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Big Belt Mountains
Mt. Baldy Big Belts.jpg
Mt. Baldy and the Big Belt range near Townsend, Montana
Highest point
Peak Mount Edith
Elevation 9,504 ft (2,897 m)
Length 75 mi (121 km)
Big Belts.JPG
Country United States
State/Province Montana
Range coordinates 46°27.25′N 111°15.9′W / 46.45417°N 111.2650°W / 46.45417; -111.2650
Parent range Rocky Mountains

The Big Belt Mountains are a section of the Rocky Mountains in the U.S. state of Montana. Situated mainly in the Helena National Forest, the mountains are used for logging and recreation for the surrounding residents. Nearby is Helena, Montana, Canyon Ferry Lake, the Missouri River, Townsend, Montana, and White Sulphur Springs, Montana. The highest point in the Big Belt Range is Mount Edith at 9,504 feet (2,897 m) while the center of the range is 7,385 feet (2,251 m)

The Big Belts lie primarily between the Missouri River drainage to the west and the Smith River drainage to the east. Today, they are traversed by U.S. Highway 12 between Townsend, Montana in the Missouri drainage, and White Sulphur Springs, Montana in the upper Smith River drainage.

The gulches on the western slopes of the Big Belts were noted historically for rich gold placer strikes. The richest was the 1864 and 1865 placer gold strikes in Confederate Gulch, including Montana Bar, which was one of the most concentrated gold placer strikes ever made.

The range takes its name from the fact it is situated in a long belt-like arc. It stretches 75 miles, making it a mid-length subrange of the Rocky Mountains. To the east are the Little Belts and to the south, somewhat continuing this arc, are the Bridger Mountains.

The Belt Supergroup series of rocks, which are primarily Precambrian mudstones, were named after this mountain range and the adjacent Little Belt Mountains. A particularly well-known example of exposed Belt Group mudstones in alternating purplish-red or pale bluish-green layers in the Big Belt Mountains is in Wolf Creek Canyon along Interstate 15 between Helena and Great Falls. While these rocks were named after these ranges of western-central Montana, and are found in them, they are more exposed and better known in northwestern Montana, northern Idaho, and southeastern British Columbia, namely around Flathead Lake, Glacier National Park.

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