Poly­metal­lic man­ganese nod­ules:

Down to Earth - - COVER STORY -

They are in the sizes rang­ing from a potato to a din­ing ta­ble and are avail­able in plenty on sea floors at the depth of 4,000 me­tres to 6,500 me­tres. They have been known since the 1860s and were first men­tioned in HMS Chal­lenger ex­pe­di­tion. They con­tain nickel, cop­per, lithium be­sides other min­er­als. The Clar­ion Clipperton Zone of the Pa­cific has sig­nif­i­cant de­posits: 15 kg per sq m. This en­tire zone con­tains 62 bil­lion tonnes of such nod­ules.

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