Near Drummond in Granite County, Montana — The American West (Mountains)
Madison Limestone and the Garnet Mountains
About 75 million years ago molten rock intruded the area near the crest of the Garnet Range, seven miles north of this rest area. Northwest-trending faults and rock layers channeled mineral-rich fluids from the intrusion into Cambrian and Precambrian rocks to
- Where the magma contacted the Madison Limestone, it caused a chemical reaction called a skarn that formed the garnets found in the range.
- The Garnet area placer mines produced approximately 60,000 ounces of gold, as did the lode mines. Drilling has revealed gold placer reserves under the current rest area, and resources of several hundred thousand ounces of gold still remain in the Garnet Range.
- A mining camp called Beartown was located in a narrow gulch near here. Between 1865 and 1869, miners recovered $30 million in gold and silver from Bear Gulch. As many as 7,000 people lived in camp during its heyday.
- What are some organisms you know of today that are similar to marine organisms whose shells and bodies accumulated
Erected by Montana Department of Transportation.
Location. 46° 43.154′ N, 113° 18.748′ W. Marker is near Drummond, Montana, in Granite County. Marker is on I-90 Frontage Road 1.1 miles east of Bear Gulch Road, on the right when traveling west. Click for map. This marker is not located at the I-90 Bearmouth Westbound Rest Area, but is located on the I-90 Frontage Road which can be accessed from I-90 at Exit 138 and Exit 153 (Drummond). Marker is in this post office area: Drummond MT 59832, United States of America.
Other nearby markers. At least 2 other markers are within 9 miles of this marker, measured as the crow flies. Rattler Gulch Limestone Cliffs ACEC (approx. 3.9 miles away); Sand Park Cemetery (approx. 8.6 miles away).
More about this marker. There is an identical marker located at the I-90 Bearmouth Eastbound Rest Area. The references to rest area in the marker text inscription are to this rest area which is located west of the Madison Limestone outcropping and this marker.
Categories. • Environment • Industry & Commerce • Settlements & Settlers •
Credits. This page originally submitted on , by Duane Hall of Abilene, Texas. This page has been viewed 401 times since then and 18 times this year. Photos: 1, 2, 3. submitted on , by Duane Hall of Abilene, Texas. This page was last revised on June 16, 2016.
Editor’s want-list for this marker. Photograph with wide-view of marker and surroundings. • Can you help?