Mine detail: Excelsior Tunnel

Previously called 'Last Chance claim'

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Location

Lat / long:

37.61446, -105.27

Resource(M)

Primary:	Silver
Secondary:	Gold
Ore:	Hematite
Gangue:	Calcite

Production

Operation type:	Underground
Deposit type:	vein
Production size:	None
Development status:	Prospect

Geology

Host rock:	Minturn Formation
Host type:	Limestone
Associated rock:	Monzonite Porphyry
Associated type:	Monzonite
Structure:	Sierra Blanca Massif, Ft. Garland Embayment, Vega Cr. Anticline, Wagon Mesa Fault
Tectonic:	Central Cordillera (Southern Rocky Mtns.)

References

MRDS	D006738
DEP	10011666
Reference	PATTON, H.B., AND OTHERS, 1910, GEOLOGY OF THE GRAYBACK MINING DISTRICT, COSTILLA COUNTY, COLORADO: CGS BULL. 2
Reporter	Schwochow, Stephen D.