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Montagne D'Or Mine
The Montagne d'Or mine () is one of the largest gold mine projects in French Guiana, an overseas region of France. The mine is located in the north-west of the country in the Arrondissement of Saint-Laurent-du-Maroni. The mine has estimated reserves of of gold. The mine is a continuation of the Paul Isnard mine discovered in 1875. It is considered very controversial, because it is located between the two parts of the Lucifer Dékou-Dékou Biological Reserve, and is sometimes less than 500 metres from the perimeter of the wilderness area. Geography The Paul-Isnard mining concessions, which include the “Montagne d'Or” site, are located in the commune of Saint-Laurent-du-Maroni, in the French overseas department of Guyana. They are located south of the town of Saint-Laurent-du-Maroni, to which they are linked by a 120 km forest track, passing through the Apatou Crossroads. They are located 180 km west of Cayenne. They belong to the basin of the Mana River which has its mouth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arrondissement Of Saint-Laurent-du-Maroni
The arrondissement of Saint-Laurent-du-Maroni is an arrondissement of France in French Guiana department in French Guiana region. It has eight communes. Its population is 100,954 (2022), and its area is . Composition The communes of the arrondissement of Saint-Laurent-du-Maroni, and their INSEE codes, are: # Apatou (97360) # Awala-Yalimapo (97361) # Grand-Santi (97357) # Mana (97306) # Maripasoula (97353) # Papaïchton (97362) # Saint-Laurent-du-Maroni (97311) # Saül (97352) History The arrondissement of Saint-Laurent-du-Maroni was established in 1969. Before 2015, the arrondissements of French Guiana were subdivided into cantons. The cantons of the arrondissement of Saint-Laurent-du-Maroni were, as of January 2015:Populations légales 2012: 973 Guyane [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Syncline
In structural geology, a syncline is a fold with younger layers closer to the center of the structure, whereas an anticline is the inverse of a syncline. A synclinorium (plural synclinoriums or synclinoria) is a large syncline with superimposed smaller folds. Synclines are typically a downward fold (synform), termed a synformal syncline (i.e. a trough), but synclines that point upwards can be found when strata have been overturned and folded (an antiformal syncline). Characteristics On a geologic map, synclines are recognized as a sequence of rock layers, with the youngest at the fold's center or ''hinge'' and with a reverse sequence of the same rock layers on the opposite side of the hinge. If the fold pattern is circular or elongate, the structure is a basin. Folds typically form during crustal deformation as the result of compression that accompanies orogenic mountain building. Notable examples * Powder River Basin, Wyoming, US * Sideling Hill roadcut along Interstate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Climate Change
In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its effects on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to Earth's climate. The current rise in global average temperature is more rapid than previous changes, and is primarily caused by humans burning fossil fuels. Fossil fuel use, deforestation, and some agricultural and industrial practices increase greenhouse gases, notably carbon dioxide and methane. Greenhouse gases absorb some of the heat that the Earth radiates after it warms from sunlight. Larger amounts of these gases trap more heat in Earth's lower atmosphere, causing global warming. Due to climate change, deserts are expanding, while heat waves and wildfires are becoming more common. Increased warming in the Arctic has contributed to melting permafrost, glacial retreat and sea ice loss. Higher temperatures are also causing m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Emmanuel Macron
Emmanuel Macron (; born 21 December 1977) is a French politician who has served as President of France since 2017. ''Ex officio'', he is also one of the two Co-Princes of Andorra. Prior to his presidency, Macron served as Minister of Economics, Industry and Digital Affairs under President François Hollande between 2014 and 2016. Born in Amiens, he studied philosophy at Paris Nanterre University, later completing a master's degree in public affairs at Sciences Po and graduating from the École nationale d'administration in 2004. Macron worked as a senior civil servant at the Inspectorate General of Finances and later became an investment banker at Rothschild & Co. Macron was appointed Élysée deputy secretary-general by President François Hollande shortly after his election in May 2012, making him one of Hollande's senior advisers. He was appointed to the Government of Prime Minister Manuel Valls as Minister of Economics, Industry and Digital Affairs in August 2014 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nordgold
Nord Gold S.E., (Nordgold) is a gold mining company with assets in Russia, Kazakhstan, Burkina Faso, Guinea and Canada History Nordgold was established as Severstal Gold, a gold producing subsidiary of Severstal, the Russian steel company owned by Alexey Mordashov. In early 2007, Severstal acquired the Suzdal and Zherek mines in Kazakhstan, as well as the Aprelkovo and Neryungri mines in Russia. In August 2008, Severstal acquired control over the Balazhal mine in Kazakhstan as well as Irokinda, Zun-Holba and Berezitovy mines in Russia and the Taparko and Bissa mines in Burkina Faso. In late 2010 – early 2011, the company acquired control over the Lefa mine in Guinea. In early 2012, Nordgold separated from Severstal and became a publicly listed company via the listing of Global Depositary Receipts on the London Stock Exchange. In January 2013, Nordgold launched the new Bissa mine in Burkina Faso. Nordgold expanded its flagship Bissa mine with the launch of a heap leach operat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Columbus Gold
Columbus is a Latinized version of the Italian surname "''Colombo''". It most commonly refers to: * Christopher Columbus (1451-1506), the Italian explorer * Columbus, Ohio, capital of the U.S. state of Ohio Columbus may also refer to: Places Extraterrestrial * Columbus (crater), a crater on Mars * ''Columbus'' (ISS module), the European module for the International Space Station * ''Columbus'' (spacecraft), a program to develop a European space station 1986–1991 Italy * Columbus (Rome), a residential district United States * Columbus, Arkansas * Columbus, Georgia * Columbus, Illinois * Columbus, Indiana, known for modern architecture * Columbus, Kansas * Columbus, Kentucky * Columbus, Minnesota * Columbus, Mississippi * Columbus, Missouri * Columbus, Montana * Columbus, Nebraska * Columbus, New Jersey * Columbus, New Mexico * Columbus, New York * Columbus, North Carolina * Columbus, North Dakota * Columbus, Ohio, the largest city in United States with this name * Columbus ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sericite
Sericite is the name given to very fine, ragged grains and aggregates of white (colourless) micas, typically made of muscovite, illite, or paragonite. Sericite is produced by the alteration of orthoclase or plagioclase feldspars in areas that have been subjected to hydrothermal alteration typically associated with copper, tin, or other hydrothermal ore deposits. Sericite also occurs as the fine mica that gives the sheen to phyllite and schistose metamorphic rocks. The name comes from Latin ''sericus'', meaning "silken" in reference to the location from which silk was first utilized, which in turn refers to the silky sheen of rocks with abundant sericite. File:Granite pmg ss 2006.jpg, Granite in thin section under cross-polarized light in which feldspar crystals exhibit sericite alteration. File:Staurolite garnet schist 3mm xp 2007.jpg, Staurolite-garnet schist in thin section under cross-polarized light with sericite. References External linksMindat [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlorite
The chlorite ion, or chlorine dioxide anion, is the halite with the chemical formula of . A chlorite (compound) is a compound that contains this group, with chlorine in the oxidation state of +3. Chlorites are also known as salts of chlorous acid. Compounds The free acid, chlorous acid HClO2, is the least stable oxoacid of chlorine and has only been observed as an aqueous solution at low concentrations. Since it cannot be concentrated, it is not a commercial product. The alkali metal and alkaline earth metal compounds are all colorless or pale yellow, with sodium chlorite (NaClO2) being the only commercially important chlorite. Heavy metal chlorites (Ag+, Hg+, Tl+, Pb2+, and also Cu2+ and ) are unstable and decompose explosively with heat or shock. Sodium chlorite is derived indirectly from sodium chlorate, NaClO3. First, the explosively unstable gas chlorine dioxide, ClO2 is produced by reducing sodium chlorate with a suitable reducing agent such as methanol, hydrogen perox ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chalcopyrite
Chalcopyrite ( ) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green-tinged black. On exposure to air, chalcopyrite tarnishes to a variety of oxides, hydroxides, and sulfates. Associated copper minerals include the sulfides bornite (Cu5FeS4), chalcocite (Cu2S), covellite (CuS), digenite (Cu9S5); carbonates such as malachite and azurite, and rarely oxides such as cuprite (Cu2O). Is rarely found in association with native copper. Chalcopyrite is a conductor of electricity. Etymology The name chalcopyrite comes from the Greek words , which means copper, and ', which means striking fire. It was sometimes historically referred to as "yellow copper". Identification Chalcopyrite is often confused with pyrite and gold since all three of these minerals have a yell ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrrhotite
Pyrrhotite is an iron sulfide mineral with the formula Fe(1-x)S (x = 0 to 0.2). It is a nonstoichiometric variant of FeS, the mineral known as troilite. Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic. The magnetism decreases as the iron content increases, and troilite is non-magnetic.Vaughan, D. J.; Craig, J. R. "Mineral Chemistry of Metal Sulfides" Cambridge University Press, Cambridge: 1978. . Structure Pyrrhotite exists as a number of polytypes of hexagonal or monoclinic crystal symmetry; several polytypes often occur within the same specimen. Their structure is based on the NiAs unit cell. As such, Fe occupies an octahedral site and the sulfide centers occupy trigonal prismatic sites. Materials with the NiAs structure often are non-stoichiometric because they lack up to 1/8th fraction of the metal ions, creating vacancies. One of such structures is pyrrhotite-4C (Fe7S8). Here "4" indicates that iron vacancies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pyrite
The mineral pyrite (), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Iron, FeSulfur, S2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. Pyrite's metallic Luster (mineralogy), luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of ''fool's gold''. The color has also led to the nicknames ''brass'', ''brazzle'', and ''Brazil'', primarily used to refer to pyrite found in coal. The name ''pyrite'' is derived from the Greek language, Greek (), 'stone or mineral which strikes fire', in turn from (), 'fire'. In ancient Roman times, this name was applied to several types of stone that would create sparks when struck against steel; Pliny the Elder described one of them as being brassy, almost certainly a reference to what we now call pyrite. By Georgius Agricola's time, , the term had become a generic term for all of the pyrite group, sulfide minerals. Pyrite is usua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Schist
Schist ( ) is a medium-grained metamorphic rock showing pronounced schistosity. This means that the rock is composed of mineral grains easily seen with a low-power hand lens, oriented in such a way that the rock is easily split into thin flakes or plates. This texture (geology), texture reflects a high content of platy minerals, such as micas, talc, chlorite group, chlorite, or graphite. These are often interleaved with more granular minerals, such as feldspar or quartz. Schist typically forms during regional metamorphism accompanying the process of mountain building (orogeny) and usually reflects a medium Metamorphism#Metamorphic grades, grade of metamorphism. Schist can form from many different kinds of rocks, including sedimentary rocks such as mudstones and igneous rocks such as tuffs. Schist metamorphosed from mudstone is particularly common and is often very rich in mica (a ''mica schist''). Where the type of the original rock (the protolith) is discernible, the schist is us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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