Advance Africa (Pvt) Ltd v Birmet Investments (Pvt) Ltd

Advance Africa (plaintiff), a gold mining company, contracted Birmet Investments (defendant), a manufacturing concern, to supply components for a gold processing plant's agitation unit. The parties entered into an oral contract whereby defendant would fabricate mixers (shaft, impellers and couplings). There were also arrangements regarding procurement of gearboxes and motors from a South African company called Mixtec. After installation, the agitation plant failed to operate. Plaintiff made an initial deposit of US$14,000 for ongoing supply arrangements. The plant briefly operated after modifications (reduced impeller size, tubular shafts replacing solid steel) but broke down again after two weeks. Defendant at one point replaced motors with higher-powered 9kw motors at its own expense attempting to remedy the situation. Plaintiff claimed three separate amounts: (1) US$7,600 for defective mixers; (2) R142,000 for faulty gearboxes/motors; and (3) US$200,000 for consequential damages/lost earnings.

• Whether the oral contract included an obligation on defendant to install the mixers or merely to supply them
• Whether defendant exhibited poor workmanship in fabricating the mixers constituting breach of contract
• Whether defendant was responsible for procuring the gearboxes and motors from Mixtec
• Whether the gearboxes and motors were defective or unsuitable
• Whether there was a causal nexus between any breach by defendant and the plant's malfunction
• Whether plaintiff proved damages and quantum thereof
• Whether plaintiff discharged the onus of proof on a balance of probabilities

All three claims dismissed with costs awarded to defendant: (1) Claim for US$7,600 for mixers dismissed; (2) Claim for R142,000 for gearboxes/motors dismissed; (3) Claim for US$200,000 consequential damages dismissed; (4) Plaintiff ordered to pay defendant's costs.

In contract claims based on oral agreements with mutually destructive versions, the party bearing the onus must lead corroborative evidence where available to discharge the burden of proof on a balance of probabilities. Where a party with knowledge of defective contractual performance allows the defaulting party to rectify the breach, this constitutes an implied election to affirm the contract, precluding subsequent claims for damages for that breach. To establish a claim for consequential damages arising from breach of contract, the claimant must prove: (1) breach; (2) damage; (3) factual causal nexus using the conditio sine qua non test; (4) that damage is a natural consequence of breach; and (5) quantum. In specialized technical matters, expert evidence is necessary to establish the causal nexus between alleged breach and damage; failure to lead such evidence where causation is in dispute will be fatal to a damages claim. Mere ipse dixit of an interested party, even if possessing some technical knowledge, is insufficient to discharge the onus of proving causation in complex mechanical/engineering failures.

The court observed that the relationship between the parties exhibited elements of friendship and mutual respect transcending immediate financial considerations, as evidenced by the substantial deposit paid before work commenced and defendant's willingness to supply replacement motors to get the plant operational. The court noted that the term 'specification' in engineering contexts connotes precision and exactitude, not mere guidelines - a contractor must adhere to technical specifications unless variation is agreed. The court commented that it would be expected that equipment of this nature and size would include safety relay switches that trip in case of power overload, making it improbable that excessive power draw would damage motors/gearboxes without triggering such protection. The court also observed that guarantees provided by Mixtec covering defects for 12 months from commissioning or 18 months from delivery would have provided remedy if the gearboxes/motors were truly defective, and failure to pursue this remedy undermined plaintiff's case.

This case is significant in Zimbabwean contract law for illustrating: (1) the strict application of onus of proof principles in civil claims based on oral contracts where versions are mutually destructive; (2) the critical importance of corroborative evidence where a party bears the onus, particularly in commercial disputes; (3) the doctrine of election/affirmation in contract law - where a party with knowledge of defective performance allows rectification, they impliedly elect to uphold rather than cancel the contract; (4) the requirement for expert evidence to establish causation in technical/scientific matters, particularly regarding the conditio sine qua non test for factual causation in damages claims; (5) application of the Stellenbosch Farmers' Winery approach to evaluating competing versions based on credibility, reliability and probabilities; and (6) the proper use of s20 Civil Evidence Act for expert opinion evidence in specialized fields.