{"data":{"id":"us/30-cfr-75.1300","jurisdiction":"us","citation":"30 CFR 75.1300","heading":"Definitions.","body":"The following definitions apply in this subpart.\nApproval. A document issued by MSHA which states that an explosive or explosive unit has met the requirements of this part and which authorizes an approval marking identifying the explosive or explosive unit as approved as permissible.\nBattery starting. The use of unconfined explosives to start the flow of coal down a breast or chute in an anthracite mine.\nBlasting off the solid. Blasting the working face without providing a second free face by cutting, shearing or other method before blasting.\nInstantaneous detonator. An electric detonator that fires within 6 milliseconds after application of the firing current.\nLaminated partition. A partition composed of the following material and minimum nominal dimensions: 1/2-inch thick plywood, 1/2-inch thick gypsum wall board, 1/8-inch thick low carbon steel and 1/4-inch thick plywood, bonded together in that order.\nOpener hole. The first hole or holes fired in a round blasted off the solid to create an additional free face.\nPermissible blasting unit. A device that has been approved by MSHA and that is used for firing electric detonators.\nPermissible explosive. Any substance, compound or mixture which is approved by MSHA and whose primary purpose is to function by explosion.\nRound. A group of boreholes fired or intended to be fired in a continuous sequence with one application of the firing current.\nSheathed explosive unit. A device consisting of an approved or permissible explosive covered by a sheath encased in a sealed covering and designed to be fired outside the confines of a borehole.\nShort-delay electric detonator. An electric detonator with a designated delay period of 25 to 1,000 milliseconds.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER O—COAL MINE SAFETY AND HEALTH","PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES","Subpart N—Explosives and Blasting"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"709e9af9aac46101e2b04dccd905f116977dca1d7a2a8a698c123fa5d3707b6b","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-75.1204-1","next":"us/30-cfr-75.1301"},"notice":"GroundRules: Original legal text. Not legal advice."}