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An employee holds a stack of gold bars in the precious metals vault at Pro Aurum KG in Munich, Germany, on Wednesday, July 22, 2020. Silver jumped to the highest in almost seven years and gold continued its march toward a record on expectations there’ll be more stimulus to help the global economy recover from the coronavirus pandemic. Photographer: Andreas Gebert/Bloomberg

Tech and pharma may be getting the attention these days, but three mining billionaires are quietly padding their fortunes with an investment that’s decidedly more old school.

Saudi Arabia’s Mohammed Al Amoudi and Russia’s Alexander Nesis and Suleiman Kerimov have the largest exposure to gold among the world’s wealthiest people, according to the Bloomberg Billionaires Index. As a result, they’ve collectively become $2.8 billion richer this year.

With the coronavirus pandemic devastating economies and central banks and governments boosting stimulus measures, gold is once again king. Investors flocking to the precious metal pushed its price to a record high this week. Goldman Sachs Group Inc., Citigroup Inc. and Bank of America Corp., among others, say the rally could go even further as interest rates fall with the U.S. dollar.

Kerimov, whose family controls about 77% of Polyus PJSC, Russia’s biggest gold miner, is now worth $6.6 billion, according to the Bloomberg index. He’s added $1.6 billion this year as his company’s shares have almost doubled in price. The fortune of Nesis, whose ICT Group has a 27% stake in Polymetal International Plc, has risen to $3.7 billion, while that of Midroc Gold Mine Plc’s Al Amoudi stands at $9.2 billion. Egyptian billionaire Naguib Sawiris said in March he was increasing his exposure to gold.

While gold bugs are gaining, 2020 has largely been the year of technology and pharmaceuticals as Covid-19 has kept people home and scientists race to find a cure. Inc.’s Jeff Bezos, Tencent Holdings Ltd.’s Pony Ma, and Jiang Rensheng, chairman of vaccine maker Chongqing Zhifei Biological Products Co., are among the billionaires whose fortunes have surged the most. They’ve gained more than $14 billion each this year, according to the Bloomberg index.