Unnamed On Butterworth Island

The Unnamed On Butterworth Island is a silver, lead, 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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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: Unnamed On Butterworth Island

Commodity

Primary: Silver
Primary: Lead
Primary: Zinc

Location

State: Alaska
District: Kupreanof

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Massive sulfide, kuroko

Orebody

Form: SEE DEPOSIT DESCRIPTION COMMENTS

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Not available

Comments

Comment (Workings): HAS BEEN KNOWN SINCE AT LEAST THE LATE 1970'S AND HAS BEEN EXAMINED AND SAMPLED BY A SUCCESSION OF COMPANIES. HOUSTON OIL AND MINERALS DOCUMENTED THEIR 1980 WORK AT THE SITE WITH THEIR ANNUAL REPORT OF ASSESSMENT ON THE CLAIMS THEY HELD ON THE DEPOSIT (BOOK 12, PAGES 687-738, RECORDER'S OFFICE, PETERSBURG RECORDING DISTRICT) BUT THERE IS LITTLE PUBLIC RECORD OF MORE RECENT WORK.

Comment (Production): NONE

Comment (Deposit): A PROSPECT KNOWN SINCE THE LATE 1970'S BUT NOT WELL DOCUMENTED. CONSISTS OF VOLCANOGENIC MASSIVE SULFIDE LAYERS IN TRIASSIC HYD GROUP ROCKS ANALOGOUS TO OTHER SIMILAR DEPOSITS IN THE DUNCAN-ZAREMBO MINERAL BELT AS DEFINED BY BERG AND GRYBECK (1980) AND BERG (1981). BREW (1997 [OF 97-156-J]) MAPS THE ROCKS IN THE VICINITY AS CRETACEOUS DIORITE AND MESOZOIC VOLCANIC ROCKS BUT RECENT MAPPING BY KARL (ORAL COMMUNICATION, 1998) INDICATES THAT AT LEAST SOME TRIASSIC HYD GROUP ROCKS ARE EXPOSED AT THE SOUTHEAST END OF BUTTERWORTH ISLAND.

Comment (Location): PROSPECT LONG KNOWN BUT NOT DESCRIBED IN THE LITERATURE; THE SITE CAN BE CONFIDENTLY LOCATED AT THE SOUTHEASTERN TIP OF BUTTERWORTH ISLAND IN THE CHANNEL BETWEEN WOEWODSKI ISLAND AND KUPREANOF ISLAND. THE DEPOSIT EXTENDS OUT INTO THE FLAT THAT UNCOVERS AT LOW TIDE BETWEEN BUTTERWORTH ISLAND THE THE SMALL UNNAMED ISLAND SOUTH OF IT. NEAR THE NORTHEAST CORNER OF SECTION 3, T. 62 S, R. 79 E. CALLED THE 'MAD DOG' OUTCROP BY HOUSTON OIL AND MINERALS IN 1980 (BOOK 12, PAGES 687-738, RECORDER'S OFFICE, PETERSBURG RECORDING DISTRICT).

Comment (Exploration): Status = Active?

References

Reference (Deposit): Berg, H. C., and Grybeck, Donald, 1980, Upper Triassic volcanogenic Zn-Pb-Ag (-Cu-Au) mineral deposits near Pertersburg, Alaska: U.S. Geological Survey Open-File Report 80-527, 11 p., 1 oversize sheet.

Reference (Deposit): Berg, H.C., 1981, Upper Triassic volcanogenic massive sulfide metallogenic province identified in southeastern Alaska, in Albert, N.R.D., and Hudson, T., eds, United States Geological Survey in Alaska: Accomplishments during 1979: U. S. Geological Survey Circular 823-B, p. B104-108.

Reference (Deposit): Brew, D.A., 1997, Reconnaissance geologic map of the Petersburg C-4 quadrangle, southeastern Alaska: U. S. Geological Survey Open-File Report 97-156-J, scale 63,360, one sheet, 21 p. pamphlet.

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