HWANGE COLLIERY CO. LTD versus HWANGE COAL GASIFICATION CO. (PVT) LTD & 8 Ors (HC5171/13) [Case 1] HWANGE COLLIERY CO. LTD and HWANGE COAL GASIFICATION CO. [PVT] LTD & 6 Ors (HC5105/13) [Case 2] HWANGE COLLIERY CO. LTD and TENDAI SAVANHU& Anor (HC533