In 1879-80 , there were fifty-six mines working in Raniganj , but no new mines were opened in the other areas , in addition to the ones mentioned above . सन् 1879-80 में रानीगंज में 56 खानें थीं लेकिन उपरोक़्त खानों के अतिरिक़्त अन्य कोई नयी खन नहीं खोदी गयी .
मोबाइल