Iron Cap

The Iron Cap is a silver, lead, and zinc 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.

Site Name

Primary: Iron Cap

Commodity

Primary: Silver
Primary: Lead
Primary: Zinc

Location

State: Alaska
District: Hyder

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Unknown
Operation Type: Unknown
Years of Production:
Organization:
Significant: N

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Form: SEE DEPOSIT DESCRIPTION COMMENTS

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Not available

Comments

Comment (Location): THE IRON CAP PROSPECT (MAAS AND OTHERS, 1995, P. 233, 235, 245) IS IN SECTION 11 AT AN ELEVATION OF ABOUT 4700 FEET. IT IS ON A SOUTH-FACING MOUNTAINSIDE OVERLOOKING THE WEST FORK OF TEXAS CREEK, AND ABOUT 2.3 MILES NORTHEAST OF TEXAS LAKE. THE LOCATION IS ACCURATE WITHIN ABOUT 0.1 MILE.

Comment (Workings): DEPOSIT HAS BEEN EXPLORED BY A TRENCH. SAMPLES OF THE DEPOSIT COLLECTED BY THE U.S. BUREAU OF MINES IN 1992 OR 1993 (MAAS AND OTHERS, P. 245) CONTAIN UP TO 42.9 PPM AG, 7270 PPM PB, AND 4.76% ZN.

Comment (Deposit): THE COUNTRY ROCKS IN THE AREA OF THE IRON CAP PROSPECT ARE PELITIC METASEDIMENTARY AND SUBORDINATE ANDESITIC VOLCANIC STRATA OF THE JURASSIC OR OLDER MESOZOIC HAZELTON GROUP; THE TRIASSIC TEXAS CREEK GRANODIORITE, WHICH UNDERLIES AND LOCALLY INTRUDES THE TEXAS CREEK; AND THE EOCENE HYDER QUARTZ MONZONITE, WHICH INTRUDES THE HAZELTON AND TEXAS CREEK ROCKS (SMITH, 1977; KOCH, 1996). MAAS AND OTHERS (1995, P. 235,245) DESCRIBE THE DEPOSIT AS LENSES AND DISSEMINATIONS OF PYRITE, GALENA, AND SPHALERITE IN QUARTZ-CARBONATE LENSES IN HAZELTON ARGILLITE. LEAD-ISOTOPE STUDIES OF GALENA FROM THE PROSPECT (MAAS AND OTHERS, P. 235) INDICATE THAT THE DEPOSIT IS JURASSIC IN AGE, CONTEMPORANEOUS AT LEAST IN PART WITH ISLAND-ARC VOLCANISM IN HAZELTON TIME (ALLDRICK, 1993). SAMPLES OF THE DEPOSIT COLLECTED BY THE U.S. BUREAU OF MINES IN 1992 OR 1993 (MAAS AND OTHERS, 1995, P. 245) CONTAIN UP TO 42.9 PPM AG, 7270 PPM PB, AND 4.76% ZN.

Comment (Geology): MAAS AND OTHERS (1995, P. 235,245) DESCRIBE THE DEPOSIT AS LENSES AND DISSEMINATIONS OF PYRITE, GALENA, AND SPHALERITE IN QUARTZ-CARBONATE LENSES IN HAZELTON ARGILLITE. LEAD-ISOTOPE STUDIES OF GALENA FROM THE PROSPECT (MAAS AND OTHERS, P. 235) INDICATE THAT THE DEPOSIT IS JURASSIC IN AGE, CONTEMPORANEOUS AT LEAST IN PART WITH ISLAND-ARC VOLCANISM IN HAZELTON TIME (ALLDRICK, 1993).

References

Reference (Deposit): Alldrick, D. J., 1993, Geology and metallogeny of the Stewart mining camp, northwestern British Columbia: British Columbia Department of Mines and Petroleum Resources Bulletin no. 85, 105 p., 2 plates."

Reference (Deposit): Maas, K. M., Bittenbender, P. E., and Still, J. C., 1995, Mineral investigations in the Ketchikan mining district, southeastern Alaska: U. S. Bureau of Mines Open-File Report 11-95, 606 p.

Reference (Deposit): Koch, R. D., 1996, Reconnaissance geologic map of the Bradfield Canal quadrangle, southeastern Alaska: U.S. Geological Survey Open-File Report 81-728A, 35 p.,1 sheet, scale 1:250,000.

Reference (Deposit): Smith, J.G., 1977, Geology of the Ketchikan D1 and Bradfield Canal A-1 quadrangles, southeastern Alaska: U.S. Geological Survey Bulletin 1425, 49 p.

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