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Emma

Past Producer in Alaska, United States with commodities Gold, Antimony, 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. Materials information
  7. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10002907
MRDS ID A015396
Record type Site
Current site name Emma
Alternate or previous names Overgard, Kathrine

Geographic coordinates

Geographic coordinates: -147.44685, 65.05079 (WGS84)
Relative position Cobb (1972, MF-413), loc. 35; NE1/4 sec. 36, T. 3 N., R 1 E., of the Fairbanks Meridian. This mine is on the east side of Willow Creek, near its head, at an elevation of 2,100 feet; it is about 1/4 mile northwest of Cleary Summit along the Steese Highway. Accuracy is within 1,000 feet.

Site location context

Political divisions (FIPS codes)

Fairbanks North Star(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Livengood A-1(quadrangle 1:63,360 scale)

Circle SW(quadrangle 1:100,000 scale)

Livengood(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Critical Secondary
Zinc Critical Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Gold Ore
Pyrite Ore
Sphalerite Ore
Stibnite Ore

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) PzPxyqs
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = By 1909, a 40 foot shaft had been sunk on the prospect and a northeast striking, steeply southeast dipping quartz-bearing shear zone was exposed. The higher grade portion of the shear was 2 to 16 inches wide and contained gold, stibnite, arsenopyrite, pyrite and minor sphalerite (Prindle, 1910). The schist host rock is strongly brecciated and cemented by quartz. By 1912, the shaft had been sunk to a depth of 60 feet with short drifts at the 60-foot level (Smith, 1913; B 525). The shear is hosted in part by mafic metavolcanic rocks and exhibits considerable offset by faulting. The shear dips steeply to the south at the surface but flattens to 45 degrees at depth. Ten tons of ore from this prospect were milled in Fairbanks and contained $38 per ton in gold (1.8 ounces of gold per ton). Chapin (1914) reported that in 1913 the drifts at the 60-foot level were 30 feet and 70 feet long to the east and west, respectively. An adit was being driven from the Willow Creek basin to allow
  • Geologic Description = exploration and development to proceed. A minor amount of exploration was completed on the prospect in 1914 (Eakin, 1915). A small amount of production was recorded from the prospect in 1917 however no tonnage or grade information is available (Martin, 1919). The prospect was idle until 1924 when it was re-opened, however, it was abandoned shortly afterwards and was idle when visited in 1931 (Hill, 1933).

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Fairbanks

Comments on the production information

  • Production Notes = Ten tons of ore from this prospect were milled in Fairbanks and contained $38 per ton in gold (1.8 ounces of gold per ton) (Smith, 1913; B 525). A small amount of production was recorded from the prospect in 1917 however no tonnage or grade information is available (Martin, 1919).

Comments on the workings information

  • Workings / Exploration = By 1910, the vein was exposed by a 40 foot shaft (Prindle, 1910). Chapin (1914) reported a 60 foot inclined shaft and 100 feet of drifts.

Reference information

Bibliographic references

Comments on the references

  • Primary Reference = Cobb, 1976 (OFR 76-633)

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).

Reporter information

Type Date Name Affiliation Comment
Reporter 04-MAY-1999 C.J. Freeman Avalon Development Corporation
Reporter 04-MAY-1999 J.R. Guidetti Schaefer Avalon Development Corporation

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.