Lead and zinc deposit industrial indicators general requirements table

project

Sulphide ore

Mixed mine

Oxidized ore

Pb

Zn

Pb

Zn

Pb

Zn

Boundary grade (ωB)%

1.3 to 0.5

0.5 to 1

0.5 to 0.7

0.8 to 1.5

0.5 to 1

1.5~2

Minimum industrial grade (ωB)%

0.7 to 1

1 to 2

1 to 1.5

2 to 3

1.5~2

3 to 6

Average grade of the deposit (ωB)%

5~8

6 to 9

10~12

Minimum recoverable thickness m

1 to 2

1 to 2

1 to 2

Stone removal thickness m

2 to 4

2 to 4

2 to 4