How many rock bolts are used annually in underground mines in Australia?

2007-02-06 21:30:13 · 2 answers · asked by JaminJ 1 in Environment

2 answers

150,000 tonnes, which account for 90% of the ore output of the western world. In addition, it is estimated that there are 6,000 smaller mines each producing less than 150,000 tonnes.

2007-02-06 21:42:18 · answer #1 · answered by richy 2 · 0⤊ 0⤋

212

2007-02-07 05:42:30 · answer #2 · answered by Icarus 6 · 0⤊ 0⤋

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