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Irvine Island is located off the Kimberley coast of Western Australia in the Buccaneer Archipelago. It is about north-east of Broome, north of Derby and hosts an unmined deposit of iron ore. Irvine Island has a surface area of and is west of Cockatoo Island. == Geology and mineralisation == Irvine Island is one of three Islands forming the Kimberley Iron Ore Hub. The other two islands, Koolan and Cockatoo have been in productive mining for over 50 years.〔(Mining in the Kimberley. ) Kimberley Development Commission.〕 Iron mineralisation at the Hub is much younger than the deposits of the Pilbara and is contained within sedimentary rocks as visible dark brown bands within the otherwise pale brown and generally repetitive sandstones. However, one layer in particular, the Yampi Member, contains very high concentrations of iron and has been the primary focus of exploration and mining activity in the region. This layer outcrops on all three islands of the Hub making it the closest iron ore deposit in Australia to Asia.〔(The Geology of Irvine Island. ) Pluton Resources Ltd.〕 The Yampi Member is a ferruginous clastic sedimentary rock and constitutes the upper part of the Pentecost Sandstone. On Irvine, it unconformably overlies the Elgee Siltstone and is characterised primarily by dark grey haematite and magnetite quartz sandstone and quartz pebble conglomerate.〔(Explanatory notes on the Yampi 1:250 000 geological sheet, Western Australia. ) Department of Minerals and Petroleum. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Irvine Island」の詳細全文を読む スポンサード リンク
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