Business NGT bans mining of quartz, feldspar in Telangana's Nagarkurnool district Updated : January 17, 2020 04:13 PM IST The mine lease holder had argued before the NGT that a buffer of 250 metre has been left from the lake boundary to the lease boundary to protect the lake. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.