A report commissioned by Alexander Mining examining the construction and running of a typical 50,000 t/y and 100,000 t/y copper/cobalt mine in the Democratic Republic of the Congo (DRC) using its AmmLeach® process, compared with conventional sulphuric acid, has shown “substantial capital and operating cost savings” according to CEO Martin Rosser. AmmLeach uses ammonia-based chemistry under ambient conditions to selectively extract base metals. (more…)