Mineral Deposit


Also found in: Wikipedia.

mineral deposit

[′min·rəl di‚päz·ət]
(geology)
A mass of naturally occurring mineral material, usually of economic value.

Mineral Deposit

 

an accumulation of natural mineral raw material of industrial significance. Mineral deposits of sedimentary origin occur in layers (for example, deposits of coal, salts, phosphorites, aluminum and manganese ores, and limestone) that are often intensively deformed—bent into folds and broken by faults. Mineral deposits in the crust of weathering (iron and nickel ores and other residua) may have a mantle-like, platelike, pocket, or vein form. Deposits of endogenous beds of copper, lead, zinc, tungsten, tin, and gold usually occur in veins; they may also occur in the form of lenses, pipes, stocks, and nests composed of massive ores or in the form of stock works formed by vein-impregnated ores.

Deposits of petroleum and gas are divided into sheet and massive deposits. In sheet deposits the accumulation of petroleum and gas is related to strictly defined strata—the collectors. Massive petroleum and gas deposits fill up protrusions of permeable rock, which are enclosed from above by impervious layers; they are subdivided into deposits in structural, reef, salt, and erosion protrusions.

REFERENCE

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

Mineral Deposit

 

an accumulation of mineral matter on the surface or in the earth’s interior that results from geological processes and whose quantity, quality, and conditions of bedding make it suitable for industrial use. Deposits may be gaseous (hydrocarbon fuel gases, as well as noncombustible gases, such as helium, neon, argon, and krypton), liquid (petroleum and subterranean water), or solid (precious elements, crystals, minerals, and rocks). Mineral deposits are divided into metalliferous, nonmetalliferous, fuel (caustobioliths), and hydromineral types, according to industrial use. Deposits of subterranean waters (drinking, industrial, balneological, or mineral waters, as well as waters in productive oil strata that contain bromine, iodine, boron, radium, and other elements in sufficient quantity for extraction) differ from other mineral deposits in that the reserves are replaceable. The minimum quantity of mineral and lowest grade of quality for exploitation are called the industrial conditions.

Mineral deposits may emerge at the earth’s surface (open deposits) or be buried underground (closed, or concealed, deposits). Deposits are subdivided into series according to conditions of formation (sedimentogenic, magmatogenic, and metamorphogenic), and the series in turn are broken down into groups, classes, and subclasses.

Sedimentogenic (surface and exogenous) mineral deposits were formed at the surface or in the surface zone through chemical, biochemical, and mechanical differentiation of mineral substances caused by the earth’s external energy. Three groups of mineral deposits are identified within the sedimentogenic series: (1) weathering, (2) placer, and (3) sedimentary.

Magmatogenic (deep-seated and endogenous) mineral deposits were formed in the earth’s interior through geochemical differentiation of mineral substances caused by the appearance of magma and its effect on the environment owing to sources of energy within the earth. Five basic groups are identified within this series: (1) magmatic, (2) pegmatite, (3) carbonatite, (4) skarn, and (5) hydrothermal.

Metamorphogenic mineral deposits originated in the process of regional and local metamorphism of rocks. In accordance with the accepted division of geological history, a distinction is made among mineral deposits of Archean, Proterozoic, Riphean, Paleozoic, Mesozoic, and Cenozoic age. A further distinction is made among deposits whose matter comes from subcrustal (mantle or basalt) and crustal (or granite) magma, as well as the earth’s sedimentary shell. According to place of formation, deposits are subdivided into geosynclinal (folded regions) and platform deposits. Four levels of formation of mineral deposits below the earth’s surface are known: ultraabyssal (more than 10–15 km), abyssal (from 3–5 to 10–15 km), hypabyssal (from 1.0–1.5 to 3–5 km), and near-surface (to depths of 1.0–1.5 km).

REFERENCES

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

V. I. SMIRNOV

References in periodicals archive ?
In a new paper published in the journal (https://pubs.geoscienceworld.org/gsa/geology/article/570813/A-widespread-olivinerich-ash-deposit-on-Mars) Geology , however, researchers revealed that a mineral deposit captured in images by NASA's Mars Reconnaissance Orbiter could be definite proof of the Red Planet's active volcanic eruptions billions of years ago.
(NASDAQ: OMEX), has agreed to acquire an 80% interest in a holding company whose primary asset is an exclusive license for a mineral deposit from New York, US-based Seabed Capital LLC to diversify mineral portfolio, the company said.
Odyssey Marine has entered into a letter of intent with Seabed Capital to acquire from Seabed an 80% interest in a holding company whose primary asset is an exclusive license for a potentially significant subsea mineral deposit. Total consideration for this acquisition is 250,000 shares of Odyssey common stock and an agreement that will pay Seabed a 2.5% net smelter royalty from future mine production.
With such a valuable mineral deposit discovered by GSP in Balochistan Pakistan should consider itself extremely fortunate.
He had heard that a valuable mineral deposit used in Chinese medicine formed in the stomachs of porcupines.
The price index of the mineral deposit is Net Present Value (NPV), Cumulative Cash Flow (CCF) and other indexes (Rybar, et al., 2000, Rybar and Cehlar, 1997).
Mario Caron, president and CEO of Aldridge, said, 'Since Aldridge began to implement a change in management in the fall of 2011, our focus has been to advance our Yenipazar project in Turkey given the significant size of its mineral deposit, access to skilled labour and modern infrastructure, and support from local stakeholders.'
Burns said Tamerlane is attracted to that mineral deposit because the company wouldn t have to spend money exploring for something that may not exist.
6 : a discovery of a valuable mineral deposit <an oil strike>
The court explained its rationale for the different outcomes as follows: In one case an overriding royalty would last until the mineral deposit was exhausted, while in the other situation a carved-out royalty ended after a stated time of production.
Depending on the mineral deposit, that process can take hundreds to thousands of years.
Expenditures that a taxpayer makes for mine equipment due to a shortage of manpower or a change in the seam thickness of a mineral deposit do not qualify for receding-face treatment.