(Bloomberg) — Vedanta Resources Ltd. plans to sell an 11.9% stake in a US-based unit to raise about $372 million to develop its Zambian copper mining complex. Sign In or Create an Account The division, CopperTech Metals Inc., said Tuesday that it intends to put about 23.5 million shares up for sale after applying earlier this month to list in New York. The net proceeds could rise to $429 million if underwriters exercise an option to purchase additional stock.