Mine detail: Eva Mines complex

Previously called 'New BostonMineral ChiefMolineMichelleMuscoviteSpartanMark One VentureKelly Tunnel'

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Location

Lat / long:

39.71469, -105.69869

Resource(M)

Primary:	Lead
Secondary:	Silver, Zinc, Gold
Ore:	Galena, Pyrite, Sphalerite
Gangue:	Biotite, Feldspar, Goethite, Kaolin, Limonite, Muscovite, Quartz, Siderite

Production

Operation type:	Underground
Development status:	Past Producer
First production started:	1976

Geology

Structure:	vein intersections are favorable, increasing depth is not
Alteration processes:	silicification and fuchsite (Cr-muscovite)

References

MAS	80190009
DEP	10214765
Reference	{Deposit:: CLARK, T.A.,1975, ORE RESERVE ESTIMATION IN VEIN DEPOSITS:}{Deposit:: UNPUBLISHED SENIOR REPORT, COLO. SCH. MINES 17P.}{Deposit:: Spurr, J. E., Garrey, G. H., and Ball, S. H., 1908, Economic geology of the Georgetown quadrangle, Colorado: U.S. Geological Survey Professional Paper 63, 422 p.}{Deposit:: REF:COLO DIV.OF MINES,A SUMMARY OFMINERAL ACTIVITIES IN COLO}{Deposit:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.}
Reporter	Colorado School Of Mines, Beach, Richard A.