Calgary-based Chad player Griffiths Energy International has abandoned plans for a share listing. A letter dated 3 February from its lawyers Norton Rose asked Canada’s securities regulators to withdraw its preliminary prospectus, which was filed in November. Griffiths Energy signed three production-sharing contracts (PSCs) with the N’djamena government last year: the 2,744km2 Mangara/Badila PSC, which comprises the DOB and DOI blocks, the 22,206km2 Doseo/Borogop PSC, made up of the Doseo and Borogop blocks, and the 826km2 DOH PSC