Ann: Quarterly Cashflow Report - December 2018, page-29

The other calculation worth noting is based on the estimates production guidance and March quarterly production outflow:
- Production guidance (65,000wmt - 80,000wmt) for first 6 months (Jan-Jun) 
    - Therefore, let's assume 32,500wmt - 40,000wmt for 3 months (Jan-Mar = 90 days)
    - First 29 days produced 13,266wmt (pro rata = 41,170wmt)
 - Production outflow of $35m
- Estimated production cost per tonne (compared to US$824/t or A$1152/t in Dec qtr)
    - Lower guidance = 32,500wmt = US$786/t or A$1076/t
    - Upper guidance = 40,000wmt = US$638/t or A$875/t
    - Pro rata = 41,170wmt = US$620/t or A$850/t