Ryan Lode

The Ryan Lode 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: Ryan Lode

Commodity

Primary: Gold
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

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Text: A surface oxidation zone is present at both the Ryan and Curlew shears and varies in depth from 150 feet to more than 300 feet. There has been extensive sericitic alteration along shears and fractures within the quartz monzonite intrusion. At least three alteration assemblages have been identified: quartz-muscovite-siderite, quartz-muscovite-chlorite, and silicification (Ryan Lode Mines, Inc., unpublished report, 1996).

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Gold
Ore: Jamesonite
Ore: Stibnite

Comments

Comment (Production): Production Notes = The first shipment of ore was reported in 1911 (Brooks, 1912, p. 33). In 1938, Bartholomae Oil Co. cleaned out the old shaft and ore was taken out and milled (Smith, 1939 [B 917-A, p. 26]). There is no further production until the late 1980's when La Teko Resources mined approximately 320,000 tons of ore from a pit on the property from 1987 to 1989. This ore contained 19,220 ounces of gold and 14,330 ounces of silver (R. Hughes, written commun., 1996).

Comment (Reserve-Resource): Reserves = Based on a 0.015-ounce-per-ton cutoff grade, the total reserves in the Ryan Lode and the Curlew Shear are 822,200 ounces of gold in 14.6 million tons of rock. There is a total geologic resource of about 2.4 million ounces of gold (Swainbank and Szumigala, 2000, p. 4).

Comment (Geology): Geologic Description = The following is a summary of the Ryan Lode property prepared Ryan Lode Mines, Inc. (Ryan Lode Mines, Inc., unpublished report, 1996). The Ryan lode is underlain by the Fairbanks Schist that consists of quartz-mica schist, mica schist, and calcareous schist. A small quartz monzonite intrusion is located in the southeast portion of the property. Prior to the intrusion, the rocks underwent several episodes of regional deformation. Post-intrusive brittle deformation resulted in pervasive near-vertical faulting. The dominant structural trend on the property parallels the regional trend of about N. 45 E. The ore reserves occur in two shear zones: the Ryan shear and the Curlew shear, which is just south of the Ryan shear. Both deposits are shist-hosted and structurally controlled. However, the Curlew shear is partially in a small quartz monzonite intrusion. A surface oxidation zone is present at both sites and varies in depth from 150 feet to more than 300 feet. Quartz veins in the shear zones contain gold, arsenopyrite, and minor pyrite and stibnite. The Ryan shear is of varied thickness and has an average strike of N. 30 E. Where the the shear zone trends N. 35 E. to N. 55 E., secondary splays diverge from the main trunk at regular intervals along the shear. The dip of the Ryan shear varies between 50 and 80 degrees east. High-grade ore is found in pods which form at deflection points in the shear zone. As in the Ryan shear, the gold and sulfides in the Curlew shear are associated with quartz-filled voids in highly fractured rock. The intrusion (90 to 93 m.y. old) that hosts part of the Curlew shear appears to be sill-like, and in some places it is in fault contact with the surrounding schist. It has a core of quartz monzonite surrounded by a border of granodiorite to quartz diorite. There has been extensive sericitic alteration along shears and fractures within the intrusion. At least three alteration assemblages have been identified: quartz-muscovite-siderite, quartz-muscovite-chlorite, and silicification. White mica in the hydrothermal stockwork has been dated at 89.1 +/- 0.3 Ma (McCoy and others, 1997). Gold ore was discovered at the Ryan lode in the early 1900's; the first production was recorded in 1911(Brooks, 1912, p. 33). Work continued intermittently from 1911 to 1958. The gold varies from 814 to 834 fine (Glover, 1950). Between 1938 and 1942, more than 1,500 feet of shafts, 2,000 feet of drifts, adits and crosscuts, and more than 2,800 feet of trenching was completed (Warfield and Thomas, 1972). From 1987 to 1989, approximately 320,000 tons of ore were mined from an open pit (R. Hughes, written commun., 1996). In recent years, sampling of the Ryan and Curlew ore bodies has been accomplished by both reverse circulation and core drilling that began in 1990 and continued until 1993 (Ryan Lode Mines, Inc., unpublished report, 1996). From this drilling, a reserve of 8.27 million tons of material grading 0.077 ounce of gold per ton has been defined (Masterman and Campbell, 1993).

Comment (Deposit): Model Name = Schist-hosted gold-quartz vein

Comment (Workings): Workings / Exploration = Work was reported on the property as early as 1911(Brooks, 1912, p. 33). In 1913, a shaft was reported to be 90 feet deep (Smith, 1913 [B 525, p. 207]). By 1931, the workings consisted of shallow shafts and pits, a tunnel 300 feet long, and a shaft 200 feet deep (Hill, 1933, p. 135-138). In 1938, Bartholomae Oil Co. had control of the property and cleaned out the old shaft to a depth of 160 feet and drove 330 feet of drift and several hundred feet of crosscuts and raises (Smith, 1939 [B 917-A, p. 26]). In 1940, a large amount of development work was reported including trenching and geophysical work (Smith, 1942, p. 23). Between 1938 and 1942, more than 1,500 feet of shafts, 2,000 feet of drifts, adits and crosscuts, and more than 2,800 feet of trenching was completed (Warfield and Thomas, 1972). From 1954 to 1958, there was minor trenching and drlling (Warfield and Thomas, 1972). In 1969-70, the U.S. Bureau of Mines conducted a drilling program that was a pilot study to compare the cost and environmental damage of rotary drilling versus bulldozer trenching (Warfield and Thomas, 1972). Citigold Mining Company Ltd. acquired the project in 1985 and began a test heap leach, which was unsuccessful (Ryan Lode Mines, unpublished report, 1996). In 1986, La Teko Resources merged with Citigold, and a small, more successful heap leach test was conducted. Full scale production began in 1987. From 1987 to 1989, approximately 320,000 tons of ore were mined from the property by open pit methods (Rich Hughes, written commun., 1996). In recent years, sampling of the Ryan and Curlew ore bodies has been accomplished by both reverse circulation and core drilling, which began in 1990 and continued until 1993 (Ryan Lode Mines, Inc., unpublished report, 1996). In 1993, Citigold Alaska, Inc. was renamed Ryan Lode Mines, Inc. Exploration activity was suspended at the project at the end of 1993, although heap reclamation and detoxification efforts continue at the project site (Ryan Lode Mines, Inc., unpublished report, 1996). In 1997, over 8,000 feet of reverse-circulation holes were drilled on the Ryan Lode (Swainbank and Clautice, 1998, p. 8). In 1999, the property was acquired by Kinross Gold Corporation. The deposit is currently idle while geology and development teams evaluate recent drilling and metallurgical studies (Kinross Gold Corporation web site, 2001, http://www.kinross.com/op/expdev/ala.htm)

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Ryan Lode Mines, Inc., unpublished report, 1996

Comment (Geology): Age = McCoy and others (1997) dated both hydrothermal and intrusion-related minerals using the 40Ar/39Ar method. At the Ryan lode, hydrothermal white mica has been dated at 89.1 +/- 0.3 Ma, and white mica from hydrothermally altered schist has been dated at 87.6 +/- 0.3 Ma. The quartz diorite hornblende was dated at 90.6 +/- 0.3 Ma, and the quartz diorite biotite was dated at 90.2 +/- 0.3 Ma; both are cut by mineralized shear zones and thus are earlier than the mineralization.

References

Reference (Deposit): Moffit, F.H., 1927, Mineral industry in Alaska in 1925: U.S. Geological Survey Bulletin 792-A, p. 1-39.

Reference (Deposit): Smith, P.S., 1942, Mineral industry of Alaska in 1940: U.S. Geological Survey Bulletin 933-A, p. 1-102.

Reference (Deposit): Smith, P. S., 1933, Mineral resources of Alaska in 1931: U.S. Geological Survey Bulletin 844-A, p. 1-82.

Reference (Deposit): Smith, P.S., 1941, Mineral industry of Alaska in 1939: U.S. Geological Survey Bulletin 926-A, p. 1-106.

Reference (Deposit): Smith, P. S., 1933, Mineral resources of Alaska in 1930: U.S. Geological Survey Bulletin 836-A, p. 1-83.

Reference (Deposit): Smith, P. S., 1930, Mineral resources of Alaska in 1928: U.S. Geological Survey Bulletin 813-A, p. 1-72.

Reference (Deposit): Smith, P. S., 1930, Mineral industry of Alaska in 1927: U.S. Geological Survey Bulletin 810, p. 1-64.

Reference (Deposit): McCoy, Dan, Newberry, R.J., Layer, Paul, DiMarchi, J.J., Bakke, Arne, Masterman, J.S., and Minehane, D.L., 1997, Plutonic-related gold deposits of interior Alaska, in R.J. Goldfarb, and L.D. Miller, eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 191-241.

Reference (Deposit): Masterman, S.S., and Campbell, B., 1993, The Ryan Lode Project, Ester Dome, Alaska: Alaska Miner, June 1993, p. 11.

Reference (Deposit): Warfield, R.S., and Thomas, B.I., 1972, Rotary drilling exploration of the Ryan lode properties, Fairbanks mining district, Alaska: U.S. Bureau of Mines Open-File Report 72-23, 21 p.

Reference (Deposit): Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Fairbanks quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-662, 174 p.

Reference (Deposit): Glover, A.E., 1950, Placer gold fineness: Alaska Territorial Department of Mines Miscellaneous Report 195-1, 38 p.

Reference (Deposit): Killeen, P.L., and Mertie, J.B., 1951, Antimony ore in the Fairbanks District, Alaska: U.S. Geological Survey Open-File Report 51-46, 43 p.

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., 1972, Metallic mineral resources map of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-410, 1 sheet, scale 1:250,000.

Reference (Deposit): Joesting, H.R., 1942, Strategic mineral occurences in interior Alaska: Alaska Territorial Department of Mines Pamphlet 1, 46 p.

Reference (Deposit): Smith, P.S., 1939, Mineral industry of Alaska in 1938: U.S. Geological Survey Bulletin 917-A, p. 1-113.

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

Reference (Deposit): Swainbank, R.C., and Szumigala, D.J., 2000, Alaska's mineral industry 1999; a summary: Alaska Division of Geological and Geophysical Surveys Information Circular 46, 12 p.

Reference (Deposit): Smith, P.S., 1936, Mineral industry in Alaska in 1934: U.S. Geological Survey Bulletin 868-A, p. 1-91.

Reference (Deposit): Smith, P.S., 1933, Mineral industry in Alaska in 1931: U.S. Geological Survey Bulletin 844-A, p. 1-82.

Reference (Deposit): Smith, P.S., 1933, Mineral industry of Alaska in 1930: U.S. Geological Survey Bulletin 836-A, p. 1-83.

Reference (Deposit): Smith, P.S., 1932, Mineral industry of Alaska in 1929, in Smith, P.S., and others Mineral resources of Alaska, report on progress of investigations in 1929: U.S. Geological Survey Bulletin 824-A, p. 1-81.

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): Smith, P.S., 1930, Mineral industry of Alaska in 1928: U.S. Geological Survey Bulletin 813, p. 1-72.

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

Reference (Deposit): Smith, P.S., 1930, Mineral industry of Alaska in 1927: U.S. Geological Survey Bulletin 810-A, p. 1-64.

Reference (Deposit): Mertie, J.B. Jr., 1917, Lode mining in the Fairbanks District, Alaska: U.S. Geological Survey Bulletin 662-H, p. 403-424.

Reference (Deposit): Brooks, A.H., 1912, The Alaska mining industry in 1911, in Brooks, A.H., and others, Mineral resources of Alaska, 1911: U.S. Geological Survey Bulletin 520, p. 17-44.

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.

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