Unnamed (near head of Hope Creek)

The Unnamed (near head of Hope Creek) is a fluorine-fluorite 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 head of Hope Creek)

Commodity

Primary: Fluorine-Fluorite
Secondary: Zinc
Secondary: Molybdenum
Secondary: Copper
Secondary: REE
Secondary: Antimony
Secondary: Tungsten
Secondary: Lead

Location

State: Alaska
District: Circle

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Name: Granite
Role: Associated
Age Type: Associated Rock
Age Young: Paleocene

Analytical Data

Not available

Materials

Ore: Galena
Ore: Chalcopyrite
Ore: Arsenopyrite
Ore: Allanite
Ore: Stibnite
Ore: Sphalerite
Ore: Scheelite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Molybdenite
Ore: Marcasite
Ore: Malachite
Ore: Fluorite
Gangue: Rutile

Comments

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Holm, 1973.

Comment (Workings): Workings / Exploration = Surface samples taken.

Comment (Geology): Age = The principal occurrence is a fluorite vein in a fine-grained quartz- and opal-bearing breccia zone in a contact phase of biotite granite. The biotite in the granite has been dated at 59.5 +/- 1.8 m.a. by the K/Ar method (Holm, 1973).

Comment (Geology): Geologic Description = The occurrence is a 15-cm-wide fluorite vein in a fine-grained quartz- and opal-bearing breccia zone in a contact phase of biotite granite. Minor sulfide mineralization occurs in carbonate-bearing metamorphic rocks at the head of Hope Creek. Sulfides present are pyrrhotite, marcasite, and sphalerite with blebs of chalcopyrite, pyrite and arsenopyrite. None of these minerals occurs in quantities of economic significance. Samples of granite taken near the head of Hope Creek contained trace to small amounts of allanite (?), fluorite, galena, malachite, molybdenite, pyrite, pyrrhotite, rutile, scheelite and stibnite (Holm, 1973). Biotite from this granite has been dated at 59.5 +/- 1.8 m.a. by the K/Ar method (Holm, 1973).

References

Reference (Deposit): Nelson, A.E., West, W.S., and Matsko, J.J., 1954, Reconnaissance for radioactive deposits in eastern Alaska: U.S. Geological Survey Circular 348, 21 p.

Reference (Deposit): Holm, Bjarne, 1973, Bedrock geology and mineralization of the Mount Prindle area, Yukon-Tanana upland: University of Alaska, Fairbanks, M.Sc. thesis, 55 p.

Reference (Deposit): Foster, H.L., Laird J., Keith T.E.C., Cushing, G.W., and Menzie, W.D., 1983, Preliminary geologic map of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-A, 1 sheet, scale 1:250,000.

Reference (Deposit): Menzie, W.D., Foster, H.L., Tripp, R.B., and Yeend, W.E., 1983, Mineral resource assessment of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-B, 61 p., 1 sheet, 1:250,000.

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