normal align=center>砂金矿一般工业指标参考表
normal align=center>项目
normal align=center>露天开采
normal align=center>地下
normal align=center>开采
normal align=center>全面开采
normal align=center>分别
normal align=center>开采
normal align=center>采掘船开采
normal align=center>水枪开采
normal align=center>南方
normal align=center>北方(含高寒地区)
normal align=center>50~100L
normal align=center>150~300L
normal align=center>50~100L
normal align=center>150~300L
normal align=center>混合砂边界品位g/m3
normal align=center>0.05~0.07
normal align=center>0.04~0.06
normal align=center>0.06~0.08
normal align=center>0.05~0.07
normal align=center>0.1
normal align=center>0.3~0.5
normal align=center>
normal align=center>混合砂块段最低工业品位g/m3
normal align=center>0.16~0.18
normal align=center>0.14~0.16
normal align=center>0.18~0.20
normal align=center>0.16~0.18
normal align=center>0.3
normal align=center>0.6~1.0
normal align=center>
normal align=center>最小可采厚度m
normal align=center>30~35
normal align=center>40~60
normal align=center>30~35
normal align=center>40~60
normal align=center>20
normal align=center>
normal align=center>
normal align=center>无矿地段(夹石)剔除宽度m
normal align=center>30~35
normal align=center>40~60
normal align=center>30~35
normal align=center>40~60
normal align=center>
normal align=center>
normal align=center>
normal align=center>矿体最低可采砂矿量万m3
normal align=center>150~450
normal align=center>900~2000
normal align=center>100~300
normal align=center>600~1400
normal align=center>
normal align=center>
normal align=center>
normal align=center> 砂矿层边界品位g/m3
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>1
normal align=center> 最低工业品位g/m3
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>3
normal align=center>砂矿层采幅高度m
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>
normal align=center>1.3~1.5
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