Mine detail: Rockfield Mine

Previously called 'Unpatented Claims: RodkfieldPendergast TunnelValentine Lod EMatchless Nos. 1 and 2'

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Location

Lat / long:

40.71165, -105.60254

Resource(M)

Primary:	Gold, Silver
Ore:	Pyrite
Discovery year:	1916

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	Small
Development status:	Past Producer
First production started:	1937
Last production ended:	1941

Geology

Host rock:	Metamorphic Rocks--Felsic And Hornblendic Gneisses;Laramide Intrusive Rocks--Quartz Monzonite Porphyry
Host type:	Gneiss
Associated rock:	Laramide Intrusive Rocks--Quartz Monzonite Porphyry
Associated type:	Quartz Monzonite
Structure:	Front Range Uplift, Sherman Batholith, Poudre River Shear Zone, Elkhorn Creek Shear Zone
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010597
DEP	10014002
Reference	{Deposit:: LOVERING, T.S., AND GODDARD, E.N., 1950, GEOLOGY AND ORE DEPOSITS O F THE FRONT RANGE, COLORADO: USGS PROF. PAPER 223, P. 285-286}{Deposit:: COLORADO DIV. MINES INF. REPT. AND ANNUAL OPERATOR REPT.}{Production:: COLORADO DIV. MINES ANN. OPERATOR REPTS.}
Reporter	Schwochow, Stephen D.