1) Hard to mine iron deposit
难采铁矿床
2) difficult mining copper deposit
难采铜矿床
1.
Research on mining method and optimization of mining preparation system in deep shaft complicated difficult mining copper deposit;
深井复杂难采铜矿床采矿方法及采准系统优化研究
3) Complicated and hard-to-mine deposits
复杂难采矿床
4) hard-to-mine ore body
难采矿体
1.
In order to study the stability of hard-to-mine ore body when using overhand drift mining method,we made analysis and comparison on four different structure parameter of Ⅲ mining area in different mining period by using the software ANSYS.
为研究新城金矿极破碎难采矿体用上向水平进路充填法回采时的稳定性,采用ANSYS有限元软件,选择Ⅲ盘区4种结构参数进行了不同开采时期的分析和比较,从而获得了最佳进路规格为5m×7m,一步盘区超前准一步盘区5个分层,即25m,也与矿山试验采场的参数相吻合。
2.
Mining of gently inclined thin and medium thick ore body with unstable roof isregarded as typical hard-to-mine ore body.
顶板不稳定的缓倾斜薄、中厚矿体为典型的难采矿体。
5) Difficult ore
难采残矿
补充资料：难夫难妻(难ｎàｎ)
一名《洞房花烛》。故事片。亚细亚影戏公司1913年摄制。郑正秋编剧，张石川、郑正秋导演。一对素不相识的青年男女，经媒婆撮合拜堂成亲，在封建礼教桎梏下开始艰难的夫妻生活。为中国第一部故事片。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条