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Mining Engineering Mine Supports And Strata Control Difficulty: Medium

Platinum deposits are

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Protodyakonov strength number is used to denote The face advances towards rise side is possible in longwall, if seam inclination less than. During development the height of the gallery should not exceed A mine fan produces 30 m 3 /s of air at 240 Pa pressure running at 1400 rpm. If the fan speed is increased to 2100 rpm, the pressure in Pa and the quantity in m 3 /s generated by the fan will be Mesh size of flame safety lamp is