   ( 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: large, medium-sized ore generally 8m, small mineral 4M; clayey material, a siliceous material: rock-like ore ships 4m, like soft ore ships 1 5m.
(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) Final chassis stope minimum width: rocky ore: medium-sized generally not less than 60m, small ore generally not less than 40m; soft like mine: a medium-sized generally not less than 40m, a small-sized ore 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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