Narayanan Nair

hindustan copper limited mines complex mining copper project hindustan mechanized metalliferous zinc gold malanjkhand limited khetri limited bharat limited metalliferous india underground india open cast copper mining mines safety india regulation safety dgms mines india mining technology india limited bharat gold mines limited hindustan zinc limited regulatory mines rules bharat gold mines limited indian mining legislation director general of mines safety india underground mines safety agency regulations opencast dgms lead ground indian technology under open india pint school methods jhunjhunu khetrinagar malanjkhad