|Quadrangle map, 1:250,000-scale||BC|
|Quadrangle map, 1:63,360-scale||A-1|
|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.|
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.|
|Indication of production||None|
Additional commentsSite probably originally staked in 1923.
|Reporters||H. C. Berg (Fullerton, California)|
|Last report date||5/17/1998|