Portland Zinc-Lead-Copper-Silver-Gold Prospect

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

Satelite View

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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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