Technological Feasibility of Controlling Asbestos and Silica at Mines and Mills. Volume 2. Appendixes

摘要

Exposure profiles for respirable silica dust in 15 mining industry groups that were prepared from the 1977-1981 Mine Safety and Health Administration (MSHA) MIDAS files are presented as probability distribution graphs in this appendix. The dust exposure data have been organized into data sets according to industry group, operation category, and location (surface and underground) as discussed in Volume I, Chapter 2 of this report. There are 15 industry groups: copper, gold and silver, iron, lead and zinc, molybdenum, uranium, other metals, limestone, other stone, clay and shale, asbestos, talc, oil shale, sand and gravel, and other nonmetals. Operation and location are classified into 14 categories: surface drilling; underground drilling, blasting, cutting and boring; surface production; surface mobile transport; surface haulageway maintenance; underground production; underground mobile transport; underground haulageway maintenance; crushing, grinding, and sizing; concentrating and finishing; nonspecific surface; and nonspecific underground.