Devastating toxic spill seen as test of whether African countries can stand up to China

Chinese companies provide jobs and much needed revenue in Zambia, where the disaster took place.

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"If our work protective gear gets damaged, it is not always replaced," he tells us. "We have to take a risk and use it again."

He is talking to the BBC in a car on a quiet backroad near a village in northern Zambia, too nervous to speak to us in public or to use his real name, for fear that speaking to the press might cost him his livelihood.

When he turned up for his shift one day in February, he tells us, he found that one of the dams at the Chinese-owned mine had been closed.

The tailings dam - used to store toxic by-products from the copper mining process, including heavy metals like arsenic, mercury and lead - had collapsed into a tributary connected to the Kafue, Zambia's longest river and a major drinking water source.