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Wet Grid Ball Mill For Gold Ore High Outpu

Advance gateate road that is driven simultaneously with the longwall coal face, when the advan cing longwall technique is used, but which is maintained some 10 to 20 yd 9 to 18 m or more in advance of the facehe area immediately ahead of the coal face is therefore preexplored, and steps can be taken to cope with minor disturbances and thus prevent a serious loss of outpu t.

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