Coal India Ltd. increased prices of the commodity for long-term buyers as the world’s largest miner seeks to offset higher staff salaries. The Kolkata-based company will raise base prices of the top nine grades of thermal coal by 8% starting May 31, according to a stock exchange filing Tuesday. The hike will boost revenue for the ongoing fiscal year through March by 27 billion rupees ($326 million), the company estimated, without giving further details. The new prices will be for all categories of customers. The price increase, the first in more than five years, is unlikely to impact India’s hunger for the dirtiest ... (full story)