Mountain View Mine
The Mountain View Mine is near Nye, Montana. Historically the site has been associated with the Stillwater Mining District which is now part of the Custer National Forest. The site was first discovered in 1886. The Mountain View Mine was closed at the time of data entry with no known plans to re-open. Mine operations consist of 2 distinct underground workings. Underground features include 2 shafts and 10 adits. Subsurface depth reaches a maximum of 300 meters (984 feet) and extends 10,000 meters (32,808 feet) in length. The mining method is overhand shrinkage. Mine capacity in 1988 was 1988 mt ore/day with a production unit cost of 25.75 $/mt ore. The ore mined is composed of bronzite and chromite with waste material consisting primarily of olivine. As of 1983 there was one documented tabular shaped ore body extending 914 meters (2,998 feet) long, 503 meters (1,650 feet) wide, and 4 meters (13 feet) thick. Associated rock in this area is quartz monzonite from the Neoarchean era 2.80 to 2.50 billion years ago. The Middle Rocky Mountains physiographic province of the Rocky Mountain System characterize the geomorphology of the surrounding area.
Site identification and general characteristics. Learn about USGS mines.
Additional textual information about a site or mine.
ORE BODY TYPE IS ORIGINAL ROCK FORMER (A MAGMATIC DIFFERENTIATE ). THE MOUAT MINE CONSISTS OF TWO PARALLEL ORE BODIES OR ZONES, THE G & THE H. THESE ZONES OR LAYERS ARE MINED SIMULTANEOUSLY. THE G LAYER AVERAGES 2. 7M. (9FT) THICK AND THE H LAYER 1. 7M (5. 5FT) THICK. TYPE OF WALL ROCK ALTERATION IS SERPENTINIZATION.
MAJOR ORE DEPOSITS IN G AND H CHROMITITE ZONES OF PERIDOTITE MEMBER OF STILLWATER COMPLEX. G BAND AVERAGES 16 FEET THICK, 21. 5% CR2O3; H AVERAGES 5. 8 FEET THICK, 22. 1% CR2O3. DEPOSIT IS CUT BY LAKE AND CLIFF FAULTS.
Formal or informal mining district names.
Workings at the site.
UNDERGROUND MINING IS EXPECTED TO RESULTS IN MINIMAL SURFACE DISTURBANCE. SURFACE FACILITIES WOULD LIKELY BE RESTRICTED TO PREVIOUS MINE SITES, ROADS, ETC. MINE ROAD DISTANCE IS 8KM. WATER SUPPLY DISTANCE IS 5KM. ELECTRICAL SUPPLY SOURCE IS 21KM.
Processes that concentrated or enriched the mineralization of the mine.
DEVELOPMENT AND PRODUCTION HISTORY OF MOUAT MINE AS REPORTED BY THE AMERICAN CHROME COMPANY (OPERATOR FROM 1953 TO 1961) : 1941-1943 DEVELOPMENT-UNDERGROUND, 11783 METERS PRODUCTION-MINED, 166200 TONNES AT 21. 64 PERCENT CR2O3 MILLED, 70, 485 TONNES AT 19. 26 PERCENT CR2O3 CONCENTRATES, 26, 796 TONNES AT 38. 81 PERCENT CR2O3 1953-1961 DEVELOPMENT-UNDERGROUND, 18, 382 METERS PRODUCTION-CONCENTRATES, 860, 000 TONNES AT 38. 57 PERCENT CR2O3.
CR:IRON RATIO APPROX 1. 7:1 ANALYSIS OF THE MOUAT MINERAL CHROMITE IS: 44. 3 PERCENT CHROMIC OXIDE 17. 6 PERCENT IRON 20. 6 PERCENT ALUMINA 12. 8 PERCENT MAGNESIA 0. 7 PERCENT SILICA 0. 7 PERCENT CALCIUM OXIDE.
THE STILLWATER COMPLEX IS EXPOSED ALONG THE NORTHERN MARGIN OF THE BEARTOOTH UPLIFT, ONE OF SEVERAL LARAMIDE BASEMENT-CORED RANGES THAT MAKE UP THE ROCKY MOUNTAIN FORELAND OF SOUTH-CENTRAL MONTANA (FOOSE AND OTHERS, 1961: KULIK AND SCHMIDT, 1988 ); REG. TRENDS: STRIKE OF ULTRAMAFIC ZONE: N 60 DEG. W-N 80 DEG. W.
THE LARGEST POTENTIAL RESOURCES OF CHROMIUM AND PGE IN THE U. S. OCCUR IN THE STILLWATER COMPLEX. AGE OF STILLWATER COMPLEX IS 2, 705 +/-4 MA BASED ON U-LEAD SYSTEMATICS ON ZIRCON-BADDELEYITE (PREMO AND OTHERS, 1990 ); AGE OF HOST ROCKS: PRE-CAMBRIAN; STILLWATER COMPLEX.
TECTONIC SETTING AT TIME OF EMPLACEMENT OF THE STILLWATER COMPLEX IS UNKNOWN. THE COMPLEX WAS EMPLACED SHORTLY AFTER A MAJOR REGIONAL, SUBDUCTION-RELATED MAGMATIC EVENT THAT CULMINATED IN EMPLACEMENT OF THE 2. 73-2. 79 GA GRANITOID SUITE IN THE BATHOLITH EXPOSED IN THE BEARTOOTH UPLIFT (WOODEN AND OTHERS, 1991 ). HOWEVER, THERE IS NO EVIDENCE THAT THE MAGMATISM THAT FORMED THE STILLWATER COMPLEX IS RELATED TO CONVERGENT MARGIN TECTONICS AND MAGMATISM.
Characteristics of the ore body.
Geological materials at the site.
Geologic structural features affecting or characterizing the site or mine.
Physiographic area where the resource is found.
Mineralogical and chemical alteration at or near the site, which may help to indicate the geographic extent of the geological processes producing the mine.
Mineral rights ownership information.
Controls on emplacement of ore such as faults or other structural features.
GRADE IS REPRESENTATIVE OF MINE DILUTION CR:IRON RATIO APPROX 1. 7:1.
DEPOSIT REPORT. UPDATED IN 1987/88-COSTING INCLUDED FECR SMELTER CONSTRUCTION IN COLUMBUS, MONT. 1993 RESERVES FROM RANDOL 1993/94.
Other deposits in the same region.
Mouat Chromium Mine
Mountain View Cr-Pt Platinum Occurrence
Mouat Nickel-Copper Nickel Prospect
Mouat Nickel-Copper Copper Prospect
Mouat Nickel-Copper Copper Occurrence
Stillwater Pgm Mine
Dow Palladium Occurrence
Initial Cr-Pt Platinum Occurrence
Intial Nickel-Copper Copper Occurrence
Nye Basin-Lip Chromium-Platinum Prospect
* Mine bounds on map indicate the general area that a mine occupies. For an detailed map, refer to the overseeing BLM field office.
** The mine central point is based on an average of the mine's bounding box(es) and does not necessarily fall on the claim itself.
1 World-class significance is determined by total endowment of the contained commodity. This includes all past production and remaining reserves. Each commodity is considered separately and commodities cannot be combined to arrive at a significant size. The tonnage thresholds are from the mine model grade-tonnage studies. As of June 2008, many entries were classified as significant under less strict rules.
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OTHER NAME: MOUAT-SAMPSON. PART OF STILLWATER COMPLEX.