Unnamed (near Security Cove)

Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Ag; Ba; Zn
Other commodities As; Au
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale DE
Quadrangle map, 1:63,360-scale C-3
Latitude 54.7473
Longitude -132.8581
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence, which was first sampled and described by Maas and others (1991), is near the tip of a small peninsula that juts out on the north side of Security Cove just inside its entrance. It is near the center of the east boundary of the NE1/4 section 21, T 82 S., R. 84 E.

Geologic setting

Geologic description

The rocks in the vicinity of this occurrence are pre-Ordovician basaltic metavolcanic rocks, dacitic metavolcanic rocks, phyllite, and marble (Gehrels, 1991). As described by Maas and others (1991), the occurrence is a 20-foot zone with thin layers of pyrite 0.1 to 0.5 foot thick, interbedded with marble and chlorite schist. Their best sample across a 0.5-foot-thick layer of pyrite contained 357 parts per billion gold, 6.3 parts per million (ppm) silver, 2,885 ppm zinc, 1,103 ppm arsenic, and 2.3 percent barite. The pyrite layers apparently do not continue to the south across Security Cove.
Geologic map unit (-132.859762971415, 54.7469555679066)
Mineral deposit model Probably a Kuroko massive-sulfide-type deposit (Cox and Singer, 1986; model 28a).
Mineral deposit model number 28a
Age of mineralization Probably contemporaneous with the pre-Ordovician host rocks.

Production and reserves

Workings or exploration Only sampling by government geologists.
Indication of production None

References