Mercator on Monday informed the exchanges that it has restarted coal operations at its mining site in Indonesia. The operations were disturbed for a large part of the third quarter due to change in the management team, it said in the notice. The new management has now taken complete charge and expects operations to reach optimum levels by March 2018, it further added. The stock of Mercator closed at ₹45.4, a gain of about a per cent, over the previous day’s close on the NSE.