Transalloys (Pty) Ltd v Mineral-Loy (Pty) Ltd

Mineral-Loy instituted action against Highveld Steel and Vanadium Corporation Ltd and Transalloys for unpaid commission and damages arising from an alleged distribution and service agreement originally concluded in 1985 and amended in 1994. Certain issues relating to the existence, terms, assignment and repudiation of the agreement were separated and finally determined in Mineral-Loy’s favour by Bertelsmann J in 2013. After that judgment, Mineral-Loy amended its particulars of claim to increase damages and to add new claims based on further alleged breaches discovered during the first hearing. Transalloys then amended its plea, alleging that the agreement had been varied in December 2006 or that Mineral-Loy had waived its rights, thereby disentitling it to commission. Mineral-Loy replicated that these new defences were barred by res judicata (issue estoppel). The High Court upheld the replication. Transalloys appealed to the Supreme Court of Appeal.

The appeal succeeded only to a limited extent. The High Court order was set aside and replaced with an order upholding the replication of res judicata and striking out paragraphs 9.2 to 9.4, 17.2 and 22.2.1 of the amended plea. Transalloys was ordered to pay the costs of the separate determination. The appeal was otherwise dismissed with costs, including costs of two counsel.

The case clarifies the application of res judicata and issue estoppel in South African civil procedure, particularly where issues have been finally determined on a separated basis. It reinforces the once-and-for-all rule and underscores that parties must raise all available defences when issues are first adjudicated. The judgment also provides authoritative guidance and caution on the inappropriate use of issue separation under Rule 33(4).