The Porcupine 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
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Porcupine Creek Placer MRDS details
Site Name
Primary: Porcupine Creek Placer
Commodity
Primary: Gold
Secondary: Silver
Tertiary: Copper
Tertiary: Zinc
Tertiary: Lead
Location
State: Alaska
District: Juneau/Porcupine
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Year First Production: 1898
Year Last Production: 1985
Discovery Year: 1898
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
Name: Diorite
Role: Host
Age Type: Host Rock
Age Young: Holocene
Analytical Data
Not available
Materials
Ore: Chalcopyrite
Ore: Sphalerite
Ore: Galena
Gangue: Garnet
Gangue: Scheelite
Comments
Comment (Commodity): PLACER GOLD FINENESS: 841-909, 866 AVG.; USBM OF 89-86, P. 15
Comment (Deposit): ABANDONED CHANNEL AND BENCH DEPOSITS ARE HIGHEST GRADE-152,000 CY GRADING 0.0106 OZ/CY AU OR MORE. STREAM CHANNEL GRAVELS-500,000 CY, MEDIUM GRADE. ALLUVIAL FAN-6,000,000 CY.
Comment (Location): USGS MF-424, LOCATION 26; PLACER DEPOSIT EXTENDS FROM MOUTH OF PORCUPINE CREEK IN KLEHINI RIVER TO APPROXIMATELY 3 MILES UPSTREAM JUST ABOVE JUNCTION WITH MCKINLEY CREEK LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).
Comment (Production): TOTAL PRODUCTION 1898-1985 FOR PORCUPINE, CAHOON, AND MCKINELY CREEKS: 79,000 TROY OZ. PLACER GOLD
Comment (Development): DISCOVERED IN 1898, MINED EXTENSIVELY FROM 1898-1917, INTERMITTENTLY SINCE THEN.
Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.
Comment (Deposit): STREAM GRADIENT 350 FT/MI. TOTAL OF 652,000 CY MEDIUM TO HIGH POTENTIAL STREAM, ABANDONED CHANNEL AND BENCH GRAVELS. ALSO 6,000,000 CY OF UNKNOWN (PROBABLY LOW GRADE) ALLUVIAL FAN GRAVELS. LARGEST PLACER DEPOSIT IN SE ALASKA. ; INFO.SRC : 1 PUB LIT
Comment (Workings): SEVERAL FLUMES AND TUNNELS BUILT IN EARLY 1900'S TO DIVERT CREEK, SUPPLY WATER FOR HYDRAULIC METHODS. HAND METHODS, SLUICES, ROCKERS, TROLLEY LIFT USED IN EARLY 1900'S. RESURGENCE OF ACTIVITY IN 1970'S AND 1980'S SAW USE OF MECHANIZED PLACER METHODS, PAN METHODS.
Comment (Geology): LARGE DIORITE BOULDERS PRESENT, MODERATE TO WELL SORTED SAND AND GRAVEL BENCH ALLUVIUM; UNCONSOLIDATED SILT, SAND, AND GRAVEL STREAM ALLUVIUM; UNSORTED GLACIAL DRIFT. ; MAJOR.UNITS: M-L PAL PORCUPINE LIMESTONE OR MARBLE; MISS-PENN PORCUPINE SLATE; TERT VOLCANIC INTRUSIONS. ; REG.COM: SOURCE OF PORCUPINE CREEK PLACER GOLD IS BELIEVED TO BE MCKINLEY CREEK, AS LITTLE GOLD IS FOUND ABOVE JUNCTION OF PORCUPINE AND MCKINLEY CREEKS. PYRITIFEROUS ZONES IN PORCUPINE SLATE CONTAIN 1-2 PPM GOLD (USBM OF 89-86, P. 15). SAMPLES TAKEN NEAR THE HEAD OF PORCUPINE CREEK YIELD 0.148 PPM GOLD IN SLATE HOSTED QUARTZ VEINS, AND 49 PPM GOLD IN ISOLATED SAMPLE OF CHALCOPYRITE-BEARING QUARTZ FLOAT (USBM OF 173-84, P. 3, SAMPLES 132-141)
References
Reference (Deposit): USGS MF-424, LOCATION 26 (1972)
Reference (Deposit): USBM OF 89-86 (1986)
Reference (Deposit): USGS OF 78-316, P. 102, 103 (1978)
Reference (Deposit): USBM OF 173-84, P. 3, SAMPLES 132-141 (1984)
Reference (Deposit): USGS P 832, P. 20, 21 (1974)
Reference (Deposit): USGS OF 406, P. 6 (1970)
Reference (Deposit): USGS P. 610, P. 22 (1968)
Reference (Other Database): BAG-MF-424-26
Reference (Production): USBM OF 89-86, P. 6, TABLE 1
The Top Ten Gold Producing States
These ten states contributed the most to the gold production that built the West from 1848 through the 1930s. The Top Ten Gold Producing States.
