Bisbee

Lavender pit: Open pit mining at Bisbee began in 1917 and ended in 1974. The pit is 1200m wide, 1500m long, and 250m deep at its maximum.
More than 300 types…

Nearly a century of production in Bisbee yielded some 4 million tons of copper. The worldwide consumption is now about 17 million tons of copper per year, the…

Large, circular concrete structures are all that remain ofa concentrate thickener, which used a chemical flotation process to separate metal from rock in finely…

The pit was mined by way of: series of 50-foot-high "benches" or steps cut into the edge of the ore deposit.
A: Closely spaced holes were drilled into the…