The Globe and Mail reports in its Saturday edition that unions representing workers at the Loulo-Gounkoto gold complex in Mali, operated by Barrick, have issued a series of strike notices to management, raising the risk of labour disruptions from Sept. 28 at one of Mali's largest gold-producing operations. A Reuters dispatch to The Globe says notices were filed by unions representing mine workers at Somilo SA and Gounkoto SA, which operate the mines at the complex. Separate strike notices were submitted by Barrick's catering and support staff contractor Food & Events Africa (FEA) and workers in Mali's mining regulator and other mining administration agencies. The unions said they would begin strike action toward the end of the month if demands related to overtime pay, reimbursement of mission expenses and implementation of labour agreements were not met. Mali, one of Africa's largest gold producers, has been tightening its grip on the mining sector as it seeks a bigger share of revenues. The military-led government returned operational control of the Loulo-Gounkoto complex to Barrick in December after the government placed the complex under temporary state administration during a dispute that lasted almost a year.