The Globe and Mail reports in its Wednesday edition that Barrick has found uranium in the drinking water of an open section of its Lumwana copper mine in Zambia, forcing it to halt the water supply and switch to other water sources for its workers in the section. The Globe's Geoffrey York writes that the Zambian mine has become increasingly important to Barrick's future. The company has announced plans for a $2-billion (U.S.) expansion at Lumwana to create one of the world's biggest copper mines, with construction to begin late this year and production from the project expected by 2028. Tests of drinking water in the mine's Chimiwungo open section on Nov. 8 found a uranium level of 0.037 milligram per litre, exceeding Zambia's maximum allowable limit of 0.03 milligram, according to a statement by Barrick's country manager in Zambia, Anthony Malenga. Canada's health guidelines set a maximum of 0.02 milligram, so the level at Lumwana was nearly twice the Canadian limit. Soon after the water problem was discovered, an internal e-mail went out on Nov. 8. A Barrick official said the drinking water was "high in uranium" and "contaminated with uranium." The official, Oreen Kinyanta, told colleagues, "Please don't use it."