The Mammoth Mine is near Pony, Montana. Historically the site has been associated with the South Boulder Mining District which is now part of the Beaverhead National Forest. The site was first discovered in 1870. The Mammoth Mine was closed at the time of data entry with no known plans to re-open. Production size when active was considered to be small. Mine operations consist of underground workings. There is one known shaft. Subsurface depth reaches a maximum of 305 meters (1,000 feet) and extends 5,486 meters (18,000 feet) in length. The ore mined is composed of chalcopyrite, sphalerite and galena. The ore body has a lenticular or lens shaped form extending 91 meters (300 feet) long and 6 meters (20 feet) wide. Associated rock in this area is schist from the Upper Cretaceous epoch 100.50 to 66.00 million years ago. The Northern Rocky Mountains physiographic province of the Rocky Mountain System characterize the geomorphology of the surrounding area.
Additional textual information about a site or mine.
Formal or informal mining district names.
FULLY EQUIPPED MINE; ORE SHOOTS TEND TO TERMINATE ABRUPTLY.
Workings at the site.
18000 FEET OF ADITS AND CROSSCUTS ON 5 LEVELS; 2 SHAFTS, 175 AND 150 FEET DEEP. (1935).
Processes that concentrated or enriched the mineralization of the mine.
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.
ONE DISCHARGING ADIT WAS IDENTIFIED AT THE SITE. THE DISCHARGE SEEPED INTO WASTE ROCK PRIOR TO REACHING SURFACE WATER. A SAMPLE OF THIS DISCHARGE HAD A PH OF 7. 45. NO MAXIMUM CONTAMINANT LEVELS WERE EXCEEDED IN THE ADIT DISCHARGE. AN UNNAMED TRIBUTARY FLOWED THROUGH THE SITE AND DISCHARGED INTO THE SOUTH BOULDER RIVER. OBSERVED RELEASES TO THE SOUTH BOULDER RIVER (SEDIMENT) WERE DOCUMENTED FOR ARSENIC AND COPPER. POTENTIAL SAFETY HAZARDS IDENTIFIED AT THE SITE INCLUDED ONE OPEN SHAFT AND TWO OPEN ADITS.
Controls on emplacement of ore such as faults or other structural features.
Other deposits in the same region.
Mountain Boy Mine
Bonanza Gold Mine
South Boulder River Placer
South Boulder River Placer
Highland Mary Prospect
Atlantic And Pacific Mine
Unnamed Gold Mine
Ben Harrison Fraction Mine
Bozeman Gold Mine
* 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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TWO MINERAL ZONES: EAST SHOOT (MOST PRODUCTIVE ), AND WEST SHOOT, (SEE TANSLEY, 1933).
PROPERTY COULD BE USGS GSC ID# WO13407 AS LISTED IN MILS. SO MAS PROPERITES 0300570564 AND 0300570794, THE LAT/LONG OF THESE OTHER PROPERTIES ARE CLOSE ENOUGH TO CAUSE SOME CONFUSION.