gangue mineral in a sentence

Most copper ores contain only a small percentage of copper metal bound up within valuable ore minerals, with the remainder of the ore being unwanted rock or gangue minerals, typically silicate minerals or oxide minerals for which there is often no value.
Spoil heaps from the abandoned lead mines can still be seen, and since the last quarter of the twentieth century have been the focus of attention for the recovery of gangue minerals in present mining, such as fluorspar for the smelting of aluminium.
The supergene sulfide zone is present from about 35 to 65 m in depth and has significant copper enrichment, with predominantly chalcocite, and lesser digenite, covellite, and bornite, along with pyrite, minor pyrrhotite, anglesite, and gangue minerals.
An aqueous solution as a dense medium is used in coal processing in the form of a belknap wash and suspensions in air are used in water-deficient areas, like areas of China, where sand is used to separate coal from the gangue minerals.
Gangue minerals included calcite, quartz, epidote, native form and naturally alloyed with the copper . " Halfbreed " is the term for an ore sample that contains the pure copper and pure silver in the same piece of rock; it is only found in the native copper deposits of the Upper Peninsula of Michigan.

Copper ores containing chalcopyrite can be concentrated to produce a concentrate with between 20 % and 30 % copper-in-concentrate ( usually 27 29 % copper ); the remainder of the concentrate is iron and sulfur in the chalcopyrite, and unwanted impurities such as silicate gangue minerals or other sulfide minerals, typically minor amounts of pyrite, sphalerite or galena.
In 2006, 5.29 million tonnes of crushed stone ( mostly limestone or dolomite ) was used as a flux in blast furnaces and in certain steel furnaces to react with gangue minerals ( i . e . silica and silicate impurities ) to produce liquid slag that floats and can be poured off from the much denser molten metal ( i . e ., iron ).

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