Sources of Exposure to Asbestos, Gases and Vapors

Read the U.S. Department of Labor (DOL) and the Mine Safety and Health Administration (MSHA) report about the sources of exposure to asbestos, gases and vapors.

Gases can be formed in pockets in the rock by natural processes and then seep out into the mine air through cracks in the rock. Under certain conditions, these gases may accumulate into hazardous concentrations in local areas.

The most common naturally occurring contaminant gases encountered in mining are methane, hydrogen sulfide, and radon.

Toxic gases and vapors are routinely produced by many processes in the mining industry. Toxic and asphyxiant gases can be created by welding operations, combustion, and blasting. Exhausts from fuel-burning engines contain large amounts of toxic gases.

Toxic vapors are usually found in the mineral process areas where liquid reagents are used. Vapors may be encountered around solvent cleaning operations, painting, fuel storage areas, maintenance shops, chemical storage areas, and certain reagent mixing areas.

The danger from toxic gases and vapors can be encountered anywhere that they can settle or collect. In addition, toxic gases can be formed accidentally when contaminants react with the ore, with moisture, or with each other.

Often the accidental production of a toxic gas can be anticipated and precautions taken to minimize adverse effects.

Courtesy of MSHA

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