Timbering of mine stope to prevent cave-ins. This type of timbering is called square set. A common image of square set timbering. This is unusual as so many sets are open, suggesting relatively good ground as sets were usually backfilled (gobbed) quickly to prevent ground movement.

Timbering in Stopes Square set Mining Mines Underground Bisbee Wood

City of Bisbee

Bisbee, Arizona

1979.104.197