Ashcor Secunda (Pty) Ltd v Sasol Synthetic Fuels (Pty) Ltd

Sasol Synthetic Fuels (Pty) Ltd operated coal-fired boilers at Secunda, producing fly-ash as a by-product. To enable commercial exploitation of fly-ash, Sasol and Ashcor Secunda (Pty) Ltd concluded a written lease agreement relating to a Fly Ash Plant (FAP). The lease would commence 30 days after the FAP was repaired and made operational. The agreement expressly disclaimed any guarantee by Sasol as to the suitability of the premises or the quantity or quality of ash produced, and gave Ashcor a limited period to assess the economic viability of the plant, with a right to cancel. Ashcor alleged that Sasol breached the agreement by failing to repair and render the FAP operational and sued for substantial damages, alternatively seeking rectification of the contract. Sasol had spent more than R150 000 (in fact close to R1 million) on attempts to make the FAP operational, but Ashcor refused to agree to an increased rental. The High Court absolved Sasol from the instance at the close of Ashcor’s case. Ashcor appealed to the Supreme Court of Appeal.

The appeal was dismissed with costs, including the costs of two counsel.

The case is significant for reaffirming core principles of South African contract law, particularly strict textual interpretation, the continued application of the parol evidence rule, and the clear distinction between implied and tacit terms. It confirms that courts will not import tacit or implied terms that conflict with express contractual provisions and clarifies that repudiation or refusal to perform may entitle the innocent party to withhold performance without cancelling the contract.