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A variety of mines occur in New South Wales, including Broken Hill Ore Deposit the world's richest zinc and silver mine; Bowdens Silver Deposits near Mudgee; Cadia-Ridgeway Mine 20 km south of Orange; Lake Cowal Campaign and Barrick Gold 125 km sw of Parkes; CSA Mine near Cobar mines copper; Endeavour Mine extracts zinc, is 43 km nw of Cobar ...
These deposits occurred during the Ordovician period. The ocean floor was distant from the continental source of the sediment. Towards the end of this period there were isolated parts where no turbidity currents reached and only fine clay and animal organic and silica debris were deposited into oxygen-depleted deep water. This ocean basin has ...
Exposed Ashfield Shale of the Wianamatta group, by the Pacific Highway, Chatswood, Australia. The Wianamatta Group is a geological feature of the Sydney Basin, New South Wales, Australia that directly overlies the older (but still Triassic in age) Hawkesbury sandstone and generally comprise fine grained sedimentary rocks such as shales and laminites as well as less common sandstone units.
Exposed ironstone outcrops along the ridgeline and clay deposits provided a significant source of red and yellow and white ochres. Archeological investigations of the site during the 1980s and 1990s uncovered some 200 artefacts that indicate Gubur Dhaura was an important site for ochre extraction and processing.
The sea withdrew, and later in the Eocene, silt and clay of the Olney Formation [5] were deposited. One minor sea incursion in the Late Eocene resulted in the Buccleuch Formation [6] in South Australia. The group of deposits is termed the Renmark Group and was earlier known as the Knight Group. [7]
Gay Head Cliffs in Martha's Vineyard consist almost entirely of clay. A Quaternary clay deposit in Estonia, laid down about 400,000 years ago. Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4).
Basic geological regions of Australia, by age. The geology of Australia includes virtually all known rock types, spanning a geological time period of over 3.8 billion years, including some of the oldest rocks on earth. Australia is a continent situated on the Indo-Australian plate.
It attracts more than half of Australia's minerals exploration expenditure, and produces two thirds of all gold and most of the nickel mined in Australia. The craton contains some 30% of the world's known gold reserves, [ citation needed ] [ disputed – discuss ] about 20% of the world's nickel reserves, 80% of the world's tantalum reserves ...