20.1 Metal Deposits – Physical Geology
Mining and Mineral Processing. Metal deposits are mined in a variety of different ways depending on their depth, shape, size, and grade. Relatively large deposits that are quite close to the surface and somewhat regular in shape are mined using open-pit mine methods (Figure 20.1). Creating a giant hole in the ground is generally cheaper than making an …
Geo 101 Tarbuck/Lutgens CH. 23 Flashcards | Quizlet
Reserves are already identified deposits from which minerals can be extracted profitably. ... Which of the following minerals does not form as a result of magmatic segregation? Diamond _____ is a high-pressure ultramafic rock, often containing diamonds, that is carried to the surface in tapered volcanic pipes. ...
Value of mineral deposits associated with mafic and …
Magmatic ore deposits associated with ultramafic and mafic magmatism (MODUM) include nickel sulfide deposits that are locally enriched in copper, cobalt, …
A synthesis of magmatic Ni-Cu-(PGE) sulfide deposits in the …
Magmatic Ni-Cu-(PGE) sulfide deposits in the ca. 260-Ma Emeishan large igneous province (LIP) are all hosted in relatively small, mafic-ultramafic intrusions with surface areas usually less than 1 km 2.These deposits are mainly distributed in the Danba, Panzhihua-Xichang (Panxi), Huili, Yuanmou, Midu, Funing and Jinping regions in SW …
Review Quiz
c. Magmatic segregation and mantle convection d. Hydrothermal activity and fluid enrichment of magmas. Stratiform deposits generally result from a combination of: a. Igneous processes and metamorphic processes b. Igneous processes and sedimentary processes ... Mineral deposits are inorganic, and fossil fuels are organic. b. Fossil fuels …
Magmatic Ore Deposits | SpringerLink
3.1 Introduction. A magmatic ore deposit is an accumulation of magmatic minerals. Some of these minerals are extremely rare and almost never encountered in common rocks, an example being alloys of the platinum metals; other minerals, such as magnetite, are common and can be seen in many thin sections. They form an ore …
magmatic-segregation deposit | Encyclopedia
magmatic-segregation deposit Concentration of particular minerals in different parts of a magma chamber during consolidation, by gravity settling, filter pressing, flow, fractional crystallization, liquid immiscibility, or gas transference; for example, the accumulation of heavy minerals such as chromite and magnetite by gravity settling. A ...
Geochemistry of Magmatic Ore Deposits
The low density and viscosity of fluids permit their rapid physical sep-aration from magmatic systems in many examples and allow a clean conceptual separation between …
Magmatic Processes that Lead to Gold-Only Deposits
For this discussion, the key component of a magmatic deposit is that the magma played an essential role in gold-only deposit formation. This presumably would include a form of extreme chemical partitioning of gold. There are five potential phases that might be involved in effective partitioning of gold — silicate melt, sulfide melt, crystallised …
magmatic deposits
CARBONATITE DEPOSITS : Formed as magmatic segregation deposits. It consists of carbonate minerals like dolomite & calcite. Deposits are related to the alkali rock forming processes and …
Magmatic Ni‐Cu and PGE Deposits: Geology, …
Based on the similar geology and geochemistry of the Voisey's Bay deposit, Labrador, and the Eagle deposit, northern Michigan, these authors propose that these …
Magmatic processes | SpringerLink
Examining mineral stability relations as a function of pressure is a continuing enterprise of experimental petrology laboratories. Plumbing Processes We have considered the source regions and the fusion processes responsible for magmatism, yet many mechanical and chemical adventures remain before the magmatic drama is exhausted.
Mineral deposit
Mineral deposit - Magmatic Cumulates: Magmatic segregation is a general term referring to any process by which one or more minerals become locally concentrated (segregated) during the cooling and crystallization of a magma. Rocks formed as a result of …
20.1: Metal Deposits
The total value of these products was about $44 billion in 2017. 20.01: Metal Deposits#fig20.1.1. Canada's mining sector had revenues in the order of $44 billion in 2017 (Figure 20.1.1 20.1. 1 ). The 4 most valuable commodities were gold, coal, copper and potash, with important amounts from iron, nickel, diamonds, sand and gravel aggregates ...
Chromite ore beneficiation: prospects and challenges
A complex mineral containing magnesium, iron, aluminum, and chromium in varying proportions depending upon the deposit. Iron is replaced by magnesium, …
Cumulate | geology | Britannica
Other articles where cumulate is discussed: mineral deposit: Magmatic cumulates: …magmatic segregation are called magmatic cumulates. While a magma may start as a homogeneous liquid, magmatic segregation during crystallization can produce an assemblage of cumulates with widely differing compositions. Extreme segregation can …
Mineral Deposits: Types and Geology | SpringerLink
The type of ore mineral in magmatic deposits is directly linked to the composition of the host rock. For instance, deposits of nickel, chromium, and platinum group elements are founded in mafic-ultramafic hosts. ... little consensus has been reached about the magma chamber processes responsible for chromite segregation and …
Economic geology
6. Mineral Deposit versus Orebody A mineral deposit/ore deposit may be defined as a rock body that contains one or more elements (or minerals) sufficiently above the average crustal abundance to have potential economic value. Mineral deposits can be classified into two broad categories: (a)metallic mineral deposits (e.g., deposits of copper, lead, …
Magmatic ore deposits (Chapter 2)
Summary. Magmatic ore deposits, also known as orthomagmatic ore deposits, are deposits within igneous rocks or along their contacts in which ore minerals crystallised from a melt or were transported in a melt. Ore deposits that form in and around igneous rock units as a result of mineral precipitation from aqueous solutions or hydrothermal ...
Magma evolution and mineralization of the Baixintan magmatic …
Eastern Tianshan is an important nickel ore belt in China, in which large to middle-sized magmatic Ni–Cu sulfide deposits occur spatially in the eastern part. The Baixintan magmatic Ni–Cu sulfide deposit is an important discovery in the western part of Eastern Tianshan, which provides an ideal target to track the evolution of the magmatic …
Mining Geology " Met ore " Part 1, magmatic segregation deposit …
Study with Quizlet and memorize flashcards containing terms like economic geology, mineral resource, mineral deposit and more. ... ore deposits under magmatic segregation deposits. 1. volcanogenic massive sulfides 2. porphyry Cu 3. skarn 4. epithermal 5. carlin 6. orogenic Au 7. Iron oxide-Cu-Au
MAGMATIC DEPOSITS
Magmatic Base Metal Deposits 1.Chromite Deposits 2.Nickel-Copper Deposits 3.Platinum Group Metals PGM Exploration (Prospecting) Guidelines 1.Exploartion for Chromite deposits 2.Exploration for Nickel-copper deposits 3.Exploration for Platinum deposits. Magmatic sulfide deposits fall into two major groups when considered on the …
8.1: Metal Deposits
A magmatic deposit is one in which the metal concentration takes place primarily at the same time as the formation and emplacement of the magma. ... The heavy nickel and copper sulphide minerals are then concentrated further still by gravity segregation (i.e., crystal settling towards the bottom of the magma chamber). ... Mineral …
Geology Ch. 18 Flashcards | Quizlet
Which type of mineral deposit commonly forms during the early stages of continental rifting? Layered igneous complexes. A placer deposit forms when: Minerals are deposited when flowing water slows down. Which determines whether a metallic element becomes concentrated in the liquid fraction during magmatic segregation?
Sulfide segregation mechanism of magmatic Ni
The early segregation at depth is more likely caused by the addition of crustal S, although the δ 34 S values of sulfides (-0.75‰ to 1.15‰) indicate the isotopic signature of mantle sulfur. For comparison, the development of vein-type sulfide mineralization in the Poyi deposit is ascribed to assimilation of S-bearing Archean rocks.
Early magmatic and late magmatic ore deposits
Late Magmatic Deposits. Late magmatic deposits are ore deposits formed by the crystallisation of igneous minerals near the end of the magmatic crystallisation process. They are formed by the consolidation of igneous fractions left over for the crystallisation of the initial formed rocks from the remaining melt. They differ from the early formed ...
Mineral deposit
Mineral deposit - Formation, Geology, Ore: Mineral deposits form because some medium serves as a concentrating and transporting agent for the ore minerals, and some process subsequently causes the transporting agent to precipitate, or deposit, the minerals. Examples of concentrating and transporting agents are groundwater, seawater, and …
Topic 3 ore forming processes and magmatic mineral deposits
Topic 3 ore forming processes and magmatic mineral deposits - Download as a PDF or view online for free ... Injection of material concentrated elsewhere by differentiation Residual liquid segregation; Residual liquid injection; Immiscible liquid segregation; Immiscible-liquid-injection; Early magmatic deposit; Late magmatic …
What minerals form from magmatic segregation?
magmatic-segregation deposit Concentration of particular minerals in different parts of a magma chamber during consolidation, by gravity settling, filter pressing, flow, fractional crystallization, liquid immiscibility, or gas transference; for example, the accumulation of heavy minerals such as chromite and magnetite …. Advertisement.
The mineral system approach applied to magmatic Ni–Cu–PGE sulphide deposits
1. Introduction. Magmatic Ni–Cu–PGE sulphide deposits are formed by the segregation and accumulation of immiscible sulphide liquid from mafic or ultramafic magmas. The mineral system approach considers the origin of these deposits in the framework of lithospheric-scale processes from the time-honoured perspective of source, …