Procedures for safe and efficient loading must be set before loading starts. Drill holes must be large enough for cartridges to enter freely. Tamping is done only with wooden rods or plastic poles without exposed metal (nonsparking metal connectors are allowed on jointed poles), violent tamping is avoided and the primer is never tamped. Holes may be loaded only if they will be fired in the coming round, and leftover explosives and detonators go straight back to an authorized magazine. Drilling may not start until old hole butts are checked for unexploded charges, which must be refired first; holes that held explosives may not be deepened; and there is no drilling within 50 feet of a loaded hole whose charge failed to detonate. Holes are checked for depth and condition before loading. Explosives at the blast site and loaded holes may never be left unattended or unprotected. Machines and tools not used for loading are removed from the immediate area before explosives arrive, and equipment may not run within 50 feet of loaded holes; no activity other than loading is allowed in the blast area. Power lines and portable cables are kept a safe distance from explosives being loaded, and the blaster must deenergize and lock out cables near the blast area. Multiple loading crews on a long line of holes must be separated by a practical distance. No explosive may be loaded or used underground where combustible gases or dusts are present. Only IME Fume Class 1 explosives are used, except that Fume Class 2 and 3 are allowed with adequate ventilation. In open work every blast hole is stemmed up to the collar, or far enough to confine the charge. Warning signs with letters at least 4 inches high on a contrasting background must be kept at every approach to the blast area. A bore hole may never be sprung next to or near a loaded hole, flashlight batteries may not be used for springing, and sprung or chambered holes that are not water-filled must cool before loading. The blaster must keep an accurate current record of explosives, blasting agents and supplies used in each blast and an accurate running inventory of every explosive and blasting agent stored on the operation. When blasting agents are loaded pneumatically over electric caps, semiconductive delivery hose is used and the equipment is bonded and grounded.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.