KoBold Metals, backed by billionaires Bill Gates and Jeff Bezos, says it has discovered a vast copper deposit in Zambia at its Mingomba copper project. KoBold believes Mingomba will be one of the world's largest high-grade copper mines, comparing it to the giant Kamoa-Kakula mine in size and grade. Zambia is Africa's second-largest copper producer after the Democratic Republic of Congo, and this discovery could significantly boost the country's economic prospects. KoBold aims to start copper production at the mine within 10 years to help meet the growing demand for copper in renewable energy and EVs.