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The reserve upgrade has been adjusted to reflect the 5.4Mt of coal mined since the previous reserves upgrade.
Gloucester has two operations in the Gloucester Basin, comprising the Duralie open cut operation and the Stratford mine.
Proved and probable reserves for the Duralie main and northwest pit now stand at 14Mt, comprising 9.2Mt of proved reserves and 4.8Mt of probable reserves.
In the Avon north pit of Stratford, proved and probable reserves stand at 2.5Mt, while Stratford East reserves stand at 2.9Mt.
The coal reserves upgrade was compiled by Runge’s Robert Mackenzie and Ellemby Consulting’s Sam Reich.
Gloucester is currently the target of a proposed takeover from Chinese-owned Yancoal.
The $8 billion deal has been approved by federal Treasurer Wayne Swan.
The merger remains subject to Foreign Investment Review Board approval, Yanzhou shareholder approval and various other Australian and Chinese regulatory approvals.
