Low grade ores – Smelt, leach or concentrate?
2010-1-1 · The ore is typically crushed to about 6–13 mm prior to stacking into heaps. The effect of declining ore grades on embodied energy for heap leaching of copper sulphide ore is shown in Fig. 9 and Table 3, Table 4. Download : Download full-size image; Fig. 9. Effect of ore grade on the embodied energy of copper production (heap leaching).