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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.

The grade or concentration of an ore mineral, or metal, as well as its form of occurrence, will directly affect the costs associated with mining the ore. The cost of extraction must thus be weighed against the metal value contained in the rock to determine what ore can be processed and what ore is of too low a grade to be worth mining. Metal ores are generally oxides, sulfides, silicates, or "native" metals (such as native copper) that are not commonly concentrated in the Earth's crust, or "noble" metals (not usually forming compounds) such as gold. 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.


The Öre is the centesimal subdivision of the Swedish krona. In the Swedish language, the plural and singular of öre are the same in the indefinite forms, whereas the singular definite form is öret and the plural definite is ören. The name derives from the Latin aureus (golden), the name of a coin worth 25 denarii. The corresponding subdivisions of the Norwegian and Danish krones are called øre.

Ore (disambiguation)

Ore is a term for mineral deposits.

Ore may also refer to:

Ore (album)

is the commercial debut album of Japanese ska band, OreSkaBand, released on July 19, 2006.

The Collaborative International Dictionary


Ore \Ore\ ([=o]r), n. [AS. [=a]r.] Honor; grace; favor; mercy; clemency; happy augury. [Obs.]


Ore \Ore\, n. [AS. [=o]ra; cf. [=a]r brass, bronze, akin to OHG. [=e]r, G. ehern brazen, Icel. eir brass, Goth. ais, L. aes, Skr. ayas iron. [root]210. Cf. Ora, Era.]

  1. The native form of a metal, whether free and uncombined, as gold, copper, etc., or combined, as iron, lead, etc. Usually the ores contain the metals combined with oxygen, sulphur, arsenic, etc. (called mineralizers).

  2. (Mining) A native metal or its compound with the rock in which it occurs, after it has been picked over to throw out what is worthless.

  3. Metal; as, the liquid ore. [R.]

    Ore hearth, a low furnace in which rich lead ore is reduced; -- also called Scotch hearth.

Longman Dictionary of Contemporary English


iron ore (=rock that contains iron)
iron ore
▪ Earlier studies on the deposit indicated the copper ore can be treated using conventional methods.
▪ Information was being shovelled back and forth like iron ore or stone.
▪ It soon ventured into steelmaking to use its coal and iron ore.
▪ These were a series of ore bodies which occurred in a 5 m thick sandstone unit and became zinc-rich towards the east.
▪ Until evidence of such ore bodies can be produced, skepticism regarding their existence is fully justified.
▪ So they want a shitload of land around the ore body -- three or four times what they actually need.
ore deposits
▪ uranium ore
▪ As the granite cooled it squeezed out hot fluids containing mineral ores in solution.
▪ Earlier studies on the deposit indicated the copper ore can be treated using conventional methods.
▪ In fact, things have never looked ore promising for the future of transportation.
▪ In the uranium mines, workers breathe in radioactive dust as they dig out the metal ore which contains the valuable element.
▪ It found itself amongst the stockwork of veins and rich ore was being found continually.
▪ So they want a shitload of land around the ore body -- three or four times what they actually need.
▪ These ores were deposited from basinal brines rich in calcium chloride.
▪ When rain water hits pyrite ore, it forms sulfuric acid, which leaches out copper and other metals.


n. rock that contains utilitarian materials; primarily a rock containing metals or gems which—at the time of the rock's evaluation and proposal for extraction—are able to be separated from its neighboring minerals ''and'' processed at a cost that does not exceed those materials' present-day economic values.

Douglas Harper's Etymology Dictionary


12c., a merger of Old English ora "ore, unworked metal" (related to eorþe "earth," see earth; and cognate with Low German ur "iron-containing ore," Dutch oer, Old Norse aurr "gravel"); and Old English ar "brass, copper, bronze," from Proto-Germanic *ajiz- (cognates: Old Norse eir "brass, copper," German ehern "brazen," Gothic aiz "bronze"), from PIE root *aus- (2) "gold" (see aureate). The two words were not fully assimilated till 17c.; what emerged has the form of ar but the meaning of ora.



  1. n. a metal-bearing mineral valuable enough to be mined

  2. a monetary subunit in Denmark and Norway and Sweden; 100 ore equal 1 krona


Usage examples of "ore".

Again, if the ore is washed with water before treating with cyanide on the large scale, then the assay should be made of the acidity of the ore after a similar washing.

It may happen that with an unknown ore the first assay will be more or less unsatisfactory: but from it the necessity for adding more or less flour will be learnt, and a second assay, with the necessary modification of the charge, should give a good result.

There at present nothing is talked of but copper mines and silver or argentiferous copper ores.

Ores of Lead -- Geographical Distribution of the Lead Industry -- Chemical and Physical Properties of Lead -- Alloys of Lead -- Compounds of Lead -- Dressing of Lead Ores -- Smelting of Lead Ores -- Smelting in the Scotch or American Ore-hearth -- Smelting in the Shaft or Blast Furnace -- Condensation of Lead Fume -- Desilverisation, or the Separation of Silver from Argentiferous Lead -- Cupellation -- The Manufacture of Lead Pipes and Sheets -- Protoxide of Lead -- Litharge and Massicot -- Red Lead or Minium -- Lead Poisoning -- Lead Substitutes -- Zinc and its Compounds -- Pumice Stone -- Drying Oils and Siccatives -- Oil of Turpentine Resin -- Classification of Mineral Pigments -- Analysis of Raw and Finished Products -- Tables -- Index.

The largest asteroid in this sector had deposits of armalcolite ore they needed to fix the Oltion circuits in the warp processor.

Its chief ores are smaltite and cobaltite, which are arsenides of cobalt, with more or less iron, nickel, and copper.

The assayer, however, uses the sample which he has dried for his moisture-determination, as the dry ore on which he makes his other assays, and no variation in moisture would influence the other and more important determinations.

But they are treated here because they owe their importance to their use in the extraction of gold and because their determination has become a part of the ordinary work of an assayer of gold ores.

Many assayers use flasks, though of a smaller size, for the ordinary partings in assaying gold ores.

The bad effect of a higher temperature in increasing the cupellation loss need hardly be considered in the case of such small buttons of gold as are obtained in assaying gold ores, as any loss there may be is hardly appreciable by the balance.

And in the parting of such gold buttons as are obtained in assaying ores it is well to aim at this proportion, though absolute precision is not a matter of importance.

It is certainly the most ready and expeditious mode of determining the commercial value of a parcel of tin ore, which, after all, is the main object of all assaying operations.

Yet there was one who made the Zulu people out of nothing, as a potter fashions a vessel from clay, as a smith fashions an assegai out of the ore of the hills, yes, and tempers it with human blood.

More important, however, were the assay reports, prepared by experts, stating that the loose ore found in the Aureole Mine was rich in gold.

The exhibits included specimens of gold dust from the Aureole and actual samples of the glittering ore.