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Exit Hymn

- Lumko Church Choir, Composer Not Specified, Dargie, Dave

Ezontombi = Those girls

- Performer not specified, Composer not specified, Dargie, Dave

Freedom and form in the fiction of Doris Lessing

- Flischman, Rita

  • Authors: Flischman, Rita
  • Date: 1981
  • Subjects: Lessing, Doris May, 1919- -- Criticism and interpretation
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2269 , http://hdl.handle.net/10962/d1005921 , Lessing, Doris May, 1919- -- Criticism and interpretation
  • Description: From Introduction: This thesis then is a detailed study of Lessing's novels in an attempt to show her development as a writer. Her short stories are handled briefly in connection with her novels. For, although the short stories are among her finest work, focus on the novels is sufficient to show her growth as a writer. Hers is the small individual struggle to overcome the limitations of both her content and her form. To overcome the limitations of her content means expanding her own consciousness and re-forming life itself. Only when she is free and the world is free can she overcome the limitations of her content. Then, of course, she need no longer and can no longer write. The task seems as impossible as that of the dung beetles, but she nevertheless continues. Like the sacred beetles with "the sun between their feet" she carries on rolling the muck of the world into symbols of the truth.
  • Full Text:
  • Date Issued: 1981

Geodynamics, rifting, stratiform and stratabound mineral deposits

- Dingemans, D.R.W.

  • Authors: Dingemans, D.R.W.
  • Date: 1981 , 2013-03-19
  • Subjects: Ore deposits , Geodynamics , Mines and mineral resources , Rifts (Geology)
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5012 , http://hdl.handle.net/10962/d1006107 , Ore deposits , Geodynamics , Mines and mineral resources , Rifts (Geology)
  • Description: Stratiform and stratabound ore deposits commonly show a direct relationship with rifts. This association is studied by developing a geodynamic model of mantle processes and crustal responses. The geodynamics of the earth can be modelled by the process of mantle advection, which involves the episodic generation and segregation of low density mantle diapirs and their rise and subsequent interaction with the crust. The theory of mantle advection explains the genetic association between rifting, magmatism, basin development and subsequent orogeny and metamorphism. Global evolution has passed through a number of major stages of non-uniformitarian development in which each cycle was characterized by fairly uniform behaviour terminated by intense geodynamic upheaval. The relationship between geological evolution and mantle advection is examined by reviewing the major characteristics of each of the cycles, which correspond to the Archean, Early Proterozoic, Mid Proterozoic, Late Proterozoic-Palaeo2oic, and Mesozoic - Cainozoic eras. Although mentle advection has controlled crustal processes throughout time, the decrease in the thermal energy of the earth has caused >the major evolutionary changes in response to thickening and a greater rigidity of the sialic crust. Rifts are penetrative taphrogenic faults in the earths crust which act as major conduits for the transfer of magmas, from the mantle and lower crustal levels, to the upper crust and the surface. Rifts are also permeable zones for the migration of metalliferous brines, generated by magmatic differentiation. These metalliferous brines would either be exhaled at surface to form stratiform volcanogenic and volcanosedimentary ore deposits , or would interact with preferential host horizons to form stratabound ore deposits . The associat ion between rifting and stratiform and stratabound ore deposits is illustrated by examining :he tectonic setting, and st ratigraphic relationships of typical ore deposit types .
  • Full Text:
  • Date Issued: 1981

Geological factors affecting the grade and tonnage of sandstone uranium deposits

- Holliman, K A

  • Authors: Holliman, K A
  • Date: 1981 , 2013-03-19
  • Subjects: Uranium ores , Sandstone , Geology, Economic
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5009 , http://hdl.handle.net/10962/d1005914 , Uranium ores , Sandstone , Geology, Economic
  • Description: The largest known reserves of uranium are found in sandstone deposits, in the form of roll-front, peneconcordant and stacked types. Drilling on spacings of between 50 m and 5 m centres is the current method of attempting to delineate such ore bodies but because of the apparent random distribution of the mineralization there is a large degree of uncertainty in these predictions. Even on drilling grids of 3,5 m centres the uncertainty in predicting the distribution of stringer ore in roll front mineralization is still 100 per cent. (Sandefur & Grant 1980). Because of escalating costs it is becoming increasingly less economically feasible to delineate bodies of this nature in this manner and much more reliance will have to be placed on the geologist's interpretation of ore distribution when calculating ore reserves. The grade and tonnage of a sandstone uranium deposit can only be calculated with some degree of confidence if the processes forming the ore body are fully understood. The aim of this review is to examine the factors governing the formation and geometry of a sandstone body, the mobility and fixation of uranium and to establish criteria which will enable a more confident prediction to be made of the distribution of sand bodies and the distribution of the mineralization within them
  • Full Text:
  • Date Issued: 1981

Geological factors affecting tonnage-grade relationships in orebodies of the Zambian Copperbelt

- McCulloch, Alan B

  • Authors: McCulloch, Alan B
  • Date: 1981
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:21151 , http://hdl.handle.net/10962/6617
  • Description: The occurrence of a major metalliferous province in Zambia and Zaire is a reflection of geological processes operating in a specific environment during a particular period. The size of orebodies, their grade, mineralogy, beneficiation characteristics and therefore the amount of metal produced are all ultimately functions of the geology of the ores. This study is primarily concerned with the effect geology has on tonnage-grade relationships of ore in situ on the Zambian Copperbelt. Five major topics related to ore tonnage and grade are reviewed here: -behaviour of copper and cobalt in surficial environments. -geological setting and gross lithostratigraphic relationships of mineralization. -characteristics of known orebodies. -geological factors affecting mining and beneficiation of ore. -orebody limits and estimation of tonnage and grade. In addition, the historical background to the problems discussed here is briefly described, and some general aspects of the evaluation, mining and beneficiation of Copperbelt ores are considered in relation to metal production.
  • Full Text:
  • Date Issued: 1981

Geological factors that influence the evaluation and exploitation of Canadian copper-zinc massive sulphide-, and Japanese polymetallic (kuroko) deposits

- Venter, D M

  • Authors: Venter, D M
  • Date: 1981
  • Subjects: Sulfides -- Canada , Ore deposits -- Japan
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:4918 , http://hdl.handle.net/10962/d1003812
  • Description: Volcanogenic massive sulphide deposits are important sources of base metals throughout the world. The Canadian Cu-Zn-(Au, Ag) deposits of Archaean age occur in greenstone terrains within the Canadian Shield. These deposits are closely associated with volcanic vents developed along zones of rifting within mobile belts. The vents are manifested by coarse felsic pyroclastics and/or rhyolitic domes. The Japanese Pb-Zn-Cu-Ba(Ag) deposits, generally known as Kuroko deposits, are of Miocene age, and although also associated with volcanic vents, are developed above zones of subduction. Mineralization in volcanogenic deposits is a result of submarine exhalation of metalliferous hydrothermal solutions derived from fractionation of predominantly calc-alkaline magmas. The deposits are characterized by certain geological features that result from the interaction of specific physical and chemical conditions during deposition. Primary features include massive and stringer sulphide bodies, alteration zones, mineralogical and metal zoning, and certain depositional textures and structures. These features are commonly modified by subsequent metamorphism and deformation which impart secondary ore textures and affect metal distribution and shape. The disparity in age between Canadian and Japanese deposits allows the entire spectrum of geological features to be studied; from the completely unaltered to the high deformed and recrystallized. The characteristic geological features are the prime factors which control the metal distribution and concentration, and the size and shape of the deposits, thereby influencing the viability of the respective ore bodies. A knowledge of these factors and the physico-chemical parameters which control them are thus fundamental in the "understanding" of these deposits. They ultimately control the geological interpretations and predictions made during ore body delineation, ore reserve estimation, mining and ore beneficiation.
  • Full Text:
  • Date Issued: 1981

Geology and ore reserve estimation of the Witwatersrand-type gold deposits with specific reference to the Welkom Goldfield

- Ainslie, L C

Girls' Song

- Group of Sikhwankqeni locals, Composer Not Specified, Dargie, Dave

Girls' Song

- Group of Sikhwankqeni locals, Composer Not Specified, Dargie, Dave

Giving our gifts to God

- St George's Church Choir, Composer Not Specified, Dargie, Dave

Gloria

- St George's Church Choir, Composer Not Specified, Dargie, Dave

Gloria

- St Patrick's Church Congregation, Composer not specified, Dargie, Dave

Guhyetw'e gemegurw'e

- Tondoro school children, Tondoro music workshop participants, Kasiona, Theresiana, Dargie, Dave

Hayo ha! yeyo ndagezelwa

- Dumiso, Nosinothi, Qadushe, Nomountain, Composer Not Specified, Dargie, Dave

Hayo Ha! Yeyo ndagezelwa = Oh my! Oh, I've been disrespected

- Performer not specified, Composer not specified, Dargie, Dave

Ho ha haya ho we we ma

- Sikwankqeni Locals, Composer Not Specified, Dargie, Dave

Ho hayi kayi he

- Mamisi, Nokantani, Composer Not Specified, Dargie, Dave

Holo-ndagezelwa

- Group of Sikhwankqeni locals, Composer Not Specified, Dargie, Dave

Holy, Holy

- St George's Church Choir, Composer Not Specified, Dargie, Dave

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