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”Major difficulty is in removing the ore from the seafloor to the deck” -where it appears?

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”Major difficulty is in removing the ore from the seafloor to the deck” -where it appears?

(a) Seafloor mining

(b) Recovery from offshore placer deposits

(c) Offshore mining and processing

(d) Deep sea sediments

I had been asked this question during an online interview.

My question is from Chemical From Sea in section Inorganic Chemical Industries of Chemical Technology

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Correct option is (c) Offshore mining and processing

Easiest explanation: The major difficulty is in this process is in removing the ore from the seafloor to the deck of the process barge. The considerable interests are seafloor phosphorite deposits on the shelves off the coasts of many nations.

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