Description
Elwood Mining And Separating Company (First Claimant)
Commodities
PrimarySilver, Lead, Zinc
SecondaryGold, Copper, Molybdenum
TertiaryCadmium, Bismuth
Commodity typeM
Deposit
Model85: Polymetallic veins
Deposit sizeN
Ore controlFaults And Radial Dikes Related To Platoro Caldera And Emplacement Of Crater Creek Stock
Materials
Ore mineralsChalcopyrite, Molybdenite, Pyrite, Pyrrhotite, Sphalerite
GangueBarite, Calcite, Hematite, Limonite, Magnetite, Quartz
Geology
Host rockMonzonite,Conglomerate,Volcanic Rock (Aphanitic),Volcanic Breccia (Agglomerate),Rhyodacite,Andesite · Conejos Formation--Volcaniclastic Facies;Conejos Formation--Vent Facies
Associated rockMonzonite,Rhyodacite,Quartz Latite,Andesite · Intrusive Rocks--Monzonite;Intrusive Rocks--Quartz Latite, Andesite, And Rhyodacite Porphyries
StructureSan Juan Volcanic Field, Platoro Caldera, Elwood Creek Fault Zone, Crater Creek Stock, Quartz Creek Anticline
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
AlterationZoned Alteration Observed Includes 1) Outer Chloritic Zone Of Hydrothermal Alteration With Chlorites, Carbonates, Celadonite, Montmorillonite Clays, Silica Minerals, And Zeolites Enveloping 2) Propylitic Zone Of Albite, Calcite, Chlorite, And Epidote (Derived From Plagioclase And Ferromagnesian Minerals), Enveloping 3) Silicic Zone Of Quartz Veining And Replacement; 4) Phyllic Zone Of Pyritic Quartz-Sericite Rock. Inner Potassic And Pyrogenic Zones, If Present, Not Exposed.
Economic & production
Development statusOccurrence
Discovery year1895
Identification
Deposit ID10094659
MRDS IDD010620
Alternate namesClaims: Shackman Mill Site, MS 9735, Robert Burns, MS 9932, East Boston, MS 10261a, Shackman, MS 10261a, Goodie Queen, MS 10261a, West Field, MS 10261a, Nantucket, MS 10261a, Topeka, MS 10261a, Elwood Mill Site, MS 10261b, Chicago Placer, MS 14147, Emma May, MS 14164, Riverside No. 1, MS 20517, June Bug Nos. 1-2, MS 20517, Treasure Comstock Group, Lady Bug Mine
RegionNA
Data scoreA
Coordinates37.38891, -106.69505
References
LINDQUIST, A.E., 1977, METALLIC AND COAL RESOURCES, IN MINERAL RESOURCES OF THE CHAMA-SOUTHERN SAN JUAN MOUNTAINS WILDERNESS STUDY AREA, MINERAL, RIO GRANDE, ARCHULETA, AND CONEJOS COUNTIES, COLORADO: USGS OPEN-FILE REPT. 77-309.LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHEASTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-828.COLORADO DIV. MINES INF. REPTS. (LADY BUG MINE)BLM MINERAL SURVEYS MS 9735, 9932, 10261A&B, 14164, 21517LARSEN, E.S., JR., AND CROSS, WHITMAN, 1956, THE GRANODIORITES IN THE CENTRAL PART OF THE SUMMITVILLE QUADRANGLE, IN GEOLOGY AND PETROLOGY OF THE SAN JUAN REGION, SOUTHWESTERN COLORADO: USGS PROF. PAPER 258, P. 106-108.LIPMAN, P.W., 1975, EVOLUTION OF THE PLATORO CALDERA COMPLEX AND RELATED VOLCANIC ROCKS, SOUTHESATERN SAN JUAN MOUNTAINS, COLORADO: USGS PROF. PAPER 852.