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。
2
So why has it taken so long to move towards the commercial exploitation of deepsea 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？
3
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.