Mine detail: May Day Mine

Previously called 'Patented Claims: Gertrude, MS 16616May Day, MS 16985Golden Rule, MS 16985Gilmore, MS 16985Pat, MS 16985Hesperus, MS 16985Cimarron, MS 16985Kenton, MS 16985Lord Kitchner, MS 17108Sunrise, MS 17124Boston, MS 19078Tunnel, MS 19078Tram, MS 19078Thanksgiving, MS 19078Brooklyn, MS 20171'

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Location

Lat / long:

37.35307, -108.06926

Resource(M)

Primary:	Gold, Silver
Secondary:	Lead
Tertiary:	Copper, Zinc, Mercury, Tellurium, Antimony
Ore:	Bromyrite, Calaverite, Cerargyrite, Chalcopyrite, Galena, Krennerite, Petzite, Pyrite, Sphalerite, Sylvanite
Gangue:	Aragonite, Barite, Calcite, Hemimorphite, Quartz
Discovery year:	1903

Production

Operation type:	Unknown
Production size:	Small
Development status:	Past Producer
First production started:	1903
Last production ended:	1942

Geology

Host rock:	Pony Express Limestone Member And Marl Member Of Wanakah Formation;Entrada Sandstone
Host type:	Sandstone,Limestone
Associated rock:	Porphyritic Rocks--Diorite-Monzonite Porphyry
Associated type:	Diorite
Structure:	San Juan Uplift, Four Corners Platform, La Plata Dome, Idaho-Day Fault System
Tectonic:	Central Cordillera (Southern Rocky Mtns)

References

MRDS	D010838
DEP	10087917
Reference	{Deposit:: ECKEL, E.B., AND OTEHRS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 73-76, 143-149, PLS. 25, 26.}{Deposit:: MCCAUSLAND, R.D., 1934, REPORT ON THE DAY MINE, LA PLATA COUNTY: UNPUB. ENG. REPT., 20 P.}{Deposit:: COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.}{Deposit:: BLM MINERAL SURVEYS MS 16616, 16985, 17108, 17124, 19078, 20171}{Production:: ECKEL AND OTHERS, 1949, P. 144 (AS COMPILED FROM USGS AND USBM RECORDS); COLORADO DIV. MINES ANNUAL OPERATOR REPTS.}
Reporter	Schwochow, Stephen D.