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  3. Mineral Resource Data System (MRDS)

Iron Cap

Unknown in Alaska, United States with commodities Silver, Lead, Zinc
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Mineral occurrence model information
  7. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Links to other databases
  12. Bibliographic references
  13. General comments
  14. Reporter information

Geologic information

Identification information

Deposit ID 10003618
MRDS ID A106375
Record type Site
Current site name Iron Cap

Geographic coordinates

Geographic coordinates: -130.2137, 56.07477 (WGS84)
Relative position SEE LOCATION COMMENTS

Site location context

Political divisions (FIPS codes)

Prince of Wales-Hyder(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bradfield Canal A-1(quadrangle 1:63,360 scale)

Bradfield Canal SE(quadrangle 1:100,000 scale)

Bradfield Canal(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Southern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Tongass National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State
United States Alaska

Comments on the location information

  • 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.

Commodities

Commodity Importance
Silver Primary
Lead Primary
Zinc Critical Primary

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -130.2137, 56.07477
ListMap

Economic information

Ore body information

  • General form SEE DEPOSIT DESCRIPTION COMMENTS

Comments on the geologic information

  • 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).

Economic information about the deposit and operations

Commodity type Metallic
Significant No

Mining district

District name Hyder

Comments on the workings information

  • 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.

Reference information

Bibliographic references

  • 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.

  • 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."

  • 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.

  • 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.

General comments

Subject category Comment text
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.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1998 Berg, H. C. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.