(Bloomberg) -- Colombia, South America’s top coal producer, is proposing a mining bill which would ban new exploration and production contracts for the fuel. Most Read from BloombergLargest Covid Vaccine Study Yet Finds Links to Health ConditionsWall Street’s Moelis Bet Big on the Middle East. Now He’s Cashing InCapital One Weighs Acquisition of Discover FinancialStocks Pause Near Record as Traders Await Catalyst: Markets WrapTrump Keeps NY Empire Intact as Judge Rescinds Asset-Sale OrderThe pro