Cathedral

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; pyrite; pyrrhotite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-1
Latitude 56.075
Longitude -130.285
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Cathedral prospect is in Section 25 at an elevation of about 3100-3400 feet on the south end of the bold ridge between Chickamin and West Texas glaciers, just above west-facing cliffs (Berg and others, 1977, p. 90; Elliott and Koch, 1981, p. 11, loc. 25). The location is accurate to within about a quarter of a mile.

Geologic setting

Geologic description

The country rocks in the area of the Cathedral prospect include pelitic metasedimentary strata of the Jurassic or older Mesozoic Hazelton Group; the Triassic Texas Creek Granodiorite, which underlies and locally intrudes the Hazelton; and the Eocene Hyder Quartz Monzonite, which intrudes the Hazelton and Texas Creek rocks (Berg and others, 1977, p. 15-18, 22-23; Smith, 1977; Koch, 1996).
The deposit (Berg and others, 1977, p. 38-39, 90-91; Elliott and Koch, p. 11, loc. 25) consists of quartz fissure veins up to about 5 feet thick in graywacke hornfels. The veins contain shoots of nearly massive sphalerite and (or) galena, together with subordinate amounts of chalcopyrite, pyrite, and pyrrhotite.
Channel samples collected in 1972 by the U.S. Bureau of Mines across the full width of the thickest (5-foot) vein and its 7-inch-thick footwall massive sulfide zone averaged 70 ppm Ag, 0.17 percent Cu, 0.75 percent Pb, and 7.5 percent Zn. A channel sample only of the massive sulfide contained 4.4 oz Ag per ton, 0.27 percent Cu, 0.9 percent Pb, and 35 percent Zn. One analysis showed 0.05 ppm Au. Samples of a smaller (2.5-inch-thick) sulfide-bearing vein assayed 20 oz Ag per ton, 19 percent Pb, and 9 percent Zn.
Geologic map unit (-130.286705682949, 56.0746874943218)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Locally intense iron staining.

Production and reserves

Workings or exploration
Early workings included an approximately 10-foot-long stripped area.
Channel samples collected in 1972 by the U.S. Bureau of Mines across the full width of the thickest (5-foot) vein and its 7-inch-thick footwall massive sulfide zone averaged 70 ppm Ag, 0.17 percent Cu, 0.75 percent Pb, and 7.5 percent Zn. A channel sample only of the massive sulfide contained 4.4 oz Ag per ton, 0.27 percent Cu, 0.9 percent Pb, and 35 percent Zn. One analysis showed 0.05 ppm Au. Samples of a smaller (2.5-inch-thick) sulfide-bearing vein assayed 20 oz Ag per ton, 19 percent Pb, and 9 percent Zn.
Indication of production None

Additional comments

Four claims staked in 1930 probably covered this prospect.
Site is in Misty Fiords National Monument.

References