Rhyolite

The Rhyolite 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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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Rhyolite

Commodity

Primary: Gold

Location

State: Alaska
District: Fairbanks

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Supergene alteration is attributed to weathering. Hydrothermal alteration includes pervasive cross-cutting sericitic and silicic alteration and stockworks of quartz-sericite-sulfide veins spatially associated with megascopic and smaller scale, pre-existing brittle structures (Rogers and others, 1998).

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Gold

Comments

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Rogers and others, 1998

Comment (Workings): Workings / Exploration = From 1990 to 1992, American Copper and Nickel Co. collected soil samples, conducted an IP/resistivity geophysical survey, and drilled four core holes (Rogers and others, 1998). Placer Dome Exploration, Inc., drilled the Rhyolite prospect in 1998.

Comment (Deposit): Model Name = Schist-hosted gold-quartz vein

Comment (Geology): Geologic Description = The Rhyolite prospect occurs in Fairbanks Schist and is associated with a mafic sill cut by two megascopic faults (Rogers and others, 1998). The Fairbanks Schist in the area is composed of quartz-muscovite schist, quartzite, and chlorite-quartz schist (Newberry and others, 1996). Soil samples collected from 1990 to 1992 contain gold values in excess of 100 ppb gold. In 1998, drilling by Placer Dome Exploration, Inc., encountered gold intercepts as high as 2.66 ounces of gold per ton over 19.7 feet (Szumigala and Swainbank, 1999, p. 9). The high-grade gold mineralization is associated with a flat-lying fault (Rogers and others, 1998).

References

Reference (Deposit): Rogers, J.A., McCoy, D. T., Nerup, M., Yuengling, K., Bean, K., Cameron, C., Grahm, G., Frantz, P., and Athey, J., 1998, Placer Dome-Silverado lease, 1998 annual report for Ester Dome: 68 p. (Report held by Range Minerals, Inc., North Pole, AK 99705.)

Reference (Deposit): Newberry, R.J., Bundtzen, T.K., Clautice, K.C., Combellick, R.A., Douglas, T., Laird, G.M., Liss, S.A., Pinney, D.S., Reifenstuhl, R.R., and Solie, D.N., 1996, Preliminary geologic map of the Fairbanks mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File 96-16, 17 p., 2 sheets, scale 1:63,360.

Reference (Deposit): Szumigala, D.J., and Swainbank, R.C., 1999, Alaska's mineral industry 1998: Alaska Division of Geological and Geophysical Surveys Special Report SR 53, 71 p.

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