Modeling of Area-End Ore Drawing under Caved Rocks

Discrete Element Modeling of Discharge Flow of Granular Media From Underground Chamber With Account of the Non-Spherical Particle Form

“…Кроме этих видов присутствуют потери в целиках днища из-за наклонных контактов между телом и подстилающими породами. Источниками разубоживания являются обрушенные пустые породы, смешивающиеся с полезным ископаемым при выпуске [4,5].…”

Geomechanical assessment of ore drawpoint stability in mining with caving

“…The sublevel caving model assumed the following parameters: ore body thickness-50 m; dip angle 70°; simultaneously mined sublevels-2; sublevel height-20 m; spacing of drilling-andhaulage crosscuts-14 m; spacing of loading ramps-14 m. the design of this mining system with the cited parameters was accepted based on the maximum completeness and higher quality of ore extraction, determined in [2,[4][5][6][7]. In the combined ore drawing scheme II, the worst conditions capture the juncture of the loading ram and the drilling-and-haulage crosscut, immediately adjacent the stoping face (and the ore drawpoint).…”

“…With known advantages [1][2][3], the drawbacks of the method are relatively low quality and completeness of extraction, complicated airing of dead-end faces. In this connection, the method of combined ore drawing abut the faces of haulage drifts and lengthwise loading ramps was developed, that allows mine airing at expense of mine depression [4][5][6][7].…”

“…Based on research results [2,4,7], combined scheme of ore drawing abut the stope face and lengthwise the stope reduces ore loss 1.4-1.5 times and dilution-by 30-35%. Doing this way, it is required to drive additional mine workings-loading ramps, which damages ore haulage levels.…”