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Said Tom Elliott, professor at the University Hospital Birmingham (UHB), the study leader: "The results of the first clinical trials in both Birmingham and South Africa suggest that the use of copper may assist in maintaining hospital surfaces free of bacteria and could augment cleaning programmes. "The findings related to the use of a copper biocide adds further evidence to the potential of this metal for fighting infection," he added.

The new Act does not allow scrap metal dealers to have in their possession any apparatus which could be used for the recycling of any controlled metal or any article or substance containing any controlled metal, Bezuidenhout said at the Copper Cable Theft conference, in Johannesburg.

EY, the consultancy, said affordable water and energy should now be viewed as one of the 10 biggest problems for miners. The threat was particularly acute in South America and Africa, it said. These continents are significant in the global supply of many metals, particularly copper.