2 edition of Diamond-bearing alluvial gravels of the Union of South Africa. found in the catalog.
Diamond-bearing alluvial gravels of the Union of South Africa.
Alpheus F. Williams
|The Physical Object|
|Number of Pages||169|
Transvaal, an inland province of the Union of South Africa between the Vaal and Limpopo rivers. It lies, roughly, between 22½° and 27½° S. and 25° and 32° E., and is bounded S. by the Orange Free State and Natal, W. by the Cape province and the Bechuanaland Protectorate, N. by Rhodesia, E. by Portuguese East Africa and Swaziland. South Africa Geopolitical South Africa has a long legacy as a diamond producer extending back over a century to the early days of the founding of De Beers in Kimberley. However, in recent years the apparent complexity of doing business in the country combined with a perception that it is the exclusive domain of majors has resulted in mineral.
TRANSVAAL, an inland province of the Union of South Africa between the Vaal and Limpopo rivers. It lies, roughly, between /2 and /2 S. and 25 and 32 E., and is bounded S. by the Orange Free State and Natal, W. by the Cape province and the Bechuanaland Protectorate, N. by Rhodesia, E. by Portuguese East Africa and Swaziland. Full text of "Transactions of the South African Philosophical Society" See other formats.
This discovery was followed by further finds of both diamond-bearing kimberlite pipes and alluvial deposits in the drainage system of the Vaal River. The first discoveries on the west coast of southern Africa only occurred 42 years later, however, when a railway construction worker, Zacharia Lewala, found the first diamond near Lüderitz in In southeastern Wyoming, thick Proterozoic (Author: The Gem Hunter.
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Discoveries of even larger alluvial deposits in south- western Africa (Namibia and Angola), central Africa (Zaire and the Central African Republic), west Africa (Ghana, Sierra Leone, Guinea and Liberia) and east Africa (Tanzania) resulted in Africa's domination of world diamond production for most of the 20th by: The Alluvial Diamondiferous Deposits of South and Southwest Africa, F.C.
Cornell, Journal of the Royal Society of Arts, Vol. 69, No.pp.(). The author, who had spent nearly a decade studying the diamond deposits in both countries, describes the history of diamond mining and how diamonds are recovered along the coast. Another major paper by him, "Diamond-bearing alluvial gravels of the union of South Africa", was published in the British Empire Mining and Metallurgical Congress Handbook (Johannesburg,pp.
Probably his most important work was a book, The genesis of the diamond. BOOK REVIEW THE GENESIS OF THE DIAMOND. Arpnnus F. 2 Vols., XV+ and of the various characteristics of that important diamond bearing rock.
What diamond itself, and to the occurrences of the gem in the alluvial gravels of the Union of South Africa. Request PDF | On Jul 3,Bruce Cairncross and others published Who's Who in Mineral Names: Alpheus Fuller Williams (–) | Find, read and cite all the research you need on ResearchGateAuthor: Bruce Cairncross.
With the discovery of diamond-bearing kimberlites in South Africa inBrazil lost its standing as the world’s primary source. Its total production, an estimated 45 million carats over three centuries, is alluvial in nature and has mostly been recovered through the work of garimpeiros (K.
Johnson, pers. comm., ). Alpheus F. Williams has written: 'The genesis of the diamond' 'Diamond-bearing alluvial gravels of the Union of South Africa' Asked in South Africa Is south Africa a developing region even after.
South Africa continues producing diamonds from alluvial deposits and pipes within the country. Diamond mining also takes place along the coastline of the country. For millions of years, erosion removed diamonds from inland locations, and rivers have brought them to the coast and dropped them along with the shoreline sediments.
Diamond-bearing gravels of the Lichtenburg—Ventersdorp area of the North West Province are associated with sinuous North–South orientated ‘runs’ that occur exclusively on a flat erosional. Alluvial Mining As the elements erode diamond-bearing pipes, the stones are liberated from the kimberlite and transported over long distances.
Alluvial gravels, extending from the Lichtenburg to Barkly West districts along the Orange and Vaal Rivers and on the Northern and Western Cape coasts, yield diamonds commonly of a better quality than. A high percentage of these are of gem and near-gem quality.
Diamonds occur in pipes and fissures of kimberlite, as well as in alluvial and marine deposits. The well-known Premier Pipe, at Cullinan in Gauteng, the largest in South Africa, covers an area of 54 hectare. De Beers and TransHex are South Africa’s two largest producers of diamonds.
Stratten, T., The origin of the diamondiferous alluvial gravels in the southwestern Transvaal. In: A.M. Anderson and W.J. von Biljon (editors), Some sedimentary basins and associated ore deposits of South Africa.
Special Publication of the Geological Society of Cited by: 2. Two Commercial Diamond Mines. Two locations in the United States have been worked as commercial diamond mines. The first was a mine near Murfreesboro, was worked as a commercial diamond mine by a succession of operators in the early s but closed because the deposit was subeconomic.
Today it is known as the "Crater of Diamonds" and is operated by the State of Arkansas. Full text of "South-west Africa during the German occupation, " See other formats. This diamond became known as the “Star of South Africa” and sparked a major rush of European and American prospectors to South Africa.
Later in diamonds were discovered in gravels along the Vaal River near the current town of Barkly West (Wagner, ). A large number of “diggers” began exploiting these gravels for diamonds and Cited by: For the last hundred million years, the Orange has been carrying eroded diamondiferous kimberlite material from its source on the Kaapvaal Craton, in central South Africa and Botswana.
Diamond-bearing material was deposited in river bank gravels and alluvium as it traveled westward towards the Atlantic Ocean. Even so, diamonds were found in and in alluvial gravels near the confluence of the Vaal and Orange Rivers not far from the present site Kimberley, South Africa.
This discovery led to the "wet diggings" diamond rush in Africa, but the source of the diamonds remained : The Gem Hunter. Only inafter alluvial stones in gravels of the Orange and V aal river systems in South Africa led to the discovery of diamonds in so-called ‘dry diggings’ at Jagersfontein and Kimberley, was it realized that alluvial diamonds are secondary deposits derived from an ultramafic igneous source rock, later to be named kimberlite after the.
The discovery of the Argyle diamond mine was not a chance, one-off find but the result of systematic scientific regional prospecting for diamonds in the far north of Western Australia (), a geographic region known as the region consists of the stable Kimberley basin of Proterozoic sediments and basaltic volcanics bordered by the King Leopold and Halls Creek tectonic zones ().
Full text of "The diamond mines of South Africa" See other formats. TRANSVAAL, an inland province of the Union of South Africa between the Vaal and Limpopo rivers. It lies, roughly, between 22r and ° S.
and 25° and 32° E., and is bounded S. by the Orange Free State and Natal, W. by the Cape province and the Bechuanaland Protectorate, N.
by Rhodesia, E. by Portuguese East Africa and Swaziland. Of this total, South Africa has contributed million carats, or 18% of all natural diamonds. Today, South Africa ranks fifth in world diamond production by volume, behind Australia, Botswana, Russia and Congo, annually producing approximately 10% of the world’s supply.
By value, only Botswana and Russia exceed South Africa’s contribution.Because of the discovery of diamonds in alluvial gravels of the Abaeté and other rivers in the midth century (Barbosa ), garimpeiros (artisan diggers) migrated towards the West to a region called the Triângulo the 19th century, scientists (e.g.
Derby ; Pires ) described the diamond occurrences and provided the first geological descriptions of the region.