how small can a iron smelting plant be - essentialgap.co.za- smelting iron ore on a small scale ,how small can a iron smelting plant be. Small Scale Iron Ore Smelting Plant - caleau.ca. smelting iron ore on a small scale youtube13 feb 2014 small scale iron ore smelting …Environmental Impacts of Mining and Smelting ...Estimates of releases of mercury into the environment from artisanal/ small scale gold mining range from 400 to 1,102 metric tons/year. 2 3 Airborne emissions from metal mining and smelting in Australia, Canada, and the U.S.