Ibex Saddle

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

Geologic information

Identification information

Deposit ID 10308518
Record type Site
Current site name Ibex Saddle

Geographic coordinates

Geographic coordinates: -130.18576, 56.08277 (WGS84)
Relative position 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.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Lead Primary
Zinc Primary

Materials information

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

Alteration

  • Andesite hostrock is silicified and impregnated with sulfide minerals.

Mineral occurrence model information

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

Nearby scientific data

(1) -130.18576, 56.08277

Comments on the geologic information

  • 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% Pb, and 7.5% 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).
  • Age = 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).

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Mining district

District name Hyder

Comments on the workings information

  • Workings / 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% Pb, and 7.5% Zn.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF BC084

Bibliographic references

  • 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

    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.

  • Deposit

    Maas, K.M., Bittenbender, P E., and Still, J.C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U.S. Bureau of Mines Open-File Report 11-95, 606 p.

  • 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 = Maas and others, 1995

General comments

Subject category Comment text
Deposit Model Name = Polymetallic veins

Reporter information

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