Saleable production from the quarter remained strong notwithstanding unseasonal wet weather.
Strong truck and shovel productivities were partly offset by wet weather.
Stanmore is in the process of extending the life of the Isaac Plains East operations.
Costs were also impacted due to working near faulted zones in the mining pit.
The underlying free-on-board costs for the June quarter were $78/t sold.
Stanmore's two stage cost structures allow scalability up and down.
Mining operations at the original Isaac Plains mine ceased during the quarter.
Stanmore is expecting to boost saleable coal production to 2.15Mt in FY19.
Stanmore is now increasing its FY19 production guidance.
Coal production for the June quarter was on the lower end of guidance.
The company still managed to report an 8% increase in run-of-mine production to 382,000t.