Salt River Resources Ltd Salt River Resources Ltd South Africa’ ’s Newest Mineral Oasis: s Newest Mineral Oasis: South Africa The Salt River Zn- -Cu Cu- -Pb Pb- -Ag Ag- -Au VMS Au VMS The Salt River Zn Deposit Deposit Craig R. McClung Craig R. McClung Current Exploration Projects in Africa Current Exploration Projects in Africa GSSA DPP Course GSSA DPP Course 18 April 2008 18 April 2008
Acknowledgements • Board of Directors • Thanusha Naidoo • PPM Group, University of Johannesburg – Prof. Jens Gutzmer – Keith Osburn – Akani Mathebula • Nic Norman
Disclaimer • This presentation is directed at individuals having advanced scientific and geologic knowledge. • No representation or warranty is given or implied by Salt River Resources Ltd, parent company Thabex Ltd, its’ directors, or their associates as to the accuracy or completeness of the information or opinions contained herein and no liability is accepted for any such information or opinions. • The presentation may contain certain forward looking statements that are subject to certain risks and uncertainties, e.g. the company’s plans, goals and prospects. Actual results may differ materially. • This presentation does not constitute an offer to purchase, sell, issue or subscribe for shares in Salt River Resources Ltd, Thabex Ltd or associated companies
Outline • Location • Namaqua Metamorphic Province • Salt River Deposit • Styles of Mineralisation • Geologic Model • Comparison • Classification • Summary
Location • Located in the metallogenically significant Namaqua Metamorphic Province • Occupies a crescent- shaped body covering over 80 000 km 2 • Hosts several economically- significant mineral districts and deposits Modified after Hartnady et al. (1985), Thomas et al. (1992; 1993) and Hanson (2003).
Namaqua Metamorphic Province • Western continuation of the Namaqua-Natal Metamorphic Belt • Extends from Olifantshoek to Atlantic Seaboard and Bitterfontein to Luderitz, Namibia • Characterized by poly-deformed and poly- metamorphosed volcano-sedimentary successions and intrusive igneous rocks • Deformed and metamorphosed during the Namaquan Orogeny • Metallogenically well endowed: – Volcanogenic Massive sulphides, Broken Hill-type, Magmatic Ni- Cu (Hondekloof), Intrusive Cu (Okiep), Cu-Mo Porphyries (Haib), Fe-Oxide-hosted Cu ± Au & vein-hosted REE-Th-Cu-Fe (IOCG ?), base ± precious metal veins, alluvial & marine diamonds, varies industrial minerals, uraniferous granites, etc.
Namaqua Metamorphic Province Based on structural, lithological, and geochronological differences, the NMP may be divided into four subprovinces (Kroner and Blignault, 1976): – Richtersveld Subprovince – Kheis Subprovince – Bushmanland Subprovinces – Gariep Subprovince Modified from Hartnady et al. (1985), Joubert (1986) and McClung (2006).
Bushmanland Subprovince • Eastern juvenile bimodal volcanic arc and associated metasedimentary rocks ( Areachap Terrain ) • Central and western metavolcano- sedimentary succession of metapsammo- pelitic schists and gneisses, quartzites, calc-silicate rocks and metabasic volcanic rocks intruded by syn- to post-collisional granitoids ( Kakamas, Aggeneys and Garies Terrains)
Deformational Events • D 1 – Orange River Orogeny (1700-1900 Ma; Blignault et al., 1983) – Solely restricted to the Richtersveld Subprovince – Solely restricted to the Richtersveld Subprovince – F – Tight, i Tight, isoclinal folds with tapering hinge zones and axial planes parallel to bedding – F 1 – 1 – Thrust faulting – northward directed – M 1 – Regional to contact upper greenschist-facies • D 2-3 – Namaquan Orogeny (1020-1220 Ma; Robb et al., 1999; Clifford et al., 2004) – – D D 2 (1180 (1180- -1220 Ma; O 1220 Ma; O’ ’okiepian Episode) okiepian Episode) 2 • F 2 – Isoclinal, symmetrical folds with rounded hinge zones that conc Isoclinal, symmetrical folds with rounded hinge zones that concentrate sulphides orebodies entrate sulphides orebodies • F 2 – • Thrust faults – – southwesterly directed, cross southwesterly directed, cross- -cut F cut F 2 and folded by F 3 folds • Thrust faults 2 and folded by F 3 folds • • M M 2 2 – – Regional to contact amphibolite Regional to contact amphibolite- - to granulite to granulite- -facies facies • Intrusion of the Little Namaqualand Suite and associated granitoids ids • Intrusion of the Little Namaqualand Suite and associated granito – D (1020- -1040 Ma ; Klondikian Episode) 1040 Ma ; Klondikian Episode) – D 3 (1020 3 • F 3 - Large-scale, open, asymmetrical folds responsible for preservation of metasediments responsible for preservation of metasediments • F 3 - • • M M 3 3 - - Regional Regional- -contact upper amphibolite contact upper amphibolite- - to granulite to granulite- -facies facies • Intrusion of Spektakel Suite and associated granitoids • Intrusion of Spektakel Suite and associated granitoids • D 4 – Post-Namaquan Deformation – Low angle extensional faulting – Low angle extensional faulting – F - N to NW N to NW- -trending monoclines trending monoclines – F 4 - 4 – – Late shear zones and strike- Late shear zones and strike -slip faults that cross slip faults that cross- -cut F cut F 4 4 – – M M 4 – – Retrograde Retrograde 4
In Good Company Modified from Norman (2006).
Salt River Deposit • Located 100km SW of Kakamas in the Northern Cape Province on the property Remainder of the farm Adjoining Geelvloer No. 197 (Kraandraai) • Geologically located in the supracrustal rocks of the Garies Terrain (Joubert, 1986; McClung, 2006) • Hosted by the Geelvloer Sequence, Kenhardt Subgroup of the Bushmanland Group (Paizes, 1975; Joubert, 1986) – Characterized by immature metasedimentary rocks (i.e. biotite schist/gneiss, para-amphibolite/calc-silicate rocks, feldspathic quartzites, cordierite gneisses) • Deposit located in the footwall of the Geelvloer (Shear Zone) Thrust • Age constraints on the mineralisation and host rocks suggest deposition occurred around 1300 Ma (Reid et al., 1997; McClung, 2006) • Mineralisation comprises stratabound “horizon” of massive to disseminated pyritic sulphides with elevated base metal contents – Historically interpreted as a metamorphosed volcanogenic massive sulphides hosted by bimodal metavolcanic rocks
Location - Salt River Deposit Looking East Looking East Salt River Salt River Deposit Deposit Putsberg Putsberg Deposit Deposit Looking West Looking West Prospecting Area Major Gravel Road Salt River Deposit
Mineralised Showings Graafwater Lovedale 198 Hartebeesvlei 201 199 Quagga-Maag 200 Gannapoort 202 Salt River Deposit Vaal-Kop 225 Putsberg Prospecting Area Adjoining 203 Major Gravel Road Geelvloer Farm Boundaries 197 Major Shear Zone Salt River Deposit 0 5 10km Mineralised Showing Modified after Maclaren (1988).
Salt River - Surface Trace Sub- -outcropping exposure outcropping exposure Sub Axis of orebody Axis of orebody
Exploration History • 1973 - USA-based Phelps Dodge Corporation identified an aeromagnetic anomaly that was followed up by geological mapping, geochemical surveys and widely spaced percussion and diamond drilling • 1977 - Gencor and Union Corporation conducted more diamond drilling and geophysics • 1981 - Gencor calculated a sub-economic Inferred Mineral Resource of 7.18 Mt @ 2.31% Zn, 0.86% Cu, 0.51% Pb, 24 g/t Ag & 0.64 g/t Au • 1993 - Goldfields conducted further regional mapping and limited diamond drilling (3 diamond drill holes) • 1995 - Pioneer Minerals (Pty) Ltd obtained the rights to the property and formed a joint venture with Thabex Ltd • 1997 - JV ended and Thabex exercised its rights to acquire the mineral rights in Thaba Egoli Mining & Exploration Ltd (100% held by Thabex) • 2005-2006 - Thaba Egoli drilled 26 closely spaced and two metallurgical diamond drill holes • 2007 - Thaba Egoli’s name was changed to Salt River Resources Ltd and estimated a new Measured and Indicated Mineral Resource
Deposit Confirmation Graafwater West Graafwater West Graafwater East Graafwater East Graafwater Graafwater Central Central 20 20° ° 25 25° ° Salt River Salt River deposit deposit outcrop outcrop
Drilling Program
Total Mineral Resource � Salt River West Occurrences Total Mineral Resource at Potential � Indicated Resources � Measured Resources Mineralization Salt River 14.13 Mt @ 1.8% Zn, 0.7% 9.97 Mt @ 1.8% Zn, 0.5% Project: 47.4 Mt 23.3 Mt @ 1.5% Zn, 0.7% Cu, 0.4% Pb, 19 g/t Ag Cu, 0.6% Pb, 21 g/t Ag Pb, 0.4% Cu, 21 g/t Ag & 0.7 g/t Au at 1% Zn & 0.5 g/t Au & 1.0 g/t Au threshold � Soutputs Noord Occurrence
Stratigraphy Not to scale.
Recommend
More recommend
