Quartz Dust Sources During Overburden Drilling At Surface Coal Mines.
Ann Am Conf Govt Ind Hyg 1986 Jul; 14:361-366
This report describes the results of a Bureau of Mines study of the main quartz dust sources during overburden drilling at a surface coal mine. Respirable quartz dust sources were identified and evaluated as well as their relative contribution to dust hazards during dry drilling operations. Both personal gravimetric and instantaneous (ram-1) dust sampling devices were used to estimate the respirable dust levels in the vicinity of the sources. No attempt was made to determine actual source emission strengths. Results indicate that the drill rig has three major dust generating sources during the dry drilling operations: the collector dump, drill shroud leakage and drill stem seal leakage. These sources contributed up to 90% of the total respirable dust and 89% of the total respirable quartz dust generated during drilling.
Ann. Am. Conf. Govt. Ind. Hyg., V. 14, July 1986, PP. 361-366