Democrat Lode

Site Name

Primary: Democrat Lode
Secondary: John Mitchell Lode

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Commodity

Primary: Gold
Secondary: Silver
Secondary: Antimony

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Location

State: Alaska
District: Fairbanks

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Areas of the rhyolite at the Democrat Lode exhibit several types of alteration. The lode contains fractures filled with gossanized quartz veins with voids and localized sericite. McCoy and others (1997) describe several stages of alteration at the Democrat Lode. An early stage of alteration consists of quartz-tourmaline-muscovite +/- biotite +/- K-spar +/- clinozoisite. The stage more commonly associated with gold is an assemblage of quartz-white mica +/- ankerite +/- carbonaceous material. Albite is present in veins with quartz (R.J. Newberry, oral communication, 1998). The surrounding gneiss displays evidence of hornfelsing (K. Ausburn, oral communication, 1998).

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Arsenopyrite
Ore: Gold
Ore: Pyrite
Ore: Stibnite
Gangue: Ankerite
Gangue: Muscovite
Gangue: Quartz

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Comments

Comment (Workings): Workings / Exploration = Gold was first discovered in the Richardson area in 1905. Placer mines began operating in several streams in the immediate area. These include Tenderfoot Creek, Banner Creek, Buckeye Creek, and Democrat Pup. After peak gold production in 1908, mining in the area declined. In 1913, B.E. Shuff discovered gold at the Democrat Lode. Subsequently, a 93-foot adit was driven through a vein-rich zone. An ore processing mill was built in 1921, but there are no records of production (Olson and others, 1985). In 1989, a crushing and trommel sluicing operation took place. Further exploration activities have occurred on and around the lode in recent years. These include geochemical, geological, biochemical, and geophysical sampling and analysis (F.L. Blystone, written communication, 1994). In 1998, a 100,000 ton bulk sample was collected from an open cut at the Democrat Lode. The sample will be processed in Fairbanks, Alaska, to assess the total amount and recoverability of gold from the rhyolite (F.L. Blystone, written communication, 1998).

Comment (Exploration): Status = Active?

Comment (Geology): Age = Veins cut Cretaceous rhyolite intrusion

Comment (Deposit): Model Name = Plutonic-related mesothermal

Comment (Reference): Primary Reference = Bundtzen and Reger, 1977

Comment (Reserve-Resource): Reserves = F.L. Blystone (press release, 1994) has estimated a resource of 1,000,000 +/- 200,000 ounces of gold at the lode and surrounding areas.

Comment (Geology): Geologic Description = Reger, 1977).? Gold was first discovered in the Richardson district in 1905. Placer mines began operating in several streams in the immediate area. These include Tenderfoot Creek (BD039), Banner Creek, Buckeye Creek (BD005), and Democrat Pup Creek (BD013). After peak gold production in 1908, mining in the area declined. In 1913, B.E. Shuff discovered gold at the Democrat Lode. Subsequently, a 93-foot adit was driven through a veined zone. An ore processing mill was built in 1921, but there are no records of actual production (Olson and others, 1985). Further exploration activities have occurred on and around the lode in recent years. These include geochemical, geological, biochemical, and geophysical sampling and analysis (F.L. Blystone, written communication, 1994). In 1998, a 100,000 ton bulk sample was collected from an open cut at the Democrat Lode. The sample will be processed in Fairbanks, Alaska, to assess the total amount and recoverability of gold from the rhyolite (F.L. Blystone, written communication, 1998). Results are currently not available.? From 1905 through 1921, production in the Richardson district was approximately 95,000 ounces of gold and 24,000 ounces of silver (Bundtzen and Reger, 1977). Since 1980, the district has produced approximately 10,000 additional ounces of gold from intermittent mining (Olson and others, 1985). However, information regarding individual mine production in the Richardson district is not available. In 1989, a sluicing operation took place at the Democrat Lode. During the operations, approximately 3,000 ounces of gold and 450 ounces of silver were recovered (F.L. Blystone, press release, 1998). F.L. Blystone (press release, 1994) has estimated a resource of 1,000,000 +/- 200,000 ounces of gold at the lode and surrounding areas.

Comment (Production): Production Notes = From 1905 through 1921, production in the Richardson district was approximately 95,000 ounces of gold and 24,000 ounces of silver (Bundtzen and Reger, 1977). Since 1980, mining in the district has produced an additional 10,000 ounces of gold (Olson and others, 1985). However, information regarding individual mine production in the Richardson district is not available. During the 1989 sluicing operations at the Democrat Lode, approximately 3,000 ounces of gold and 450 ounces of silver were recovered (F.L. Blystone, written communication, 1998).

Comment (Geology): Geologic Description = The Richardson area is characterized by gentle slopes and broad, alluvium-filled valleys (Prindle and Katz, 1913, p. 140). The area is unglaciated and largely overlain by windblown silt, sand, and loess, locally up to 50 meters thick (Foster and others, 1979). The bedrock in the region comprises greenschist to amphibolite facies schist, marble, and gneiss that have been intruded by various igneous bodies (Bundtzen and Reger, 1977, p. 29). The schist and marble are probably Paleozoic, and the gneiss has a probable protolith of Precambrian and Paleozoic sedimentary and igneous rocks (Weber and others, 1978). The intrusive bodies in the area range in composition from rhyolite to andesite. Fine-grained rhyolite containing quartz and feldspar phenocrysts is common throughout the area (Olson and others, 1985). At the Democrat Lode, the rhyolite contains arsenopyrite, gold, and pyrite, and is albitic, clay, and sericite altered (R.J. Newberry, oral communication, 1998). Structurally, the Richardson region is cut by a northwest-trending fracture system termed the Richardson Lineament. The lineament appears to correspond to the distribution of the rhyolite and other intrusive bodies and placer gold deposits (Bundtzen and Reger, 1977, p. 29). Also, the lineament tends to separate gneissic rocks to the northeast from schistose rocks to the southwest (Swainbank and others, 1984). ? the Democrat Lode is located on a section of the lineament termed the Democrat dike. The deposit is primarily hosted in rhyolite consisting of quartz, plagioclase, and K-spar phenocrysts in an aphanitic groundmass. Quartz stringers, locally containing sulfides are present (Olson and others, 1985). The lode contains fractures filled with gossanized quartz veins with voids and localized sericite. McCoy and others (1997) describe several stages of alteration at the Democrat Lode. An early stage of alteration consists of quartz-tourmaline-muscovite +/- biotite +/- K-spar +/- clinozoisite. The stage more commonly associated with gold is an assemblage of quartz-white mica +/- ankerite +/- carbonaceous material. Locally, the plagioclase and K-spar phenocrysts are weathered to montmorillonite and kaolinite, respectively (D.J. Szumigala, oral communication, 1998). Albite is present in veins with quartz (R.J. Newberry, oral communication, 1998). In addition, the surrounding gneiss displays evidence of hornfelsing (K. Ausburn, oral communication, 1998). Mineralization in the rhyolite includes arsenopyrite, gold, pyrite, and stibnite (McCoy and others, 1997). An assay of a gossanized rock chip sample collected from the portal of an adit at the Democrat Lode contained 0.32 ppm Au, 7.5 ppm Ag, 58 ppm Cu, 137 ppm Pb, 21 ppm Zn, 6 ppm Mo, 150 ppm Sb, 20.5 ppm U, and 22.5 ppm Th (Bundtzen and Reger, 1977). Metz and Hawkins (1981) reported the average gold fineness to be 928. K-spar from the rhyolite yielded a K-Ar minimum age of 86.9 +/- 2.6 Ma (Bundtzen and

Comment (Commodity): Gangue = carbonate

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References

Reference (Deposit): Chapin, Theodore, 1914, Placer mining in the Yukon-Tanana region: U.S. Geological Survey Bulletin 592-J, p. 357-362.

Reference (Deposit): Bundtzen, T.K., and Reger, R.D., 1977, The Richardson lineament-a structural control for gold deposits in the Richardson mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 55, 46 p.

Reference (Deposit): Olson, B.G., Burton, J., Wolff, E.N., and Swainbank, R.D., 1985, Mining and minerals in the golden heart of Alaska: Fairbanks North Star Borough Publication, 80 p.

Reference (Deposit): Prindle, L.M., and Katz, F.J., 1913, Detailed description of the Fairbanks district, in Prindle, L. M., A geologic reconnaissance of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Bulletin 525, p. 59-152.

Reference (Deposit): Ellsworth, C.E., and Parker, G.L., 1911, Placer mining in the Yukon-Tanana region: U.S. Geological Survey Bulletin 480, 325 p.

Reference (Deposit): Metz, P.A., and Hawkins, D.B., 1981, A summary of gold fineness values from Alaska placer deposits: University of Alaska, Fairbanks, Mineral Industry Research Laboratory Report No. 45, 63 p.

Reference (Deposit): Swainbank, R.C., Burton, J.P., and Metz, P.A., 1984, Bedrock geology of the Richardson mining district, Alaska: University of Alaska, Mineral Industry Research Laboratory Open-File Report 84-2, 60 p., 8 maps, scale 1:40,000.

Reference (Deposit): Saunders, R.H., 1965, A geochemical investigation in the Richardson area, Big Delta quadrangle, Alaska: Alaska Division of Mines and Minerals Geochemical Report 3, 11 p.

Reference (Deposit): Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 map, scale 1:1,000,000.

Reference (Deposit): Cobb, E.H., and Eberlein, G.D., 1980, Summaries of data on and lists of references to metallic and selected nonmetallic mineral deposits in the Big Delta and Tanacross quadrangles, Alaska: U.S. Geological Survey Open-File Report 80-1086, 77 p.

Reference (Deposit): Menzie, W.D., and Foster, H.L., 1979, Metalliferous and selected nonmetalliferous mineral resource potential in the Big Delta quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-529D, 61 p., 1 sheet, scale 1:250,000.

Reference (Deposit): Weber, F.R., Foster, H.L., Keith, T.E.C., Dusel-Bacon, C., 1978, Preliminary geologic map of the Big Delta quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-529A, 1 sheet, scale 1:250,000.

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