Ibex Saddle

Prospect, Undetermined

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-1
Latitude 56.083
Longitude -130.184
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Ibex Saddle prospect (Maas, 1995, p. 233, 235, 245) is in the south part of Section 1 at an elevation of about 4500 feet, adjacent to the west margin of a small lobe of Texas Glacier at the head of Ibex Creek. The location is accurate within about 0.1 mile.

Geologic setting

Geologic description

The country rocks in the area of the Ibex Saddle prospect are pelitic metasedimentary and subordinate andesitic volcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is underlain and locally intruded by the Triassic Texas Creek Granodiorite; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Smith, 1997; Koch, 1996).
Maas and others (1995, p. 235, 245) describe the deposit as sulfide-bearing silicified (?) andesite. The sulfides are pyrite, galena, and sphalerite. Samples of the deposit collected by the U.S. Bureau of Mines in 1992 or 1993 contain up to 656 ppb Au, 40.7 ppm Ag, 2705 ppm Cu, 2.6 percent Pb, and 7.5 percent Zn.
Lead-isotope studies of galena from the Ibex Saddle prospect (Maas and others, 1995, p. 235) indicate that the deposit is Jurassic in age, contemporaneous, at least in part, with island-arc volcanism in Hazelton time (Alldrick, 1993).
Geologic map unit (-130.185705402495, 56.0826951961369)
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 Ibex Saddle prospect (Maas and others, 1995, 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 Andesite hostrock is silicified and impregnated with sulfide minerals.

Production and reserves

Workings or exploration 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 656 ppb Au, 40.7 ppm Ag, 2705 ppm Cu, 2.6 percent Pb, and 7.5 percent Zn.
Indication of production None

References