Mine detail: Mastadon Mine

Previously called 'Patented Claims: Golden Cross No. 1, MS 14152Golden Needle, MS 14152Air Line, MS 14152Golden Slipper No. 1, MS 14152Golden Slipper No. 2, MS 14152Patented Claims: Golden Cross No. 1, MS 14152aGolden Needle, MS 14152aAir Line, MS 14152aGolden Slipper No. 1, MS 14152aGolden Slipper No. 2, MS 14152aGolden Cross Mill Site, MS 14152bGreen River, MS 15230Grand View, MS 15230Tip Top, MS 15230American, MS 15231Sideline, MS 15231Washington, MS 15231Crown, MS 15231'

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Location

Lat / long:

37.62029, -107.68453

Resource(M)

Primary:	Silver
Secondary:	Lead, Gold
Gangue:	Chlorite, Limonite, Quartz
Discovery year:	1900

Production

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

Geology

Host rock:	Irving Formation
Host type:	Gneiss
Associated rock:	Eolus Granite;Intrusive Bodies And Related Rocks (Younger And Older Bodies Of Chicago Basin Stock)
Associated type:	Quartz Monzonite,Rhyolite,Granite
Structure:	San Juan Uplift, San Juan Basin, San Juan Volcanic Field, Needle Mtns Uplift, Eolus Batholith, Chicago Basin Stock, Trimble Stock
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010709
DEP	10014085
Reference	{Deposit:: CROSS, WHITMAN, AND OTHERS, 1905, DESCRIPTION OF THE NEEDLE MOUNTAINS QUADRANGLE, COLORADO: USGS FOLIO 131.}{Deposit:: SCHMITT, L.J., AND RAYMOND, W.H., 1977, GEOLOGY AND MINERAL DEPOSITS OF THE NEEDLE MOUNTAINS DISTRICT, SOUTHWESTERN COLORADO: USGS BULL. 1434, 40 P.}{Deposit:: STEVEN, T.A., AND OTHERS, 1969, MINERAL RESOURCES OF THE SAN JUAN PRIMITIVE AREA, COLORADO: USGS BULL. 1261-F.}{Deposit:: SCOTT, D.C., 1983, MINERAL INVESTIGATION OF THE WEST NEEDLE WILDERNESS STUDY AREA AND THE BLM WEST NEEDLE CONTIGUOUS WILDERNESS STUDY AREA, LA PLATA AND SAN JUAN COUNTIES, COLORADO: USBM MLA 35-83, P. 6, 26-35}{Deposit:: BLM MINERAL SURVEYS MS 14152, 15230, 15231}
Reporter	Schwochow, Stephen D.