In course of sinking the well-shaft they came upon a deposit of a very rare mineral.
他们在凿井的过程中，发现了一处稀有矿物矿床。
2
It provides access to a large-cross section of a well, instead of just a narrow, vertical shaft.
提供了一个大的油井截面，而不只是一个狭长竖井。
3
Not only is the escape shaft ready, but the special capsule that was sent down to rescue the men has been tested to a depth of 610 metres, and the Mining Minister Laurence Golborne says all went well.