3528784 METHOD FOR PRELIMINARY BENEFICIATION OF CALCAREOUS OXIDIZED COPPER ORES BY FLOTATION OF A HIGH ACID CONSUMING FRACTION CONTAINING LOW COPPER VALUES
3528784 METHOD FOR PRELIMINARY BENEFICIATION OF CALCAREOUS OXIDIZED COPPER ORES BY FLOTATION OF A HIGH ACID CONSUMING FRACTION CONTAINING LOW COPPER VALUES
2015115 exploitation and beneficiation of minerals or copper chrome fluorine iodine lanthanum malachite morganite olivine opal rie