The Eva Mines complex is a lead mine located in Clear Creek county, Colorado at an elevation of 8,619 feet.
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
Elevation: 8,619 Feet (2,627 Meters)
Commodity: Lead
Lat, Long: 39.7147, -105.69810
Map: View on Google Maps
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Eva Mines complex MRDS details
Site Name
Primary: Eva Mines complex
Secondary: New Boston
Secondary: Mineral Chief
Secondary: Moline
Secondary: Michelle
Secondary: Muscovite
Secondary: Spartan
Secondary: Mark One Venture
Secondary: Kelly Tunnel
Commodity
Primary: Lead
Secondary: Silver
Secondary: Zinc
Secondary: Gold
Location
State: Colorado
County: Clear Creek
District: Georgetown-Silver Plume District
Land Status
Land ownership: Mixed
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Type: Private Lease
Type: Located Claim
Type: Patented
Workings
Type: Underground
Ownership
Owner Name: Raymond P Heon
Home Office: Colorado
Info Year: 1974
Owner Name: Mark One Ventures
Percent: 100.0
Home Office: Colorado
Info Year: 1976
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Underground
Mining Method: Unknown
Year First Production: 1976
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Not available
Structure
Type: L
Description: vein intersections are favorable, increasing depth is not
Alterations
Alteration Type: L
Alteration Text: silicification and fuchsite (Cr-muscovite)
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Galena
Ore: Pyrite
Ore: Sphalerite
Gangue: Siderite
Gangue: Quartz
Gangue: Muscovite
Gangue: Limonite
Gangue: Kaolin
Gangue: Goethite
Gangue: Feldspar
Gangue: Biotite
Trace: Gold
Comments
Comment (Names): Eva Mines group includes the old Kelly, Moline, New Boston, Spartan, Mineral Chief, Muscovite, and Michelle workings, now owned by Mark I Venture. (Sunshine files)
Comment (Geology): The Boston vein, a fissure sulfide vein, strikes NE and dips steeply SE; the main branch is the Beecher and the main ore shoot is localized here. The veins are often bounded by gneiss, granite, and porphyry dikes.
Comment (Location): In Silver Gulch, just NW of Georgetown, in secs. 7-8, T 4 S, R 74 W.
Comment (Deposit): MARK 1 VENTURES GEORGETOWN COLORADO JUNE 1976 ENVIROMENTAL: THE MIXED DOMAIN INCLUDES NATIONAL FOREST,PRI AND MUNCIPAL LAND. THE PROPORTY IS ALSO VERY CLOSE TO INTE 70. THE LAND AND AESTHETIC SENSITIVITY IS DUE TO THE PROXI I-70 DEPOSIT: THE ORE IS FOUND IN PARALLEL FRACTURES WITH 60 TO SEPARATION,ABOUT 10% OF THE LENGTH OF THE FRACTURES IS ECO ALLY MINERALIZED. THE SURFACE OF THE DEPOSIT IS OXIDIZED A GENERALLY COVERED WITH SOIL AND SCREE BENEFICIATION: ORE BENEFICIATION IS DONE IN BLACKHAWK, C A FEE BASIS - BOODLE MILL 50 STD TPP THE MENDOTA PROPERTY ADJOING THE PRESENT RAND IS REPORTEDLY OPTION THE DIP OF THE ORE ZONES IS VERTICAL TO PLUS OR MINUS 80 DE THE OPENINGS ARE SUBJECT TO AIR SLACK PRODUCTION IS 5 STD TONS PER MANSHIFT, DILUTION RUNS 10-15 TRUCKING FROM THE MINE TO THE MILL COSTS $5 PER STD TON UN ING COST IS $25 STD TON, WITH MILLING COSTS AT $22 PER STD EMPLOYEES: 20-25 AT $6 HR MINER AND $5.50 HR FOR HELPERS. T ECONOMIC THE PB CONC MUST ASSAY GREATER THAN 50% PB AND THE CONC MUST ASSAY GREATER THAN 55%. COST ESTIMATES THOUSAND DOLLARS 000 OMITTED JUNE 1976 ACQUISITION COST 3000 PURCHASE PRICE EXPLORATION 60 DRIFTING (EST. 1000 FT DEVELOPEMENT MINE 200 TO DATE ESTIMATE MILL 0 LEASE EQUIPMENT MINE 200 FROM EQUIP LIST WORKING CAPITAL 125 90 DAY OPERATING COSTS TOTAL 3585 ESTIMATED INCOME PER TONNE ORE: ORE VALUE 76.5 JUNE 19 MINING (27.5) MILLING (24.25) HAULAGE (5.75) SMELTER (6.00) NON-PAY AND NON-RECOVER (23.00) 30% EST NET PER TONNE (10.00) LOSS MINIMUM ORE VALUE REQUIRED FOR PROFIT IS $86.50 PER TONNE AT 100 TPP MINIMUM ORE VALUE REQUIRE TO RETURN 10% ON INVES IS $103 PER TONNE
Comment (Production): PRODUCTION IS ONGOING
Comment (Reserve-Resource): Optimistic resource estimates may not be valid. (Sunshine files)
Comment (Workings): Kelly tunnel was driven NW for 2680 ft. to intersect veins at depth, but little ore was found.
References
Reference (Deposit): UNPUBLISHED SENIOR REPORT, COLO. SCH. MINES 17P.
Reference (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.
Reference (Deposit): REF:COLO DIV.OF MINES,A SUMMARY OFMINERAL ACTIVITIES IN COLO
Reference (Deposit): Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.
Reference (Deposit): CLARK, T.A.,1975, ORE RESERVE ESTIMATION IN VEIN DEPOSITS:
Colorado Mining Photos
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