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stone coal strength

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stone coal strength

determination of intact coal strength thus becomes unnecessary for wide pillars an average seam strength of 62 to 66 MPa may suffice for most US bituminous coal seams Rock partings within the coal seam however were found to have a variable effect on pillar strength depending on the parting strength A competent shale parting within ... As a leading global manufacturer of crushing equipment, milling equipment,dressing equipment,drying equipment and briquette equipment etc. we offer advanced, rational solutions for any size-reduction requirements, including quarry, aggregate, grinding production and complete plant plan.

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