Iron Cap

Prospect, Undetermined

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Ore minerals galena; pyrite; sphalerite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-1
Latitude 56.075
Longitude -130.212
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Iron Cap prospect (Maas and others, 1995, p. 233, 235, 245) is in Section 11 at an elevation of about 4700 feet. It is on a south-facing mountainside overlooking the West Fork of Texas Creek, and about 2.3 miles northeast of Texas Lake. The location is accurate within about 0.1 mile.

Geologic setting

Geologic description

The country rocks in the area of the Iron Cap prospect are pelitic metasedimentary and subordinate andesitic volcanic strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Texas Creek; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1977; Koch, 1996).
Maas and others (1995, p. 235,245) describe the deposit as lenses and disseminations of pyrite, galena, and sphalerite in quartz-carbonate lenses in Hazelton argillite. Lead-isotope studies of galena from the prospect (Maas and others, p. 235) indicate that the deposit is Jurassic in age, contemporaneous at least in part with island-arc volcanism in Hazelton time (Alldrick, 1993).
Samples of the deposit collected by the U.S. Bureau of Mines in 1992 or 1993 (Maas and others, 1995, p. 245) contain up to 42.9 ppm Ag, 7270 ppm Pb, and 4.76 percent Zn.
Geologic map unit (-130.213705420447, 56.0746930334054)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Maas and others (1995, p. 235,245) describe the deposit as lenses and disseminations of pyrite, galena, and sphalerite in quartz-carbonate lenses in Hazelton argillite. Lead-isotope studies of galena from the prospect (Maas and others, p. 235) indicate that the deposit is Jurassic in age, contemporaneous at least in part with island-arc volcanism in Hazelton time (Alldrick, 1993).
Alteration of deposit Sulfides disseminations in argillite hostrock.

Production and reserves

Workings or exploration
Deposit has been explored by a trench.
Samples of the deposit collected by the U.S. Bureau of Mines in 1992 or 1993 (Maas and others, p. 245) contain up to 42.9 ppm Ag, 7270 ppm Pb, and 4.76 percent Zn.
Indication of production None

References