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oct 01, 2002 river sand, comprised predominately of coarse silica, will present less of a respirable dust hazard risk than silica flour, primarily a very fine powder, which would pose a vastly enhanced risk. although the three above-mentioned products may give a similarly high percentage of crystalline silica in the bulk sample, they pose different aug 12, 2019 project: extraction of scrubbed silica sand material: silica sand. capacity: ph. country: indonesia. mineral condition description: raw silica sand contains slime and barren rock, which is up to CM in diameter. customers requirements: wash the mud off and sieve the barren rock out.