Wyoming Lode

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

Geologic information

Identification information

Deposit ID 10001647
MRDS ID A012419
Record type Site
Current site name Wyoming Lode
Related records 10136871

Geographic coordinates

Geographic coordinates: -155.93607, 63.57335 (WGS84)
Relative position The Wyoming prospect is situated on a steep, north-facing spur overlooking the East Fork of Montana Creek and the Main Fork of Wyoming Creek at an elevation of 2,400 feet (731 m) in Section 22, T. 22 S., R. 15 E., of the Kateel River Meridian. The reporter investigated the prospect 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
Arsenopyrite Ore
Cinnabar Ore
Gold Ore
Stibnite Ore
Quartz Gangue

Alteration

  • (Local) Stibnite oxidized to kermesite.

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Associated
    Chronological age 71.2
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -155.93607, 63.57335

Comments on the geologic information

  • 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.
  • 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).
  • Age = Chron age is for the adjacent pluton.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Innoko

Comments on the production information

  • Production Notes = Very coarse stibnite blades have possible mineral speciman quality potential.

Comments on the workings information

  • 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012419
USGS Alaska Resource Data File ARDF MD016

Bibliographic references

  • Deposit

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

  • 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 deposits (Cox and Singer, 1986; model no. 27d)
Deposit Other Comments = See Moose Jaw Lode (MD019).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting