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  2. Deep sea mining - Wikipedia

    en.wikipedia.org/wiki/Deep_sea_mining

    For instance, mining 75,000 square kilometers of the seabed could generate $21–$42 billion in gross metal value over two decades. [138] [139] Since Deep-sea mining represents a transformative $20 trillion economic opportunity to support the global energy transition. To fully realize its potential, it is essential to address challenges ...

  3. Mountaintop removal mining - Wikipedia

    en.wikipedia.org/wiki/Mountaintop_removal_mining

    Mountaintop removal mining (MTR), also known as mountaintop mining (MTM), is a form of surface mining that involves the topographical alteration and/or removal of a summit, hill, or ridge to access buried coal seams. The MTR process involves the removal of coal seams by first fully removing the overburden lying atop them, exposing the seams ...