Eva

The Eva is a copper 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: Eva

Commodity

Primary: Copper
Secondary: Silver
Secondary: Gold

Location

State: Alaska
District: Koyukuk

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Model Name: Porphyry Cu, skarn-related

Orebody

Not available

Structure

Not available

Alterations

Alteration Text: Propylitic and sericitic alteration of the meta-granodiorite and retrograde epidote/actinolite alteration of the skarns.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Magnetite
Ore: Pyrite

Comments

Comment (Deposit): Other Comments = See also: Victor (CH064), Venus (CH065), and Evelyn Lee (CH059). Much of the published information on the Eva prospect is combined with descriptions of the Venus and Victor prospects. The land (and presumably the original claims) have been acquired by Doyon, Limited via its Alaska Native Claims Settlement Act selections. Bornite and chalcopyrite sightings have been reported in cliffs along Mathews River (DeYoung, 1978, loc. 72). They may be related to the Eva prospect.

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

Comment (Exploration): Status = Not determined

Comment (Workings): Workings / Exploration = Surface sampling only.

Comment (Reference): Primary Reference = Nicholson, 1990

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 (Geology): Geologic Description = The Eva prospect is one of several Cu skarn deposits in the Chandalar area which have been described in general by Newberry and others (1986). They are all northwest of a belt of Devonian(?) granitic rocks informally named the Horace Mountain plutons. Many of these Cu skarns exhibit both prograde garnet and pyroxene and retrograde epidote and actinolite mineral assemblages. Newberry and others (1986) stated that the mineralogy, mineralization, and alteration of these skarns tend to place them in the category of continental-margin, porphyry-related copper skarns. Published descriptions of individual prospects in this group are scarce. Some of the descriptions of the Eva prospect include it with the nearby Victor and Venus prospects (DeYoung, 1978; Cobb and Cruz, 1983). The Venus prospect in particular is characterized by porphyry-related mineralization, and the Eva prospect thus has been characterized as a porphyry copper and (or) copper skarn deposit (Cobb and Cruz, 1983). Newberry and others (1986), however, classified it as a Cu skarn. Dillon (1996) mapped the prospect area principally as Devonian hornblende granodiorite gneiss of the Horace Mountain pluton and contact-related tactite and calcareous hornfels. Outcrop areas of pyritized meta-granodiorite intrusives near the Eva prospect are smaller than those at either the nearby Victor or Venus prospects. The limited information available suggests that the principal deposit at the Eva prospect is a copper-bearing garnet and pyroxene skarn. Unlike the Venus prospect, there is little evidence at the Eva prospect that suggests appreciable copper mineralization in the intrusive rocks. Although the distribution of copper in the meta-igneous rocks and the related skarns is unclear, the available published information suggests that copper is more abundant in the skarns. Nicholson (1990) noted that some workers have characterized the mineralization in the Big Spruce Creek area as volcanogenic in origin, although this model is not widely accepted.

References

Reference (Deposit): Nicholson, L.M., 1990, Porphyry copper, copper skarn, and volcanogenic massive sulfide occurrences in the Chandalar copper district, Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 164 p.

Reference (Deposit): Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.

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): 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): 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/

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