Mine detail: Las Animas Placers

Previously called 'Slapjack HillJones HillGold Dust Placers: OccurrencesGold Run GulchLittle Gold Run Gulch: Other OccurrencesDutch GulchLuxemburg Placers: OccurrencesGrayback GulchHunkidori GulchGreenhorn GulchWicks GulchRattlesnake GulchBonanza Gulch'

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Location

Lat / long: 32.9515, -107.50199

Resource(M)

Primary: Gold
Secondary: Silver
Tertiary: Osmium, Iridium, Platinum
Ore: Gold, Iridosmine, Silver
Gangue: Limonite, Magnetite, Pyrite
Orebody form: STREAM SEDIMENT DEPOSITS

Production

Operation type: Unknown
Deposit type: Stream Placer
Production size: Medium
Development status: Producer
First production started: 1877
Last production ended: 1975

Geology

Host rock:Santa Fe
Host type:Gravel
Associated type:Monzonite,Latite,Andesite
Structure:Fault With About 2,000 Ft Displacement, Quartz Monzonite Porphyry And Mineralized Veins Occur 2 Mi East And Upstream From Placer Sites. A Caliche Layer Separates Gold-Bearing Gravels From Barren Gravels.
Tectonic:Basin And Range
Alteration processes:Oxidation Of Auriferous Pyrite To Pseudomorphs Of Limonite Which Retain Gold Gives The Black Sand Concentrates A Commercial Value For Smelter Treatment.

References

MRDSM045549
DEP10038244
Reference{Deposit:: NORTHROP, S.A., 1959, MINERALS OF NEW MEXICO, REVISED EDITION: ALBUQUERQUE, UNIVERSITY OF NEW MEXICO PRESS, P. 300.}{Deposit:: JONES, F.A., 1904, NEW MEXICO MINES AND MINERALS (WORL* FAIR ED.): SANTA FE, NEW MEXICO PRINTING CO., P. 349.}{Deposit:: JOHNSON, M.G., 1972, PLACER GOLD DEPOSITS OF NEW MEXICO: U.S. GEOLOGICAL SURVEY BULLETIN 1348, P. 25-26.}{Deposit:: HARLEY, G.T., 1934, THE GEOLOGY AND ORE DEPOSITS OF SIERRA COUNTY, NEW MEXICO: NEW MEXICO BUREAU OF MINES AND MINERAL RESOURCES BULLETIN 10, P. 166-169.}{Deposit:: LINDGREN, WALDEMAR, GRATON, L.C., AND GORDON, C.H., 1910, THE ORE DEPOSITS OF NEW MEXICO: U.S. GEOLOGICAL SURVEY PROFESSIONAL PAPER 68, P. 272-276.}{Production:: HARLEY, 1934, P. 141}
ReporterBlair, Will N., Menzie, David, Peterson, Jocelyn A.