The Portland Zinc-Lead-Copper-Silver-Gold Prospect is a zinc, copper, and lead mine located in Alaska at an elevation of 174 feet.
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
Elevation: 174 Feet (53 Meters)
Commodity: Zinc, Copper, Lead
Lat, Long: 57.69111, -133.37556
Map: View on Google Maps
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Portland Zinc-Lead-Copper-Silver-Gold Prospect MRDS details
Site Name
Primary: Portland Zinc-Lead-Copper-Silver-Gold Prospect
Commodity
Primary: Zinc
Primary: Copper
Primary: Lead
Secondary: Silver
Tertiary: Gold
Location
State: Alaska
District: Petersburg
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.
Holdings
Not available
Workings
Type: Surface
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1889
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Form: LENS
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: ASSAYS OF CHIP SAMPLES SHOW 0.52% ZN, 0.40% CU, 0.23% PB, AND TRACES OF AU AND AG, ACCORDING TO ADGGS GR1, P. 16. 8 FT. SAMPLE FROM CROSSCUT CONTAINED 0.34% ZN, 0.18% PB, 0.093% CU, 10 PPM AG, 0.10 PPM AU, ACCORDING TO USGS B 1525, P. 187.
Materials
Ore: Chalcopyrite
Ore: Gold
Ore: Sphalerite
Gangue: Pyrite
Gangue: Quartz
Gangue: Muscovite
Gangue: Pyrrhotite
Comments
Comment (Workings): 3 ADITS DRIVEN NORMAL TO SCHIST AND PHYLLITE, CONSIST OF 305 FT. OF WORKINGS.
Comment (Deposit): NOT ECONOMICALLY WORKABLE ; INFO.SRC : 1 PUB LIT
Comment (Location): USGS B 1525, FIG. 71; USGS MF-425, LOC. 8 LAND STATUS VALUE CALCULATED 6-94 USING GIS OVERLAY ANALYSIS WITH BLM 1:2,500,000 SCALE OWNERSHIP STATUS MAP (1991).
Comment (Development): 7 CLAIMS LOCATED IN 1889, RELOCATED 1897. 3 ADITS DRIVEN BETWEEN 1890 AND 1910. NO PRODUCTION.
Comment (Deposit): SILICIFIED MUSCOVITE SCHIST AND PHYLLITE CONTAIN NUMEROUS QUARTZ STRINGERS AND LENSES PARALLEL TO SCHISTOSITY. PYRITE, PYRRHOTITE, AND TRACES OF GALENA, SPHALERITE, CHALCOPYRITE, AND GOLD OCCUR AS SPARSE DISSEMINATIONS AND OCCASIONAL THIN STRINGERS PARALLEL TO FOLIATION.
References
Reference (Deposit): USGS B 1525, P. 187-189, FIG. 71, PLATE 1, (1984)
Reference (Deposit): USGS OF 78-698, P. 22 (1978)
Reference (Deposit): ADMM (ADGGS) GR1, P. 15, 16 (1962)
Reference (Other Database): BAG-B-1525-FIG-71
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