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U. S. Small Business Administration

U. S. Small Business Administration

U. S. Small Business Administration . Table of Small Business Size Standards . ... Primarily by Machine 115114 . Postharvest Crop Activities (except Cotton Ginning) ... Crushed and Broken Limestone Mining and Quarrying . 750 : 212313 . Crushed and Broken Granite Mining and Quarrying : 750 .

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lime safety dust for coal mining Carmeuse

lime safety dust for coal mining Carmeuse

Milled limestone, referred to as "rock dust" by the coal industry, is an additive used for safety in underground bituminous coal mines. The particles of the milled limestone mix with coal dust to prevent a potential explosion. Rock dust is blown or sprayed (as a slurry) onto the roof, ribs and floor of the mine, and needs to be reapplied on a regular basis to maintain its effectiveness.

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