 | | Journal (issue) | | affiliated with the Friends of Mineralogy publisher John S. White Division of Mineralogy The Smithsonian...Arthur Roe Famous Mineral Localities: The Brumado District, Bahia, Brazil..................................Thomssen, Walt Risch, Star Northam, Carolyn Wilson, John Muntyan and Wayne DeBrusk assisted with record keeping...Brazil) Pierre and Nellie Bariand (Paris, France) F. John Barlow (Appleton, WI) Ron Bentley (Windsor, CT)...Cureton, David Wilber, Miguel Romero, Richard Webster, John Barlow and Rustam Kothavala made cash donations |  | | Journal (article/letter/editorial) | | todorokite from the Kalahari manganese field, South Africa J. Gutzmer and Nicolas J. Beukes Department...University, P.O. Box 524, Auckland Park 2006, South Africa e-mail: jg@na.rau.ac.za; njb@na.rau.ac.xa ABSTRACT...braunite-kutnahorite lutite at the Smartt Mine in the Kalahari manganese field, South Africa. Geological evidence and...place during Tertiary uplift and tilting of the South African Subcontinent. Careful chemical studies of... with fibre lengths up to 10cm, occur at Smartt mine in the Kalahari manganese field. The occurrence |  | | Journal (article/letter/editorial) | | Department of Geology, University of Johannesburg, South Africa e-mail: nickvafeas@gmail.com; ljolly@uj.ac.za;...Geological Society of South Africa. Abstract The manganese ore of the Hotazel Formation in the Kalahari...Kalahari Manganese Field is hosted within the Hotazel Formation, a chemosedimentary sequence of three...al., 1986). The Hotazel Formation is conļ¬ned to ļ¬ve erosional relics, namely the Hotazel, the Avontuur...the Blackridge thrust fault (Van Niekerk, 2006). SOUTH AFRICAN JOURNAL OF GEOLOGY 2018 ā¢ VOLUME 121.2 PAGE |  | | Journal (article/letter/editorial) | | Archean Mn deposits is striking, as is the massive Hotazel deposit at around 2.22 Ga. Several - sedimentary... West Africa Hotazel formation/Kalahari Mn ļ¬eld Minas Gerais, Brazil Koegas subgroup, S Africa 49 2200...sample. The absorption spectrum is sensitive to the local electronic and bonding environment of the absorbing...microscopically. Kutnohorite (cluster) Kutnohorite (Hotazel) Mn-calcite Rhodochrosite 2.1. Sample acquisition...described in Appendix A. Braunite Birnessite Cryptomelane 6530 2.2. Analytical methods We examined our |  | | Journal (article/letter/editorial) | | Department of Geology, University of Johannesburg, South Africa University College Dublin (UCD) School of Earth...Department of Geology, University of Johannesburg, South Africa e-mail: ljolly@uj.ac.za; fanusv@uj.ac.za P....University of Cape Town, South Africa e-mail: petrus.leroux@uct.ac.za Ā© 2019 Geological Society of South Africa...erosional relics of the iron- and manganese-rich Hotazel Formation. A total of 19 manganese ore samples...samples from the lower manganese ore horizon of the Hotazel Formation were selected for analysis based on their |  | | Journal (article/letter/editorial) | | Enrichment in the Kalahari Manganese Field, South Africa: A new discrimination scheme for Kalahari manganese...Department of Geology, University of Johannesburg, South Africa University College Dublin (UCD), School of Earth...thrust fault in the Kalahari Manganese Field, South Africa has undergone three signiļ¬cant alterations events...Mamatwan-type manganese ore from Mamatwan mine in the south of the Kalahari Manganese Field as a reference...multiple geological settings. The Paleoproterozoic Hotazel Formation of the Kalahari Manganese Field hosts |  | | Journal (article/letter/editorial) | | that the manganese peroxideminerals(pyrolusite, cryptomelane,etc.) are found only to a depth of about 100...minerals(Hew- portant contributionshave been made by John de ett and Fleischer,1960), and the GriqualandWest...0861-0128/88/192/1108-1152.50 Mn DEPOSITS, SOUTH AFRICA 1109 Geologic Framework .ā¢ ā¢:ā¢:ā¢:ā¢:ā¢:ā¢:ā¢:ā¢:ā¢:ā¢...Stellenbosch). 1110 j. E. DE VILLIERS proximatelynorth-south,and regionalshearingand (includingmetamorphic deposits)...ered with surface limestone and sand, and these cryptomelane,psilomelane,hollandite,braunite,and youngde |  | | Journal (article/letter/editorial) | | University RO. Box 524 AucWand Park, 2006 Gauteng, South Africa . . .*.ā. Corresponding author: bc @na.rau...just south of the great Kalahari Desert on the vast plains of the Northern Cape Province of South Africa...of the Transvaal Supergroup rocks (black) in South Africa. B: Enlarged portion of Griqualand West showing...and one of the few economic centers of the Northern Cape Province. Kuruman is also the preferred home...live in the mine villages of Hotazel and Black Rock. These were established by SAMANCOR (South African Manganese |  | | Journal (article/letter/editorial) | | separated iron from 30 manganese to produce cryptomelane microbialites, which agglutinated to form manganese...initially transformed the manganese oxides into cryptomelane and 36 then into hollandite. 2 37 KEY WORDS...environment 39 1. INTRODUCTION 40 The Urucum mining district occupies an area of approximately 800 km2 and...Urban et al. (1992) estimated that the Urucum district 47 contains more than 600 Mt of rock with high...environment, for the carbonate BIFs of the Santa Cruz Mine region 63 located on the southeastern part of |  | | Journal (article/letter/editorial) | | 960-1004 Precambrian Iron-Formations of Southern Africa N.J. BEUKES Abstract From existing information...1966) and Ierru#inous SOUTHERN Africa is definedas that part of Africa sedimentary rockslessthan 15 percentiron...percentiron. In this southof approximately16Ćø south-latitude and in- paper,the 15 percentboundaryis not...contentbecauseof a generallack of chemicalanalyses. South West Africa, and Mozambique. This rela(2) Iron-formationis...commonlithologic detailedstudyon iron-formation in southern Africa variety of iron-formationand consistsof chert mesoare |  | | Journal (article/letter/editorial) | | structures include hollandite, coronadite, and cryptomelane (2-octahedra x 2-octahedra tunnels containing...structural changestaking place upon heating cryptomelane. They found that the changeswere analogous to...accommodate the 3oloto 40loKrO in the original cryptomelane, although such a phase would likely be present...due to oxygen.Coronadite is isostructural with cryptomelane,and the thermal reactions of coronadite should...should be analogousto those observed for cryptomelane. MacKenzie and Berggren(1970) presentedconflicting |  | Fairey, Brenton J., Timmerman, Martin J., Sudo, Masafumi, Tsikos, Harilaos (2019) The Role of Hydrothermal Activity in the Formation of Karst-Hosted Manganese Deposits of the Postmasburg Mn Field, Northern Cape Province, South Africa. Minerals, 9 (7) 408 doi:10.3390/min9070408 | Journal (article/letter/editorial) | | Deposits of the Postmasburg Mn Field, Northern Cape Province, South Africa Brenton J. Fairey 1,ā , Martin J...Geology, Rhodes University, Grahamstown 6139, South Africa Correspondence: h.tsikos@ru.ac.za Current address:...Postmasburg Manganese Field (PMF), Northern Cape Province, South Africa, once represented one of the largest...Postmasburg manganese field; hydrothermal; karst; South Africa Minerals 2019, 9, 408; doi:10.3390/min9070408...(KMF), the Postmasburg Manganese Field (PMF) was South Africaās largest producer of this important component |  | | Report (issue) | | groutite. Association: Pyrolusite, hollandite, cryptomelane, coronadite. Distribution: Some localities...Mohave Co., and at the Mistake mine, Yavapai Co., Arizona; from the Idarado mine, near Telluride, San Miguel...Miguel Co., Colorado; in the Monroe-Tener mine, near Chisholm, St. Louis Co., Minnesota. Along the East River...Pradesh. At the Iron Monarch quarry, Iron Knob, South Australia. From the Otoshibetsu and Tanno mines...From BuĢtten-Adenstadt, Lower Saxony, and the Clara Mine, near Oberwolfach, Black Forest, Germany. At Gebel |  | | Journal (issue) | | 85741 Editor & Publisher Wendell E. Wilson Founder John Sampson White Associate Editors Pierre Bariand Sorbonne...Zeolites and associated minerals from the Palabora mine, Transvaal........................................& R. S. W. Braithwaite The Lake George antimony mine, New Brunswick ..................... 263 by W. E...Kalahari m an g an ese field, C ape Province, South Africa. (See th e article in this issue, b eg in n...d e r n M in e r a l C o l l e c t io n CURATION John Sampson White Department of Mineral Sciences Smithsonian |  | Santos, Felipe Holanda dos, Amaral, Wagner da Silva, Konhauser, Kurt, Martins, Douglas Teixeira, Castro, Marco Paulo de, Queiroga, Glaucia Nascimento, Chi Fru, Ernest, Andersen, Morten B. (2021) Unraveling sedimentary precursors and metal enrichment of high-grade metamorphosed manganese-rich rocks from the Borborema Province, northeastern Brazil. Ore Geology Reviews, 137. 104283pp. doi:10.1016/j.oregeorev.2021.104283 | Journal (article/letter/editorial) | | manganese silicates, and the manĀ ganese oxides cryptomelane (K[Mn4+, Mn2+]8O16) and pyrolusite (Mn4+O2)...Paleoproterozoic deposits in Ghana, Gabon and South Africa in the Nsuta, Moanda and Kalahari manganese...(northeastern Brazil) and Birimian succession from West Africa for the West Gondwana. (A) West Gondwana in the...rocks from South America (Chisonga et al., 2012; Cabral et al., 2019) and Ghana in West Africa (MĆ¼cke et...operational mining activities in the Lagoa do Riacho mine are relatively recent and date from 2011. Its activities |  | | Journal (article/letter/editorial) | | conversion of todorokite-birnessite. Pyrolusite and cryptomelane, conventionallyconsidered as diagenetic products...environments by hydrothermal/volcanogenic processes (e.g. Northern Apennine Ophiolitic Complex, Italy, Bonatti et...the lower Proterozoic Transvaal Supergroup, South Africa (Beukes, 1983, 1984; Miyano and Beukes, Dr...Mn4+-bearing oxides such as pyrolusite and/or cryptomelane stabilized by late diagenesis (Montagne Noir...primary oxides but are dominated by pyrolusite, cryptomelane and/ or psilomelane (roman~chite) or other Mn |  | | Journal (article/letter/editorial) | | manganese ores of the Postmasburg manganese field, South Africa J. GUTZMERAND N. J. BEUKES Department of Geology...University, P.O. Box 524, Auckland Park, 2006, South Africa Abstract The diagenetic to very low-grade metamorphic...peak metamorphic conditions. It is suggested that local variations of the metamorphic mineral association...Transvaal Supergroup, manganese ore, Postmasburg, South Africa. Introduction TIlE manganese ores of the Postmasburg...partridgeite* bixbyite manganite roman6chite cryptomelane manganomelane** lithiophorite pyrolusite ramsdellite |  | | Journal (article/letter/editorial) | | concentrated in a few districts, suggesting a more local than global control on manganese metallogenesis...also be separated when the dominant mineral is cryptomelane, manganite, nsutite, psilomelane, or todorokite... 538 J. BARRY MAYNARD Rhodochrosite Braunite Cryptomelane Manganite Pyrolusite Hausmannite Psilomelane...elements in Mn deposits would have been subject to local control by configuration of the sea floor and the...(Morey et al., 1991), whereas Fe-rich beds in the Hotazel BIF in the Kalahari Mn field average 0.73 to 1 |  | | Journal (article/letter/editorial) | | themselves may be banded, with layers of hausmannite, cryptomelane, braunite, and manganese carbonates alternating...et al., 1980a). The Hotazel formation of the Transvaal Supergroup in South Africa is the most spectacular...Wabush Iron-Formation (KLEIN, 1966), and the Champion Mine, Marquette County, Michigan (BABCOCK, 1968). Theories...(Mn>O.,) or to cryptomelane (KMneO16; FRENZEL, 1980), which are common phases in the Hotazel and Urucum BIFs...BABCOCK L. L. ( 1968) Manganese minerals from Champion mine, Marquette County, Michigan. Compass 45, 162- 170 |  | | Report (issue) | | Cover. Photograph of the Mamatwan open pit mine in South Africa. The black manganese layer is about 45 meters...folded layering is shown by the shapes of the various mine benches. Lighter material in the background is waste...Prospects for Future Supply Edited by Klaus J. Schulz, John H. DeYoung, Jr., Robert R. Seal II, and Dwight C...............................................L18 Mine Waste Characteristics ........................................................................L22 Mine Closure........................................ |  | | Journal (article/letter/editorial) | | (Karatau, Khubsugul, and South China basins), Australia (Georgina basin), Africa Fig. 1. Geological structure...Karatau range (Kazakhstan). (b) Section of the northern Tszyangsi Province (Bushinskii, 1966). (c) Section...Depression (Bushinskii, 1966). (d, e) Sections in the northern Sinan Depression (Bushinskii, 1966). (1) Gneisses...(11) Mn-bearing rocks. (Upper Volta, Benin), and South America (Minas Gerais basin). North America is the...FeāMn hydroxides. These ore minerals constitute local autonomous laminae alternating with thin layers |  | | Journal (article/letter/editorial) | | (d) Tetravalent manganese oxides (pyrolusite, cryptomelane, manjiroite, nsutite) (supergene). The primary...those of the New England Fold Belt (NEFB) to the south (part of the major Tasman geosyncline of the Australian...Manganese oxides occur as a lens of hard massive cryptomelane, showing metacolloidal textures, conformable...(Brooks 1962) England Fold Belt (NEFB) to the South (the simplest interpretation of the Gympie rocks)...intra-oceanic magmatic arc mobile belt now present in the South Island, New Zealand (Sivell and Waterhouse, 1987) |  | | Journal (article/letter/editorial) | | associated with sugilite from the Wessels Mine, South Africa: Crystal chemistry and 40Ar-39Ar dating EDWIN...silicate-rich sample from the Wessels mine, Kalahari manganese field, South Africa. The mineral forms centimeter-sized...submarine exhalative origin of the Hoskins mine in New South Wales, Australia (Ashley 1986; Eggleton and...occurring in pockets in the Wessels mine, Kalahari Mn field, South Africa (e.g., Cairncross et al. 1997),...1989; Sƶhnge 1977). The Mn deposits belong to the Hotazel member of the Griqualand West Sequence, and occur |  | | Journal (article/letter/editorial) | | Research Laboratories, P.O. Box I88, Wallsend, New South Wales 2287 (Australia) Department of Geology and...University of Adelaide, G.P.O. Box 498, Adelaide, South Australia, 5001 (Australia) (Revised and accepted...similar diagenetic to metamorphosed rocks in South Africa and South America the mineral is commonly considered...Geology from the Flinders University, Adelaide, South Australia. His research has centred on the stratigraphy...and Geophysics, University of Adelaide, Adelaide, South Australia. DIAGENETICBRAUNITEIN SEDIMENTARYROCKS |  | Pack, A., Gutzmer, J., Beukes, N. J., van Niekerk, H. S., Hoernes, S. (2000) Supergene Ferromanganese Wad Deposits Derived from Permian Karoo Strata along the Late Cretaceous-Mid-Tertiary African Land Surface, Ryedale, South Africa. Economic Geology, 95 (1) 203-220 doi:10.2113/gsecongeo.95.1.203 | Journal (article/letter/editorial) | | CretaceousāMid-Tertiary African Land Surface, Ryedale, South Africa A. PACK,ā ,* J. GUTZMER, N. J. BEUKES, H. S....University, P.O. Box 524, Auckland Park 2006, South Africa AND S. HOERNES Mineralogisch-Petrologisches...Ryedale mine situated 110 km west of Johannesburg in the northwestern province of South Africa. The wad...hosted by Karoo strata, namely the one at Ryedale mine situated 110 km west of Johannesburg (Fig. 1). Similar...The ferromanganese wad produced from the Ryedale mine is specifically supplied to gold mines of the Witwatersrand |
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