This study evaluated sources of airborne quartz and research control methods that would assist underground mine operators in complying with respirable dust standards that had been reduced because of quartz in the dust exceeding 5%. The work involved (1) evaluating sources of quartz dust at the roof bolter work location, (2) evaluating the relationship between the quartz content of the coal and adjoining rock strata and quartz exposure at the roof bolter and continuous miner locations, and (3) conducting laboratory tests to determine performance parameters for roof bolter dust collector systems. Underground surveys were conducted. The continuous miner typically was the greatest source of quartz exposure for the miner and roof bolter operators when single-split ventilation was utilized. A statistically significant relationship between quartz content in face material and operator exposure was not determined; data suggested that mining equipment and procedures may be more critical. The lab tests indicated the use of dust hog-type bits, filter cartridges, maximized collector airflow, and reduced bit revolutions per minute should be utilized to minimize dust liberation at the roof bolter.
We take your privacy seriously. You can review and change the way we collect information below.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
Cookies used to make website functionality more relevant to you. These cookies perform functions like remembering presentation options or choices and, in some cases, delivery of web content that based on self-identified area of interests.
Cookies used to track the effectiveness of CDC public health campaigns through clickthrough data.
Cookies used to enable you to share pages and content that you find interesting on CDC.gov through third party social networking and other websites. These cookies may also be used for advertising purposes by these third parties.