Reply to "Open Pit Mine 1941"

Both Copper and steel are processed heavily from scrap metal.  Steel/pig iron from blast furnaces, which require iron ore, is still done.  Impurities from/in scrap a problem.    Environmental problems associated with coke ovens, blast furnace also limit this process.  Recent air quality concerns, Edgar Thompson works, along the Monogahela River, Pittsburgh.  

 

Last edited by Mike CT
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