结合三山岛金矿的具体情况，因地制宜地研究应用了以回风侧为主的多级机站通风系统模式。
In line with the local conditions of Sanshandao Gold Mine, a mode of multi-staged ventilation system mainly on the wind return side was investigated and used.
答：先把原矿石进行多级精选，然后再进行制砂，分级，磁选，最后再进行精提纯。
Answer: the first raw ore to multistage selected, and then made sand, grade, magnetic separation, finally carried out again pure purification.
答：先把原矿石进行多级精选，然后再进行制砂，分级，磁选，最后再进行精提纯。
Answer: the first raw ore to multistage selected, and then made sand, grade, magnetic separation, finally carried out again pure purification.
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