 | | Journal (issue) | | Geological Society of Zimbabwe Newsletter February, 2009 Geological Society of Zimbabwe G Z S Newsletter...across the Perseverance Nickel Belt, Chakari – Mike Kellow THE GEOLOGICAL SOCIETY OF ZIMBABWE, P.O. BOX...1719, CAUSEWAY, HARARE Geological Society of Zimbabwe Newsletter February, 2009 Contents EDITORIAL... 4 The Indigenisation of the Mining Sector in Zimbabwe, A Reality Check and Practical Perspective .……...9 Open Pit Operations and Grade Control at Ngezi Mine ...…………………………………….. 9 Use of a Niton XRF instrument |  | | Journal (article/letter/editorial) | | VOLUME 39 NUMBER 10 PAGES 1689–1720 1998 Chromite in Komatiites, 1. Magmatic Controls on Crystallization...1997; REVISED TYPESCRIPT ACCEPTED APRIL 16, 1998 Chromite is a widespread accessory mineral in komatiites...and the composition of the coexisting olivine. Chromite is least abundant in highly magnesian chrome-undersaturated...lower than the expected cotectic proportions. Chromite compositions reflect variations in lava composition...post-eruption processes. Extensive reaction of chromite with trapped liquid causes decreasing Mg/(Mg + |  | | Journal (article/letter/editorial) | | ARTICLE Thermomechanical erosion at the Alexo Mine, Abitibi greenstone belt, Ontario: implications...et al. (1999). Section ES (eastern section: Alexo Mine) is the location of the stratigraphic column in...penetratively deformed. Until 2001, most of the mine horizon remained covered by quaternary glacial deposits...water-filled trench and mine shaft. However, between 2001 and 2003, the mine area was mechanically and...of the mine environment, and to discuss the genesis of the Ni–Cu–(PGE) ores at the Alexo Mine. Geological |  | | Journal (article/letter/editorial) | | relationship is also seen further south, where the Perseverance ultramafic complex consists of a thick central...dunite bodies. The Waiter Williams Formation, in the west-central part of the Norseman-Wiluna Belt, is a very...to lower lava flow rates. Field evidence from Perseverance, and the general geometry of the dunite lenses...Australia, 6076; ** M.P.I. Pty. Ltd., 1 Walker Ave., West Perth, Western Australia, 6005. scribe these cumulate-dominated...exceptionally pure, coarsegrained olivine or olivine-chromite adcumulate, which can occur in two different ways: |  | | Journal (article/letter/editorial) | | applied to many other deposits and camps, notably Perseverance (Barnes et al., 1995), the Forrestania deposits...deposits (Perring et al., 1995), Hunters Road in Zimbabwe (Prendergast, 2001) and Black Swan, Western Australia...AUDK Perseverance 60A U’mafic Perseverance Dunite lens Perseverance North flows Perseverance South flows...North Yakabindie flows Barberton Komati Valley Perseverance Mt. Keith Eastern 192 U’mafic Unit Mt. Keith...Keith Western 42 U’mafic Unit 131 Perseverance – Lower Flows and Rocky’s Reward GS GS lowermid GS Sub-GS |  | Lambert, D. D., Foster, J. G., Frick, L. R., Hoatson, D. M., Purvis, A. C. (1998) Application of the Re‐Os isotopic system to the study of Precambrian magmatic sulfide deposits of Western Australia. Australian Journal of Earth Sciences, 45 (2) 265-284 doi:10.1080/08120099808728386 | Journal (article/letter/editorial) | | some disseminated ore samples from the 2.7 Ga Perseverance deposit (Yilgarn Craton). We attribute this...Kambalda as well as olivine-sulfide cumulates from Perseverance and Mt Keith yield a magmatic Re-Os isochron...by which the Archaean komatiites at Kambalda, Perseverance and Mt Keith achieved sulfide saturation. However...sulfide deposits such as those at Kambaida, Perseverance and Mt Keith (Western Australia) and Alexo,...komatiite-hosted nickel sulfide deposits at Kambalda, Perseverance, Mt Keith and Ruth Well; the Munni Munni Complex; |  | | Journal (article/letter/editorial) | | PETROLOGY VOLUME 41 NUMBER 3 PAGES 387–409 2000 Chromite in Komatiites, II. Modification during Greenschist...REVISED TYPESCRIPT ACCEPTED SEPTEMBER 2, 1999 Chromite compositions in komatiites are influenced by metamorphic...processes, particularly above 500°C. Metamorphosed chromite is substantially more iron rich than igneous precursors...Mg–Fe exchange with silicates and carbonates. Chromite metamorphosed to amphibolite facies is enriched...at low temperature. Significant Al is lost from chromite cores above 550°C, as a result of equilibration |  | Rosengren, N. M., Grguric, B. A., Beresford, S. W., Fiorentini, M. L., Cas, R. A. F. (2007) Internal stratigraphic architecture of the komatiitic dunite-hosted MKD5 disseminated nickel sulfide deposit, Mount Keith Domain, Agnew-Wiluna Greenstone Belt, Western Australia. Mineralium Deposita, 42 (8) 821-845 doi:10.1007/s00126-007-0139-1 | Journal (article/letter/editorial) | | deposits in the world, such as Mount Keith, Perseverance, and Six Mile Well/ 822 Yakabindie (Burt...AWB trends NNW–SSE and is bounded to the east and west by voluminous Archaean granitoids and terranescale...units dip steeply (subvertical in places) to the west (Fig. 1), whereas igneous textures and geochemical...paper was conducted synproduction with the MKD5 mine operation and benefited from access to a significantly...significantly larger database of drillcore and mine-related information in comparison to most previous studies |  | | Book | | and human beings. When I first visited Sukinda chromite belt in 1964, it was a sleeping hamlet, gifted...the area was only for small-scale production of chromite ore for the indigenous market. M/s Ferro Alloys...born hills appear parallel to Mahagiri range due to mine-waste dumping. Unpaved roads serve the movement...The sky is gloomy throughout the day due to the mine and road dust. Social evils, crime, alcoholism,...thesis on the Sukinda chromite deposits of Orissa, India. Mining for chromite had just begun in the country |  | Sproule, R. A., Lesher, C. M., Houle, M. G., Keays, R. R., Ayer, J. A., Thurston, P. C. (2005) Chalcophile Element Geochemistry and Metallogenesis of Komatiitic Rocks in the Abitibi Greenstone Belt, Canada. Economic Geology, 100 (6) 1169-1190 doi:10.2113/gsecongeo.100.6.1169 | Journal (article/letter/editorial) | | crystallization and/or accumulation of olivine, chromite, or clinopyroxene and, rarely, loss of sulfide...Damba-Silwane-Shangani, Kambalda, Mt. Keith, Perseverance), some are not (e.g., Boa Vista, Forrestania...Mickel showing in southern Munro township; Alexo mine, the Dundeal and Dundonald deposits in Dundonald...komatiitic peridotites and dunites. Relict igneous chromite is commonly preserved as disseminated lobate and...normally partially to completely replaced by Fe-rich chromite in cumulate rocks. Relict igneous pyroxene is |  | | Journal (article/letter/editorial) | | of small mined deposits of this class occur in Zimbabwe, but comparable resource figures for individual...Superior Province, using large databases of 755 Zimbabwe Raglan Abitibi Pechenga Thompson Belt EGS...and/or terranes discussed in this paper. Abitibi West includes only the Ontario portion of the Abitibi... Eastern G’Fields - Kalgoorlie Terrane Abitibi West 10,000 Abitibi East (Dumont, Marbridge) Widgiemooltha...Goliath Moak Dumont sill Mystery Lake South Perseverance Thompson Mount Keith EGS Kurnalpi terrane 756 |  | | Journal (article/letter/editorial) | | 60 2006a). In addition, a single Ni-Co laterite mine and numerous lateritic resources are present 61...metamorphism. In some cases, such as in the Perseverance area and in parts of the 195 Kambalda Dome...which only olivine (with 217 or without minor chromite) crystallizes (Arndt, 1976). This, together with...mal origin. 293 In the Youanmi Terrane to the west (Figure 1) greenstone sequences date back to 3080...restricted to a 409 narrow belt from 5 km south of Perseverance to Wiluna within the Agnew-Wiluna Belt and |  | | Journal (article/letter/editorial) | | in the countryrock. At the northernlimit of the mine area, the baseof the dunite is separatedfrom the...of felsicvolcanic rocks.At the southernlimit of mine development,the dunite directly overliesthe matrix...GeologicSetting THE Agnew (formerly known as Perseverance) nickel depositis the largestknownaccumulationof...the overturned eastlimb (averagedip about80øto the west)of a D2 1986; Barneset al., 1988a; Hill et al.,...need of reevaluation. This paper nizable in the mine area is a set of 1- to 70-m-ampresents some of the |  | | Journal (article/letter/editorial) | | Komatiite-hosted Hunters Road nickel deposit, central Zimbabwe: physical volcanology and sulfide genesis M. D...PRENDERGAST 1 Carson Close, Greendale, Harare, Zimbabwe (marprend@hotmail.com). The nickel sulfide-bearing...komatiites, nickel sulfides, volcanology, xenoliths, Zimbabwe. INTRODUCTION GEOLOGICAL SETTING Hunters Road...low-grade, nickel sulfide resource in central Zimbabwe and the country’s most important undeveloped komatiite-hosted...presently under investigation. Hunters Road lies on the west limb of a north-trending, slightly overturned, anticlinal |  | | Journal (article/letter/editorial) | | Komatiite-hosted Hunters Road nickel deposit, central Zimbabwe: physical volcanology and sulfide genesis M. D...PRENDERGAST 1 Carson Close, Greendale, Harare, Zimbabwe (marprend@hotmail.com). The nickel sulfide-bearing...komatiites, nickel sulfides, volcanology, xenoliths, Zimbabwe. INTRODUCTION GEOLOGICAL SETTING Hunters Road...low-grade, nickel sulfide resource in central Zimbabwe and the country’s most important undeveloped komatiite-hosted...presently under investigation. Hunters Road lies on the west limb of a north-trending, slightly overturned, anticlinal |  | Locmelis, Marek, Arevalo, Ricardo D., Puchtel, Igor S., Fiorentini, Marco L., Nisbet, Euan G. (2019) Transition metals in komatiitic olivine: Proxies for mantle composition, redox conditions, and sulfide mineralization potential. American Mineralogist, 104 (8) 1143-1155 doi:10.2138/am-2019-6914 | Journal (article/letter/editorial) | | and Al-depleted komatiites from the Kaapvaal and Zimbabwe Cratons in southern Africa, the Yilgarn Craton...early crystallizing minerals, such as olivine and chromite, are potentially better shielded from subsequent...2009) in the Belingwe greenstone belt (Zimbabwe Craton, Zimbabwe); 2.7 Ga Alexo (Puchtel et al. 2004) in... 2009), Murphy Well (Locmelis et al. 2011), Perseverance (Locmelis et al. 2013), and The Horn (Locmelis...Craton Barberton greenstone belt Weltevreden 3.3 Zimbabwe Craton Belingwe greenstone belt Tony’s Flow 2 |  | | Report (issue) | | interest in the geo logy and mineral resources of Zimbabwe which followed the removal of United Nations sanctions...original Bulletin is the insertion of Table IIIA, Zimbabwe Mineral Production and Value, on page 114A. Due...for views of Wankie Colliery and the Trojan nickel mine, and to the Photographic Section of the Ministry...near Salisbury. facing page 23 IV Trojan Nickel Mine, near Bindura. facing page 33 V The Great Dyke...Complex. VI Chrome seam in the Great Dyke, Vanad Mine. VII Lower Karoo Landscape. No. 1 Colliery, Wankie |  | | Journal (issue) | | Geological Society of Zimbabwe G S Z Newsletter October 2016 No. 3 of 3 of 2016 Mesas and Buttes...Society of Zimbabwe, P.O. Box CY 1719, Causeway, Harare Geological Society of Zimbabwe Newsletter ...in the Musengezi Subchamber of the Great Dyke, Zimbabwe ... A brief overview of a field trip to the Pongola...17 20 NEWS Geology Department, University of Zimbabwe – Maideyi Meck …………… The Professor Tom Blenkinsop...Blenkinsop UZ Geology Field Trip Fund ………………. Zimbabwe School of Mines News to the Geological Society ………………… |  | | Journal (article/letter/editorial) | | elements Komatiites Iridium Ruthenium Rhodium Olivine Chromite a b s t r a c t A large body of new data (over...spinifex-textured rocks to pure olivine and olivine–chromite adcumulates. The data set is restricted to Carius...to eliminate the effects of addition of cumulus chromite, and addition or segregation of magmatic sulfide...Ruthenium shows some evidence for limited control by chromite, but anomalous Ru enrichment is also found in...accumulated chromite or sulfide. Neither Rh nor Ir shows evidence for any detectable control by chromite. The |  | | Journal (article/letter/editorial) | | replacement product of chrome spinel in the Nepean and Perseverance nickel-iron sulphide deposits of Western Australia...and to substitution of Fe and Ni for Cu. At Perseverance, valleriite, with minor admixed chrome spinel...metamorphism. Introduction Post-magmatic alteration of chromite and chrome spinel in ultramafic rock is a very...alteration has been observed [3]. The replacement of chromite by sulphides, however, has rarely received mention...mineral, suggested as being daubr6elite, around chromite grains in samples from the AMSOC core near Puerto |  | Dowling, S. E., Barnes, S. J., Hill, R. E. T., Hicks, J. D. (2004) Komatiites and nickel sulfide ores of the Black Swan area, Yilgarn Craton, Western Australia. 2: Geology and genesis of the orebodies. Mineralium Deposita, 39 (7) 707-728 doi:10.1007/s00126-004-0438-8 | Journal (article/letter/editorial) | | of these chromites match those from Kambalda, Perseverance and other localities, and are inconsistent with...Hicks MPI Mines Ltd., Level 1, 28 Kings Park Road, West Perth, 6005 WA, Australia The Black Swan ultramafic...m wide (up to 150 m in the deeper levels of the mine, not investigated in this study). The total resource...higher metamorphic grade localities such as Perseverance (Barnes et al. 1988; Libby et al. 1998), Kambalda...displacements typically less than 5 m found throughout the mine area. The Silver Swan orebody is directly overlain |  | | Journal (article/letter/editorial) | | Springer-Verlag 1995 Printed in Austria Poikilitic chromite in komatiitic cumulates S. J. Barnes and R. E...March 24, 1994; accepted May 2, 1994 Summary Chromite is a widespread accessory mineral in olivine-rich...komatiitic lavas. The distribution and crystal habit of chromite is related to the degree of differentiation of...93 mol percent typically contain no chromite at all, while chromite forms clusters of disseminated euhedral...mol percent. In the forsterite 91-93 interval, chromite may develop lobate interstitial habits. In the |  | | Journal (article/letter/editorial) | | giant nickel sulfide deposits such as those at Perseverance and Mt. Keith. © 2011 Elsevier B.V. All rights...komatiite-hosted Ni–Cu–PGE deposits such as Mt. Keith and Perseverance (Barnes et al., 2011). The Agnew-Wiluna Belt...2007). The Agnew-Wiluna Belt terminates in the South-West at the Lawlers antiform, a complexly deformed assemblage...intense mylonitization extending South of the Perseverance mine (Fig. 1). Following this N. Thébaud et al...196–197 (2012) 234–246 bodies at Mt. Keith, Perseverance and Honeymoon Well (Hill et al., 1995; Hill |  | Godel, Bélinda, Barnes, Stephen J., Gürer, Derya, Austin, Peter, Fiorentini, Marco L. (2013) Chromite in komatiites: 3D morphologies with implications for crystallization mechanisms. Contributions to Mineralogy and Petrology, 165 (1) 173-189 doi:10.1007/s00410-012-0804-y | Journal (article/letter/editorial) | | DOI 10.1007/s00410-012-0804-y ORIGINAL PAPER Chromite in komatiites: 3D morphologies with implications...samples representing a range of volcanic facies, chromite contents and degrees of alteration and metamorphism...of sizes, shapes and degrees of clustering that chromite grains display as a function of cooling history...history. Dendrites are spectacularly skeletal chromite grains formed during very rapid crystallization of...cooling rates in the interiors of thick flows, chromite forms predominantly euhedral grains. Large clusters |  | Lesher, C. M., Burnham, O. M., Keays, R. R., Barnes, S. J., Hulbert, L. (2001) TRACE-ELEMENT GEOCHEMISTRY AND PETROGENESIS OF BARREN AND ORE-ASSOCIATED KOMATIITES. The Canadian Mineralogist, 39 (2) 673-696 doi:10.2113/gscanmin.39.2.673 | Journal (article/letter/editorial) | | disseminated Ni–Cu–(PGE) sulfides (e.g., Kambalda, Perseverance, Raglan, Thompson) appear to have crystallized...& Arndt 1995, Lesher & Keays, unpubl. data); Perseverance, Western Australia (Barnes et al. 1988, 1995);...greater than 1. Available data for Kambalda, Perseverance, Raglan, and Thompson are summarized in Figures...member (Lesher & Arndt 1995). Perseverance, Western Australia The Perseverance Ultramafic Complex (PUC) occurs...al. 1998). The Ni–Cu–(PGE) mineralization at Perseverance occurs as variably tectonized stratiform massive |
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