Historical rainfall data was sourced from the Moonmera BoM rainfall station (No. 039067), which dataset spans January 1901 to March 2026. Historical pan evaporation (Class A Pan) data was obtained from the SILO Data Drill 1 [5] for the Moonmera station (grid point at latitude -23.5798 and longitude 150.4044) covering the period from January 2010 to April 2026.
Long term rainfall data at Moonmera indicates the following key aspects:
— The majority of annual precipitation occurs during a relatively short summer wet season, with mean total annual rainfall of approximately 800 mm. — Average monthly rainfall is highest in January and February, when mean totals exceed approximately 130 mm, and remains comparatively elevated in December. — Rainfall decreases during autumn and winter, with July to September consistently the driest months, when average monthly precipitation is generally below 35 mm. — Evaporation rates are higher during the warmer months (approximately October to April) and lower during the winter period, with minimum rates typically occurring in June and July.
The Moonmera weather station rainfall data and the SILO evaporation data are presented in Figure 4.2.
Figure 4.2
Average monthly for Moonmera weather station rainfall data and SILO evaporation
The following sections describe the hydrogeological setting of the Mount Morgan area, and the hydrogeological conceptualisation developed for UMG TSF.
1 SILO is a Queensland Government database that supplies long‑term daily climate data for Australia, derived from Bureau of Meteorology records and gap‑filled to provide continuous datasets.
Project No PS213278 Mount Morgan Mine - Upper Mundic Gully TSF Seepage Management Plan Heritage Minerals
WSP May 2026 Page 10
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