Environmental Impacts of Sand and Gravel Operations in
2013-3-15 · Environmental Impacts of Aggregate and Stone Mining New Mexico Case Study Prepared By Steve Blodgett, M.S. ... like perlite and silica flux, create extremely fine particles of silica that can ... aggregate and sand mining involve the excavation, crushing, and screening of rocks that are predominantly Al-Mg-Fe-silicates, except for limestone and ...