Grade

Cu ≥ %

Impurity ，≤ %

Pb

Zn

MgO

As

1 st Grade

2 nd Grade

3 rd Grade

4 th Grade

5 th Grade

6 th Grade

7 th Grade

8 th Grade

9 Th Grade

10 th Grade

11 th Grade

12 th Grade

13 th Grade

14 th Grade

15 th Grade

30

29

28

27

26

25

24

23

22

21

20

18

16

14

12

—

—

—

—

—

—

6

6

6

6

6

7

7

8

8

—

—

—

—

—

—

9

9

9

9

9

10

10

10

10

5

5

5

5

5

5

5

5

5

5

5

5

5

5

5

0.3

0.3

0.3

0.3

0.3

0.3

0.4

0.4

0.4

0.4

0.4

0.5

0.5

With discussion

With discussion