露天转地下开采矿山通常是矿体延伸较深、覆盖层不厚,多为中厚或厚大的急倾斜矿床,由于这类矿床采用露天开采后,具有投产快、初期建设投资少、贫损指标优等优点,早期一般采用露天开采方式进行采矿,但当露天开采不断延深后,这些矿山逐步由露天开采向地下开采过渡,最终全面转向地下开采。因此,要求露天转地下开采的矿山,在进行露天转地下开 Open cast underground mining is usually the ore body extends deeper, the cover is not thick, mostly thick or thick steep deposits, because of the use of opencast mining of such deposits, with production quickly, less initial investment, loss However, when the open-pit mining continues to deepen, the mines gradually transition from open-pit mining to underground mining, and eventually turn to underground mining. Therefore, the requirements of underground mining turn underground mines, underground open in the open