露天转地下开采矿山地下首采中段安全顶住厚度确定是矿山的关键技术问题，采用MSC。
The determination of safe pillar's thickness in the middle section of the first mining for transferring to underground mining from open pit is the key technical issue for mine. With MSC.
露天转地下开采矿山地下首采中段安全顶住厚度确定是矿山的关键技术问题，采用MSC。
The determination of safe pillar's thickness in the middle section of the first mining for transferring to underground mining from open pit is the key technical issue for mine. With MSC.
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