It was the first time that full-mechanized caving mining was used under sea in the history of coal mining under sea in the world.
海域下煤层采用综放开采在世界海域煤炭开采史上还是首次。
Xinli mining area of Sanshandao gold deposit is the first hard rock mine which belongs to the under-sea deposit in our country, and only Longkou is mining coal under sea in domestic.
三山岛金矿新立矿区是我国第一个进行海底采矿的硬岩矿山，国内仅龙口在海下采煤。
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