Underground mine service and support workers perform a wide range of mining activities related to the operations of orepasses, chutes, and conveyor systems; the construction and support of underground structures, passages, and roadways; and the provision of materials/supplies. They operate bulldozers, graders, and diesel/electric track haulage equipment.

Oil and gas drilling workers operate and maintain drilling machinery and service rig machinery equipment such as drilling mud systems/pumps, diesel motors, transmissions, and other mechanical equipment as well as perform other activities as intermediate members of drilling rig crews.

Oil and gas well services operators drive trucks and operate specialized hydraulic pumping systems to place cement in wells and to treat wells with chemicals, sand mixtures, and gases to stimulate production.