Over time the chimneys collapse, creating the deposits of high-grade massive sulphides that so excite the deep-sea miners.

随着时间推移，烟囱坍塌，形成高品位块状硫化物矿床。这些矿床让深海矿业很感兴趣。

youdao

So why has it taken so long to move towards the commercial exploitation of deep sea massive sulphide deposits?

那么为什么深海金属硫化物矿的商业化开发要等这么长时间？

youdao

Till the late stage, the periodic sea-level changes resulted in the formation of the evaporite deposits in restricted shallow-water basin and mudstones and gravity-flow deposits in deep-water basins.

晚期因周期性的海平面变化导致形成局限浅水盆地、蒸发岩沉积和深水盆地泥岩和重力流沉积。

youdao

That said, many of the newly identified deposits are located in the central North Sea or to the west of Scotland, and will require deep-water drilling which is expensive.

FORBES: North Sea Oil and Gas may Provide One Third of Britain's Energy by 2020.