Rico District

Montezuma, Dolores County, Colorado, United States

ZincSilverLeadCopperSulfur-PyriteGoldSulfurSulfuric AcidCadmiumAluminumIronManganese

⌖ Show on map USGS source ↗

Commodities

PrimaryZinc, Silver, Lead, Copper

SecondarySulfur-Pyrite, Gold, Sulfur, Sulfuric Acid, Cadmium

TertiaryAluminum, Iron, Manganese

Commodity typeB

Deposit

Model72: Polymetallic replacement

Deposit sizeS

Materials

Ore mineralsAlunite

GangueAlabandite, Allanite, Allophane, Andalusite, Aragonite, Barite, Calcite, Celestite, Chlorite, Clinozoisite, Cordierite, Diaspore, Dolomite, Epidote, Fluorite, Garnet, Helvite, Huebnerite, Jarosite, Kaolinite, Limonite, Magnetite, Molybdenite, Prehnite, Pyrolusite, Rhodochrosite, Rutile, Sericite, Serpentine, Siderite, Sphene, Tetradymite, Topaz, Tourmaline

Geology

Associated rockMonzonite,Hornblendite,Latite,Basalt,Lamprophyre,Granite

StructureRico Dome, Calico Peak Anticline; Principal Named Faults: Alaskite, Blackhawk, Futurity, Hidden, Honduras, Knob Hill, Last Chance, Nellie Bly, Princeton, Sandstone Mountain, Silver Creek, Smelter, South Park, Spruce Gulch, 210 Drift, Yellow Jacket

AlterationOxidation Of Pyrite Replacement To Au-Ag-Bearing Limonitic Iron Ore; Alteration Of Manganiferous Carbonates To Mn Oxides; Alteration Of Base-Metal Sulfides To Carbonates And Sulfates; Alteration Of Ag Minerals (Argentite) To Native Ag And Embolite (Cerargyrite And Bromyrite); Sericitization Of Feldspar In Porphyry And Arkosic Sandstone; Solfataric Alteration To Alunite At Calico Peak.

Economic & production

Development statusPast Producer

Identification

Deposit ID10014148

MRDS IDD010797

Alternate namesPioneer District

RegionNA

Data scoreB

Coordinates37.69279, -108.03065

References

MCKNIGHT, 1974, P. 6; HENDERSON, 1926, P. 117; USBM MINERAL YEARBOOKS 1969-1981; COLORADO DIVISION OF MINES ANNUAL OPERATOR REPTS.