the leadville mining district, located in the colorado mineral belt, was the most productive silver-mining district in the state of colorado and hosts one of the largest lead-zinc-silver deposits in the world. oro city, an early colorado gold placer mining town located about a mile east of leadville in california gulch, was the location to one of the richest placer gold strikes in colorado .
everything about the old lead industry, from the mining of ore to its sale, stemmed from the ancient claim of the monarch to all mineral rights. the whole structure was designed to enable the duchy of lancaster , a royal possession, to collect the king's royalties and, since these were farmed out, the miners paid them to the king's farmer.
galena, also called lead glance, is the natural mineral form of lead sulfide. it is the most important ore of lead and an important source of silver. galena is one of the most abundant and widely distributed sulfide minerals. it crystallizes in the cubic crystal system often showing octahedral forms. it is often associated with the minerals sphalerite, calcite and fluorite.
the broken hill ore deposit is located underneath broken hill in western new south wales, australia, and is the namesake for the town.it is arguably the world's richest and largest zinc-lead ore deposit.
with the recommencement of copper mining, total ore production doubled from the mining operations doubled from the 660,000 t/y level that had been maintained since production began in 1931. both the copper and lead-zinc ores were treated in separate circuits in the same concentrator, which was later referred to at the 'no. 1 concentrator'.
the mine operated from at least 1863 to 1902 to mine lead ore and from 1971 to 1972 and from 1979 to 1980 to mine fluorspar . lead mining. one of the first publications about the cornish hush mine described a fatal accident, in which miner john collinson was buried underneath a large amount of rocks and lead ore falling onto him during his work .
mining and milling of ore produced more than 500 million tons of wastes in the tri-state area and about 250 million tons of wastes in the old lead belt. more than 75 percent of this waste has been removed, with some portion of it used over the years. today, approximately 100 million tons of chat remain in the tri-state area.