Al master alloys Al-Ni alloys Chalcopyrite ELZPA ore deposit in Pakistan Hydrometallurgical processes Research & information: general U neutral leaching alumina silica mass ratio aluminothermic reactions arsenic arsenopyrite ascorbic acid catalysis clays contaminated groundwater desilication rate dry digestion electrowinning eudialyte geochemical characteristics gold groundwater high alumina fly ash hydrometallurgical processes iodide iodine kinetics leaching leaching kinetic low-pressure leaching