Bluebird Chromium Occurrence
The Bluebird Chromium Occurrence is near Limestone, Montana. Historically the site has been associated with the Stillwater Mining District which is now part of the Gallatin National Forest. The site was first discovered in 1939. Ore mineralization has been found at this location and the size of the deposit is estimated to be small, however the precise grade, tonnage, and extent of the mineralization are not known. There has been no production and little to no activity other than routine claim maintenance since the mineral discovery. The ore mined is composed of chromite with waste material consisting primarily of olivine. The ore body has a lenticular or lens shaped form 457.20 meters (1,500.00 feet) long and 0.98 meters (3.22 feet) thick. The host rock in this area is peridotite from the Lower Cretaceous epoch 145.00 to 100.50 million years ago. The Middle Rocky Mountains physiographic province of the Rocky Mountain System characterize the geomorphology of the surrounding area.
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PROSPECT PITS AND TRENCHES
Processes that concentrated or enriched the mineralization of the mine.
AGE OF STILLWATER COMPLEX IS 2, 705 +/-4 MA BASED ON U-LEAD SYSTEMATICS ON ZIRCON-BADDELEYITE (PREMO AND OTHERS, 1990).
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Physiographic area where the resource is found.
Controls on emplacement of ore such as faults or other structural features.
Other deposits in the same region.
Bluebird Cr-Pt Chromium Occurrence
Bluebird Nickel-Copper Copper Occurrence
Intial Nickel-Copper Copper Occurrence
Initial Cr-Pt Platinum Occurrence
West Fork East Adit
Dow Palladium Occurrence
Groundhog Chromium Mine
West Fork Group
West Fork Cr-pt Tuttle Chromium Occurrence
West Fork Palladium Occurrence
* 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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UNSURVEYED. IN CUSTER NATIONAL FOREST.
ON WEST SIDE OF CATHEDRAL CREEK. DEPOSIT ALONG NORTH SLOPE OF BLUEBIRD PEAK.