Emma

The Emma is a gold 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

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Site Name

Primary: Emma
Secondary: Overgard
Secondary: Kathrine

Commodity

Primary: Gold
Secondary: Zinc
Secondary: Antimony

Location

State: Alaska
District: Fairbanks

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Gold
Ore: Pyrite
Ore: Sphalerite
Ore: Stibnite

Comments

Comment (Workings): 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.

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

Comment (Geology): 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).

Comment (Production): 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).

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

Comment (Geology): 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

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Chapin, Theodore, 1914, Lode mining near Fairbanks, Alaska: U.S. Geological Survey Bulletin 592-J, p. 321-355.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the Livengood quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-413, 2 sheets, scale 1:250,000.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Livengood quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-819, 241 p.

Reference (Deposit): Prindle, L.M., 1910, Auriferous quartz veins in the Fairbanks district: U.S. Geological Survey Bulletin 442-F, p. 210-229.

Reference (Deposit): Freeman, C.J., 1992, 1991 Golden Summit project final report, volume 2: Historical summary of lode mines and prospects in the Golden Summit project area, Alaska: Avalon Development Corp., 159 p. (Report held by Freegold Recovery Inc. USA, Vancouver, British Columbia.)

Reference (Deposit): Chapin, Theodore, 1919, Mining in the Fairbanks district: U.S. Geological Survey Bulletin 692-F, p. 321-327.

Reference (Deposit): Eakin, H.M., 1915, Placer mining in Seward Peninsula: U.S. Geological Survey Bulletin 622-I, p. 366-373.

Reference (Deposit): Smith, P.S., 1913, Lode mining near Fairbanks, in Prindle, L.M., A geologic reconnaissance of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Bulletin 525, p. 153-216.

Reference (Deposit): Smith, P.S., 1913, Lode mining near Fairbanks: U.S. Geological Survey Bulletin 542-F, p. 137-202.

Reference (Deposit): Hill, J.M., 1933, Lode deposits of the Fairbanks District, Alaska: U.S. Geological Survey Bulletin 849-B, p. 29-163.

Reference (Deposit): Chapman, R.M., and Foster, R.L., 1969, Lode mines and prospects in the Fairbanks district, Alaska: U.S. Geological Survey Professional Paper 625-D, 25 p., 1 plate.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-633, 72 p.

Reference (Deposit): Martin, G.C., 1919, Alaska Mining Industry in 1917: U.S. Geological Survey Bulletin 692, p. 11-42

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