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Location: 716 km SE from Darwin, Northern Territory, Australia
PO Box 36821WinnellieNorthern Territory, Australia0821
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McArthur River Mine (formerly known as HYC) Zinc-lead-silver mineralisation occurs predominantly as ultrafine bedded parallel sphalerite and galena rich bands hosted by dolomitic and carbonaceous pyritic siltstones, graded beds and chaotic debris flow breccias. The HYC mineralisation covers an area of about two km2 and has an average thickness of about 55 m. It is 1.5 km west of the Emu Fault and separated from the fault by the Cooley Dolomite Member of the Barney Creek Formation and the Western Fault Block. The western margin of the deposit has been folded and eroded and the eastern margin is faulted against the Cooley Dolomite Member. The northern margin interfingers with sedimentary slump breccia derived from older McArthur River Group sediments to the north of the deposit. The southern margin, which has been down faulted by 100 to 200 m by the northeast trending Woyzbun Fault, is transitional into barren pyritic shale. The deposit is divided into seven mineralised intervals referred to as orebodies. Orebodies comprise shale with lesser amounts of sedimentary breccia and tuff. Number 1 orebody is used to refer to an interval of weak silver-lead-zinc mineralisation hosted by nodular dolomitic shale in the footwall sequence. In addition, there is a broad interval of weak silver-lead-zinc mineralisation hosted by nodular dolomitic shale in the immediate hanging wall, along the eastern margin of the deposit. The hanging wall sequence comprises interbedded dolomitic shale, sedimentary turbidite breccia and occasional tuff beds. The Cooley Dolomite occurs along the eastern margin of the deposit. It comprises a fault bounded block of Teena and Mara Dolomite Members (older than the host to the mineralisation), which have incurred several episodes of brecciation. The Cooley Dolomite commonly hosts coarse-grained sphalerite and galena as veins, disseminations and breccia matrix.
