Located on the slopes of Mount Jasper on the north side of the city, it includes one of the only known evidences of mining by pre-Contact Native Americans in the eastern United States.

The site, owned by the city of Berlin, encompasses a triangular area from the summit to points on the Dead River.

Its principal features include one or more short mine shafts that follow the seams of rhyolite in the upper reaches of the mount, and workshop areas at both the summit and river-facing base of the mountain.

While the deepest mine is 9 metres (30 ft) deep, there is ample evidence that other exposed seams of rhyolite were extensively quarried.

Evidence from this and other sites indicates that it was a source of stone for tools as much as 9,000 years ago, and it is unique in the eastern United States in that the natives working the quarry actually tunneled into the mountain.