Cathedral

Prospect in Alaska, United States with commodities Silver, Gold, Copper, Lead, Zinc

Geologic information

Identification information

Deposit ID 10000157
MRDS ID A010194
Record type Site
Current site name Cathedral
Related records 10185430

Geographic coordinates

Geographic coordinates: -130.28676, 56.07477 (WGS84)
Relative position 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.
(click for info)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Zinc Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Pyrite Ore
Pyrrhotite Ore
Sphalerite Ore
Quartz Gangue

Alteration

  • (Local) Locally intense iron staining.

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Rock unit name Hazelton Group
    Rock description Hazelton Group

Nearby scientific data

(1) -130.28676, 56.07477

Comments on the geologic information

  • Geologic Description = The country rocks in the area of the Cathedral prospect include pelitic metasedimentary strata of the Jurassic or older Mesozic 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% Cu, 0.75% Pb, and 7.5% Zn. A channel sample only of the massive sulfide contained 4.4 oz Ag per ton, 0.27% Cu, 0.9% Pb, and 35% 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% Pb, and 9% Zn.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the workings information

  • Workings / 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% Cu, 0.75% Pb, and 7.5% Zn. A channel sample only of the massive sulfide contained 4.4 oz Ag per ton, 0.27% Cu, 0.9% Pb, and 35% 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% Pb, and 9% Zn.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010194
USGS Alaska Resource Data File ARDF BC025

Bibliographic references

  • Deposit

    Berg, H.C., Elliott, R.L., Smith, J.G., Pittman, T.L., and Kimball, A. L., 1977, Mineral resources of the Granite Fiords wilderness study area, Alaska, with a section on aeromagnetic data by Andrew Griscom: U.S. Geological Survey Bulletin 1403, 151 p.

  • Deposit

    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.

  • Deposit

    Elliott, R.L., and Koch, R.D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

  • Deposit

    Koch, R.D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728-A, 35 p., 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Berg and others, 1977

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins
Deposit Other Comments = Four claims staked in 1930 probably covered this prospect.?Site is in Misty Fiords National Monument.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-MAY-1998 H. C. Berg U.S. Geological Survey