Definitions

PURPOSE: This rule defines those terms used by the inspection section, Division of Labor Standards in the rules establishing standards for safe practices in the mining industry. (1) Active workings means any place in any mine where miners normally work or travel. (2) ANFO means ammonium nitrate-fuel oil mixtures. (3) Approved means tested and accepted for a specific purpose by a nationally recognized safety agency. (4) Barricaded means obstructed to restrict the passage of persons, vehicles, or flying materials. (5) Berm means a pile or mound of material capable of restraining a vehicle; also a shelf, ledge, or material placed to contain loose slope material. (6) Blasting agent means a cap insensitive chemical composition or mixture consisting of fuel and oxidizer and no explosive ingredient but which can be made to detonate when initiated with a high strength explosive primer. (7) Blasting area means the area near blasting operations in which concussion or flying material can reasonably be expected to cause injury. (8) Blasting cap means a detonator containing a charge of detonating compound, which is ignited by electric current or the spark of a fuse; used for detonating explosives. (9) Blasting circuit means electric circuits used to fire electric detonators or to ignite an igniter cord by means of an electric starter. (10) Blasting switch means a switch used to connect a power source to a blasting circuit. (11) Box-type magazine means a small, portable magazine used to store limited quantities of explosives or detonators for short periods of time in locations at the mine which are convenient to the blasting sites at which they will be used. (12) Capped fuse means a length of safety fuse to which a detonator has been attached. (13) Capped primer means a package or cartridge of explosives which is specifically designed to transmit detonation to other explosives and which contains a detonator. (14) Combustible means capable of being ignited and consumed by fire. (15) Director means director of the Division of Labor Standards. (16) Company official means a member of the company supervisory or technical staff. (17) Competent person means a person having abilities that fully qualify him/her to perform the duty to which s/he is assigned. (18) Department means Department of Labor and Industrial Relations. (19) Detonating cord or detonating fuse means a flexible cord containing a core of high explosive. (20) Detonator means a device containing a small detonating charge that is used for detonating an explosive, including, but not limited to, blasting caps, exploders, electric detonators, and delay electric blasting caps. (21) Distribution box means a portable apparatus with an enclosure through which an electric circuit is carried to one (1) or more cables from a single incoming feedline; each cable circuit being connected through individual overcurrent protective devices. (22) Electric blasting cap means a blasting cap designed for and capable of being ignited by means of an electric current. (23) Electric grounding means to connect with the ground to make the earth part of the circuit. (24) Employee means a person who works for wages or salary in the service of an employer. (25) Employer means a person or organization employing one (1) or more persons to work for wages or salary. (26) Explosives means any chemical compound, mixture, or device, the primary or common purpose of which is to function by explosion. Explosives include, but are not limited to, black powder, dynamite, nitroglycerin, fulminate, and ammonium nitrate when mixed with a hydrocarbon plus high explosive ingredients. (27) Face-to-wall means that part of any mine where excavating is progressing or was last done. (28) Flammable means capable of being easily ignited and of burning rapidly as defined by the National Fire Protection Association. (29) Highway means any public road or travelway used by the general public. (30) Igniter cord means a fuse, cordlike in appearance, which burns progressively along its length with an external flame at the zone of burning and is used for lighting a series of safety fuses in the desired sequence. (31) Inhabited building means a building regularly occupied in whole or in part as a habitation for human beings or any church, schoolhouse, railroad station, store, factory, or other structure where people are accustomed to assemble except any building or structure occupied in connection with the manufacture, transportation, storage, or use of explosives. (32) Low voltage means electric potential up to and including 660 volts, medium voltage means voltages from 661 to 1000 volts, and high voltage means more than 1000 volts. INDUSTRIAL RELATIONS (33) Magazine means a storage place for explosives or detonators. (34) Major electrical installation means an assemblage of stationary electrical equipment for the generation, transmission, distribution, or conversion of electric power. (35) Misfire means the complete or partial failure of a blasting charge to explode as planned. (36) Overburden means material of any nature, consolidated or unconsolidated, that overlies a deposit of useful materials or ores that are to be mined. (37) Primer or booster means a package or cartridge of explosives which is designed specifically to transmit detonation to other explosives and which does not contain a detonator. (38) Reverse-current protection means a method or device used on direct current circuit equipment to prevent the flow of current in the reverse direction. (39) Roll protection means a framework or safety canopy to protect the vehicle operator if equipment should overturn. (40) Safety can means an approved container, of not over five (5) gallon capacity having a spring-closing lid and spout cover. (41) Safety fuse means a train of powder enclosed in cotton, jute yarn, and water-proofing compounds which burn at a uniform rate; used for firing a cap containing the detonating compound which in turn sets off the explosive charge. (42) Safety switch means a sectionalizing switch that also provides shunt protection in blasting circuits between the blasting switch and the shot area. (43) Scaling means removal of insecure material from a face or highwall. (44) Secondary safety connection means a second connection between a conveyance and rope, intended to prevent the conveyance from running away or falling in the event the primary connection fails. (45) Semiconductive hose means hose having an electrical resistance of not less than five thousand (5000) ohms per foot and not more than two (2) megohms for its total length, used in pneumatic placement of blasting agents in boreholes. (46) Sprung hole means a blasting hole chambered or enlarged to take an increased charge of explosives. (47) Stemming means the inert material and the placing of such material, on top of any charge of explosives. (48) Stray current means that portion of a total electric current that flows through paths other than the intended circuit. (49) Substantial construction means construction of such strength, material, and workmanship that the object will withstand all reasonable shock, wear, usage, and deterioration to which it will normally be subjected. (50) Suitable means that which fits and has the qualities or qualifications to normally meet a given purpose, occasion, condition, or function or circumstance. (51) Travelway means a passage, walk, or way regularly used and designated for persons to go from one (1) place to another while at work. (52) Wet drilling means the continuous application of water to the back or bottom of the drill holes while drilling. (53) Working place means any place in or about a mine where work is being performed. AUTHORITY: sections 286.060 and 293.630, RSMo 2016.* Original rule filed Dec. 18, 1975, effective Dec. 28, 1975. Amended: Filed June 19, 2018, effective Jan. 30, 2019. *Original authority: 286.060, RSMo 1945, amended 1947, 1980, 1995, 2011 and 293.630, RSMo 1959.