In copper concentrate, size distribution of rougher concentrate, the amount of locked chalcopyrite particles, and regrinding circuit performance affect the efficiency of further scavenger and cleaner steps. Mineralogy of the locked chalcopyrite particles throughout the rougher section were examined in different size fractions. Results indicated that more than 70% of copper was floated in the first rougher cells, after which copper and pyrite decreased in concentration, while silica increased. It was found that regrinding the concentrate of first rougher and scavenger cells to ?44??m, and the rest of the cells to ?75??m can yield the highest recovery.