A reclusive Chinese billionaire whose prescient gold trades turned into an eye-catching windfall has now become the country’s biggest copper bull, amassing a bet worth nearly $1 billion in a market jolted by escalating competition between the US and China.

Bian Ximing, who made an early fortune in plastic tubes before seeking a quiet life in Gibraltar, has made waves over the last two years with his investment in Chinese gold futures, betting on what he argued would be a global effort to reduce reliance on the dollar and counter inflation worries. His fund came in just as bullion was beginning a record-breaking ascent — and made roughly $1.5 billion in profit in the process, according to Bloomberg calculations.