192 192 Pregrobbing Characteristics of Gold Ores in Ghana Adam Mustapha Richmond Komla Asamoah Grace OforiSarpong Richard Kwasi Amankwah1 Mineral Engineering Department University of Mines and Technology Tarkwa Ghana
Auriferous Chalcopyrite A specimen of chalcopyrite with pyrrhotite from the Rouyn District Quebec Canada. Some chalcopyrite contains enough gold or silver that it can be an ore of those metals without considering the copper content.
The characteristics of gold ores change with time during exploitation from freemilling to refractory and double refractory gold ores. This prevents extraction of the minerals of interest in sufficient quantities for profitability. The main constituents of the ore that render it refractory and
Specimens of gold which is a form of gold with a mineral carrier or quartz and has a size of metallic ore which is almost the same as free gold. Where the gold grains are visible with the naked eye either intergrown with gangue in primary deposits or as a loose item in secondary deposits.