The article tries hard to give the impression that the fungus is transmuting other elements into gold. The real story is that the fungus is chemically reacting with and concentrating trace amounts of gold in the environment. Read the paper that others have linked to if you're interested, but don't waste your time on the article.
Yes, I dropped out of chemistry early on, but even I smelt a rat. Stupid clickbait.
Scientists have discovered that the common fungus Fusarium oxysporum can 'convert certain metals into gold'. In a study led by CSIRO researcher Tsing Bohu, the fungus was mixed with meteorite dust and surprisingly transformed its minerals into tiny gold particles.