Quartz and other silica-based materials can be characterized both in terms of whether they are amorphous or crystalline, as well as by their chemical composition. Defining Silica-Based Materials. Now ...

Proposed silica dust rules for coal mines may extend to sand, gravel quarries The federal government is working on regulations for U.S. mines which includes reducing exposure to silica dust for ...

Skyrocketing demand for quartz countertops has increased workers' exposure to silica dust, a chemical compound that causes lung damage. IE 11 is not supported. For an optimal experience visit our ...

Geneva Rock, which has withdrawn an application to expand its mining area at the Point of the Mountain by 73 acres, says it will reapply soon with a new application for a rezone of 18.5 acres.