The report describes work directed at defining the potential seriousness of asbestos emissions that result from man's disturbing geological formations in which asbestos occurs as an accessory mineral. An extensive literature search yielded a catalog of all known and probable occurrences of asbestos in the United States. These locations were screened to identify large mining activities which could cause release of asbestos to the atmosphere. Sixteen such sites were identified. Emissions were estimated for these sites, based on production figures and the nature of the operations. Two sites were selected from this group for further characterization based on probable emissions and population density considerations. Ambient air samples were taken at the two sites, using high volume samplers; the samples were analyzed, using electron microscope techniques. The findings are discussed.

Final. "Battelle Columbus Laboratories." "Control Systems Laboratory, National Environmental Research Center." "September 1974." Includes bibliographical references. EPA, Office of Research and Development, NERC-RTP, Control Systems Laboratory. Contract Number: 68-02-0230.