Oolite composition7/29/2023 Iron-bearing goethitic (limonitic) ooids are probably formed out of volcanic pyroclastic (volcanic ash) material deposited in sea. Especially phosphatic and iron-bearing ooids composed of hematite and goethite seem to have been formed as such. Such ooids are formed by replacement of original calcium carbonate but they may be also primary. Some ooids are made of silica (chert), dolomite or fine-grained phosphatic material (collophane). Ooid sand from Antelope Island, The Great Salt Lake Sometimes ooids form even in human-constructed features such as drainage pipes and Water treatment plant. Even ooids made of evaporite minerals gypsum and halite have been reported. Some ooids form in fresh-water lakes, caves, caliche soils, hot springs, and rivers. Some ooids form in non-marine environments, the Great salt Lake is probably the best known example of ooid formation in saline lake. Most modern ooids are composed of mineral aragonite. However, the exact formation mechanisms are still unresolved. It is believed that ooid formation is generally abiogenic process. Warm water is needed to lower the carbon dioxide content in water (higher temperature reduces the ability of water to keep gases dissolved) and thereby enhance the precipitation of calcium carbonate. This is also the reason why ooids are so well-polished. Ooids are kept moving by waves which enables accretion to occur on all sides. Oolite concentrates containing 36.7 to 48.7 wt% Fe were obtained with heavy liquids but the recovery for a concentrate containing 47.5 wt.% Fe was only 41%.Ooids in these places form a distinct type of sand - ooid sand. Size distribution data show that oolite liberation would increase rapidly with grinding to 93% (71% of the iron) at -65 mesh, but 100% liberation Siderite and if full recovery were achieved the grade of the resulting concentrate would be 43 wt.% Fe. Quantimee image analysis show that for this sample 77% of the iron is present as oolites and Is present as very narrow layers thus it is considered that the only practical method of recovering the iron is by concentrating the oolites and siderite. The oolites have a variable mineralogical composition, but an average oolite consists of 54 wt.% goethite, 42 wt.% amorphous iron-bearing gangue, and 4 wt.% quartz and contains about 43 wt.% Fe. It consists of about 60 wt.% oolites, 20 to 32 wt.% amorphous iron-bearing earthy matrix, 6 wt.% siderite, 4 wt.% quartz, and 1 toĢ wt.% phosphate. The sample contains about 16.5 wt.% adsorbed water and when dried at 100? for 3 hours has 37 wt.% Fe and 1.5 wt.% P?O?. Please note the adoption of the Open Government Licence - CanadaĬanada Mines Branch, Investigation Report IR 74-33, 1974, 21 pages, Open AccessĬanada Department of Energy, Mines and ResourcesĪ sample of iron ore from the Clear Hills deposit in Alberta was studied to determine its mineralogy and the mineralogical characteristics that could affect mineral beneficiation. Grants for technological innovation (IRAP).Directory of scientists and research professionals.Financial and money services regulation.Contact a foreign representative in Canada.Find international study or research opportunities in Canada.International treaties signed by Canada.Find a Canadian scholarship as an international student.COVID-19: Trade, foreign affairs, international trade and development.Global issues and international assistance.Information by countries and territories.International offices and emergency contacts.Transporting dangerous goods - Regulations.Parole, record suspension, expungement and clemency.Policing, justice and emergencies : home.Landmarks and attractions in Canada's capital.Visit the Canadian Virtual War Memorial.Events, celebrations and commemorations.Defence equipment purchases and upgrades.National security and defence Defence: home.Environmental conservation and protection.Environment and natural resources : home.Make a payment to the Canada Revenue Agency.Food and product recalls and safety alerts.Licensed cultivators, processors and seller of cannabis.Sign in to a Government of Canada online account.Make changes to your corporation (Online Filing Centre).Review custom tariffs for importing goods.Consent letter for children travelling abroad.Canadian attractions, events and experiences.COVID-19: Travel, quarantine and borders.Have questions? Find answers in the Help Centre.Find out if you need an eTA or a visa to visit Canada.Sign in or create an account to apply online.Apply for a Social Insurance Number (SIN).
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