Butte Field Office 106 North Parkmont Butte, MT 59701
Take Exit 241 (Pipestone) from I-90 and travel east on a gravel road (parallels interstate) for about three-fourths of a mile, then turn north on a gravel road, cross the railroad tracks and continue north for approximately 3.5 miles. A high clearance vehicle is necessary.
This unique geological formation is located approximately 18 miles east of Butte and north of I-90. The rocks in this unique geologic area chime when tapped with a hammer.