Boron deposit reserve ratio required design levels in the table below.

Boron deposit level reserves ratio table

Mine Design Institute B 2 O 3 reserves (10 4 t)

Proportion of reserves at all levels (%)

Class B

Class C

Class D

>20

10-20

70～80

0～20

8~20

5~10

65~80

10~30

2-8

-

60～80

20~40

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1000

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