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At the time, the mine's operator said ground water levels were being continually monitored as it worked on updated plans for the site's restoration.

"One of the key factors of tip management is the control of ground water and surface water, so we're trying to alleviate that problem without having created a detrimental impact on people."

It found the global average was in fact 1,931 litres of ground water and fresh water resources, with the environmental impact varying greatly depending on the country where the cotton is grown.

The report identified "a medium level risk from a quarry spoil tip near the school, which is affected by ground water".

They are produced in a number of ways but the main process involves the interaction of ground water with iron-rich minerals such as olivine.