The Yellowhorn is a gold 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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Yellowhorn MRDS details
Site Name
Primary: Yellowhorn
Commodity
Primary: Gold
Secondary: Lead
Secondary: Silver
Location
State: Alaska
District: Valdez Creek
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: Low-sulfide Au-quartz vein
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: There is a color anomaly associated with the prospect due to weathering of pyrite.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Ore: Gold
Ore: Galena
Gangue: Quartz
Comments
Comment (Deposit): Model Name = Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a)
Comment (Reference): Primary Reference = Tuck, 1938
Comment (Workings): Workings / Exploration = Surface trenches and cuts, one short tunnel and one 60-foot tunnel that missed the lode.
Comment (Exploration): Status = Inactive
Comment (Geology): Geologic Description = The country rock at this prospect is miceous schist of unknown age. Foliation strikes 58 SE and dips 18 N. The deposit is a 4-foot-wide shear zone consisting, from the top down, of a one-foot-wide quartz vein, with three feet of schist cut by small quartz seams, and quartz stringers. Most of the quartz is sugary and contains vugs lined with terminated crystals. Good values of gold were panned from the weathered material, but there was some indication that in the unweathered material, the gold was in the sulfides, rather than free-milling (Tuck, 1936).
Comment (Deposit): Other Comments = Shear zones in this area having shallow northward dips are part of a thrust zone best exposed underground at the Denali Copper prospect (HE191).
References
Reference (Deposit): Smith, T.E., 1981, Geology of the Clearwater Mountains, south-central Alaska: Alaska Division of Geological "&" Geophysical Surveys Geologic Report 60, 72 p., 3 sheets, scale 1:63,360.
Reference (Deposit): Tuck, Ralph, 1938, The Valdez Creek mining district, Alaska, in 1936: U.S. Geological Survey Bulletin 897-B, p. 109-131.
Reference (Deposit): Moffit, F.H., 1912, Headwater regions of Gulkana and Susitna Rivers, Alaska: U.S. Geological Survey Bulletin 498, 82 p.
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