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The Subika underground project, completed on schedule and within budget, achieved commercial production in November 2018, adding higher-grade, lower cost gold production at the Ahafo mine.

The mine is expected to increase average annual gold production by between 150,000 and 200,000 ounces per year for the first five years beginning in 2019 with an initial mine life of approximately 11 years. Capital costs for the project are estimated at between $160 and $200 million with expenditure of $80 to $90 million in 2017. The project has an IRR of more than 20 percent at a $1,200 gold price.