Can the classification of a mineral as an ore change? Yes if the cost of mining the mineral becomes higher than the value of the ore. Or the supply demand decreases. How are ores deep beneath Earth's surfaces removed? By underground mining. How are ores near Earth's surface removed?

Ore - Wikipedia

Classification of ore deposits. Classification of hydrothermal ore deposits is also achieved by classifying according to the temperature of formation, which roughly also correlates with particular mineralising fluids, mineral associations and structural styles.

Jul 29, 2013· They may also be formed through biologic processes, such as coral reef formation. Mineral deposits may form in sedimentary rocks through the erosion of ore-bearing rocks or through the mobilization of ore-bearing fluids through sedimentary rock. Examples: Sediments eroded from older rocks: Sandstone hosted copper

Nov 06, 2019· The classification of ores depend on thier composition, a bauxite deposit could be classified as metal deposit (when we mine the ore for aluminium), as well as a mineral deposit (when we mine the ore for the bauxite mineral). Hydrocarbons are, of course, first and foremost fuels, but significant amounts of sulfur are extracted from petroleum ...

Platinum ores nearly always form in strongly basic rocks that are also commonly rich in iron, chrome and nickel. Many of them form via some process of magmatic segregation from molten rock as it cools in the earth. Unlike gold and silver ores, platinum ores are almost never present in quartz veins.

Antlerite may be emerald to very dark green and has a pale green streak. All four minerals may form as the product of secondary alteration of copper sulfides such as chalcocite (Cu2S). Melanterite is an iron ore which is formed by the oxidation and hydrothermal …

Mineral - Mineral - Classification of minerals: Since the middle of the 19th century, minerals have been classified on the basis of their chemical composition. Under this scheme, they are divided into classes according to their dominant anion or anionic group (e.g., halides, oxides, and sulfides). Several reasons justify use of this criterion as the distinguishing factor at the highest level ...

Sedimentary ore deposits include banded iron formations, and gold, platinum, zinc, tin, and even diamond-containing ores that formed in sedimentary environments. Lastly, ores can form as a result ...

screening and classification of ores - ladidans.nl. Rotaspiral Screen - CEC Mining Systems. FINE SCREENING AND SIZE CLASSIFICATION DOWN TO 75 MICRONS. The CX-PSS Rotaspiral Screen (RS) is an evolution for a conventional drum screen system that removes wood fibre, trash, and oversize particles from slurried, processed ores

Ores and Concentrates An industry approach to EU Hazard Classification 1 The extraction and processing of mineral ores to create concentrates is the primary step in the life cycle of minerals and metals, and management of the

Classification of tungsten ores; Tungsten ores; Tungsten does not occur naturally in its pure metallic state; rather, it is found in several ores, but only two kinds of tungsten-bearing mineral rocks, called wolframite and scheelite, are mined commercially. Wolframite accounts for about 70% of the total tungsten resources in the world, and scheelite accounts for about 30%.

Chapter 163A Offender Reporting and Classification Reporting § 163A.005: Definitions for ORS 163A.005 to 163A.235 § 163A.010: Reporting by offender discharged, paroled or released from correctional facility or another United States jurisdiction § 163A.015:

Jun 25, 2013· Upon inspection of the list one would notice the absence of China, Russia and India. These countries use similar, but in most cases more elaborate classification schemes. The difference between a resource and reserve basically boils down one thing: a feasibility study. Not included in the classification, but often mentioned is a mineral occurrence.

Mineral classification can be an organizational nightmare. With over 3,000 different types of minerals a system is needed to make sense of them all. ... This group ranges from dull ores like bauxite to gems like rubies and sapphires. The magnetite pictured to the left is a member of this group. Sulfides Sulfides are made of compounds of sulfur ...

Rare Earth Ore Classification. Classification of ores related to alkaline rocks is also controversial. Table 2 presents a relatively simple classification that follows analogous categories for deposits related to nonalkaline igneous rocks. Some of the more unusual alkaline rocks that host, or are related to, REE ores are carbonatite and phoscorite, igneous rocks composed principally of ...

Waldemar Lindgren, Swedish-born American economic geologist noted for a system of ore classification that he detailed in his book Mineral Deposits (1913). Lindgren graduated in 1882 as a mining engineer from the Freiberg Mining Academy in Germany. Following a year of …

The principal gold minerals that affect the processing of gold ores are native gold, electrum, Au-Ag tellurides, aurostibite, maldonite, and auricupride. In addition, submicroscopic (solid solution) gold, principally in arsenopyrite and pyrite, is also important. The main causes of refractory gold ores are submicroscopic gold, the Au-Ag tellurides, and very fine-grained gold (<10 µm) locked ...

③Low grade manganese ore (25%-35% Mn) Classification according to chemical constituents; Manganese is found in more than 100 minerals including various sulphides, oxides, carbonates, silicates, phosphates and borates. The most commonly occurring manganese-bearing minerals:

Oct 22, 2017· INTRODUCTION The purpose of any classification is to group similar objects into classes or sets either for convenience, organization , or access , as in a collection ,a library , or a computer data base , or for the purpose of learning more about the items being classified . The study of ore deposits through the last century has required and ...

As an example of early classification of hydrothermal ore deposits, here is enclosed Lindgren's (Evans, 1993) classification based on approximate t empe ra t ure s of f orm at ion : Hypot her mal (300- 600 EC ), mes o t h er mal (200- 300 EC ), ep i t h er mal (50-200EC), …

Types of ore; There are two distinct types of copper deposits: sulfide ore and oxide ore. Currently, the most common source of copper ore is the sulfide ore mineral chalcopyrite, which accounts ...

The “ore group” iron ore textural classification scheme (Table 2.7 and Figures 2.7 and 2.8) has been developed to link ore texture to downstream processing performance including lump/fines ratio, beneficiation, blast furnace lump physical and metallurgical properties, or fine ore sintering quality (Clout, 2002). The Ore Group scheme defines ...

Hydraulic classification definition is - the sorting of small particles (as of ground ore) by allowing them to settle against rising currents of fresh water of different velocities.

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Jul 16, 2015· Cite this chapter as: Arndt N., Kesler S., Ganino C. (2015) Classification, Distribution and Uses of Ores and Ore Deposits. In: Metals and Society.

In another common method of classification, ore minerals are divided into hypogene (also termed primary) deposits and supergene (also known as secondary) deposits. The secondary deposits are formed as alteration products of primary deposits through weathering and related processes. An ore deposit may be either of igneous or of sedimentary origin.

Here, then, is the classification: Porphyry Large, low grade deposits usually associated with a porphyritic intrusive body. A. Cu-Mo B. Cu (-Au) C. Mo (-W) Skarn Mineral deposits formed by replacement of limestone by ore and calc-silicateminerals, usually adjacent to a felsic or granitic intrusive body. A. W-Cu ( …

Classification of refractory ores. 1. Carbonaceous gold ore. There is organic carbon which can do‘Rob gold’in gold and silver ore, and it causes that gold is adsorbed in the cyanide solution ...