Evelyn Lee

Site Name

Primary: Evelyn Lee

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Commodity

Primary: Copper
Primary: Gold
Primary: Silver

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Location

State: Alaska
District: Koyukuk

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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: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Model Name: Porphyry Cu, skarn-related

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Potassic and sericitic alteration in the meta-igneous rocks. Calc-silicate hornfels.

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Rocks

Name: Hornblendite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Devonian

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Analytical Data

Not available

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Materials

Ore: Bornite
Ore: Chalcopyrite
Ore: Gold
Ore: Pyrite

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Comments

Comment (Geology): Age = Devonian based on reported Early Devonian Pb/Pb zircon ages from the associated Baby Creek batholith and Horace Mountain plutons (Dillon and others, 1996).

Comment (Exploration): Status = Active

Comment (Reference): Primary Reference = Ventures Resource Corporation, 1998

Comment (Deposit): Model Name = Porphyry Cu, skarn-related deposits (Cox and Singer, 1986; model 18a)

Comment (Reserve-Resource): Reserves = Estimates of potential for this property ranges from about 1 million metric tons of 5 percent Cu (DeYoung, 1978) to 'tens of million of tons grading 2 percent to 5 percent Cu with gold and silver credits' (Ventures Resource Corporation website, 1998, URL http://www.venturesresource.com/).

Comment (Deposit): Other Comments = See also: Venus (CH065), Victor (CH064), Eva (CH063), and Geroe Creek (CH053) prospects. Alaska Kardex No. KX-31-53H (Kardex is a card file mining claim information system located at the State of Alaska DNR Public Information Center in Fairbanks).

Comment (Geology): Geologic Description = The Evelyn Lee prospect is one of a number of Cu skarn deposits in the Chandalar area which have been described in general by Newberry and others (1986). They are all located northwest of the belt of the Devonian(?) Horace Mountain granitic rocks. Many of the Cu skarns exhibit both prograde garnet/pyroxene and retrograde epidote and actinolite mineral assemblages. Newberry and others (1986) stateed that the mineralogy, mineralization, and alteration of these skarns tend to place them in the category of continental-margin, porphyry-related copper skarns. ? Dillon and others (1996) mapped the area as Devonian Horace Mountain granite gneiss and Devonian felsic schists with proximal tactite and calcareous hornfels. The Devonian felsic schists are interpreted by Dillon and others (1996) as hypabyssal to plutonic in origin, but they are not included in the Horace Mountain plutonic assemblage. Early descriptions (early to mid-1970s) of the Evelyn Lee prospect described chalcopyrite, bornite, and pyrite in isolated skarn bodies that occur in marble in the Skajit Limestone near or at the contact with Devonian hornblende granodiorite porphyry. Skarn bodies were reported to be as much as 100 m long and 10 m wide. Copper grades as high as 10 percent Cu were obtained from outcrops. Altered and pyritized meta-granodiorite bodies are spatially associated with the mineralized skarns. ? Mineralization on the property has been described by Ventures Resource Corp. as consisting of pyrite, chalcopyrite, and bornite with silver and gold found in metamorphosed VMS, skarn, and sheared granitic-hosted deposits. Ventures Resource considers the target model for this prospect to be copper-gold skarn mineralization related to copper porphyry-type intrusives. The host rocks are volcanogenic calc-schist, chloritic calc-schist, limestone and dolomite, and intensely sheared granitic intrusive. Structurally, the host rocks form a broad syncline intruded along the keel by granodiorite. Assays include grades of 9.9 percent Cu and 8.17 ounces of silver per ton from a 7-foot-thick zone of sulfides in skarn, and a 5-foot surface sample which grades 5.6 percent Cu and 0.04 ounce of gold per ton. A core sample assayed 3.5 percent Cu over a 23.5-foot drill intercept.

Comment (Workings): Workings / Exploration = Claims were staked in 1969 and 1970. The property was selected by Doyon, Limited (an Alaska Native Corporation) in the early 1970s as part of Alaska Native Claims Settlement Act (ANCSA) settlement. In 1998 the Evelyn Lee property was being explored by Ventures Resource Corporation under the terms of an exploration agreement with the owner, Doyon, Limited. Sampling results from a large soil sample grid (approximately 5,000 feet x 2,500 feet ) shows extensive areas of more than 500 ppm Cu in soil (Ventures Resource Corporation,1998). A grade 9.9 percent Cu and 8.17 ounces of Ag per ton of was obtained from sampling of a 7-foot-thick sulfide layer in skarn. Two shallow core drill holes have explored one of the copper soil anomalies. This drilling encountered mineralization that assayed 3.5 percent copper from surface to 23.5 feet and 2 percent copper from surface to 18 feet.

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References

Reference (Deposit): Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

Reference (Deposit): Maas, K.M., 1987, Maps summarizing land availability for mineral exploration and development in northern Alaska, 1986: U.S. Bureau of Mines Open-File Report 10-87, 33 quadrangle overlays.

Reference (Deposit): Newberry, R.J., Allegro, G.L., Cutler, S.E., Hagen-Levelle, D.D., Adams, D.D., Nicholson, L.C., Weglarz, T.B., Bakke, A.A., Clautice, K.H., Coulter, G.A., Ford, M.J., Myers, G.L., and Szumigala, D.J., 1997, Skarn deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 355-395.

Reference (Deposit): Nokleberg, W.J., Bundtzen, T.K., Dawson, K.M., Eremin, R.A., Goryachev, N.A., Koch, R.D., Ratkin, V.V, Rozenblum, I.S., Shpikerman, V.I., Frolov, Y.F., Gorodinsky, M.E., Melnikov, V.D., Diggles, M.F., Ognyanov, N.V., Petrachenko, E.D., Petrochenko, R.I., Pozdeev, A.I., Ross, K.V., Wood, D.H., Grybeck, D., Khanchuck, A.I., Kovbas, L.I., Nekrasov, I.Y., and Sidorov, A.A., 1996, Significant metalliferous and selected non-metalliferous lode mineral deposits and placer districts, and for metallogenesis of the Russian Far East, Alaska, and the Canadian Cordillera: U.S. Geological Survey Open-File Report 96-513-B, 385 p.; U.S. Geological Survey Open-File Report 96-513-B, 385 p. (CD-ROM format).

Reference (Deposit): Nokleberg, W.J., Bundtzen, T.K., Grybeck, D.J., Koch, R.D., Eremin, R.A., Rozenblum, I. S., Sidorov, A.A., Byalobzhesky, S.G., Sosunov, G.M., Shpikerman, V.I., Gorodinsky, M.E., 1993, Metallogenesis of mainland Alaska and the Russian Northeast: U.S. Geological Survey Open-File Report 93-0339, 3 sheets, 230 p.

Reference (Deposit): DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-B, 2 sheets, scale 1:250,000.

Reference (Deposit): Ventures Resource Corporation, 1998, 1997 Annual Report and Website (Worldwide Web URL http://www.venturesresource.com/).
URL: http://www.venturesresource.com/

Reference (Deposit): Marsh, S.P., and Wiltse, M.A., 1978, Composite geochemical map showing major alteration zones, and detailed geologic maps of selected mineral prospects, Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-I, 1 sheet, scale 1:250,000.

Reference (Deposit): Adams, D.D., and Dillon, J.T., 1985, Geochemical investigations in the Chandalar C-5 and C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public-Data File 85-26, 37 p., 3 sheets, scale 1:63,360. (Superseded by RI 88-15.)

Reference (Deposit): Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.

Reference (Deposit): Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, Donald, Robinson, M.S., Smith, T.E., and Yeend, Warren, 1988, Metallogeny and major mineral deposits of Alaska: U.S. Geological Survey Open-File Report 88-73, 97 p., 2 plates, scale 1:5,000,000.

Reference (Deposit): Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752

Reference (Deposit): Adams, D.D., and Dillon, J.T., 1985, Geochemical investigations in the Chandalar C-5 and C-6 quadrangles, Alaska: Alaska Division of Geological and Geophysical Surveys Public-Data File 85-26, 37 p., 3 sheets, scale 1:63,360. (Superseded by RI 88-15.)

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