At 0710 GMT, the rand traded at 18.90 against the U.S. dollar, compared with its previous close of 18.91.

Statistics South Africa will publish December mining output around 0930 GMT, after upbeat November data showed a 6.8% expansion in overall output.

"December will provide evidence of whether some resilience is emerging in the industry. South Africa's myriad crises, such as load-shedding (power cuts), rail logistics and port backlogs, weigh on productivity and throughput," ETM Analytics said in a research note.

On the Johannesburg Stock Exchange, the Top-40 index was up 0.1% in early trade. The benchmark 2030 government bond was marginally firmer, the yield falling 2 basis points to 10.025%.

(Reporting by Alexander Winning; Editing by Andrew Heavens)