The paper introduced the blasting design for recovery of the crownpillar in detail.
文中较详细地介绍了该顶柱回采的爆破设计。
2
The crownpillar of stope is permanent loss and not recoverable, while sill pillar and barrier pillar shall be recovered after the ore drawing work is completed.
采场的顶柱作为永久矿柱损失，采场底柱、间柱等采场大量放矿完毕后，一次性进行回收。
3
Based on the existing conditions, Pindu Municipal Gold Mine preferred short-hole shrinkage stoping without sill, intermediate and crownpillar to other mining methods and obtained excellent result.