Exact(1)
Twelve bench coal samples were collected from the mined face of the No. 6 coal seam at the Wulantuga Mine in the Shengli coalfield in Inner Mongolia, including six coal ply and one roof samples from the Ge-poor coal seam; two fusains, one fly ash, one slag and one pyrite samples from the Wulantuga Ge-rich ore deposit.
Similar(59)
A total of 6 coal ply samples were collected from the mining face of the mined No. 6 coal, which have an average thickness of 16.1 m at the Wulantuga Ge-poor deposit of the Shengli Coalfield in Inner Mongolia, North China.
By collaborative mining of the first-mined seam and the adjacent protected seams, the layout of 'one mining face, one drainage face, and one preparation face' can be achieved.
A tunnel was constructed in the adjacent coal seam under the first-mined working face and the bedding borehole was then constructed on both sides to cover the projection area of this face.
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A total of 20 bench samples were taken from the working face of the mined coal in the Moxinpo mine, following the Chinese Standard GB/T482-2008, including 18 coal benches, one parting and one floor samples.
The mined coal seam of 12,407 working face in mining area is Coal 1−2, of which the depth is 190 220 m, the average thickness is 4.81 m and the dip angle is 1 3°, and the coal seam is stable as well as the structure is simple.
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The drainage boreholes of adjacent seams should be constructed and interconnected for drainage, and should also be 200 m ahead of the working face of the first-mined seam.
To realize complete and sufficient pressure relief of protected adjacent coal seams, the working face of the first-mined seam should advance the protected seam working face by one to two sections in the tilt direction and must ensure sufficient advance time.
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