( 2 ) Stripping ratio: the ratio of the total stripping of the overburden, vein rock, interlayer, and surrounding rock to the total amount of ore, generally not more than 0.5 : 1 ( M 3 / M 3 ) .
(3) Mining Thickness: limestone, dolomite: large, medium-sized ore generally 8m, small mineral 4m.
(4) The thickness of the stone is removed: the rocky ore is generally 2m, and the soft ore is generally 1m.
(5) Final slope angle of the stope: the rocky ore is generally 50 ° ~ 60 ° , and the soft ore is generally 45 ° .
(6) Minimum width of the final chassis of the stope:
Rocky ore: large and medium-sized is generally not less than 60m, and small ore is generally not less than 40m ;
Soft like mine: a medium-sized generally not less than 40m, small-scale mining is generally not less than 20m.
(7) blasting safety distance: The mining boundary deposits of blasting safety distance highways, railways, power lines, residential and other major buildings generally not less than 3 00 m, such as blasting safety distance of less than 3 00 m, and investors should Agreed.
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