The Mineral Resources of the Sea

amount analyses Weight percentages apparently assays Asso assuming average beach bottom bucket California Chemical coast composition concentration concerning contain continental shelf continued copper Core cost covered deposits depth designed developed diameter dredge drilling economic elements estimates expected extraction formation gold GOLDBERG hydraulic indicated iron land layer less listed locations Longitude magnesium major manganese nodules marine material metals methods miles million minerals mining ocean floor offshore ooze operation organic oxides Pacific Ocean phosphate phosphorite Photo photograph pipe plant present probably production pump range recovered red clay Reference regions relatively RENARD rock salt sampled Sampler sand sea floor sea water Sect sediments shells shown shows SiO2 sulphur surface Table taken tons Trawl United various vessel Whole nod x-sect