Teikoku has advised Jadestone it is invalidating the latterâs 30% farmin to blocks 05-1b and 05-1c, 927 sq km offshore Nam Con Son shelf, agreed upon in Aug â16. This occurred after PetroVietnam waived its pre-emption rights in the blocks. Jadestonem who apparently does not accept the move, is assessing options, as the SPA included USD 14.3 MM cash and contingent liabilities. The acreage contains the Sao Vang, Dai Nguyet + Thanh Long gas/cond discoveries. Partnership until then Idemitsu (op), partners JX NOEX + Teikoku. Background from GEPS.  
Teikoku has advised Jadestone it is invalidating the latterâs 30% farmin to blocks 05-1b and 05-1c.This occurred after PetroVietnam waived its pre-emption rights in the blocks. Jadestone reported that it was assessing options as it was not accepting the termination.