Eva Mines complex

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

Name: Eva Mines complex  

State:  Colorado

County:  Clear Creek

Elevation: 8,619 Feet (2,627 Meters)

Primary Mineral: Lead

Lat, Long: 39.7147, -105.69810

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Satelite image of the Eva Mines complex

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 indicate a claim status and does not necessarily indicate an area is open to prospecting.


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: