Ore Body

Also found in: Dictionary, Thesaurus, Medical.
Related to Ore Body: Mineral deposit
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Ore Body


the general name for an accumulation of ore in any shape. An ore body may correspond to an ore deposit, but more often the deposit includes several ore bodies. The boundary between an ore body and the enclosing rocks may be distinct and discernible to the eye. On the other hand, it may be indistinct, with a gradual transition from the ore body through a zone of impregnated low-grade ores and weakly mineralized rocks to the enclosing rocks. When indistinct, the boundary of the ore body is established during the sampling process, based on the minimum allowable content of metal or mineral in the ore.

Three groups of ore bodies are distinguished by shape: isometric, flat, and elongated in one direction. Isometric ore bodies are accumulations of mineral substance that are approximately equal in all measurements. They include stocks, stockworks, and pockets, relatively small accumulations of ore that are isometric in shape and usually not more than 1–3 m in cross section.

Flat ore bodies—sheets, veins, and lenses—have two long dimensions and one short dimension. The sheet, the most common shape in which sedimentary deposits occur, is a tabular body separated from other rocks by bedding planes. A distinction is made between simple sheets and complex sheets, which have rock interlayers. Sheetlike deposits differ from sheets in their smaller dimensions, discontinuity, and lesser stability of thickness. They are typical of weathering deposits.

Veins are ore bodies formed when a mineral substance fills fracture cavities or when there is metasomatic substitution of mineral substances for rocks along cracks. The plane of contact between the vein and the enclosing rocks is called the selvage. The zones of mineralized lateral rocks of veins create a contact metamorphic aureole that sometimes contains industrial concentrations of valuable components. Where the minerals that fill the veins are unevenly distributed, there is an alternation of sections rich and poor in valuable components; the rich sections in the body of the vein are called ore shoots. Ore shoots may be morphological or concentrated. The former are formed by bulges in the vein, whereas the latter are zones having an increased concentration of valuable components unrelated to change in the morphology of the ore body but rather caused by local alterations of the physicochemical parameters of ore deposition. The latter are sometimes related to the ability of the ore-enclosing rocks to react chemically with solutions. Sometimes they result from a sharp change in the temperature and pressure of solutions, the change leading to a large-scale accumulation of ore minerals.

A lens is a lenticular geological body that tapers out markedly in all directions; its thickness is slight compared to its length. In terms of morphology, lenses and lenticular beds are transitional formations between isometric and flat ore bodies.

Ore bodies elongated in one direction are called ore pipes or pipes. Ore pipes are oval in cross section. They form when an ore substance from magmatic melts or hydrothermal solutions is concentrated; the melts or solutions penetrate from the abyssal parts of the earth’s crust along the line where tectonic fractures intersect or along fractures that intersect easily penetrated rock strata. Sometimes, when melts or hot vapors and gases break through a bed of rock, diatremes are formed; examples are the diamond-bearing kimberlite pipes of Siberia and South Africa. There are ore pipes composed of copper, lead-zinc, and tin; they are up to several kilometers long, and their width in cross section varies from a few meters to several hundred.


Smirnov, V. I. Geologiia poleznykh iskopaemykh, 2nd ed. Moscow, 1969.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
3 ore body or following up on last years' copper intercepts.
2017 due to the first full year of operations at San Julian (Phase II / Disseminated ore body) following its commissioning in July 2017, and the higher ore grade and recovery rate at Saucito.
In the fourth Stage, uranium ore bodies developed as a result of complete leaching of pre existing paleo-channel ore body. These were then re-precipitated horizontally below the surface exposure of anomaly in reduced zone below the water table.
Drilling into one of the targets in May 2010 (see ASX release dated 7th July 2010) highlighted Perseverance style mineralisation to the north of the main Perseverance ore body. This drilling delineated a target of over 140 metres in strike and 200 metres in dip with intersections including:
Though Noranda had drilled more than 100 holes when it explored the Lynne ore body, Burns said Tamerlane would likely drill 10 to 20 holes to confirm the deposit.
When the overburden is too deep, the ore body is not mined by open pit, but a crown pillar is left in place of height the same as if it were.
Also, if the relief on the surface of the ore body is variable, the reflection amplitudes will be attenuated.
2017 principally due to San Julian (Phase II/Disseminated ore body) operating for the full year, doubling production year on year.
Recently reports surfaced by a scientist and Department of Natural Resources that asbestos fibers are in at least part of the ore body that Gogebic Taconite hopes to mine.
SRK expects the proven and probable component of the company's ore body to contain about 2.94bn pounds of contained rare earth oxide (REO) equivalent, when compared to the previous estimate of 2.24bn pounds of contained REO product.