nodule

The discovery was made after the Democrat politician reported urinary symptoms which led doctors to find a small nodule on his prostate.

Many of the minerals involved in proposed deep sea mining operations are located on black, potato-shaped nodules that lie on the seafloor.

Biden said his diagnosis was made on Friday after he reported urinary symptoms which led doctors to find a small nodule on his prostate.

The 82-year-old Biden went in for an evaluation earlier this week, which led doctors to find a "small nodule" on his prostate.

The deep sea contains billions of tonnes of potato-shaped rocks, called polymetallic nodules, which are rich in critical minerals like cobalt and rare earths.