rate of basalt rock to be used in the crusher plan
2018-8-3 · Blue metal crusher dust is left over at quarries when they are crushing blue metal (volcanic basalt) rock to be used on bitumen roads. The road constructors buy all of the suitably sized gravel. The ''dust'', which contains about 80% dust and 20% fine grit up to 4mm in size, is sold for use …
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