BEIJING, Nov 15 (Reuters) - China’s October coal output rose to the highest since at least March 2015, after Beijing approved a raft of coal mine expansions to tame record prices and boost supply. The world’s biggest producer and consumer of the dirty fossil fuel churned out 357.09 million tonnes of coal last month, up from 334.1 million tonnes in September, data from the National Bureau of Statistics showed on Monday. Output over the first 10 months of 2021 was 3.3 billion tonnes, up 4% year-on-year. Reporting by Muyu Xu and Shivani Singh