pyrites


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pyrites

1. another name for pyrite
2. any of a number of other disulphides of metals, esp of copper and tin

Pyrites

 

pyrite ores consisting predominantly of sulfurous (sulfide) ore minerals. The composition of pyrites is dominated by iron sulfides (pyrite, pyrrhotite, marcasite). Also present are the sulfides of copper (chalcopyrite, bornite), zinc (sphalerite), and lead (galenite) and barium sulfate (barite). Pyrite deposits consist of massive as well as disseminated ores. These deposits have the shape of beds, lenses, stocks, and veins measuring up to 5,000 m long and 250 m thick; they occur at depths of as much as 2,000 m.

In terms of formation and occurrence, pyrites are closely linked to the basic and alkaline igneous rocks that issued onto the floor of ancient seas and formed extended ophiolite zones characteristic of the early stage of geosynclinal development. In the volcanic zones, pyrites form discontinuous chains measuring up to several thousand kilometers long. Pyrites arise in the late stage of volcanic cycles, when the eruption of the primary magma has been replaced by alkaline and acidic lavas, which are accompanied by the heavy venting of volcanic gaseous and liquid solutions. The solutions carry a large amount of metals that combine with the sulfurous sublimates and are deposited in the form of sulfides, creating the pyrites. That portion of the pyrites that arises along the seepage paths of the solutions through the volcanic rock forms hydrothermal metasomatic deposits. The other part of the mineral matter carried by the volcanic solutions reaches the floor of the sea and, in being deposited here, creates the volcanogenic sedimentary deposits of pyrites.

The accumulation of pyrites occurs over a long period of time, and in the early stages, predominantly the sulfurous iron compounds form, which are of limited practical interest. The pyrite deposits of copper, zinc, and lead arise in the later stages.

In the USSR the following pyrite deposits are known: Proterozoic (Karelia), Lower Paleozoic (Buriatia and Tuva), Middle and Upper Paleozoic (Urals and Caucasus), and Mesozoic and Cenozoic (Caucasus) deposits. Abroad, there are Proterozoic (Canada), Lower Paleozoic (Norway and Australia), Middle and Upper Paleozoic (Spain, Portugal), Mesozoic (Yugoslavia), and Cenozoic (Japan, Turkey, Greece, Cuba) deposits.

Pyrite deposits are an important source for obtaining copper, zinc, and lead and, in part, gold, silver, bismuth, cadmium, indium, barium, selenium, sulfur, and sulfuric acid.

REFERENCE

Genezis endogennykh rudnykh mestorozhdenii. Moscow, 1968.

V. I. SMIRNOV

References in periodicals archive ?
During this period the Kilembe mine was exclusively dedicated to copper production although 1.1m tonnes of by-product pyrite concentrates was also generated and stockpiled at Kasese.
PYRITES PLANT (PHASE I) 2Q 19 1Q 19 % 2Q 18 % change change Ore Processed (t) 39,159 47,846 -18.2 11,745 233.4 Production Silver (koz) 333 306 8.8 73 356.2 Gold (oz) 1,215 1,100 10.5 186 553.2 Ore Grades Silver (g/t) 352 267 31.8 452 -22.2 Gold (g/t) 2.57 2.10 22.4 3.37 -23.8 1H 19 1H 18 % change Ore Processed (t) 87,005 11,745 640.1 Production Silver (koz) 638 73 774.0 Gold (oz) 2,315 186 1,144.6 Ore Grades Silver (g/t) 305 452 -32.4 Gold (g/t) 2.31 3.37 -31.5 The leaching plant of the pyrites plant at Saucito contributed 333 koz of silver and 1,215 oz of gold in 2Q19, up 8.8% and 10.5% respectively vs.
Zhang, "Mineralogy of arsenian pyrites and arsenopyrites of Carlin-type gold deposits in Yunnan-Guizhou-Guangxi, "golden triangle" area, southwestern China," Miner.
Furthermore, lower gold ore grades at Cienega, San Julian veins and Saucito negatively impacted gold production, mitigated by higher gold grade at Fresnillo and the contribution from the pyrites plant at Saucito (phase I).
Tenders are invited for Harristown 1 Pyrite Project
"Now according to them pyrites only exist in Ballymun in Dublin.
The finish is highly polished, and the hammer (without its pyrites) is in the open position with the pan cover closed.
The Fe isotope compositions of certain pyrites are consistent with the [delta][sup.56]Fe values of sphalerite (Figure 2).
SODIUM FLUORIDE NaF = FAN STANNIC OXIDE Sn[O.sub.2] = SOON MERCURY OXIDE HgO = HOG SILVER BROMIDE AgBr = BRAG BARIUM OXIDE BaO = BOA SODIUM CHLORIDE NaCl = CLAN MANGANESE DIOXIDE Mn[O.sub.2] = MOON MAGNESIUM OXIDE MgO = MOG SILVER CHLORIDE AgCl = CLAG SODIUM HYDROXIDE NaOH = NOAH OTHER CHEMICAL COMPOUND WORDS THORIUM DIOXIDE Th[O.sub.2] = HOOT CARBON DIOXIDE C[O.sub.2] = COO DEUTERIUM OXIDE [D.sub.2]O = ODD LITHIUM OXIDE Li[O.sub.2] = OLIO IRON PYRITES Fe[S.sub.2] = FESS SODIUM SULPHIDE [Na.sub.2]S = ANNAS ZIRCONIUM DIOXIDE Zr02 = ZORO FORMIC ACID HCOOH = HOOCH (or HC[O.sub.2]H) SUSAN THORPE