Unnamed (near Round Mtn)

The Unnamed (near Round Mtn) is a lead, silver, gold, and zinc 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: Unnamed (near Round Mtn)

Commodity

Primary: Lead
Primary: Silver
Primary: Gold
Primary: Zinc
Secondary: Arsenic
Secondary: Antimony

Location

State: Alaska
District: Yentna

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: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Quartz-sericite-pyrite, quartz-pyrite, carbonate, and magnetite alteration.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Stibnite
Ore: Sphalerite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Galena
Ore: Chalcopyrite
Ore: Arsenopyrite
Gangue: Sericite
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c).

Comment (Deposit): Other Comments = Rock exposures at this site are limited to stream cuts.

Comment (Geology): Geologic Description = Mesozoic marine sedimentary rocks (KJs) and (or) undivided Tertiary tuff and tuffaceous sedimentary rocks (Tvs) mapped by (Reed and Nelson, 1980) are intruded by intermediate to mafic sills, dikes and small plugs (Cominco American Incorporated, unpublished report). The intrusive rocks are overprinted by quartz-sericite-pyrite and magnetite-carbonate alteration. Auriferous veins, pods and stockwork which contain variable amounts of pyrite, pyrrhotite, sphalerite, galena and quartz ,+/-chalcopyrite, stibnite and arsenopyrite are concentrated along intrusive contacts and structures. Geochemical values in rock chip samples range from several hundred ppb gold to just under an ounce per ton gold in select high grade samples. Silver values up to about an ounce per ton is recorded select samples (Cominco American Incorporated, unpublished report).

Comment (Geology): Age = Early or middle Tertiary; mineralization is interpreted to be linked to the Tvs, which Reed and Nelson (1980) relate to plutonism of the same age in this part of the Alaska Range.

Comment (Workings): Workings / Exploration = Prospecting, silt, soil and rock chip geochemistry, magnetic and VLF geophysical survey, and mapping at 1:12,000 scale by Cominco American Incorporated in the late 1980s. Geochemical values in rock chip samples range from several hundred ppb gold to just under an ounce per ton gold in select high grade samples. Silver values up to about an ounce per ton is recorded select samples (Cominco American Incorporated, unpublished report).

Comment (Reference): Primary Reference = This record

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, scale 1:250,000.

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