Moose Jaw

Prospect in Alaska, United States with commodities Gold, Antimony, Arsenic, Mercury

Geologic information

Identification information

Deposit ID 10307772
Record type Site
Current site name Moose Jaw

Geographic coordinates

Geographic coordinates: -155.997, 63.54546 (WGS84)
Relative position The Moose Jaw prospect is located in the apex of a north-facing, steep spur of the Cripple Creek Mountains at an elevation of 2,050 feet (625 m) in Section 32, T. 22 S., R. 15 E., of the Kateel River Meridian. Location is precisely known; reporter visited the site in 1996.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Primary
Arsenic Secondary
Mercury Secondary

Materials information

Materials Type of material
Stibnite Ore
Quartz Gangue

Alteration

  • (Local) Stibnite locally altered to stibiconite.

Mineral occurrence model information

Model code 180
USGS model code 27d
Deposit model name Simple Sb (veins, pods, etc)

Nearby scientific data

(1) -155.997, 63.54546

Comments on the geologic information

  • Geologic Description = The Moose Jaw deposit is a quartz-stibnite vein deposit that cuts the hornfels aurole of the Cripple Creek Mountains Pluton near the head of Colorado Creek drainage. The deposit is conspicuously marked by a slight break or notch in a steep scree slope of hornfels outcrops and rubble. The quartz-stibnite vein trends north 55 degrees east for a distance of at least 700 feet (213 m); talus buries the vein on both ends. Where exposed, the vein varies from 1.5 to 4.0 feet (0.45 to 1.20 m) in width. . Very coarse stibnite blades up to 12 inches (30 cm) long form clusters and rosettes throughout the vein structure. Massive, finer grained stibnite makes up about 20 percent of the Moose Jaw vein, whereas disseminated stibnite zones characterize about 30 percent of the vein. About 50 percent of the vein consists of mixtures of massive to coarse, bladed stibnite and euhedral quartz crystals, disseminated quartz, and stockwork style zones in hornfels. Age of mineralization is inferred to be Late Cretaceous based on 71.0 Ma age of adjacent pluton (Bundtzen and others, 1997). Pits have been dug along about 400 feet (122 m) of strike of the vein; however, the first published descriptions are from Bundtzen and other (1997). Four chip-channel samples along about 600 feet (182 m) of the Moose Jaw prospect contained 31 to 1,675 ppb gold, 0.20 to 44.90 percent antimony, 40 to 50 ppm mercury, and 580 to 14,600 ppm arsenic.
  • Age = Late Cretaceous (inferred) based on 71.0 Ma age of adjacent pluton (Bundtzen and others, 1997).

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Innoko

Comments on the production information

  • Production Notes = Large and impressive stibnite crystals and blades that are very abundant throughout vein structure might have mineral specimen potential.

Comments on the workings information

  • Workings / Exploration = In previous years, pits were dug along about 400 feet (122 m) of strike of the vein; however, the first published descriptions are from Bundtzen and other (1997). Four chip-channel samples along about 600 feet (182 m) of the Moose Jaw prospect contained 31-to-1,675 ppb gold, 0.20-to-44.90 percent antimony, 40 to 50 ppm mercury, and 580 to 14,600 ppm arsenic.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MD019

Bibliographic references

  • Deposit

    Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.

  • Deposit

    Bundtzen, T.K., Pinney, D.S., and Laird, G.M., 1997, Preliminary geologic map and descriptive data tables from the Ophir C-1 and western Medfra C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 97-46, 10 p., 1 sheet, scale 1:63,360.

Comments on the references

  • Primary Reference = Bundtzen and others, 1997

General comments

Subject category Comment text
Deposit Model Name = Simple stibnite deposit (Cox and Singer, 1986; model no. 27d)
Deposit Other Comments = See Wyoming Lode (MD016) in Medfra C-6 quadrangle.

Reporter information

Type Date Name Affiliation Comment
Reporter 03-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting