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  2. Deep sea mining - Wikipedia

    en.wikipedia.org/wiki/Deep_sea_mining

    The lease licensed access to 59 square kilometers. Nautilus was allowed to mine to a depth of 1,600 meters for a period of 20 years. [47] [46] The company then began the process of gathering the materials and raising money for the project. [48] The intent was to mine a high grade copper-gold resource from a weakly active hydrothermal vent. [49]

  3. δ18O - Wikipedia

    en.wikipedia.org/wiki/Δ18O

    In geochemistry, paleoclimatology and paleoceanography δ 18 O or delta-O-18 is a measure of the deviation in ratio of stable isotopes oxygen-18 (18 O) and oxygen-16 (16 O). It is commonly used as a measure of the temperature of precipitation, as a measure of groundwater/mineral interactions, and as an indicator of processes that show isotopic fractionation, like methanogenesis.

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