Iron Cap (ARDF #BC082) Ag, Pb, Zn

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

References Alldrick, D.J., 1993, Geology and metallogeny of the Stewart mining camp, northwestern British Columbia: British Columbia Department of Mines and Petroleum Resources Bulletin 85, 105 p., 2 plates, scale 1:50,000. Smith, J.G., 1977, Geology of the Ketchikan D-1 and Bradfield Canal A-1 quadrangles, Alaska: U.S. Geological Survey Bulletin 1425, 49 p., 1 plate.
Reporters	H. C. Berg (Fullerton, California)
Last report date	5/17/1998