复杂开采条件下低品位镍矿安全高效回采方案研究

谭宝会,王永定,张志贵,龙卫国,李斌,何建元,龚臻

Study on Safety and Efficient Mining Scheme for Low Grade Nickel Ore Under Complex Mining Conditions

Baohui TAN,Yongding WANG,Zhigui ZHANG,Weiguo LONG,Bin LI,Jianyuan HE,Zhen GONG

表4 扇形中深孔崩落的矿石块度组成

Table 4 Block composition of caving ore in fan-type medium-deep hole

块度分级	尺寸/m	扇形炮孔崩落矿石块度组成比例/%			崩落矿石块度平均值/%	充填体初始冒落块度/%	充填体次级块度/%
块度分级	尺寸/m	锦宁矿业大顶山矿区	镜铁山矿桦树沟矿区	傲牛矿业毛公铁矿	崩落矿石块度平均值/%	充填体初始冒落块度/%	充填体次级块度/%
大块	>0.6	0	0	6.3	2.1	29.0	18.4
中块	0.6~0.3	12.6	0	15.3	9.3	30.0	30.1
次中块	0.3~0.1	42.3	45.1	35.6	41.0	23.0	26.0
小块	<0.1	45.1	54.9	42.8	47.6	18.0	25.5