RE: info pages6 Mar 2021 16:36
@cyberiachas - interesting extract from your attached article...
"Copper porphyry deposits are a prime example of how the grade can not be the only consideration when evaluating mine economics. Grades for copper porphyry deposits typically range from 0.2 percent copper to greater than 1 percent, with a median grade of 0.44 percent copper.
Other geological factors can have a large impact on the economic viability of a project. The metallurgical properties of this deposit type also make for lower cost mining operations.
“Copper porphyry deposits, despite their low to medium grades, are highly attractive to major producers for a variety of reasons, including their polymetallic nature, massive size and ease of mining. The ore is relatively inexpensive to mill and concentrate using flotation methods, heap leaching and electrowinning processes. These deposits are typically amenable to large-scale, low-cost operations using bulk-mining and milling or heap-leaching methods,” David Watkinson, P. Eng, president and CEO of Emgold Mining"
ATB Shorn