Wyoming Lode

The Wyoming Lode is a gold and antimony mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Wyoming Lode

Commodity

Primary: Gold
Primary: Antimony
Secondary: Arsenic
Secondary: Mercury

Location

State: Alaska
District: Innoko

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Simple Sb (veins, pods, etc)

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Stibnite oxidized to kermesite.

Rocks

Role: Associated
Age Type: Associated Rock
Age in Years: 71.200000+-
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Cinnabar
Ore: Gold
Ore: Stibnite
Gangue: Quartz

Comments

Comment (Geology): Age = Chron age is for the adjacent pluton.

Comment (Geology): Age = The Wyoming Lode is inferred to be Late Cretaceous based on the 71.2 Ma isotopic age of the adjacent pluton (Bundtzen and others, 1997).

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Surface pits and trenches have been excavated to explore the deposit. Five chip-channel samples collected by Bundtzen and others (1997) contain up to 652 ppb gold, 2,830 ppm arsenic, and 45.7 percent antimony. None of the samples contained detectable mercury.

Comment (Deposit): Other Comments = See Moose Jaw Lode (MD019).

Comment (Geology): Geologic Description = The Wyoming Lode consists of three distinct quartz-sulfide-sulfosalt veins that strike North 65 degrees east and dip steeply to vertical. The vein swarm can be traced for about 450 feet (137 m) along the strike and have a collective width of about 200 feet (61 m). The southern-most and highest vein consists of disseminated stibnite and arsenopyrite in a quartz vein that ranges from 1 foot to 3 feet (0.3 to 0.9 m) thick. The northern-most veins, which range from 2 to 5 feet (0.6 to 1.5 m) thick, contain massive to disseminated pods of very coarse-grained, interlocking stibnite blades and euhedral quartz crystals to 9 inches (23 cm) long and uncommon arsenopyrite. Distinctly reddish kermesite, an oxidation product of stibnite, frequently covers the stibnite blades. The textural habitat of the Wyoming and Moose Jaw lode (MD019) 2 miles (3.2 km) to the southwest are quite similar, which suggests both lodes might be related (Bundtzen and others, 1997). Mertie (1936) described the Wyoming lode as a cinnabar-stibnite deposit. However, Bundtzen and others (1997) searched for but could not identify cinnabar in the vein system. ? All mineralized veins at the Wyoming Lode cut hornfels adjacent to the Cripple Creek Mountains pluton, about 0.5 miles (0.8 km) from the sediment-intrusive contact. The Wyoming Lode is inferred to be Late Cretaceous based on the 71.2 Ma isotopic age of the adjacent pluton (Bundtzen and others, 1997).? Five chip-channel samples taken across three of the mineralized veins by Bundtzen and others (1997) contained up to 652 ppb gold, 2,830 ppm arsenic, and 45.7 percent antimony, but no detectable mercury.

Comment (Deposit): Model Name = Simple stibnite deposits (Cox and Singer, 1986; model no. 27d)

Comment (Production): Production Notes = Very coarse stibnite blades have possible mineral speciman quality potential.

Comment (Reference): Primary Reference = Bundtzen and others, 1997

References

Reference (Deposit): Mertie, J.B., Jr., 1936, Mineral deposits of the Ruby-Kuskokwim region, Alaska: U.S. Geological Survey Bulletin 864-C, 115-245.

Reference (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.

Reference (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.

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