U.S. Department of Labor Mine Safety and Health Administration Protecting Miners' Safety and Health Since 1978 |
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Table 01. Number of Sand and Gravel Operations in the
[1] Beginning in 1980, independent contractors working on mine property performing mine exploration, development, production, maintenance, repair and construction work were assigned an identification number, and reported to MSHA, and are included in the count of operations. Since 1983, the contractors were separated from the mines. |
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