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A Summary of Major Mineral Resources, Mines and Projects, 2nd Edition |
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Major Mining Related Events |
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Operating Mine Life: 1998 to 2012 Mining by Ernest Henry Mining Pty Ltd with commercial production commencing in |
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May 1998. Mine life is 8 years as at December 2004. Mine life may extend with underground development. |
OPEN CUT MINING
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The processing facility for this mine is one of the largest mills and |
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flloation cells in the world. Open cut was 180m deep in June |
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2000, planned to be 1,300m in diameter at 570m deep when |
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mining completed. Open cut will become a lake. |
ML
2671
ERNEST HENRY MINING PTY LTD
100.00%
ML
90041
ERNEST HENRY MINING PTY LTD
100.00%
ML
90072
ERNEST HENRY MINING PTY LTD
100.00%
ML
90075
ERNEST HENRY MINING PTY LTD
100.00%
ML
90085
ERNEST HENRY MINING PTY LTD
100.00%
ML
90100
ERNEST HENRY MINING PTY LTD
100.00%
ML
90107
ERNEST HENRY MINING PTY LTD
100.00%
ML
90116
ERNEST HENRY MINING PTY LTD
100.00%
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Host Rock/Cover Sequences |
CLONCURRY SUBPROVINCE
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Mount Fort Constantine Volcanics / PALAEOPROTEROZOIC to |
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PALAEOPROTEROZOIC |
GENERAL ORE BODY MODEL
BRECCIA HOSTED
DETAILED ORE BODY MODEL
IRON-OXIDE CU-U-AU-REE
ORE
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~1510 to 1500 Ma. Ore is mainly hosted in an |
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infill-supported hydrothermal breccia that grades to |
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veining at the margins. Ore largely composed of |
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magnetite, calcite, pyrite, biotite, K-feldspar, |
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chalcopyrite, garnet, barite, fluorite, quartz & |
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molybdenite |
MESOPROTEROZOIC
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The mineralisation at Ernest Henry is developed in a SE dipping, S to SSE plunging body of altered and variably brecciated felsic |
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volcanic rocks. The ore assemblage of the primary zone is dominated by chalcopyrite within a magnetite-carbonate gangue. |
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Copper and gold ratios are very consistent throughout the deposit. Gold occurs in the chalcopyrite crystal lattice. Supergene |
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mineralisation is complex, with copper occurring as native copper, bornite, chalcocite and secondary chalcopyrite. |