Quarrying Specialist
Moves earth, rock, and materials with heavy machinery to provide foundations for airfields, roads, dams, and buildings; operates powered machines to excavate, clean, crush, drill, and grade site layouts; detonates explosives to clear rock; operates and maintains air compressors, pneumatic tools, hydraulic-powered rock drills, rock crushers, and screening equipment; operates ancillary equipment such as generators, conveyors, light sets, and pumps.
12G Quarry Specialist
Directs the erection of rock processing equipment; determines screen sizes and crusher settings to produce aggregate to specifications; directs quarry rock excavation to produce required sizes and tonnage of rock; performs as blaster; operates rock drills under supervision; assembles, adjusts and operates crushing, screening, conveying, and washing units; assists in blasting operations; assists in performance of combat engineer missions.
MOS 12G - Quarrying Specialist (National Guard Only)
Major Duties. The quarrying specialist supervises or operates electric, pneumatic, and internal combustion powered machines used in drilling, crushing, grading, and washing gravel aggregate for construction projects. Detonates explosives to blast rock in quarries and construction sites. Duties for MOS 12G at each level of skill are:
MOSC 12G10. Performs Preventive Maintenance Checks and Services (PMCS); assembles, adjusts, and operates the Crushing, Screening, Washing Plant (CSWP); performs PMCS on and operates rock drills; loads boreholes with explosives and assembles nonelectrical firing circuits.
MOSC 12G20. Supervises PMCS of Crushing, Screening, Washing Plant (CSWP) and rock drills; supervises assembly, adjustment, calibration, and operation of CSWP in the production of aggregate for construction projects; supervises drilling of blast patterns and loading of boreholes; detonates explosives to excavate quarry rock.
MOSC 12G30. Supervises rock production operations; directs the production of crushed, washed, and graded aggregate; designs, plans, and conducts subsurface demolition operations; plans and directs the quarry layout and plant setup.
