Coal India trade unions have begun a three-day strike beginning Thursday as they protest against the government’s decision to allow commercial coal mining in the country. The three-day long halt in operations is likely to hit around four million tonnes of production, PTI reported. The strike has been effective since the first shift which begins at 6 AM, Nathulal Pandey, president of HMS-affiliated Hind Khadan Mazdoor Federation said. The coal mining company produces 1.3 million tonnes (MT) of coal every day, and since the strike will go on for three days, it is estimated that the production loss will be to the tune of 4 million tonnes, Nathulal Pandey said.