Ann: GRR - Quarterly Report for 3 months ended 30 September 2017, page-24

Good numbers but two adjustment required.
1. GRR's C1 includes pre-strip costs. In FY2016 these averaged A$11.5m pq. In HY2017 these averaged A$11m pq. So I assume A$11m in pre-strip costs in FY2017 Q3 and Q4.
2. GRR also capitalizes a portion of C1 into PP&E. Over the last 10 QTRS this has averaged A$8m pq. So I assume a deduction of A$8m pq from C1
3. Therefore the total cost I deduct from C1 each quarter & capitalize is A$19m.
So if you adjust your numbers for the above, you almost get mine.