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Gerhardminnebron
Gerhardminnebron is a natural karst spring located a few kilometers east of Ventersdorp in South Africa and draining into the Wonderfonteinspruit and Mooi River, which in turn flows into the Vaal River. It yields some 60 000 – 80 000 cubic meters of water per day, and is affected by exploitation and pollution by the gold mining industry in the region, deep–level gold mining having markedly impacted on the dolomitic aquifers. This spring is located in dolomitic rock that is part of the larger Boskop–Turffontein dolomite compartment in the Transvaal Basin. Dolomite is a sedimentary carbonate rock, a swath of which runs parallel to the Magaliesberg, and has a tendency to form large underground lakes and reservoirs. Potchefstroom is one of the largest towns in the area and was established in 1838. Water from the spring is used for the domestic needs of Potchefstroom, and is also utilised by local farmers. The farm on which the spring is located was known to the Voortrekkers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
First Boer War
The First Boer War ( af, Eerste Vryheidsoorlog, literally "First Freedom War"), 1880–1881, also known as the First Anglo–Boer War, the Transvaal War or the Transvaal Rebellion, was fought from 16 December 1880 until 23 March 1881 between the United Kingdom and Boers of the Transvaal (as the South African Republic was known while under British administration). The war resulted in a Boer victory and eventual independence of the South African Republic. Background In the 19th century a series of events occurred in the southern part of the African continent, with the British from time to time attempting to set up a single unified state there, while at other times wanting to control less territory. Three prime factors fuelled British expansion into Southern Africa: * the desire to control the trade routes to India that passed around the Cape of Good Hope * the discovery in 1868 of huge mineral deposits of diamonds around Kimberley on the joint borders of the South African R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karst Spring
A karst spring or karstic spring is a spring (outflow of groundwater) that is part of a karst hydrological system. Description Because of their often conical or inverted bowl shape, karst springs are also known in German-speaking lands as a ''Topf'' ("pot") which is reflected in names such as Aachtopf (the source of the Radolfzeller Aach) or Blautopf (the source of the Blau river in Blaubeuren). Karst springs often have a very high yield or discharge rate, because they are often fed by underground drainage from a large catchment basin. Because the springs are usually the terminus of a cave drainage system at the place where a river cave reaches the Earth's surface, it is often possible to enter the caves from karst springs for exploration. Large karst springs are located in many parts of the world; the largest ones are believed to be in Papua New Guinea, with others located in Mediterranean countries such as Bosnia and Herzegovina, Croatia, Turkey, Slovenia, and Italy. Types ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ventersdorp
Ventersdorp is a town of 4,200 in Dr Kenneth Kaunda District Municipality, North West Province, South Africa. It was the seat of the defunct Ventersdorp Local Municipality until 2016. Ventersdorp is centrally located, making it easier to access more prominent urban towns such as Klerksdorp, Lichtenburg, Potchefstroom and Rustenburg. The township (or ''Location'') of Tshing houses most of the town's blacks and coloureds. Tshing has a diamond mine nearby that was owned by a town councillor in the early 1990s. Tshing Location has one high school: Thuto Boswa High School. The smaller township Toevlug has Coloured residents, some of whom have attend the former whites-only Afrikaans High School after the end of Apartheid since 1995. History The town grew around a Dutch Reformed Church that was established in 1866. It was named after Johannes Venter who owned the farm ''Roodepoort'' and the land the church was built on. It was proclaimed as a town in June 1887. The Mill on the town was b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Africa
South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countries of Namibia, Botswana, and Zimbabwe; and to the east and northeast by Mozambique and Eswatini. It also completely enclaves the country Lesotho. It is the southernmost country on the mainland of the Old World, and the second-most populous country located entirely south of the equator, after Tanzania. South Africa is a biodiversity hotspot, with unique biomes, plant and animal life. With over 60 million people, the country is the world's 24th-most populous nation and covers an area of . South Africa has three capital cities, with the executive, judicial and legislative branches of government based in Pretoria, Bloemfontein, and Cape Town respectively. The largest city is Johannesburg. About 80% of the population are Black South Afri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mooi River (Vaal)
The Mooi River ( af, Mooirivier) is a river in North West Province, South Africa. It is a tributary of the Vaal River and belongs to the Upper Vaal Water Management Area. Course The Mooi rises near Koster and flows southwards. During its course it flows into the Klerkskraal Dam, Boskop Dam and the Potchefstroom Dam. After crossing the town of Potchefstroom it bends southwestwards, shortly bending westwards before it empties into the Vaal River near the border with the Free State, about 15 km east of Stilfontein. Its main tributaries are the Wonderfonteinspruit (Mooirivierloop) and the Loop Spruit. The waters of the Mooi River and its reservoirs are polluted with heavy metals in its mid and lower course because of the large gold and uranium mining operations in the basin. History In November 1838 Voortrekker leader Andries Hendrik Potgieter and his followers established the first permanent European settlement north of the Vaal by the banks of the Mooi River, founding th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vaal River
The Vaal River ( ; Khoemana: ) is the largest tributary of the Orange River in South Africa. The river has its source near Breyten in Mpumalanga province, east of Johannesburg and about north of Ermelo and only about from the Indian Ocean. It then flows westwards to its conjunction with the Orange River southwest of Kimberley in the Northern Cape. It is long, and forms the border between Mpumalanga, Gauteng and North West Province on its north bank, and the Free State on its south. It is the third largest river in South Africa after the Orange River (2200 km long) and the Limpopo River (1750 km long) and was established as the main source of water for the great Witswatersrand area after the gold rush during the 19th century. The Vaal Dam lies on the Vaal River in Deneysville just south of the border between Gauteng and the Free State. It is also important to note that the Vaal River is the longest river wholly within the borders of South Africa. ''Vaal'' is a D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gold Mining Industry
Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in a pure form. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native state), as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as 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 most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dolomitic
Dolomite () is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite. An alternative name sometimes used for the dolomitic rock type is dolostone. History As stated by Nicolas-Théodore de Saussure the mineral dolomite was probably first described by Carl Linnaeus in 1768. In 1791, it was described as a rock by the French naturalist and geologist Déodat Gratet de Dolomieu (1750–1801), first in buildings of the old city of Rome, and later as samples collected in the mountains now known as the Dolomite Alps of northern Italy. Nicolas-Théodore de Saussure first named the mineral (after Dolomieu) in March 1792. Properties The mineral dolomite crystallizes in the trigonal-rhombohedral system. It forms white, tan, gray, or pink crystals. Dolomite is a double carbonate, having an alternating structural arrangement of calcium and magnesium ions. Unless it ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transvaal Basin
The Transvaal Basin is one of three basins of the Transvaal Supergroup on the Kaapvaal craton. The evolution of this 2.65–2.05 Ga Neoarchaean–Palaeoproterozoic basin is thought to have been derived largely from magmatism, palaeoclimate and eustasy, while plate tectonics played an intermittent role. The supergroup is made up of basal ‘ protobasinal’ rocks, upon which followed the Black Reef Formation, Chuniespoort Group and the uppermost Pretoria Group. The Transvaal Supergroup displays three unconformity-bounded sequences that surface in two geographically distinct areas – the Transvaal Basin, which circumscribes the Bushveld Igneous Complex, and the Griqualand West basin, lying between Kimberley and Sishen at the western Kaapvaal craton rim, extending into southern Botswana beneath the Kalahari Sands as the Kanye Basin. The two basins are separated by the broad Vryburg Arch. Between approximately 2.640 and 2.516 Ga, two successive stromatolitic carbonate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magaliesberg
The Magaliesberg (historically also known as ''Macalisberg'' or ''Cashan Mountains'') of northern South Africa, is a modest but well-defined mountain range composed mainly of quartzites. It rises at a point south of the Pilanesberg (and the Pilanesberg National Park) to form a curved prominence that intersects suburban Pretoria before it peters out some to the east, just south of Bronkhorstspruit. The highest point of the Magaliesberg is reached at Nooitgedacht Glacial Pavements, Nooitgedacht, about above sea level. A Hartbeespoort Aerial Cableway, cableway reaching to the top of the mountain range is located at Hartbeespoort Dam, providing sweeping views of the Magaliesberg and surrounding area. Geology The Magaliesberg has ancient origins. Its composition is ascribed to successive Geology, geological processes over a very protracted history. Its quartzites, shales, chert and Dolomite (rock), dolomite were deposited as sediments in an inland basin on top of a 3 billion year o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potchefstroom
Potchefstroom (, colloquially known as Potch) is an academic city in the North West Province of South Africa. It hosts the Potchefstroom Campus of the North-West University. Potchefstroom is on the Mooi Rivier (Afrikaans for "pretty river"), roughly west-southwest of Johannesburg and east-northeast of Klerksdorp. Etymology Several theories exist about the origin of the city's name. According to one theory, it originates from ''Potgieter'' + ''Chef'' + ''stroom'' (referring to Voortrekker leader and town founder Andries Potgieter; "chef" indicates the leader of the Voortrekkers, and "stroom" refers to the Mooi River). Geoffrey Jenkins writes, "Others however, attribute the name as having come from the word 'Potscherf', meaning a shard of a broken pot, due to the cracks that appear in the soil of the Mooi River Valley during drought resembling a broken pot". M. L. Fick suggests that Potchefstroom developed from the abbreviation of "Potgieterstroom" to "Potgerstroom", whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
