Hi Gholamreza, that is an interesting question. As you know, porphyry copper deposits are generally known more for their large size than high grades.

For example, the Resolution Copper, a deep-seated porphyry deposit, has an average grade of around 1.5%.

Similarly, some of BHP’s copper deposits in Latin America, such as those in Chile, have historically had relatively high grades, though these are gradually diminishing. Cheers, Ebrahim