Panayotova, M. ., and V. . Panayotov. “COPPER RECOVERY FROM LOW GRADE ORES, CONCENTRATES AND TECHNOGENIC WASTE BY AMMONIA LEACHING - AN OLD IDEA WITH PROMISING FUTURE: COPPER RECOVERY FROM LOW GRADE ORES, CONCENTRATES AND TECHNOGENIC WASTE BY AMMONIA LEACHING - AN OLD IDEA WITH PROMISING FUTURE”. JOURNAL SCIENTIFIC AND APPLIED RESEARCH, vol. 11, no. 1, Mar. 2023, pp. 10-34, doi:10.46687/jsar.v11i1.210.