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贝纳当(Bernardan)地下矿位于法国上维埃纳省,靠近贝奈兹(Benaize)的迈尔阿克(Mailhac)矿山租借地内。该矿采用下向分层混凝土充填采矿法,开采几个近似垂直的浅成正长岩柱状铀矿脉。矿脉断面200~800m~2,上下水平高差350m。
The underground mine Bernardan is located in Upper Vienne, France near the Mailhac mine rental in Benaize. The mine uses downward stratified concrete filling mining method, the exploitation of several approximately vertical shallow into a positive columnar uranium vein. The section of the veins is 200 ~ 800m ~ 2, and the height difference between the upper and lower levels is 350m.