(a) magmatic ore deposits, (b) hydrothermal ore deposits, (c) sedimentary ore deposits, (d) residual ore deposits, (e) placer ore deposits.
Examples: 1  The copper concentration in copper ore deposits has shown changes throughout history. 2  From 1880 to about 1960 the grade of copper ore showed a steady decrease from about 3% to less than 1%, mainly due to increased efficiency of mining. 1 Explain how each of the following types of ore deposits form and give examples of each (a) magmatic ore deposits, (b) hydrothermal ore deposits, (c) sedimentary ore deposits, (d) residual ore deposits, (e) placer ore deposits. The results of mineral concentration are two main products: the concentrate and tailings. In some cases (for example, in the concentration of asbestos or anthracite), the concentrates differ from the tailings mainly in the size of mineral particles. Ores containing minerals that undergo changes at high temperatures—for example, loss of water of crystallization or CO2, changes in magnetic susceptibility or density, or cracking—may be prepared for subsequent concentration by roasting. Crushing, a form of comminution, one of the unit operations of mineral processing. In the field of extractive metallurgy, mineral engineering, mineral processing, also known as mineral dressing or ore dressing, is the process of separating commercially valuable minerals from their ores. The purpose of dewatering is to remove water absorbed by the particles which increases the pulp density. This is done for a number of reasons, specifically, to enable ore handling and concentrates to be transported easily, allow further processing to occur and to dispose of the gangue. Copper-Most copper ore bodies are mined from minerals created by weathering of the primary copper ore mineral chalcopyrite. Minerals in the enriched zone include chalcocite, bornite, djurleite. Minerals in the oxidized zones include malachite, azurite, chyrsocolla, cuprite, tenorite, native copper and brochantite. Most elements need to be concentrated into amounts that can be economically mined from ore deposits (usually hundreds to thousands of times their crustal abundance). As of 2005 Chalcopyrite ore is extensively mined in Chile, the United States, Canada, Zambia, Kazakhstan, Mauritania and Poland. In the United States, the states of Arizona, Montana, New Mexico, and Utah lead in ore mining. Indeed, the world’s largest copper mine, the Chuquicamata, is located in Atacama, Chile. Concentration. All copper sulfide ores are concentrated using the froth flotation process. Ground ore is mixed with xanthate reagents (for example, pine oil), which reacts with the copper sulfide mineral to make it hydrophobic on its surface. The ores must be processed to extract the metals of interest from the waste rock and from the ore minerals. Ore bodies are formed by a variety of geological processes. The process of ore formation is called ore genesis. An ore deposit is an accumulation of ore. This is distinct from a mineral resource as defined by the mineral resource classification criteria. An ore deposit is one occurrence of a particular ore type. For example, 50-percent concentrates may be obtained from molybdenum ores containing 0.1 percent molybdenum. Concentration of minerals is performed by means of a series of consecutive operations, which constitute the enrichment program. Ores containing minerals that undergo changes at high temperatures—for example, loss of water of crystallization or CO2, changes in magnetic susceptibility or density, or cracking—may be prepared for subsequent concentration by roasting. 1 From 1880 to about 1960 the grade of copper ore showed a steady decrease from about 3% to less than 1%, mainly due to increased efficiency of mining. 2  From about 1960 to 1980 the grade increased to over 1% due to increasing costs of energy and an abundant supply produced by cheaper labor in other countries. 1 Explain how each of the following types of ore deposits form and give examples of each (a) magmatic ore deposits, (b) hydrothermal ore deposits, (c) sedimentary ore deposits, (d) residual ore deposits, (e) placer ore deposits. An ore is a type of rock that contains sufficient minerals with important elements including metals that can be economically extracted from the rock. The ores are extracted from the earth through mining; they are then refined (often via smelting) to extract the valuable element, or elements. An ore deposit is an accumulation of ore. This is distinct from a mineral resource as defined by the mineral resource classification criteria. An ore deposit is one occurrence of a particular ore type. The crushed copper ore (containing, for example, 0.75% Cu and 0.015% Mo) is fed to the grinding circuit where water is added and the ore is ground to the proper size. Lime and an oil for collecting molybdenum are usually added in the grinding circuit. A copper collector may also be added at this point. Froth Flotation. Froth flotation is considered to be the most widely used method for ore beneficiation. In ore beneficiation, flotation is a process in which valuable minerals are separated from worthless material or other valuable minerals by inducing them to gather in and on the surface of a froth layer.
http://www.tulane.edu/~sanelson/eens1110/minresources.htm http://encyclopedia2.thefreedictionary.com/Concentration+of+Minerals https://en.wikipedia.org/wiki/Mineral_processing http://www.minsocam.org/msa/collectors_corner/article/oremin.htm http://www.copper.co.za/copper-education/sources-of-copper-ore/ https://en.wikipedia.org/wiki/Ore http://encyclopedia2.thefreedictionary.com/Concentration+of+Minerals http://www.tulane.edu/~sanelson/eens1110/minresources.htm https://en.wikipedia.org/wiki/Ore http://www.cpchem.com/bl/specchem/en-us/Pages/IntroductiontoMineralProcessing.aspx
what are ore concentrates examples