The Twelvemile Creek Placer 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
Satelite View
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.
Twelvemile Creek Placer MRDS details
Site Name
Primary: Twelvemile Creek Placer
Secondary: Forks of Twelvemile Creek
Secondary: Potato Creek
Commodity
Primary: Gold
Location
State: Alaska
District: Koyukuk District
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: GOLD FINENESS 914 (BENCH).
Materials
Ore: Gold
Comments
Comment (Location): LOCATION MIDWAY BETWEEN UPPER FORK AND LOWER FORK. EXTENT OF PLACER NOT CLEARLY KNOWN, PROBABLY WITHIN 3 MI UPSTREAM AND DOWNSTREAM FROM LOCATION ON MAIN AND TRIBUTARY CHANNELS
Comment (Development): EXPL.COM: DRIFTING, SLUICING, HYDRALIC MINING (1937) PROPERTY WAS ACTIVE 1900-09, INTERMITTANTLY TO 1935 AND IN 1937.
Comment (Deposit): BURIED PLACER APPARENTLY MINOR CONTRIBUTOR TO PRODUCTION. GRAVELSON HIGH BENCH ARE 6 TO 9 FT THICK WITH GOLD THROUGHOUT.
Comment (Geology): GEOL.COM: GEOLOGY DESCRIPTION OF HIGHEST BENCH PLACER OF TWO PRESENT. BOULDERS UP TO 2 FT IN DIAMETER, PREDOMMANTLY GREENSTONE, MINOR QTZ DIORITE, GNEISS. ; MAJOR.UNITS: BEDROCK IS GRAPHITE AND QUARTZITE SCHIST.
Comment (Production): MAIN HIGH BENCH YIELDED 75 CENTS PER CU YD. SOME RAN 35 CENTS PER SQ FT BEDROCK (1937).
References
Reference (Production): USGS BULL 532, P. 69.
Reference (Deposit): USGS OFR 76-340, P. 163.
Reference (Deposit): REED, 1938, ALASKA DEPT OF MINES UNPUBL REPT, P. 105-111.
Reference (Deposit): USGS BULL 532, P. 69, 85.
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