodiorite footwall of the ore shoot.
Lead-isotope studies of galena from the Silver Coin occurrence (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Geologic map unit (-130.168705301739, 56.0775964558317)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Lead-isotope studies of galena from the Silver Coin occurrence (Maas and others, 1995, p. 229-248) indicate that the deposit is Eocene in age, contemporaneous with emplacement of the Hyder Quartz Monzonite.
Alteration of deposit Minor oxidation of chalcopyrite to malachite.

Production and reserves

Indication of production None

Additional comments

Site probably originally staked in 1923.

References