Mine detail: Last Chance Mine

Previously called ''

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Location

Lat / long:

45.71009, -122.21451

Resource(M)

Primary:	Copper, Vanadium, Gold, Silver
Tertiary:	Lead, Zinc
Ore:	Bornite, Chalcocite, Chrysocolla, Descloizite, Malachite
Gangue:	Pyrite, Quartz
Orebody form:	VEIN
Discovery year:	1900

Production

Operation type:	Unknown
Production size:	None
Development status:	Occurrence

Geology

Host rock:	Silver Star Pluton
Host type:	Diorite
Tectonic:	Cascade Volcanic Arc
Alteration processes:	Locally Extensive Silicification And Argillization In Vein But Wall Rocks Only Weakly Propylitized

References

MRDS	M700177
DEP	10047849
Reference	{Analytical Data:: QUARTZ DIORITE}{Deposit:: HUNTTING, M.T., 1956, INVENTORY OF WASHINGTON MINERAL - PART II, METALLIC MINERALS: WASHINGTON DIVISION OF MINES AND GEOLOGY BULLETIN 37, V. 1, P. 77.}{Deposit:: MOEN, W.S., 1977, ST. HELENS AND WASHOUGAL MINING DISTRICTS OF THE SOUTHERN CASCADES OF WASHINGTON: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES INFORMATION CIRCULAR 60, P. 43, 53-55.}{Deposit:: PHILLIPS, W.M., 1987, GEOLOGIC MAP OF THE VANCOUVER QUADRANGLE, WASHINGTON AND OREGON: WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES OPEN-FILE REPORT 87-10, SCALE 1:100,000.}
Reporter	Caress, Mary E. (Evarts, Russ), Peterson, Jocelyn A.