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Tibbit

Prospect in Alaska, United States with commodities Copper, Zinc, Silver, Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Nearby scientific data
  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 10307356
Record type Site
Current site name Tibbit

Geographic coordinates

Geographic coordinates: -146.56654, 60.87259 (WGS84)
Relative position The Tibbit prospect is at an elevation of about 1600 ft., approximately 0.75 mi. northeast of Copper Mountain. It is in S1/2 sec. 36, T. 11 S., R. 8 W., of the Copper River Meridian. The location is accurate to within 1000 ft. This prospect is shown as #11 in Cobb (1972: MF-392) and as C-81 in Jansons and others (1984).

Site location context

Political divisions (FIPS codes)

Valdez-Cordova(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cordova D-7(quadrangle 1:63,360 scale)

Cordova NW(quadrangle 1:100,000 scale)

Cordova(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Eastern Prince William Sound(hydrologic unit)

Prince William Sound(hydrologic accounting unit)

South Central Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Chugach 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

Commodities

Commodity Importance
Copper Primary
Zinc Critical Primary
Silver Secondary
Gold Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore
Pyrrhotite Ore

Mineral occurrence model information

Model code 90
USGS model code 24a
Deposit model name Massive sulfide, Cyprus
Mark3 model number 11

Nearby scientific data

(1) -146.56654, 60.87259
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rocks at this prospect are mafic volcanic rocks and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). The deposit consists of chalcopyrite, pyrite, and pyrrhotite in one- to eight- foot wide shear zones (Cobb, 1979: MF-392). Jansons and others (1984) report that two grab samples contained 0.59% and 2% Cu, and 1.8 ppm and 6.4 ppm Ag; two chip samples contained 430 ppm and 0.93% Cu, 240 ppm and 0.13% Zn, and 3.4 ppm and 12.7 ppm Ag. Cobb (1979: OFR 79-973) reported one assay value of 1.9 oz Au/ton.
  • Age = Probably Tertiary based on the age of the host rocks.

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name Copper River

Comments on the reserve resource information

  • Reserves = Inferred reserves of 500 tons @ 0.72% Cu.

Comments on the workings information

  • Workings / Exploration = The deposit was explored in the early 1900s by four adits and by open cuts (Cobb, 1979: MF-392). However, in the 1980s only one 20 ft. adit could be found (Jansons and others, 1984). Jansons and others (1984) report that two grab samples contained 0.59% and 2% Cu, and 1.8 ppm and 6.4 ppm Ag, and that two chip samples contained 430 ppm and 0.93% Cu, 240 ppm and 0.13% Zn, and 3.4 ppm and 12.7 ppm Ag. Cobb (1979: OFR 79-973) reported one assay value of 1.9 oz Au/ton.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Jansons and others, 1984

General comments

Subject category Comment text
Deposit Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Deposit Other Comments = Nelson and others (1985) interpret the country rocks as accreted ocean crust. Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.. Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-00 S.W. Nelson 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.