The Relationship between the Structural Orientation and the Gold Mineralisation of Quartz-Sulphide Veins in the Navachab Gold Deposit,Namibia |
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| Institution: | 1. University of the Witwatersrand, School of Geosciences, Private Bag 3, 2050 Wits, Johannesburg, South Africa;2. Rockwater Consulting, 10 Evergreen Lane, Constantia 7806, Cape Town, South Africa;1. CSA Global Pty Ltd, Level 2, 3 Ord Street, West Perth, 6005 Perth, Western Australia, Australia;2. Rosslyn Hill Mining Pty Ltd, Suite 1D, 21 Teddington Road, Burswood, 6100 Perth, Western Australia, Australia;3. John de Laeter Isotope Centre for Isotope Research, Curtin University, Kent St, Bentley, 6102 Perth, Western Australia, Australia;4. The Institute for Geosciences Research, Curtin University, Kent St, Bentley, 6102 Perth, Western Australia, Australia;1. Geological Survey of Western Australia, Mineral House, 100 Plain St, EAST PERTH 6004, Australia;2. Centre for Microscopy Characterisation and Analysis, The University of Western Australia, 35 Stirling Hwy, CRAWLEY, WA 6009, Australia;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China;2. Centre for Exploration Targeting, The University of Western Australia, Crawley, WA 6009, Australia;3. Exploration Team 606 of the Sichuan Metallurgical and Geological Exploration Bureau, Chengdu 611730, China |
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| Abstract: | This study uses a representative dataset of more than 500 vein samples from the Navachab gold deposit containing information on the gold concentration, structural orientation, vein thickness, alteration and host rock type to investigate small scale controls on the grade distribution in the veins in order to obtain a better understanding of the architecture of the Navachab ore bodies. We calculated mean gold concentrations for each vein set in different parts of the mine. We then examine the preferential mineralisation of certain vein sets by setting this grade information into context to other geological parameters such as the structural geology of that particular part of the mine as well as the above mentioned factors structural orientation of the vein, vein thickness, alteration- and host rock type. Our main findings are that vein sets oriented favourably to the stress field and at high angles to the bedding are better mineralised than veins sets oriented at low angles to the bedding. Other factors do not exert a great influence on the gold concentration in the veins. We propose that the gold grade in the veins is influenced by the effectiveness of fluid flow into the veins and by time rates during vein propagation and fluid flow. |
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