The mining boom that swept the west in the late 1800s
Black Hawk mine near Blue Hill was the largest producer, it was an underground mine and in 1972 and 1977, it produced an estimated 1, 000, 000 tons of zinc-copper-lead ore, however metals were not mined in Maine since 1977. 5 to 3 million tons of high grade copper-zinc ore and although there is a →