@bruham
"As some one posted, the grade depends on what the copper is used for.
Low grade copper has it uses."
That statement is nonsensical.
copper = copper = copper
It doesn't matter what the grade of the copper ore is, the valuable mineral is concentrated and smelted or leached and electro-won into 99.999% copper.
@bruham"As some one posted, the grade depends on what the copper...
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