|
Gold Mine
Gold mining is the extraction of gold by mining. Historically, mining gold from alluvial deposits used manual separation processes, such as gold panning. The expansion of gold mining to ores that are not on the surface has led to more complex extraction processes such as pit mining and gold cyanidation. In the 20th and 21st centuries, most volume of mining was done by large corporations. However, the value of gold has led to millions of small, artisanal miners in many parts of the Global South. Like all mining, human rights and environmental issues are common in the gold mining industry, and can result in environmental conflict. In mines with less regulation, health and safety risks are much higher. History The exact date that humans first began to mine gold is unknown, but some of the oldest known gold artifacts were found in the Varna Necropolis in Bulgaria. The graves of the necropolis were built between 4700 and 4200 BC, indicating that gold mining could be at leas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold
Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal, a group 11 element, and one of the noble metals. It is one of the least reactivity (chemistry), reactive chemical elements, being the second-lowest in the reactivity series. It is solid under standard temperature and pressure, standard conditions. Gold often occurs in free elemental (native state (metallurgy), native state), as gold nugget, nuggets or grains, in rock (geology), rocks, vein (geology), veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as in electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides). Gold is resistant to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kalgoorlie The Big Pit DSC04498
Kalgoorlie-Boulder (or just Kalgoorlie) is a city in the Goldfields–Esperance region of Western Australia, located east-northeast of Perth at the end of the Great Eastern Highway. It is referred to as Kalgoorlie–Boulder as the surrounding urban area includes the historic townsite of Boulder and the local government area is the City of Kalgoorlie–Boulder. Kalgoorlie–Boulder lies on the traditional lands of the Wangkatja group of peoples. The name "Kalgoorlie" is derived from the Wangai word ''Karlkurla'' or ''Kulgooluh'', meaning "place of the silky pears". The city was established in 1893 during the Western Australian gold rushes. It soon replaced Coolgardie as the largest settlement on the Eastern Goldfields. Kalgoorlie is the ultimate destination of the Goldfields Water Supply Scheme and the Golden Pipeline Heritage Trail. The nearby Super Pit gold mine was Australia's largest open-cut gold mine for many years. During August 2021, Kalgoorlie–Boulder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sakdrisi
Sakdrisi ( ka, საყდრისი), also known as the Sakdrisi-Kachagiani site (საყდრისი-ყაჩაღიანი), is a gold mine and an archaeological site, containing a prehistoric mine, in Georgia, in the south of the country's Kvemo Kartli region, located between the Neolithic site of Arukhlo and the Paleolithic site of Dmanisi. From 2004 to 2011, a group of Georgian and German scientists carried out large-scale investigations and dated the site to the early 3rd millennium BC or to the second half of the 4th millennium, suggesting that Sakdrisi might be one of the world's oldest known gold mines. In 2013, the government of Georgia deprived the site of a cultural monument status, which had been conferred on it in 2006, and gave permission to the mining company RMG to extract gold in the wider area where Sakdrisi is located, sparking protests from academics and preservationists. RMG launched its works until December 2014, leading to more protests fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Kingdom Of Egypt
The New Kingdom, also called the Egyptian Empire, refers to ancient Egypt between the 16th century BC and the 11th century BC. This period of History of ancient Egypt, ancient Egyptian history covers the Eighteenth Dynasty of Egypt, Eighteenth, Nineteenth Dynasty of Egypt, Nineteenth, and Twentieth Dynasty of Egypt, Twentieth dynasties. Through radiocarbon dating, the establishment of the New Kingdom has been placed between 1570 and 1544 BC. The New Kingdom followed the Second Intermediate Period of Egypt, Second Intermediate Period and was succeeded by the Third Intermediate Period of Egypt, Third Intermediate Period. It was the most prosperous time for the Egyptians#History, Egyptian people and marked the peak of Egypt's power. In 1845, the concept of a "New Kingdom" as Periodization of ancient Egypt, one of three "golden ages" was coined by German scholar Christian Charles Josias von Bunsen; the original definition would evolve significantly throughout the 19th and 20th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Middle Kingdom Of Egypt
The Middle Kingdom of Egypt (also known as The Period of Reunification) is the period in the history of ancient Egypt following a period of political division known as the First Intermediate Period of Egypt, First Intermediate Period. The Middle Kingdom lasted from approximately 2040 to 1782 BC, stretching from the reunification of Egypt under the reign of Mentuhotep II in the Eleventh Dynasty of Egypt, Eleventh Dynasty to the end of the Twelfth Dynasty of Egypt, Twelfth Dynasty. The kings of the Eleventh Dynasty ruled from Thebes, Egypt, Thebes and the kings of the Twelfth Dynasty ruled from Lisht, el-Lisht. The Periodization of ancient Egypt, concept of the Middle Kingdom as one of three golden ages was coined in 1845 by German Egyptologist Christian Charles Josias von Bunsen, Baron von Bunsen, and its definition evolved significantly throughout the 19th and 20th centuries. Some scholars also include the Thirteenth Dynasty of Egypt wholly into this period, in which case the Mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Old Kingdom Of Egypt
In ancient Egyptian history, the Old Kingdom is the period spanning –2200 BC. It is also known as the "Age of the Pyramids" or the "Age of the Pyramid Builders", as it encompasses the reigns of the great pyramid-builders of the Fourth Dynasty of Egypt, Fourth Dynasty, such as King Sneferu, under whom the art of pyramid-building was perfected, and the kings Khufu, Khafre and Menkaure, who commissioned the construction of the Giza pyramid complex, pyramids at Giza. Ancient Egypt, Egypt attained its first sustained peak of civilization during the Old Kingdom, the first of three so-called "Kingdom" Egyptian chronology, periods (followed by the Middle Kingdom of Egypt, Middle Kingdom and New Kingdom of Egypt, New Kingdom), which mark the high points of civilization in the lower Nile Valley. The Periodization of Ancient Egypt, concept of an "Old Kingdom" as one of three "golden ages" was coined in 1845 by the German Egyptology, Egyptologist Christian Charles Josias von Bunsen, Baron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extractive Metallurgy
Extractive metallurgy is a branch of metallurgical engineering wherein process and methods of extraction of metals from their natural mineral deposits are studied. The field is a materials science, covering all aspects of the types of ore, washing, concentration, separation, chemical processes and extraction of pure metal and their alloying to suit various applications, sometimes for direct use as a finished product, but more often in a form that requires further working to achieve the given properties to suit the applications. The field of ferrous and non-ferrous extractive metallurgy have specialties that are generically grouped into the categories of mineral processing, hydrometallurgy, pyrometallurgy, and electrometallurgy based on the process adopted to extract the metal. Several processes are used for extraction of the same metal depending on occurrence and chemical requirements. Mineral processing Mineral processing begins with beneficiation, consisting of ini ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mallet
A mallet is a tool used for imparting force on another object, often made of rubber or sometimes wood, that is smaller than a maul or beetle, and usually has a relatively large head. General overview The term is descriptive of the overall size and proportions of the tool, and not the materials it may be made of, though most mallets have striking faces that are softer than steel. Mallets are used in various industries, such as upholstery work, and a variety of other general purposes. It is a tool of preference for wood workers using chisels with plastic, metal, or wooden handles, as they give a softened strike with a positive drive. * Wooden mallets are usually used in carpentry to knock wooden pieces together, or to drive dowels, chisels and to apply pressure on joints. A wooden mallet will not deform the striking end of a metal tool, as most metal hammers would. It is also used to reduce the force driving the cutting edge of a chisel, giving better control. Hardwo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eastern Desert
The Eastern Desert (known archaically as Arabia or the Arabian Desert) is the part of the Sahara Desert that is located east of the Nile River. It spans of northeastern Africa and is bordered by the Gulf of Suez and the Red Sea to the east, and the Nile River to the west. It extends through Egypt, Eritrea, Ethiopia, and the Sudan. The Eastern Desert consists of a mountain range which runs parallel to the coast (known as the Red Sea Hills), wide sedimentary plateaus extending from either side of the mountains and the Red Sea coast. The rainfall, climate, vegetation and animal life sustained in the desert varies between these different regions. The Eastern Desert has been a mining site for building materials, as well as precious and semi-precious metals, throughout history. It has historically contained many trade routes leading to and from the Red Sea, including the Suez Canal. Geography Historical formation Between 100 and 35 million years ago the area that is now the Eas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bronze Age
The Bronze Age () was a historical period characterised principally by the use of bronze tools and the development of complex urban societies, as well as the adoption of writing in some areas. The Bronze Age is the middle principal period of the three-age system, following the Stone Age and preceding the Iron Age. Conceived as a global era, the Bronze Age follows the Neolithic, with a transition period between the two known as the Chalcolithic. The final decades of the Bronze Age in the Mediterranean basin are often characterised as a period of widespread societal collapse known as the Late Bronze Age collapse (), although its severity and scope are debated among scholars. An ancient civilisation is deemed to be part of the Bronze Age if it either produced bronze by smelting its own copper and alloying it with tin, arsenic, or other metals, or traded other items for bronze from producing areas elsewhere. Bronze Age cultures were the first to History of writing, develop writin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Egypt
Prehistoric Egypt and Predynastic Egypt was the period of time starting at the first human settlement and ending at the First Dynasty of Egypt around 3100 BC. At the end of prehistory, "Predynastic Egypt" is traditionally defined as the period from the final part of the Neolithic period beginning c. 6210 BC to the end of the Naqada III period c. 3000 BC. The dates of the Predynastic period were first defined before widespread archaeological excavation of Egypt took place, and recent finds indicating a very gradual Predynastic development have led to controversy over when exactly the Predynastic period ended. Thus, various terms such as "Protodynastic Period of Egypt, Protodynastic period", "Zero Dynasty" or "Dynasty 0" are used to name the part of the period which might be characterized as Predynastic by some and Early Dynastic by others. The Predynastic period is generally divided into cultural eras, each named after the place where a certain type of Egyptian settlement was fir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neolithic
The Neolithic or New Stone Age (from Ancient Greek, Greek 'new' and 'stone') is an archaeological period, the final division of the Stone Age in Mesopotamia, Asia, Europe and Africa (c. 10,000 BCE to c. 2,000 BCE). It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts of the world. This "Neolithic package" included the History of agriculture, introduction of farming, domestication of animals, and change from a hunter-gatherer lifestyle to one of sedentism, settlement. The term 'Neolithic' was coined by John Lubbock, 1st Baron Avebury, Sir John Lubbock in 1865 as a refinement of the three-age system. The Neolithic began about 12,000 years ago, when farming appeared in the Epipalaeolithic Near East and Mesopotamia, and later in other parts of the world. It lasted in the Near East until the transitional period of the Chalcolithic (Copper Age) from about 6,500 years ago (4500 BCE), marked by the development ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
