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The economy of Guinea is dependent largely on agriculture and other rural activities. Guinea is richly endowed with good minerals, possessing an estimated quarter of the world's proven reserves of bauxite, more than 1.8 billion tonnes of high-grade iron ore, significant diamond and gold deposits, and undetermined quantities of uranium.
The economy of Liberia is extremely underdeveloped, with only $3.222 billion by gross domestic product as of 2019, largely due to the First (1989–1996) and Second Liberian Civil War (1999–2003). Liberia itself is one of the poorest and least developed countries in the world, according to the United Nations.
Mining is the extraction of valuable geological materials from the Earth and other astronomical objects. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining in a wider sense includes extraction of any non-renewable resource such as petroleum, natural gas, or even water.
Banded iron formations are distinctive units of sedimentary rock consisting of alternating layers of iron oxides and iron-poor chert. They can be up to several hundred meters in thickness and extend laterally for several hundred kilometers. Almost all of these formations are of Precambrian age and are thought to record the oxygenation of the Earth's oceans. Some of the Earth's oldest rock formations, which formed about 3,700 million years ago (Ma), are associated with banded iron formations.
Waukon is a city in Makee Township, Allamakee County, Iowa, United States, and the county seat of Allamakee County. The population was 3,827 at the time of the 2020 census.
A gold rush or gold fever is a discovery of gold—sometimes accompanied by other precious metals and rare-earth minerals—that brings an onrush of miners seeking their fortune. Major gold rushes took place in the 19th century in Australia, New Zealand, Brazil, Chile, South Africa, California, the United States, and Canada while smaller gold rushes took place elsewhere.
Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey, bright yellow, or deep purple to rusty red. The iron is usually found in the form of magnetite (Fe
3O
4, 72.4% Fe), hematite (Fe
2O
3, 69.9% Fe), goethite (FeO(OH), 62.9% Fe), limonite (FeO(OH)·n(H2O), 55% Fe) or siderite (FeCO3, 48.2% Fe).
Ilmenite is a titanium-iron oxide mineral with the idealized formula FeTiO
3. It is a weakly magnetic black or steel-gray solid. Ilmenite is the most important ore of titanium and the main source of titanium dioxide, which is used in paints, printing inks, fabrics, plastics, paper, sunscreen, food and cosmetics.
The Mesabi Iron Range is a mining district in northeastern Minnesota following an elongate trend containing large deposits of iron ore. It is the largest of four major iron ranges in the region collectively known as the Iron Range of Minnesota. First described in 1866, it is the chief iron ore mining district in the United States. The district is located largely in Itasca and Saint Louis counties. It has been extensively worked since 1892, and has seen a transition from high-grade direct shipping ores through gravity concentrates to the current industry exclusively producing iron ore (taconite) pellets. Production has been dominantly controlled by vertically integrated steelmakers since 1901, and therefore is dictated largely by US ironmaking capacity and demand.
A bloomery is a type of metallurgical furnace once used widely for smelting iron from its oxides. The bloomery was the earliest form of smelter capable of smelting iron. Bloomeries produce a porous mass of iron and slag called a bloom. The mix of slag and iron in the bloom, termed sponge iron, is usually consolidated and further forged into wrought iron. Blast furnaces, which produce pig iron, have largely superseded bloomeries.
Bambari is a town in the Central African Republic, lying on the Ouaka River. It has a population of 41,356 and is the capital of Ouaka prefecture. Bambari is an important market town and is home to Bambari Airport, and the Roman Catholic Diocese of Bambari.
The Mauritania Railway is the national railway of Mauritania. Construction of the line began in 1960, with it opening in 1963. It consists of a single, 704-kilometre (437 mi) railway line linking the iron mining centre of Zouérat with the port of Nouadhibou, via Fderik and Choum. The state agency Société nationale industrielle et minière (SNIM) controls the railway line.
Iron ore production in Africa is dominated by South Africa, Mauritania and Algeria. Many countries possess iron ore deposits that are as yet untapped/unmined. Countries and companies currently involved in production are listed here; measurements are in tonnes per annum(year).
Ferrous metallurgy is the metallurgy of iron and its alloys. The earliest surviving prehistoric iron artifacts, from the 4th millennium BC in Egypt, were made from meteoritic iron-nickel. It is not known when or where the smelting of iron from ores began, but by the end of the 2nd millennium BC iron was being produced from iron ores in the region from Greece to India, and Sub-Saharan Africa. The use of wrought iron was known by the 1st millennium BC, and its spread defined the Iron Age. During the medieval period, smiths in Europe found a way of producing wrought iron from cast iron using finery forges. All these processes required charcoal as fuel.
The West African Craton (WAC) is one of the five cratons of the Precambrian basement rock of Africa that make up the African Plate, the others being the Kalahari craton, Congo craton, Saharan Metacraton and Tanzania Craton. Cratons themselves are tectonically inactive, but can occur near active margins, with the WAC extending across 14 countries in Western Africa, coming together in the late Precambrian and early Palaeozoic eras to form the African continent. It consists of two Archean centers juxtaposed against multiple Paleoproterozoic domains made of greenstone belts, sedimentary basins, regional granitoid-tonalite-trondhjemite-granodiorite (TTG) plutons, and large shear zones. The craton is overlain by Neoproterozoic and younger sedimentary basins. The boundaries of the WAC are predominantly defined by a combination of geophysics and surface geology, with additional constraints by the geochemistry of the region. At one time, volcanic action around the rim of the craton may have contributed to a major global warming event.
The Man Shield is a geological shield or craton in the southeast portion of the West African Craton. The shield is in part overlaid by gold-bearing Birimian formations.
Aboso is a town near Tarkwa, and is the capital of Wassa West district, a district in the Western Region of Ghana. Aboso is the 78th most populous settlement in Ghana, with a population of 9,945 people. At the Ghana census of 18 March 1984, there were 4,700 inhabitants living in the town.
The mining industry of Guinea was developed during colonial rule. The minerals extracted consisted of iron, gold, diamond, and bauxite. Guinea ranks first in the world in bauxite reserves and 6th in the extraction of high-grade bauxite, the aluminium ore. The mining industry and exports of mining products accounted for 17% of Guinea's gross domestic product (GDP) in 2010. Mining accounts for over 50% of its exports. The country accounts for 94% of Africa's mining production of bauxite. The large mineral reserve, which has mostly remained untapped, is of immense interest for international firms.
The mining industry of Liberia has witnessed a revival after the civil war which ended in 2003. Gold, diamonds, and iron ore form the core minerals of the mining sector with a new Mineral Development Policy and Mining Code being put in place to attract foreign investments. In 2013, the mineral sector accounted for 11% of GDP in the country and the World Bank projected a further increase in the sector by 2017.
Ghana was initially referred to as the Gold Coast. After attaining independence, the country's first sovereign government named the state after the Ghana Empire in modern Mauritania and Mali. Gold Coast was initially inhabited by different states, empires and ethnic groups before its colonization by the British Empire. The earliest known physical remains of the earliest man in Ghana were first discovered by archaeologists in a rock shelter at Kintampo during the 1960s. The remains were dated to be 5000 years old and it marked the period of transition to sedentism in Ghana. Early Ghanaians used Acheulean stone tools as hunter gatherers during the Early stone age. These stone tools evolved throughout the Middle and Late Stone Ages, during which some early Ghanaians inhabited caves.
References
- ↑ Dickson, K. B. (1969). A Historical Geography of Ghana. Cambridge U.P. p. 91. ISBN 9780521071024 . Retrieved 2015-05-17.
- ↑ "FACTBOX: African iron ore projects". reuters.com. Reuters. Retrieved 2015-05-17.
- ↑ The Report: Ghana 2012. Oxford Business Group. 2012. p. 116. ISBN 9781907065644.
Coordinates: 10°56′11″N01°31′20″W / 10.93639°N 1.52222°W