Detail section of gallery for asses for pit in AutoCAD, dwg file.

<p>This Architectural Drawing is AutoCAD 2d drawing of Detail section of gallery for asses for pit in AutoCAD, dwg file. open-pit mining Mining. a method of mining in which the surface excavation is open for the duration of mining activity, employed to remove ores and minerals near the surface by first removing the waste or overburden and then breaking and loading the ore.</p>