WARSAW, Poland—Miners employed by Poland’s largest coal company blocked deliveries of the fossil fuel to state-run power plants Tuesday to demand higher pay to keep pace with surging consumer prices. Groups of protesters were stopping trains leaving the Halemba mine and other mines of the Polish Coalmining Group in the southern Silesia region. They demanded higher pay for weekend shifts and clear declarations that wages this year will rise to offset inflation that reached 7.7 percent in November. They also were protesting imports of cheaper coal from Russia. Up to 40 trainloads of coal are dispatched from the company’s mines each day. The action is planned for two days and could affect power generation at large state-run plants, which provide most of Poland’s energy. However, individual buyers can still purchase coal for heating their homes. The mining company says it is ready for talks through a mediator, who is still …