DOCSLIB.ORG

Mount Isa Mines Rehabilitation Materials Sampling and Analysis

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Mount Isa Mines Rehabilitation Materials Sampling and Analysis Mount Isa Mines Rehabilitation Material Sampling and Analysis Program for Closure Planning Matt Landers1, Greg Maddocks1, Candice Nucifora2, Kristian Mandaran2, Jason Jones2, Amanda Forbes3, Ward Wilson4, Steven Newman5 1RGS Environmental Pty Ltd, PO Box 3091, Sunnybank South, Queensland, Australia, 4109, [email protected] 2Mount Isa Mines, Glencore Pty Ltd, Australia 3Deswik Mining Consultants Pty Ltd, Level 22, Riparian Plaza, 71 Eagle St, Brisbane, QLD 4000, Australia 4Unsaturated Soils Engineering Ltd., 960 Massey Court NW, Edmonton, AB, Canada, T6R 3S8 5Newman Engineering Pty Ltd, Melbourne, Australia Abstract Glencore’s Mount Isa Mines Limited (MIM) has completed the second phase of the rehabilitation materials sampling and analysis plan (RMSaAP) to identify and quan- tify potential materials that can be used to rehabilitate the large tailings storage facility (TSF) with an earthen cover system sourced from adjoining hills. Samples, collected from a test pit/ drilling program, were analysed to evaluate chemical/ physical proper- ties of regolith within major rock/ soil types. Results were used with Deswik so ware to develop a stratigraphic 3-D overburden model to delineate rehabilitation borrow sourc- es and schedule the TSF cover placement, and to undertake unsaturated zone modelling to evaluate the cover performance. Keywords: Soil Cover | Deswik | Mount Isa Mines | Rehabilitation | TSF | AMD | Mine planning Introduction period of weathering, as ANC is depleted, the Glencore’s Mount Isa Mines Limited (MIM) neutral pH drainage may contain elevated operates the Mount Isa open cut and under- concentrations of some elements including ground copper (Cu) and zinc-lead (Zn/Pb) sulfate, manganese and zinc. Only when the mines near Mount Isa in Queensland, Aus- ANC is depleted would the tailings then be- tralia. Tailings from processed Cu and Zn-Pb gin to produce acid drainage. ore is contained in a 1,315 ha shallow (< 35 e main environmental risks posed by m deep) multi-cell valley ll tailings storage the tailings are the potential for (i) the physi- facility (TSF). cal movement of tailings or sur cial e ores- Static geochemical testing conducted by cent salts by aeolian processes, and (ii) the MIM over the life of mine (LoM) veri es that release of acid, major ions, metals and metal- the Cu, and Zn-Pb tailings have variable sul- loids from the tailings solids and the perco- de content and diverse mineralogy with sig- lation of these elements in solution into and ni cant acid neutralising capacity (ANC) in through the surrounding regolith, and to a some samples. e tailings are predominantly lesser degree through the tailings that may re- classi ed as potentially acid forming (PAF) sult in surface seeps, percolation to basement using static analytical methods. Kinetic leach regolith below the TSF and/or deeper perco- testing using free draining columns and hu- lation to bedrock. It is assumed tailings solids midity cell tests simulating tailings placed on and solutes would not be released from the the surface of the TSF suggest that the tailings TSF in surface water as the TSF is designed samples are likely to remain non-acid form- with su cient storage capacity. ing (NAF) for ≈7 years under aerial exposure, e overall management goal for the TSF and much longer than this under anoxic satu- is to maintain ongoing tailings deposition on rated conditions within the TSF. During this the tailings beach and then implement reha- Wolkersdorfer, Ch.; Sartz, L.; Weber, A.; Burgess, J.; Tremblay, G. (Editors) 21 01_Mining for closure BOOK.indb 21 9/3/18 10:22 AM 11th ICARD | IMWA | MWD Conference – “Risk to Opportunity” bilitation strategies a er the nal placement A soil horizons for each test pit, and select in- of tailings before sur cial ANC is depleted tervals from the core. in the tailings. is management approach e geochemical analytical methods in- should ensure that potential adverse envi- cluded continual downhole hyperspectral ronmental impacts are minimised as the PAF mineralogy by HyLoggerTM, pH/ EC, NAPP, tailings will continue to produce neutral pH CEC/ ESP, metal(loid)s analysis and nutrient drainage. In practice the decommissioning and organic carbon content. Physical analyti- and rehabilitation of the TSF will occur pro- cal methods included texture, porosity, den- gressively as TSF cells reach maximum design sity, particle-size-distribution (PSD), point storage capacity. load and abrasion testing, Emerson aggregate erefore, the current rehabilitation ob- analysis, Atterberg limits, hydraulic conduc- jectives for the TSF are to cover the tailings tivity and soil water characteristic curves. with an earthen cover system which is (i) safe e results from physical testing (parti- to humans and wildlife (ii) non-polluting (iii) cle-size-distribution, soil water characteris- stable, and (iv) able to sustain native vegeta- tic curves [SWCC] and saturated hydraulic tion. e earthen cover system design cur- conductivity) for the material types within rently proposed for the TSF comprise the the borrow areas were used to undertake - placement of a 1.5 m thick geochemically in- niteelement unsaturated ow modelling us- ert borrow material layer directly on the tail- ing SEEP/W (formerly VADOSE/W) (GEO- ings with a 0.5 m growth media layer overly- SLOPE International, 2016; GEO-SLOPE ing the borrow material. International, 2008a, b). e SWCC used in the modelling were corrected for particle Methods size according to the Bouwer-Rice correc- To achieve the rehabilitation objectives, MIM tion procedure (Bouwer and Rice, 1984) and is implementing a progressive RMSaAP. e tted with the equation by Van Genuchten work described in this study (Phase 2 of the (1980). e hydraulic conductivity function RMSaAP) aims to identify and quantify the (suction [kPa] versus hydraulic conductivity potential materials that can be used for re- [m/s]) was estimated using the measured ksat habilitation and landform design at MIM: and extrapolated using the Fredlund method at a broad scale within the project area. e (Fredlund et al., 1994). A two-dimensional earthen cover system requires soil and rego- (2-D) slice through the TSF with overlying lith to be sourced from adjoining hills that cover system, including growth medium (Fig. include volcanic, sedimentary and metamor- 1), was simulated under transient conditions. phic units overlain by ferrosol, rudosol and e models comprise a climatic ux-bound- chromosol soil pro les. A test pit and drilling ary on the surface which allows true climatic program was undertaken to collect samples conditions to be applied (rainfall, evapora- to (i) evaluate the variability of the chemical tion and evapotranspiration), with several and physical properties of the regolith within ux boundaries within each cover layer (and the major rock and soil types, and (ii) estab- within the tailings) to determine in ltration lish the depth and degree of weathering in (and capillary rise) rates. Since the tailings the hills (iii) used as input to numerical un- are de-watered there is no water table within saturated zone modelling to evaluate prob- the TSF; therefore, the lower boundary con- able cover performance (iv) map-out poten- dition of the models was simulated with unit tial borrow areas (shallow areas to strip soil) hydraulic gradient. Similarly, lateral inter ow and borrow pits to mine deeper regolith, and of water above the tailings was allowed to exit (v) to schedule the movement of the soil and the model via seepage face. As part of the as- regolith onto the TSF. sessment, the cover material thickness and e drilling and test pit program included texture were varied, and runo and in ltra- 30 test pits and ve PQ diamond core drill tion values provided as performance indica- holes placed within each of the major mate- tors. rial types or potential borrow areas. Samples Deswik.CAD so ware (Deswik.CAD were collected (nominally) from the O, E and v2017.2) was used to develop a concept level 22 Wolkersdorfer, Ch.; Sartz, L.; Weber, A.; Burgess, J.; Tremblay, G. (Editors) 01_Mining for closure BOOK.indb 22 9/3/18 10:22 AM 11th ICARD | IMWA | MWD Conference – “Risk to Opportunity” rial for rehabilitation, and no substantial dif- ferences in the pH, EC, NAPP or metal(loid) content in topsoil (0 to 0.5 m bgl), subsoil (0.5 to 2.0 m bgl) or deeper soil and regolith below 2.0 m. ere may be issues in the soil cover sys- tem relating to chemical imbalances (e.g. CEC) and biological aspects such as nutrient de ciencies, particularly if the upper topsoil layer is diluted with subsoil. Samples that were composited prior to analysis had the fol- lowing results: • Soil from 0.to 0.5 m bgl had the follow- ing averages pH 6, EC 45 µS/cm, CEC 5.4 meq/100g, ESP 0.5%, TKN 197 mg/kg, Bray P 2.2 mg/kg and TOC 1,283 mg/kg. • Soil from 0.5 m to 3 m bgl had the follow- ing averages pH 7.5, EC 62 µS/cm, CEC 4.9 meq/100g, ESP 0.3%, TKN 78 mg/kg, Bray P 0.8 mg/kg and TOC 766 mg/kg. • Regolith > 3 m bgl had the following averages pH 8.3, EC 53 µS/cm, CEC 1.3 meq/100g, ESP 0% (n=7) and 25% (n=1), TKN was BDL, Bray P was BDL and TOC Figure 1 VADOSE/W model geometry and mesh. was BDL (n=7) and 400 mg/kg (n=1). From the perspective of the physical material stratigraphic 3-D overburden model incor- properties, the surface material in all borrow porating a 2 m deep soil pro le and underly- areas is mostly non-dispersive and is domi- ing regolith. Mining of soil and regolith from nated by material with low clay content.
Load more

Recommended publications
  • From Base Metals and Back – Isamills and Their Advantages in African Base Metal Operations
    The Southern African Institute of Mining and Metallurgy Base Metals Conference 2013 H. de Waal, K. Barns, and J. Monama From base metals and back – IsaMills and their advantages in African base metal operations H. de Waal, K. Barns, and J. Monama Xstrata IsaMill™ technology was developed from Netzsch Feinmahltechnik GmbH stirred milling technology in the early 1990s to bring about a step change in grinding efficiency that was required to make Xstrata’s fine-grained lead/zinc orebodies economic to process. From small-scale machines suited to ultrafine grinding, the IsaMill™ has developed into technology that is able to treat much larger tonnages, in coarser applications, while still achieving high energy efficiency, suited for coarser more standard regrind and mainstream grinding applications. The unique design of the IsaMillTM, combining high power intensity and effective internal classification, achieves high energy efficiency and tight product distribution which can be effectively scaled from laboratory scale to full-sized models. The use of fine ceramic media also leads to significant benefits in downstream flotation and leaching operations. These benefits are key drivers for the adoption of the technology into processing a diverse range of minerals worldwide, and offer major opportunities for power reduction and improved metallurgy for the African base metal operations. Keywords: IsaMill, regrind, energy efficiency, inert grinding. Introduction The development of the IsaMillTM, by MIM (now GlencoreXstrata) and Netzsch Feinmahltechnik GmbH, was initiated to enable the development of the fine-grained ore deposits at Mt Isa and McArthur River in Northern Australia. To liberate the valuable minerals and so produce a saleable concentrate this ultrafine-grained ore needed to be ground to a P80 of 7 μm.
    [Show full text]
  • Orica's Flotation Reagents Increase Copper Recovery Rates, Resulting in a $2M Increase in Gross Revenue
    Greater understanding, improved performance Orica’s flotation reagents increase copper recovery rates, resulting in a $2M increase in gross revenue WHO WAS THE CLIENT? combined with sodium isobutyl Xstrata Mount Isa Mines form one xanthate (SIBX). As a result, DSP 330 “The best flotation of the largest underground mining was chosen for plant trial. operations in the world. The plant trial supported the initial performance was The mines, based in North laboratory results, with copper achieved with the Queensland, produce both copper recovery improving by 3%. 50:50 addition ratio and zinc-lead-silver. Established Further laboratory testing and plant in 1924, 5,700 employees and trials conducted by Mount Isa Mines of DSP 330 and contractors today work across found an improvement in overall SIBX, with a copper Xstrata Mount Isa’s twin mining recovery of 3.5%. As a result, and processing streams. DSP 330 was adopted as specialty recovery of 92.4% for collector of choice when treating a head grade of 5.4% WHAT WERE THE CHALLENGES? slow cooled copper slag. Xstrata needed to improve copper and a cut-off copper recovery and called on Orica to WHAT WERE THE KEY grade of 24-25%.” identify and test collectors. OUTCOMES? Orica formulated a collector that would enhance milling and Pengfu Tan, Alberto Galvez, Lucya Yunus– Mount Isa Mines flotation of slow cooled copper slag. Identification of Ultimately, the process needed to achieve superior recovery of copper superior collector at a natural pH over a specific grind fineness. Xstrata’s key requirements were to: Optimised flotation • Identify superior collectors performance • Reduce reagent costs • Optimise flotation performance • Integrate improvements into 3.5% improvement existing operations in copper recovery HOW DID ORICA HELP? Orica developed a laboratory test work program using Xstrata’s current Reduction in performance as a benchmark.
    [Show full text]
  • Grained Pyrite in the Mount Isa Copper System
    Trace Element Variation of Coarse- Grained Pyrite in the Mount Isa Copper System Thesis submitted in accordance with the requirements of the University of Adelaide for an Honours Degree in Geology Shauna Maguire-Olstad November 2016 Shauna Maguire-Olstad Mt. Isa Coarse-grained Pyrite TRACE ELEMENT VARIATIONOF COARSE-GRAINED PYRITE IN THE MOUNT ISA COPPER SYSTEM MT.ISA COARSE-GRAINED PYRITE ABSTRACT The unique Mount Isa system, northwest Queensland, contains two world class deposits of copper and lead-zinc, which have a complex spatial relationship. The formation of the copper mineralization has long been debated, and occurs in a close spatial and temporal association with silica-dolomite alteration and coarse-grained pyrite (Pyrite 2). The geochemical characteristics of coarse-grained pyrite has not previously been studied and it is believed to hold valuable insight into the fluid evolution of the Mount Isa Copper System. Using LA-ICP-MS analysis, trace element variation of Pyrite 2 was investigated for numerous elements including Ag, As, Ba, Co, Cu, Mo, Ni, Pb and Zn across an explorative transect (drill hole 0406ED2), which passed through the alteration halo of the 1100 orebody. The trace element composition of Pyrite 2 was not consistent throughout the 0406ED2 transect and it does not appear to be controlled by host lithology. The analysis determined the Pyrite 2 grains formed during, or in close association with, the ore-mineral enriched hydrothermal fluid. Pyrite 2 data is consistent with the Mount Isa system having undergone multiple hydrothermal fluid events or from an evolving hydrothermal fluid. The trace element variation of Pyrite 2 is consistent with the currently established paragenesis and is indicative of the concurrent Cu, Pb and Zn mineralising system formed during protracted hydrothermal events.
    [Show full text]
  • Evolution of the Isamill™ Into Magnetite Processing
    EVOLUTION OF THE ISAMILL™ INTO MAGNETITE PROCESSING Greg Rasmussen, Xstrata Technology Pty Ltd Tommy Do , Ernest Henry Mining Michael Larson, Xstrata Technology Pty Ltd Katie Barns, Xstrata Technology Pty Ltd Xstrata Technology • Mount Isa Mines (MIM), a large Australian mining company, was acquired by Xstrata in 2003 who then merged with Glencore in 2013 • MIM internal technology group was re-named Xstrata Technology (XT) and became an independent technology developer and supplier to the global minerals industry with 250 staff worldwide • The equipment and processes which are marketed by XT are developed in our own operations • XT offers full-package solutions including: • Equipment and processes • Engineering • Commissioning and Training • Dedicated after-market support IsaMill™ Technology Development ™ • Development of IsaMill driven by inability Broken Hill to efficiently treat fine grained orebodies • Late 1980s, Xstrata required 7µm grind for new Pb/Zn orebodies in Australia • Conventional mining technologies tested (1975-1990), but 0 40 micron − Too high power consumption to achieve target size McArthur River − Ball/tower mills ineffective below 20-30μm − Negative influence of steel grinding on flotation 0 40 micron IsaMill™ Technology Development A technology was found... • Horizontal Bead Mills − Used in industries other than mining (pharmaceuticals, paint, food, etc.) − Small, batch scale − Very expensive and exotic media types • Cross-over into mining required: − Much larger scale − Continuous operation − Ability to use cheap,
    [Show full text]
  • Isamill™ Technology Used in Efficient Grinding Circuits
    1 IsaMill™ Technology Used in Efficient Grinding Circuits B.D. Burford1 and L.W. Clark2 High intensity stirred milling is now an industry accepted method to efficiently grind fine and coarse particles. In particular, the IsaMill™, which was invented for, and transformed the fine grinding industry, is now being included in many new comminution circuits in coarser applications. While comminution has always been regarded as important from a processing perspective, the pressure being applied by environmental concerns on all large scale power users, now make highly energy efficient processes more important than ever. The advantages that were developed in fine grinding in the early IsaMill™ installations have been carried over into coarse grinding applications. These advantages include a simple grinding circuit that operates in open circuit with a small footprint, the ability to offer sharp product size classification, as well as the use of inert media in a high energy intensive environment. This paper will examine the use of IsaMill™ technology in fine grinding (P80 below 15 micron), and examine the use of the technology in conventional grinding applications (P80 20 - 150 µm). Recent installations will be examined, including fine and coarse grinding applications, as well as the recent test work that was undertaken using an IsaMill™ in a primary grinding circuit, and the resulting circuit proposal for this site. While comminution has been relatively unchanged for the last century, the need to install energy efficient technology will promote further growth in IsaMill™ installations, and result in one of the biggest challenges to traditional comminution design. 1. Senior Process Engineer, Xstrata Technology, L4, 307 Queen Street, Brisbane 4000, Qld, Australia 2.
    [Show full text]
  • Mount Isa Mines Employee Lead Information Guide July 2010 Xstrata Mount Isa Mines Conducts Personal Dust Monitoring On-Site
    Mount Isa Mines Employee Lead Information Guide July 2010 Xstrata Mount Isa Mines conducts personal dust monitoring on-site Xstrata Mount Isa Mines’ zinc-lead operations has in place a ‘Site Use Only’ clothing policy, which reduces Recycled process water is used to hose down potential hygiene risks for workers on-site and the Mount Isa community and recover fine lead dust at the lead smelter Continued uncontrolled exposure to lead has at Xstrata Mount Isa Mines the health and safety the potential to cause more serious symptoms of our employees and the Mount Isa community such as: ■ kidney damage; is our highest priority ■ nerve and brain damage. Of course, these symptoms can also be the result of reasons other than lead exposure. Our operations How lead is absorbed into the body If you are a woman capable of having children Xstrata Mount Isa Mines has comprehensive you should take special care to follow good programs in place to manage and minimise Lead can be absorbed into the body through work practices and a high standard of occupational exposure to lead and other two main pathways: personal hygiene. contaminants. We also have a strict ‘clean in/clean out’ policy to minimise the risk of ■ Inhalation: Lead may be absorbed through lead and other contaminants being taken the lungs by breathing fine particles of dust Occupational exposure to lead into the community. or fumes containing lead. Potential sources of lead exposure in your ■ Ingestion: Lead may be absorbed through Lead exists in a number of our mine’s work occupational settings include: the stomach and intestine after it enters areas.
    [Show full text]
  • Thermochemical Modelling of the Isasmelt Process
    A thermochemical model is also essential to determine the process conditions when comparing processing Thermochemical Modelling of the Isasmelt options. Process Since 1992 a model of the Isasmelt process has been under development which uses a spreadsheet as the front end for the CHEMIX module of the CSIRO Thermochemistry System1 and the following solution models: • The activity coefficient correlations of Shimpo et al 2 for James S. Edwards the matte phase, and Mount Isa Mines Limited • The Regular Solution Model (RSM)3 for the slag phase. Mount Isa, Qld 4825, Australia Telephone (077) 442011 Thermodynamic data for all species, except Al203, is taken from the CSIRO Thermochemistry System. Thermodynamic data for Alz03 is taken from Barin, Knacke and Kubaschewski4. ABSTRACT The CHEMIX model has been verified against plant 5 control samples and campaign heat and mass balances . A A thermochemical model of the Isasmelt process as good fit is obtained between the model and plant above a applied to copper smelting has been developed. The model 55% Cu matte grade. Shortcomings of the model include: uses a commercial free energy minimisation method and • FeS as the iron sulfide species in the matte rather than thermodynamic databases. The slag is assumed to be a FeS1.09. regular solution; The matte solution model is based on • All condensed species in the liquid standard state, published activity coefficient correlations. i.e. thermodynamic data for some species has been extrapolated over several hundred degrees. For a 60% Cu matte the calculated Fe and S in matte 3 2 • Oxidised Fe + /oxidised Fe + • in matte as calculated were 16% and 23% respectively.
    [Show full text]
  • Mount Isa Mines Incident
    News release Mount Isa, Wednesday 18 June 2014 Mount Isa Mines incident Mount Isa Mines confirms we are currently searching for one of our employees who was last seen underground at Mount Isa Mine’s Copper operations around 11.30am today (Wednesday 18 June 2014). Emergency procedures were activated and we are currently trying to locate the missing person in conjunction with the Police. Operations in the area have ceased while we search for our missing employee. Ends Media contacts Michelle Connolly Maryann Wipaki Telephone +61 7 4744 3144 Telephone +61 7 4744 8805 Mobile +61 478 325 738 Mobile +61 419 736 685 Email [email protected] Email [email protected] Mount Isa Mines Limited ABN 87 009 661 447 Notes to editors About Glencore Xstrata Glencore Xstrata is one of the world’s largest global diversified natural resource companies. As a leading integrated producer and marketer of commodities with a well-balanced portfolio of diverse industrial assets, we are strongly positioned to capture value at every stage of the supply chain, from sourcing materials deep underground to delivering products to an international customer base. The Group’s industrial and marketing activities are supported by a global network of more than 90 offices located in over 50 countries. Our diversified operations comprise over 150 mining and metallurgical sites, offshore oil production assets, farms and agricultural facilities. We employ approximately 190,000 people, including contractors. For more information visit www.glencorexstrata.com. About Mount Isa Mines Mount Isa Mines operates two separate mining and processing streams, copper and zinc-lead-silver, to deliver natural resources that have enduring roles in our society.
    [Show full text]
  • Seismic Reflection Imaging of Mineral Systems;
    SEISMIC REFLECTION IMAGING OF MINERAL SYSTEMS; THREE CASE HISTORIES. by B.J. Drummond1, B.R. Goleby1, A.J. Owen1, A.N. Yeates1, C. Swager2, Y. Zhang3 and J.C. Jackson4 1 Australian Geological Survey Organisation, P.O. Box 378, Canberra, A.C.T., 2601, Australia. 2 Geological Survey of Western Australia, 100 Plain Street, Perth, W.A., 6000, presently at North Ltd, PO Box 231, Cloverdale, W.A., 6105 3 CSIRO, Division of Exploration and Mining, Nedlands, W.A., 6009, Australia 4 Mount Isa Mines Exploration, presently at Sons of Gwalia, 16 Parliament Place, West Perth, W.A., 6005, Australia. Page 1 ABSTRACT Mineral deposits can be described in terms of their mineral systems, ie., fluid source, migration pathway and trap. Source regions are difficult to recognise in seismic images. Many orebodies lie on or adjacent to major fault systems, suggesting that the faults acted as fluid migration pathways through the crust. Large faults often have broad internal zones of deformation fabric, which is anisotropic, and this, coupled with the metasomatic effects of fluids moving along faults while they are active, can make the faults seismically reflective. For example, major gold deposits in the Archaean Eastern Goldfields Province of Western Australia lie in the hanging wall block of regional-scale faults that differ from other faults nearby by being highly reflective and penetrating to greater depths in the lower crust. Coupled thermal, mechanical and fluid flow modelling supports the theory that these faults were fluid migration pathways from the lower to the upper crust. Strong reflections are also recorded from two deeply penetrating faults in the Proterozoic Mt Isa Province in northeast Australia.
    [Show full text]
  • Glencore 2020 Corporate Profile Australia
    2020 CORPORATE PROFILE AUSTRALIA 18,720 employees and Australia’s contractors in largest Australia producer of coal to provide reliable power in Asia Cover photo: Workers in full personal protective gear at Glencore’s George Fisher Mine in north-west Queensland One of Australia’s A leading largest mining producers of technology copper, cobalt, business nickel and zinc This page: Planning tasks at Glencore’s Mount Isa Mines complex, north-west Queensland About Glencore We are one of the world’s largest natural resources companies. We own and operate a diverse mix of assets all over the world, and we’re engaged at every stage of the commodity supply chain. Global operations 160,000 Employees and contractors Diversifi ed by commodity, 60 geography Commodities across a range of metals, minerals and and activity energy sectors 3,000 Employees in marketing 1,200 Vessels on the ocean at • Fully integrated from mine any one time to customer • Presence in over 35 countries 7,000+ across 150 operating sites Long-term relationships with • Producing and marketing about suppliers and customers 60 commodities • Diversifi ed across multiple suppliers and customers www.glencore.com 2 Glencore 2020 Corporate Profi le Australia Our business model covers Metals & Minerals and Energy, which are supported by our extensive global Metals & Energy Marketing marketing network. Minerals The right Well-capitalised, commodity mix low-cost, high- for changing return assets needs • Future demand patterns • Since 2009, over US$45 billion for mature economies are has been
    [Show full text]
  • The Source of Lead Pollution at Mount Isa and the Likely Health Impacts
    EDITORIALS Recognising and responding to the obvious: the source of lead pollution at Mount Isa and the likely health impacts Niels C Munksgaard, Mark P Taylor and Alana Mackay Blood lead levels in children in Mount Isa are substantially elevated, and a purported lack of knowledge of the lead source is no longer tenable nvironmental lead levels and blood lead concentrations in Australian mining- and smelting-related blood lead levels children at Mount Isa, in north-western Queensland, are and government and industry responses9 substantially elevated compared with background values1-3 E Port Pirie, South Australia and, as a consequence, there is a public health risk. This problem is exacerbated by the reluctance of stakeholders, including • Early 1980s: high blood lead levels (BLLs) confirmed Xstrata Mount Isa Mines Ltd, operator of Mount Isa Mines • 1984 onwards: decontamination and demolition of residences, (MIM), and Queensland environmental and health authorities to slag dumps covered, emissions controlled acknowledge and respond effectively to the fact that the main • 2004: BLLs decreased but remain elevated environmental lead source is mining and smelting activity.1,2 It is Broken Hill, New South Wales frequently claimed that the lead source is natural surface miner- • Early 1990s: high BLLs confirmed 4-6 alisation; this is not the case. • 1994 onwards: land and home evaluation and remediation Mount Isa city, located immediately adjacent to MIM, is a • 2006: BLLs decreased but remain elevated major lead, zinc and copper producer, and Australia’s largest Boolaroo, NSW atmospheric emitter of sulfur dioxide, lead and other metals.7 The Medical Journal of Australia ISSN: 0025- • Early 1990s: high BLLs confirmed The emissions are likely to have had an impact on the blood lead 729X 2 August 2010 193 3 131-132 • 1991 onwards: emissions controlled level (BLL) of a significant proportion of the city’s population of ©The Medical Journal of Australia 2010 • 1997: lead abatement of homes aboutwww.mja.com.au 21 000.
    [Show full text]
  • Uranium Exploration in Queensland, 1967-71
    QUEENSLAND DEPARTMENT OF MINES URANIUM EXPLORATION IN QUEENSLAND, 1967-71 by J. H. Brooks ! „ REPORT No. 69 GEOLOGICAL! SURVEY OF QUEENSLAND J. T. Woods Chief Government Geologist QUEENSLAND DEPARTMENT OF MINES URANIUM EXPLORATION IN QUEENSLAND, 1967-71 by J. H. Brooks ^..•Vi-.V-.-;., REPORT No. 69 GEOLOGICAL SURVEY OF QUEENSLAND J. T. Woods Chief Government Geologist WF * Co W2 TABLE OF CONTENTS Page SUMMARY 1 INTRODUCTION 1 HISTORY OF EXPLORATION I AIRBORNE R2VDIOMETRIC SURVEYS 2 DRILLING 2 RESERVES 4 DISTRIBUTION 6 EXPLORATION 6 Westmoreland 6 Caltor. Hills 8 Paroo Creek 8 Gorge Creek 10 Spear Creek 10 Mary Kathi'een 10 Georgina Basin 11 Georgetown 11 Mesozoic Sedimentary Basins 12 FUTURE OUTLOOK 14 REFERENCES 15 TABLES Table 1 Drilling for uranium in Queensland - annual footages 3 Table 2 Queensland uranium reserves 5 Table 3A Uranium exploration under Authority to Prospect, 1965-71 16 Table 3B Uranium exploration by the Bureau of Mineral Resources 19 Table 4 Drilling for uranium in Queensland - individual deposits 20 FIGURES Figure 1 Areas of Queensland covered by airborne radiometric surveys Opposite 1 Figure 2 Drilling for uranium in Queensland, annual totals 4 Figure 3 Locality plan, uranium occurrences, Westmoreland area 7 Figure 4 Locality plan, uranium occurrences, Mount Isa area 9 Figure 5 Post-Triassic sedimentary basins in Queensland 13 QUEENSLAND SHOWING URANIUM EXPLORATION IN QUEENSLAND 1967-71 by J, H. Brooks Geolot ical Survey of Queensland SUMMARY Exploration for uranium revived in 1967 after a period of little activity, and a peak was reached in 1970, when drilling for uranium totalled 143, 920 feet, and numerous airborne and gronnd ra-iiometric surveys were carried out.
    [Show full text]