Ann: Drilling Confirms Gold Mineralisation at Bynoe Gold Project, page-58

Australia’s gold mines by production, grades and costs... Part 1

Grades

Grade wise, for the companies that report AISC, the average reported mill head/feed grade was 3.47 g/t (Open Pit (OP) - 1.71 g/t, Underground (UG) – 5.33 g/t, Open Pit and Underground (OP/UG) - 2.35 g/t) which was down on the previous quarter, 3.91 g/t (-11.3%).

Kirkland Lake’s Fosterville mine again took out the honour as the operation with the highest average feed grade with 29.00 g/t, followed by St Barbara’s (ASX:SBM) Gwalia mine 11.50 g/t.

The lowest grade mine was Evolution’s Ernest Henry processing an average head grade of 0.56 g/t.

https://finfeed.com/investor-101/australias-gold-mines-by-production-grades-and-costs-part-1/

Stock head also has an article: When it comes to gold deposits, grade is NOT king

In the June quarter this year, Evolution Mining’s (ASX:EVN) share of the Ernest Henry operations was the lowest cost producer, reporting an AISC of $-644/oz followed by Newcrest Mining’s (ASX:NCM) Cadia Valley operations with an AISC of $174/oz.
Both these operations boast average gold grades of less than 1g/t.

And yes, you read that right — negative $644/oz. That’s because both these operations benefit from significant base metal by-products.
https://unauthorised investment advice/resources/when-it-comes-to-gold-deposits-grade-is-not-king/