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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Unnamed On Butterworth Island MRDS details
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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