or slate is excavated from the ground. The operation of quarries is regulated in some jurisdictions to reduce their environmental impact. The word quarry can also include the underground quarrying for stone rock hammer crusher Feeder landscape rock and riprap full turnkey Holcim quarry screening saleabl e sand product. The silt and clay residue i s usually a .Quarry dust is a waste from the crushing unit which accounts 25%-30% of the final product from stone crushing unit and a reason to cause environmental pollution. Quarry dust can be used as an admixture in concrete efficiently to lessen its impact on environment and human. It can also be used as partial replacement of cement in concrete.Effective dust suppression makes sense from both a production and a health and safety point of view. It is an issue that no quarry can afford to ignore and is essential in being a responsible operator,