Engineer

Occurrence in Alaska, United States with commodities Silver, Gold, Copper, Lead, Tungsten

Geologic information

Identification information

Deposit ID 10000199
MRDS ID A010237
Record type Site
Current site name Engineer

Geographic coordinates

Geographic coordinates: -130.21954, 56.04366 (WGS84)
Relative position SEE LOCATION COMMENTS
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Geographic areas

Country State
United States Alaska

Comments on the location information

  • THE ENGINEER PROSPECT IS IN SECTION 23 AT AN ELEVATION OF ABOUT 3750 FEET ON A WEST-FACING MOUNTAINSIDE OVERLOOKING LOWER FERGUSON GLACIER (ELLIOTT AND KOCH, 1981, P. 13, LOC. 42). THIS LOCATION IS PROBABLY ACCURATE WITHIN ABOUT A QUARTER OF A MILE.

Commodities

Commodity Importance
Silver Primary
Gold Primary
Copper Primary
Lead Primary
Tungsten Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Scheelite Ore
Pyrite Gangue
Quartz Gangue

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Texas Creek
    Rock description Texas Creek

Nearby scientific data

(1) -130.21954, 56.04366

Comments on the geologic information

  • LEAD-ISOTOPE STUDIES OF GALENA FROM THE ENGINEER PROSPECT (MAAS AND OTHERS, 1995, P. 229-248) INDICATE THAT THE DEPOSIT IS EOCENE IN AGE, CONTEMPORANEOUS WITH EMPLACEMENT OF THE HYDER QUARTZ MONZONITE.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic
Significant No

Comments on exploration

  • Status = Inactive

Mining district

District name Hyder

Comments on the workings information

  • PROSPECT WAS EXPLORED, PROBABLY IN THE 1920'S, BY A 30-FOOT ADIT AND SEVERAL OPENCUTS. EARLY ASSAYS OF SEVEN SPECIMENS FROM SULFIDE-RICH MASSES SHOWED 0.04-0.64 OZ AU AND 7.6-26 OZ AG PER TON, AND 11.3-55.3% PB.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A010237
USGS Alaska Resource Data File ARDF BC042
USGS Mineral Resources Data System MRDS D002758

Bibliographic references

  • Deposit

    Buddington, A.F., 1929, Geology of Hyder and vicinity, southeastern Alaska, with a reconnaissance of Chickamin River: U.S. Geological Survey Bulletin 807, 124 p."

  • 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

    Elliott, R.L., and Koch, R. D., 1981, Mines, prospects, and selected metalliferous mineral occurrences in the Bradfield Canal quadrangle, Alaska: U.S. Geological Survey Open-File Report 81-728-B, 23 p., 1 sheet, scales 1:250,000 and 1:63,360.

  • 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.

  • Deposit

    Byers, F. M., and Sainsbury, C. L., 1956, Tungsten depositsof the Hyder district, Alaska: U.S. Geological Survey Bulletin 1024-F, p. 123-140.

General comments

Subject category Comment text
Deposit THE COUNTRY ROCKS IN THE AREA OF THE ENGINEER PROSPECT ARE PELITIC METASEDIMENTARY AND SUBORDINATE ANDESITIC METAVOLCANIC STRATA OF THE JURASSIC OR OLDER MESOZOIC HAZELTON GROUP, WHICH IS UNDERLAIN AND LOCALLY INTRUDED BY THE TRIASSIC TEXAS CREEK GRANODIORITE; AND THE EOCENE HYDER QUARTZ MONZONITE, WHICH INTRUDES THE HAZELTON AND TEXAS CREEK ROCKS (SMITH, 1977; KOCH, 1996). THE DEPOSIT (BUDDINGTON, 1929, P. 109-110) CONSISTS OF A QUARTZ FISSURE VEIN 1-4.5 FEET (GENERALLY 2-4 FEET) THICK HOSTED BY TEXAS CREEK GRANODIORITE NEAR ITS CONTACT WITH HAZELTON ARGILLITE AND GRAYWACKE. THE VEIN LOCALLY CONTAINS MASSES OF CHALCOPYRITE, PYRITE, AND GALENA, AND RARE GRAINS OF SCHEELITE. ASSAYS OF SEVEN SPECIMENS FROM THE SULFIDE-RICH MASSES SHOWED 0.04-0.64 OZ AU AND 7.6-26 OZ AG PER TON, AND 11.3-55.3% PB. LEAD-ISOTOPE STUDIES OF GALENA FROM THE ENGINEER PROSPECT (MAAS AND OTHERS, 1995, P. 229-248) INDICATE THAT THE DEPOSIT IS EOCENE IN AGE, CONTEMPORANEOUS WITH EMPLACEMENT OF THE HYDER
Deposit QUARTZ MONZONITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-1983 Hirschmann, M. M. (Elliott, R. L.) U.S. Geological Survey
Updater 01-MAY-1998 Berg, H. C. U.S. Geological Survey