Sierra Metals has updated the resource for its Bolivar underground mine in Chihuahua state, Mexico based on 13,698 metres of infill drilling and 41,553 metres of exploration drilling between November 2017 and September 2019.
Bolivar’s indicated resources now stand at 11.63 million tonnes averaging 0.95% copper, 18.1 g/t silver and 0.24 g/t gold, or 1.17% copper-equivalent. Inferred resources add 16.69 million tonnes averaging 0.93% copper, 16.8 g/t silver and 0.30 g/t gold, or 1.16% copper-equivalent.
The company says it plans to update the resource again before the end of the first quarter of 2020 to incorporate 1,377 metres of infill drilling and 4,149 metres of exporation drilling completed after the Sept. 30, 2019 cut-off date.
Continue reading at The Northern Miner.