Ramaswami: Miners at Telangana’s Singareni coal fields have launched a protest demanding adequate safety measures from the management of the Singareni Collieries Company Limited, in the light of the spread of the coronavirus. Nearly 50,000 workers are engaged in open cast and underground coal mining operations. The Singareni coal reserves stretch across 350 km of the Pranahitha-Godavari Valley of Telangana with proven geological reserves aggregating to 8,791 million tonnes, says the SCCL official website.