Ruggles Mine

Ruggles Mine is an open-pit mine that is no longer in operation and has been turned into a tourist attraction. The mine is located 30 miles (48 km) northwest of Concord, in Grafton, New Hampshire, a short distance from Route 4 at the village green. The spacious pit includes tunnels and underground chambers, some of which are filled with water, for exploring. Visitors are allowed to keep any of the various minerals that are to be found on the mine floor or that can be hammered loose from the walls of the pit.^[2]

• http://en.wikipedia.org/wiki/Ruggles Mine