retreat blasting of pillars

retreat blasting of pillars: Горное дело: взрывание целиков в отступающем порядке (от границ шахтного поля)

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Underground mining (hard rock) — A three dimensional model of an underground mine with shaft access Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals[1] such as ore containing gold … Wikipedia
mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… … Universalium
Mining — This article is about the extraction of geological materials from the Earth. For the municipality in Austria, see Mining, Austria. For the siege tactic, see Mining (military). For name of the Chinese emperor, see Daoguang Emperor. Simplified… … Wikipedia
Betrayal at Krondor — Infobox VG| title = Betrayal at Krondor developer = Dynamix publisher = Sierra On Line designer = Neal Hallford, John Cutter released = June 22,1993 genre = Role playing game modes = Single Player ratings = USK: unrestricted platforms = MS DOS… … Wikipedia

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