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the original. copper mining got its start in earnest in butte in 1878 with the construction of this first copper mine. drilled down to a depth of 3569 feet the mine was in operation until 1940.
this sample of chromite also know as iron chromate (fecr 2 o 4) is from a lens of ore in the arundel corporations's delight serpentine quarry located in reisterstown maryland.the calhoun chromite mine of the tyson mining company was located on the quarry site and last operated around 1880.
cluded at least 40 recorded mining sites (pearre & heyl the history of chromite mining in pennsylvania and maryland pa. geol. surv. i. c. 14 1 959). chromite the ore mineral for chrome was first mined in the area in 1808 and active production continued from various mines in the district until the early 1900's.
domestic mining for chromite was restricted to a few locations in the united states including montana california and oregon and mining the mineral was only economically feasible during times of political conflict. during wartime the united states government supported domestic production with price supports and strategic stockpiling programs.
chromite is important because it is the only economic ore of chromium an essential element for a wide variety of metal chemical and manufactured products. many other minerals contain chromium but none of them are found in deposits that can be economically mined to produce chromium. chromite deposits that are large enough for mining are
chromite today is mined particularly to make stainless steel through the production of ferrochrome (fecr) which is an iron-chromium alloy. chromite grains are commonly found in large mafic igneous intrusions such as the bushveld in south africa and travancore in india.