Bulletin, Issue 321

acid mist added aerator agglomerated charge agglomerated open-drainage agglomerated particles autoxidation barren solution blower bornite Bureau of Mines calcine Castle Dome cent Per cent chalcocite chalcopyrite clogging coarse column compartment consumption of acid Copper extraction countercurrent crushing cuprite diameter drainage dust collector extraction of copper ferric iron ferric sulphate ferric sulphate-sulphuric acid ferrous Figure fines flood leaching flow of solution grams per liter head solution heap leaching Hydrometallurgy inch iodine KEYES leaching methods leaching plant leaching tests material native copper obtained Oldright open-drainage leaching open-drainage method OPEN-DRAINAGE TEST operation percolation leaching Pinto Valley pounds precipitation pregnant solution produced pyrite rate of flow reduced regeneration of ferric regenerator cell roaster gas sample slime solvent sponge iron standard sulphate and sulphuric sulphide copper sulphur dioxide sulphuric acid sump surface tailings tank temperature test-plant tion total copper total iron Tucson pilot plant Tucson station test upward percolation vats washing