Description
John A. Gilmore
Commodities
PrimaryGold, Silver, Lead
SecondaryCoal
TertiaryCopper, Zinc
Commodity typeM
Deposit
Deposit sizeS
Ore controlFissure Vein In Bounding Graben Fault
Materials
Ore mineralsArgentite, Chalcopyrite, Coal, Galena, Polybasite, Pyrargyrite, Pyrite, Sphalerite
GangueBarite, Epsomite, Gypsum, Melanterite, Quartz
Geology
Host rockShale,Sandstone · Dolores Formation;Dakota Sandstone
Associated rockGabbro,Lamprophyre · Microgabbro;Lamprophyre
StructureSan Juan Uplift, Paradox Basin, Rico Dome, Dunton Syncline, Emma Fault
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
First production1885
Last production1980
Discovery year1880
Identification
Deposit ID10014230
MRDS IDD010905
Alternate namesModern Mines Mil Site, Lion, MS 12930, Sirius, MS 12931, Little Emma, MS 12951a, Orion, MS 12953a, Brooklyn, MS 18498, May Flower, MS 18499, Unpatented Claims: Emmarette, Barbara, Patricia, CynthiaModern, Queenmary, Modern GoldModern Mines, Normandic, Modern Gold Mill Site, Patented Claims: Great Bear, MS 12930, Emmarette Mill Site
RegionNA
Data scoreB
Coordinates37.76723, -108.09843
References
BUSH, A.L., AND BROMFIELD, C.S., 1966, GEOLOGIC MAP OF THE DOLORES PEAK QUADRANGLE, DOLORES AND SAN MIGUEL COUNTIES, COLORADO: USGS MAP GQ-536.BASTIN, E.S., 1922, SILVER ENRICHMENT IN THE SAN JUAN MOUNTAINS, COLORADO: USGS BULL. 735-D, P. 116-120.COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.BLM MINERAL SURVEYS MS 12930, 12931, 12951A, 12953A, 18498, 18499KRANTZ, P.R., AND FREEMAN, W.H., 1923, A STUDY OF THE ORES OF DUNTON, DOLORES COUNTY, COLORADO: COLORADO SCHOOL OF MINES THESIS T-503.BASTIN, 1922, P. 120 (1913 FIGURES); COLORADO DIV. MINES ANNUAL OPERATOR REPTS. (1920-1980 FIGURES)