overhand stoping method

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Mining in the Upper Harz — The headframe of the Emperor William Shaft in Clausthal is one of the oldest surviving winding towers in Germany … Wikipedia
square set system — noun : a method of timbering a mine in which heavy timbers are framed together in rectangular sets 6 or 7 feet high and from 4 to 6 feet long so as to fill in as the ore body is removed by overhand stoping … Useful english dictionary
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

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