Commercial production at Gruyere

Commercial production has been declared at the Gruyere gold mine in Western Australia by joint venture partners Gold Fields and Gold Road Resources
Commercial production at Gruyere Commercial production at Gruyere Commercial production at Gruyere Commercial production at Gruyere Commercial production at Gruyere

Gold Fields executive vice president Australasia Stuart Mathews (left) with Gold Road managing director Duncan Gibbs at Gruyere in August

Commercial production was reached at the end of September, slightly ahead of target and midway through the previously stated six to seven-month ramp-up period.

Gruyere is expected to produce 300,000oz/y at average all-in sustaining costs of A$1,025 (US$697) an ounce over 12 years.

Management declared commercial production based on a pre-determined minimum total process plant throughput rate of 70% of nameplate capacity, and a minimum average gold recovery of 85% of expected life of mine metallurgical recovery, measured over a month, with the expectation that these metrics will continue to be met or exceeded in the future.

As throughput rates and gold recoveries during ramp-up have been above expectations, the JV now anticipates gold production for 2019 to be at the upper end of guidance of 75,000-100,000oz of gold.