Jul 04, 2016· Mining: The 15year lease for the Khothakpa gypsum mine in Pemagatshel will expire on December 31 2018. Druk Satair Corporation Ltd (DSCL) has been extracting gypsum from the Khothakpa gypsum mine for the last 22 years since 1994. Although, it is not yet determined, with the ongoing debate in ...