Geologic descriptionThe occurrence is characterized as polymetallic sulfide mineralization in altered volcanic rocks. A Cretaceous volcanic assemblage of diverse lithologies and compositions makes up the bedrock in the Boxer River drainage (Patton and Csejtey, 1980). A pyrite gossan in volcanic rocks is mapped in the area between the first east tributary and the main drainage of Boxer River (Patton and Csejtey, 1971, p. C9, C12). Stream sediment samples from this east tributary (Patton and Csejtey, 1972) indicate a polymetallic character to nearby mineralization. These stream sediment samples contain up to 150 ppm lead, 2 ppm silver, 50 ppm molybdenum, 700 ppm copper, and 30 ppm tin. |
Geologic map unit |
(-171.542769327845, 63.3690708763842) |
Mineral deposit model |
Polymetallic veins? (Cox and Singer, 1986; model 22c?). |
Mineral deposit model number |
22c? |
Age of mineralization |
Mid-Cretaceous (?) - the age of K/Ar dated intrusive and volcanic rocks on western St. Lawrence Island (Patton and Csejtey, 1980). However, younger Late Cretaceous and Tertiary igneous rocks are also present on the island (Patton and Csejtey, 1980) and the age of mineralization could be younger than mid-Cretaceous. |
Alteration of deposit |
A pyrite gossan in volcanic rocks is present here and alteration is probably significant but it has not been described. The volcanic assemblage is commonly propylitically altered in the region (Patton and Csejtey, 1980). |