Cobol Pinta Bay Gold Mine

Site Name

Primary: Cobol Pinta Bay Gold Mine
Secondary: Cox
Secondary: Bolyan and Loberg Mine
Secondary: Pinta Bay Mining Co.
Secondary: Cobol-Mine Mountain Mine

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Commodity

Primary: Gold
Tertiary: Zinc
Tertiary: Lead
Tertiary: Copper

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Location

State: Alaska
District: Chichagof

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Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

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Holdings

Not available

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Workings

Type: Surface/Underground

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Year First Production: 1933
Year Last Production: 1935
Discovery Year: 1921
Years of Production:
Organization:
Significant: N
Deposit Size: S

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Not available

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Analytical Data

Analytical Data: SAMPLES IN STOPED PORTION OF VEIN NO. 1 RANGED FROM 0-2.45 OZ/TON AU-USGS MF-1476-B, P. 8.

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Materials

Ore: Galena
Ore: Sphalerite
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Dolomite
Gangue: Pyrite
Gangue: Pyrrhotite

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Comments

Comment (Workings): VEIN NO. 1: 70 FT. LONG AND 40 FT. HIGH STOPE, AND 200 FT. OF SURFACE TRENCHES. VEIN NO. 2: 28 FT. CROSSCUT TUNNEL, 40 FT. OF SURFACE TRENCHES. 5 MI. LONG RAILROAD TRAMWAY, SAWMILL, TRACTORS, AND GIBSON MILL ALSO INSTALLED. MILL AND MACHINERY REMOVED 1936, RAILROAD IN DISREPAIR AS OF 1941.

Comment (Geology): CRET-JUR DIORITE NEAR CONTACT WITH PAL GREENSTONE, CHERTY QUARTZITE, SILICEOUS LIMESTONE.

Comment (Location): USGS MF-467, LOC. 11; USGS B 1058-E, PLATE 12. LOCATION IS TUNNEL IN VEIN NO. 1. USGS MF-1476-B IS BEST LOCATION. LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).

Comment (Development): 9 CLAIMS LOCATED IN 1921 BY PINTA BAY MINING CO. TUNNEL AND RAILROAD-TRAMWAY BUILT IN 1923. MILL INSTALLED IN 1933 AND OPERATED THROUGH 1935. MILL AND EQUIPMENT REMOVED IN 1936.

Comment (Deposit): DEPOSIT CONSISTS OF TWO MAIN QUARTZ VEINS. VEIN NO. 1 IS 6-18 IN WIDE, AVERAGING 10-14 IN. WIDE IN TUNNEL, AND IS TRACED ON SURFACE OVER 200 FT. LONG, WITH VERTICAL DISTANCE OF 50 FT. VEIN IS IN ALBITIZED DIORITE AND GREENSTONE, AND CONSISTS OF MILKY-WHITE QUARTZ, A LITTLE DOLOMITE, ARSENOPYRITE, SPHALERITE, GALENA, FREE GOLD, AND A LITTLE PYRITE AND CHALCOPYRITE. CLAY GOUGE 1-1 1/2 IN WIDE BETWEEN VEIN AND HANGING WALL CARRIES FREE GOLD. 4 FT. OF ALTERED GREENSTONE AT ENTRANCE OF TUNNEL CARRIES VEINLETS OF QUARTZ, PYRRHOTITE, AND CHALCOPYRITE. VEIN NO. 2 LIES 300 FT. SW, AND IS QUARTZ FISSURE VEIN CUTTING ACROSS GREENSTONE, CHERTY QUARTZITE, AND SILICEOUS LIMESTONE AT ANGLE TO BEDDING. VEIN EXPOSED AT SURFACE FOR LENGTH OF 40 FT., AND IS 6-8 IN. WIDE AT SURFACE, 1 FT. WIDE IN TUNNEL. VEIN CONSISTS OF QUARTZ, SPHALERITE, GALENA, FREE GOLD, AND TRACE OF PYRITE.

Comment (Deposit): 24 CLAIMS LISTED AS ACTIVE THROUGH 1974, ACCORDING TO USBM OFR 20-73. ; INFO.SRC : 1 PUB LIT

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References

Reference (Deposit): USGS MF-1476-B, LOC. 8, P. 8 (1982)

Reference (Deposit): USGS B 773, P. 121-123 (1925)

Reference (Deposit): USGS B 929, P. 142-143 (1941)

Reference (Deposit): USGS B 1058-E, P. 209-210, PLATE 12 (1959)

Reference (Deposit): USGS OF 78-450, P. 33-34 (1978)

Reference (Deposit): USGS MF-467, LOC. 11 (1972)

Reference (Other Database): BAG-MF-1476-B-8

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