Chúng ta đều xét trong $100 gam$ quặng $*)Haclopirit:m_{Cu}=\frac{6.64}{184}\approx 2 gam\Rightarrow \%Cu\approx 2\%$
$*)Haclozin:m_{Cu}=\frac{4.(2.64)}{160}=3,2 gam\Rightarrow \%Cu=3,2\%$
$*)Malachit:m_{Cu}=\frac{5(64+64)}{222}\approx 2,88 gam\Rightarrow \%Cu\approx 2,88\%$