Table 3 Blastability classification of rocks in the mining area.

From: Study on the law of ore dilution and loss and control strategies under brow line failure in sublevel caving mining

Brittleness index

Blastability classification

Blastability description

Lithology

B ≤ 0.3

I

Easy to blast

Amphibole plagiogneiss

0.3 < B ≤ 0.4

II

Relatively easy to blast.

Magnet-bearing gneiss

0.4 < B ≤ 0.5

III

Medium to blast

Granite

0.5 < B ≤ 0.6

IV

Relatively difficult to blast

Garnet magnetite quartzite, Pyroxene plagio-gneiss

B > 0.6

V

Difficult to blast

Biotite plagiogneiss

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