WARSAW, Poland—A fire engulfed a conveyer belt at Poland’s largest brown coal mine Saturday before it was extinguished, and a linked power plant will have one of its units shut because the fire disrupted coal deliveries. The midday fire at the Belchatow mine in central Poland covered the area that includes Poland’s largest lignite power plant with huge clouds of black smoke. The fire was the second incident this week forcing the suspension of some of the power plant’s generators. A spokesman for Lodz region firefighters, Jedrzej Pawlak, said the conveyer belt was 30 meters (98 feet) high, making access to the flames difficult. No casualties were reported, Pawlak said. State energy group PGE, which runs the mine and the neighboring power plant, said later that the fire was out but had disrupted lignite deliveries to one of the plant’s 11 units, which will have to be shut down temporarily. …