Description
Richard Gaines
Commodities
PrimarySilver, Gold
TertiaryAntimony, Tellurium, Mercury, Copper
Commodity typeM
Deposit
Deposit typeVein
Model85: Polymetallic veins
Deposit sizeS
WorkingsUnderground
Ore controlShale-Porphyry Contact; Fault Zone Split
Materials
Ore mineralsArgentite, Bornite, Chalcopyrite, Coloradoite, Covellite, Enargite, Krennerite, Petzite, Sylvanite
GangueAnkerite, Barite, Chlorite, Dickite, Epidote, Halloysite, Limonite, Quartz, Tourmaline
Geology
Host rockDiorite,Shale · Cutler Formation
Associated rockDiorite · Porphyritic Rocks--Diorite-Monzonite Porphyry
StructureLa Plata Dome, San Juan Uplift, Four Corners Platform
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
AlterationWall Rock Strongly Altered Near Dike. Shale And Porphyry Groundmass Bleached And Silicified 2 To 10 Ft From Fracture Zones. Feldspars In Porphyry And Arkose Altered To Sericite And Halloysite; Hornblende Altered To Chlorite, Epidote, And Carbonate In Partly Altered Porphyry, But In More Thoroughly Altered Rock Closer To Vein Consists Of Intergrown Tourmaline, Sericite, And Chlorite With Disseminated Pyrite.
Economic & production
Development statusPast Producer
First production1901
Last production1949
Discovery year1895
Identification
Deposit ID10014182
MRDS IDD010845
Alternate namesLegal Tender, MS 15974, Sunnyside, MS 15974, Neglected, MS 15974, Patented Claims: Mountain View, MS 15973, Bunker Hill, MS 15974, Monument, MS 15974, Maid of Erin, MS 15974, Over Sight, MS 15974, Elkton, MS 15974, Little Johney, MS 15974, Silver Night, MS 15974
RegionNA
Data scoreA
Coordinates37.43667, -107.94528
References
ECKEL, E.B., AND OTHERS, 1949, GEOLOGY AND ORE DEPOSITS OF THE LA PLATA DISTRICT, COLORADO: USGS PROF. PAPER 219, P. 73-76, 156-158EMMONS. W.H., 1905, THE NEGLECTED MINE AND NEAR-BY PROPERTIES, DURANGO QUADRANGLE, COLORADO: USGS BULL. 260, P. 121-127.BRECKON, L.S., 1934, REPORT ON THE COLORADO-JUNEAU MINES, INC., ORO FINO MINING DISTRICT, LA PLATA COUNTY, SOUTHWESTERN COLORADO: UNPUB. ENG. REPT., 14 P.EVANS, W.S., (NO DATE), REPORT ON THE NEGLECTED MINES, LA PLATA COUNTY: UNPUB. ENG. REPT., 5 P.COLORADO DIV. MINES INF. REPTS.BLM MINERAL SURVEYS MS 15973, 15974ORT, J.C., 1933, REPORT OF TESTS CONDUCTED ON SAMPLE OF ORE FROM COLORADO-JUNEAU MINES, INC.: UNPUB. REPT., 4 P.U.S. Bureau of Mines, 1965, Mercury potential in the United States: U.S. Bureau of Mines IC-8252, 376 p.Neubert, J.T., and others, 1992, Mineral appraisal of San Juan National Forest, Colorado: U.S. Bureau of Mines Mineral Land Assessment Open-File Report MLA 2-92, 311 p., 4 appendices, 2 plates.ECKEL AND OTHERS, 1949, P. 156 (AS COMPILED FROM USGS AND USBM RECORDS); BRECKON (1934); COLO. DIV. MINES ANNUAL OPERATOR REPTS.