..."Of interest, however, is that the average grade processed at primary gold mines during 2016 was 1.44g/t Au, against a mean reserve grade of 1.33g/t Au (7% lower). “The years of 3% per annum growth do now look to be behind us..."
https://im-mining.com/2017/04/06/gold-mine-production-growth-continues/
Ann: Potential to Extend All Three Boorara Deposits, page-4
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