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Overview of Diamond Resources in Africa

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Overview of Diamond Resources in Africa 199 Overview of Diamond Resources in Africa Mike de Wit1, Zi Bhebhe2, Jim Davidson3, Stephen E. Haggerty4, Paul Hundt5, Jurgen Jacob6, Mike Lynn7, Tania R. Marshall8, Charles Skinner9, Karl Smithson10, Johann Stiefenhofer11, Martin Robert12, Anthony Revitt13, Renato (Spaggs) Spaggiari14 and John Ward15 1 University of Pretoria/Tsodilo Resources Ltd. E-mail: [email protected] 2 Arrow Energy (Pty) Ltd. 3 Technical director Petra Diamonds. E-mail: [email protected] 4 Florida International University, Miami FL, USA. E-mail:[email protected] 5 Currently with Rio Tinto Exploration. 6 Namdeb Diamond Corporation (Pty) Ltd. E-mail: [email protected] 7 CEO at Allotropes Diamonds and Executive Director at Newfield Resources. E-mail: [email protected] 8 Consultant - Explorations Unlimited. E-mail: [email protected] 9 De Beers Exploration (Johannesburg) 10 CEO at Stellar Diamonds PLC. E-mail: [email protected] 11 De Beers Group Services (Pty) Ltd 12 Debswana Diamond Company (Pty) Ltd as the Group Geology Specialist. 13 Anthony Revitt Consulting 14 Geological Consultant, Somerset West. E-mail: [email protected] 15 Majimba Geo-Consulting. E-mail: [email protected] DOI: 10.18814/epiiugs/2016/v39i2/95776 From the discovery of diamonds in South Africa in gathered from company reports, press releases, investor presentations, 1866 until the end of 2013, Africa is estimated to have independent resource reports and technical publications. Several summary publications have been very useful in this review such as produced almost 3.2 Bct out of a total global production Janse (2007), Wilson et al. (2007), Field et al. (2008), as well as the of 5.03 Bct, or 63.6% of all diamonds that have ever Kimberley Process website. been mined. In 2013 African countries ranked 2nd All references to mineral resources have been standardised for (Botswana), 3rd (DRC), 6th (Zimbabwe), 7th (Angola), 8th the sake of comparison and estimated densities have been applied to (South Africa), and 9th (Namibia), in terms of carat volumes of mined material with respect to the secondary mines. These st th th may not always be strictly accurate but they serve the purpose of this production and 1 (Botswana), 4 (Namibia), 5 review. th th th (Angola), 6 (South Africa), 7 (Zimbabwe), and 9 The association of diamondiferous kimberlites with “rigid (DRC), in terms of value of the diamonds produced. In cratonic nuclei of respectable antiquity”, was first recognised by 2013 Africa produced 70.6 Mct out of a global total of Kennedy (1964). Subsequently “Clifford’s Rule” was adopted by most diamond explorers (Clifford, 1966). It states that mineralised 130.5 Mct or 54.1%, which was valued at US$ 8.7 billion kimberlites are found exclusively on stable cratons where the representing 61.5% of the global value of US$ 14.1 minimum age of the last thermal event is 2,500 Ma (i.e. Archaean). billion. These were later termed Archons by Janse (1994). The latest interpretation of the distribution of Archaean blocks (de Wit and Introduction Linol, 2015) and the distribution of known kimberlites and related rocks and secondary deposits in Africa, is used throughout this It is difficult to do justice to the vast quantity of diamonds review (Fig. 1). A distinction is made between cratons, being Archaean produced and the variety of diamond resources in Africa, in a single and stabilised before 2.5 Ga and shields that formed and/or article. In order to present the various African deposits logically, a amalgamated in post-Archaean times and within which Archaean Tier structure is used for primary (kimberlite) deposits as follows: blocks are embedded (de Wit and Linol, 2015). Tier-1 (World-class mines); Tier-2 (Large mines); Tier-3 (Medium Globally there are close to 7,000 kimberlites and lamproites known size mines) and Tier-4 (Small mines including dykes). Many of the in the world (de Wit, 2010) with some 3,000 occurring in Africa. Of Tier-4 projects are marginal and have seen only sporadic mining these 7,000 known intrusions, approximately 1,000 contain diamonds activity and only a selection have been listed. A separate section has (De Beers, 2014) and of these, only 67 are, or have been, economically been allocated to the secondary deposits. sustainable diamond mines. Much of the information on these diamond deposits has been Diamond-bearing kimberlites in Africa range in age from Archaean Episodes Vol. 39, no. 2 200 (Mitzic in Gabon; Henning et al., 2003) to Eocene (Mwadui in optimistic prospectors who found little and soon gave up. Further Tanzania; Stiefenhofer et al., 2004), and diamondiferous sediments finds were made along both the Orange and Vaal Rivers between from Archaean (Witwatersrand Group) to Holocene (inland alluvium 1867 and 1869, but it was the 83.5 ct diamond, the Star of South in various countries and recent marine deposits along the west coast Africa, found in 1869 on the farm Zandfontein close to De Kalk, that of southern Africa). really sparked the first rush by prospectors to these new diamond fields. Diamonds were subsequently discovered along the Vaal River Historical background at Klipdrift, later renamed Barkly West and in 1870 the first diamond digging operation in South Africa started here at Canteen Koppie (de The first diamonds reported in Africa were found in Algeria from Wit, 2008). By the end of that year it is estimated that some 5,000 the Ghoumel River near Constantine (Dufrénoy, 1834). Subsequently, people were living on the diggings (Babe, 1872). However, by early in 1854 diamonds were reported from the Reggane region in south- 1871 digging near Klipdrift had reduced dramatically. This drop in central Algeria in an area called Bila¯d al-m¯sa meaning country of the activity is attributed partly to other diggings opening along the Vaal diamond (Godard et al., 2014) and since 1975 some 1,500 diamonds (Pniel, Gong Gong, Hebron, Cawood’s Hope etc), but more have been recovered from the Pleistocene alluvial sediments in this importantly to the discovery of the ‘dry’ diggings (later to become area. However, no economic extraction has taken place. kimberlite mines) some 30 km east of Klipdrift. These were so named Mining of diamonds started in the south of Africa following since the weathered upper part of kimberlite pipes, also known as rumours of diamonds that had been circulating in the mid-1800s. yellow ground, was initially believed to be old river deposits and The first recorded diamond was the 21.25 carat (‘Eureka’) diamond many diggers moved on once the yellow ground was exhausted not found along the Orange River on the farm De Kalk, South Africa, by realising that the harder ‘blue ground’, or fresh kimberlite underneath, 15-year old Erasmus Jacobs in 1867. This stone attracted some also carried diamonds. XWXWXWXWXW XW XW XW XWXW XWXW XWXWXWXW XW XW XWXW XWXW XW XWXW XW XWXW XWXWXW XW XWXWXW XW XW XW XW XWXW XWXWXW XW XWXWXWXWXWXWXWXWXWXW XWXWXWXWXWXWXWXWXWXW XWXWXWXWXWXWXWXW XW XWXWXWXWXWXW XW XWXW XWXW XWXWXWXW XW XWXWXW XWXW Ca XW XWXWXWXW XWXWXWXWXW^_XW XW XW XWXWXWXW XWXWXW XWXW XWXW Legend XWXW XWXW XWXW XW XWXWXWXWXW XW XWXW XWXW XW XW XWXWXWXWXW XW XW XWXWXWXWXWXWXW XW Kimberlites XW XWXWXW XW XWXW XWXW XW Group 1 XW XW XW XWXW XW XWXW XWXW XW Group 2 XWXWXW XW XW XW XWXWXW XWXWXWXW Or XWXWXWXWXWXW XW XWXW XWXWVeXWXWXW Lamproites ^_XWXWXW XWXW XWXWXWXWXW XW XWXWXW XWXW^_XWXWXWXWXWXW XWXWXW Jw XW ^_ Tier-1 XWXWXW XWXWXW XW XWXWXWCu XWXWXWXW XWXWXWXWXWXWXWXW^_XWXW XWXWXW XWXWXW XWXWXWXWXWXW XWXWXWXWXWXW XWXW XWXW XW XWXWXW XWXW ^_XW XW Neoproterozoic crust XW XWXWXWXWXWXWXWXWXW XWXWXW XW XWXW XWXWXWXWXWXW XWXW XWXWXW XWXWXWXWXWXWXWXWXWXWXWXW XWXWXWXWXW Neoproterozoic remobilized Proterozoic XW XWXWXWXWXWXWXWXWXW XWXWXWXWXWXWXWXW XWXWXWXWXWXWXWXWXWXWXWXWXWXWXW XWXWXWXWXWXWXWXWXWXWXWXW XWXW XWXWXWXWXWXWXW Neoproterozoic remobilized Archean XWXWXWXWXW Meso- Paleoproterozoic Paleoproterozoic 0290 580 1,160 1,740 2,320 Archean Kilometers Figure 1. Geological map of the Precambrian basement of Africa (de Wit and Linol, 2015) with all kimberlites (red), those petrographically known as Group 1 (blue) and Group 2 (green) kimberlites, lamproites (black) and Tier-1 diamond deposits, labelled: Ca = Catoca, Cu = Cullinan, Jw = Jwaneng, Or = Orapa, Ve = Venetia. June 2016 201 The Koffiefontein pipe was discovered in July and Jagersfontein consists of two volcanic conduits that have coalesced near the surface in August of 1870. These were followed by the discoveries of the and which had an original area of 118 Ha before mining commenced. Dutoitspan and Bultfontein pipes in September and December Each of the conduits contains distinct kimberlite types (Fig. 2) with respectively of the same year in what later became the town of different diamond populations. The intrusion is dated at 93.1 Ma Kimberley (Davenport, 2013). It was at Jagersfontein that the first (Davis, 1977) and the upper portion of the pipe contains a sequence connection between diamond and a hard rock (viz. kimberlite) was of epiclastic kimberlite composed of shales, grits, sandstones and made. These discoveries were followed by the De Beers, Kimberley debris flows that were formed in a crater-lake. These deposits (both in 1871), Wesselton (1890), Lace (1896), Cullinan (1902) and contained a variety of Cretaceous fossil plants and insects (Rayner et Voorspoed (1906) pipes and a host of smaller occurrences discovered al., 1991). The older North Pipe contains crudely layered pyroclastic between 1870 and 1906, all in South Africa. kimberlite resembling massive volcaniclastic kimberlite (Scott-Smith The kimberlite discoveries in South Africa were followed by the et al., 2013), and not unlike diatreme tuffisitic kimberlite breccia discoveries of important secondary deposits in Namibia (1908), (Clement, 1982), with avalanched basalt breccia lenses around the Democratic Republic of Congo (DRC; Tshikapa - 1906, Mbuji Mayi periphery. The South Pipe has a more complex geology. Three phases - 1918), Angola (Lundas - 1912), Central African Republic (CAR - of intrusion have been identified, each separated by a sequence of 1913), Togo (1919), Ivory Coast (1929), Sierra Leone and Liberia basalt-rich breccias.
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