|
Find more facts and information on our topic page about
ore
|
ore
The Columbia Encyclopedia, Sixth Edition
ore metal-bearing mineral mass that can be profitably mined. Nearly all rock deposits contain some metallic minerals, but in many cases the concentration of metal is too low to justify mining the ore. Ores are usually found concentrated in deposits with a definite gradation of metal concentration from the ore to the surrounding rock. The ore often occurs in veins, which are ore-filled fissures in the rock. The veins vary in thickness from only fractions of an inch to several hundred feet. Minerals with no commercial value, called gangue minerals, are usually found mixed with the ore in the vein. Some veins are buried deep within the ground, but others lie close to the surface. Veins of ore exposed to weathering are often eroded and redeposited in placers and alluvial deposits, e.g., ore-bearing stream and lake gravels or beach sands. Some ores are simple chemical compounds, while others are chemically complex minerals . Important ores of aluminum , iron , manganese , and tin are oxides; important ores of antimony , copper , lead , mercury , nickel , silver , and zinc are sulfides. Some metals, called native metals, occur uncombined in nature, e.g., copper, gold , platinum , and silver. The recovery of metals from their ores is one area of the field of metallurgy .
Find more facts and information related to the .
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
Related newspaper, magazine, and trade journal articles from HighBeam Research
(Including press releases, facts, information, and biographies)
|
The fire test for ores.(Brief Article)
; ...the first test of ores supposed to contain...a quantity of the ore is pulverized until...the nature of the ore. Some heavy lead or galena ores require very little litharge. Other ores which contain little...of sulphur in the ore, iron nails are added...
Read more
|
|
Vale Inco Tracks Ore with RFID Tags
; ...tags, or "ore pills" as they are commonly called, to track ore in real time. A geologist visits each blast site and tosses a few ore pills into the muck pile and a network of strategically placed RFID readers tells the mine what ore is moving where; it also tells the mine the average ore ...
Read more
|
|
Ore definition in Shurugwi Chrome Mines, Zimbabwe.
; ...t/y). Since 1906, ore in Shurugwi has experienced...of those high grade ores that contained high...dilution levels of ore by physical removal...chromic content is ore. When the chromic...4.6 for high grade ores, to 4.0 for low grade ores. The magnetic properties...considerations The ...
Read more
|
 "The Economist (US)")
|
Some like it hot. (extracting gold from sulphide ores)
; ...tiny impurities in sulphide ores. Now, with more of the world...to extract gold from sulphide ores than from oxide ore. But much of the world's remaining...produced by bioleaching sulphide ore will be $200 an ounce-not much...firm to produce gold from oxide ore. The capital cost of the ...
Read more
|
|
|
Small capacity processing plants. (ore processing plants)
; ...plant for lode type ores with throughput capacity...than about 200 t/d of ore (50,000 t/y or less...about 10-200 t/d of ore for batch or semi...tin and tungsten ores for example, to continuous...small mines sell their ores to nearby private...water per unit of ore throughput and ...
Read more
|
|
|
SNIM inaugurates M'Haoudat iron ore mine, Mauritania. (Societe Nationale Industrielle et Miniere)
; ...company's production levels of iron ore are maintained as the Kedia d'Idji...Mauritanian Tiris for direct-shipping ore, the M'Haoudat deposit was discovered...Mineable reserves of all types of ore are estimated to be 100 Mt. The characteristics of the M'Haoudat ores were determined by ...
Read more
|
|
|
Denison Begins Uranium Ore Processing at Utah Mill
; Denison Mines Corp. reported that processing of conventional ore at its White Mesa mill in Utah began in late April. According...testing of the grinding circuit began on April 21, with the first ore from the Tony M mine fed to the leach circuit on April 28...the next 30 to 45 days, the mill would process ...
Read more
|
|
The Process Mineralogy of Gold: The Classification of Ore Types
; ...cause of refractory ores.7-9 For example, a typical refractory ore from the Eastern Goldfields...gold. That is, the ore contains 42% refractory...Australian greenstone gold ores, it is almost always...of these refractory ores the gold is effectively "locked" within the ore (locked in ...
Read more
|
|
Impact of microwave irradiation on the processing of a sulfide ore
; ...for the processing of amenable ores. The application of microwave...refractory and finely disseminated ores is of great interest because...and mineral liberation, sized ore samples were subjected to microwave...interest in thermal pretreatment of ores can be attributed to the need...
Read more
|
|
|
Mining methods at the Rodina Mine. (Ukranian iron ore mine)
; ...underground mining methods are employed at this Ukrainian iron ore mine The iron-ore field of Krivoy Rog is one of the largest in the world and constitutes the main source of iron ore for the Ukraine iron and steel industry. It is located in the...strengths ranging from 40-60 to 180-200 MPa. The rich ...
Read more
|
For more facts and information,
see all related premium articles
Related entries from encyclopedias, dictionaries, and thesauruses
|
ore minerals
ore minerals Ore minerals are economically valuable minerals that through various methods...sulphides associated with valuable copper sulphides in a copper deposit are ore minerals. However, the term ‘ore minerals’ is also encountered...
Read more
|
|
|
ore deposits
ore deposits Ores are naturally occurring rock materials consisting of one or more minerals from which a valuable constituent...profit. The locations in the Earth's crust where these accumulations occur are collectively referred to as orebodies, ore reserves, or ore deposits. The definition of an ...
Read more
|
|
SIC 1011 Iron Ores
...primarily engaged in producing pig iron from iron ore are classified in SIC 3312: Steel Works, Blast...and Rolling Mills. NAICS Code(s) 212210 (Iron Ore Mining) Industry Snapshot Virtually all of the iron ore mined in the world is used in steel making...
Read more
|
|
bog iron ore
Iron ore consisting of hydrated iron oxide minerals such...Bacterial action contributes to formation of the ore. Economically useful deposits can regrow within...used as a source of iron in the past. bog iron ore bog iron ore bog iron ore
Read more
|
|
|
SIC 1021 Copper Ores
...primarily engaged in the recovery of copper concentrates by precipitation and leaching of copper ore. NAICS Code(s) 212234 (Copper Ore and Nickel Ore Mining) Industry Snapshot A global commodity business, copper mining and milling is subject to swings...
Read more
|
