«Time Program Presenter 8.45am Registration and coffee on arrival Session 1 – Geological Society of Queensland (Chair: Geoff Dickie, QEC) 9.00am ...»
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Time Program Presenter
8.45am Registration and coffee on arrival
Session 1 – Geological Society of Queensland
(Chair: Geoff Dickie, QEC)
9.00am Welcome and opening comments Dr Geoff Dickie, QEC Chairman
Spinifex Geochemistry and Discovery of a New
9.10am Dr Ken Collerson, HDR Program Metallogenic Province in SW Queensland The use of GSQ regional datasets, such as Dr Laurie Hutton, Geological Survey
9.40am deep seismic reflection profiles, in exploration of Queensland
W h e n:
programmes Wednesday 18 February 2015 Late Palaeozoic Mineral Systems of north east Vladimir Lisitsin, Geological Survey of
8.45am– 5.00pm Queensland Queensland
10.40am Morning Tea (20 minutes)
W h er e :
Session 2 – Industry Royal On The Park (Chair: Lindsay Crutch, HDR) Avro Room Analytical Laboratories….Far more to offer than Brian Williams, ALS Minerals – Global 152 Alice Street
11.00am Fire Assays and Acid Digests Brisbane Efficient, Deep Penetrating EM (DPEM) Dr Malcolm Cattach, Gap Geophysics Systems for the Detection of High Conductance Australia Pty Ltd
Co st :
Orebodies $100+GST Drilling innovations for the 21st Century Andrew Elf, Mitchell Services
In this presentation, results of a spinifex biogeochemical study undertaken by HDR in the Simpson Desert, SW Queensland, for the GSQ, will be presented. The area was chosen because indications of Cu mineralisation had been reported in core by Krucible Metals. Magnetic images indicate that the Krucible tenement straddles a terrane boundary or suture between the prospective eastern Arunta Block and the southern Mount Isa Block.
More than 3000 spinifex samples were analysed from a number of traverses normal to the NW-SE
magnetic trend in the basement lithologies. Characteristic element associations and chondritenormalised REE patterns allowed three styles of mineralisation to be inferred:
• Mafic/ultramafic rocks with potential for Au, Cu and Ni mineralisation on the terrane boundary between the Arunta and Mt Isa Blocks;
• Epithermal/mesothermal Au, Ag & Cu in calc alkaline granites;
• Phoscorite-carbonatite pipe complexes with potential for Cu, PGEs, REE and Sc mineralisation.
Core from two magnetic anomalies in the area, previously drilled as IOCG targets by AusQuest Ltd., confirmed the presence of phoscorite-carbonatite pipe complex lithologies and constrained their age to Middle Devonian (386±2 Ma). Discovery of these phoscorite-carbonatite pipe complexes in SW Queensland is very significant. Phoscorites are extremely rare rocks and have only been reported from 21 of the ~527 identified global occurrences of carbonatite. Furthermore, phoscorites invariably contain multi-element styles of mineralisation; including platinum group metals (PGEs), rhenium (Re), gold (Au), copper (Cu), scandium (Sc), rare earth elements (REE) yttrium (Y), phosphorus (P), uranium (U) and thorium (Th). This mineralisation is either primary, within the pipe, or it may be secondary, within a carapace of carbothermal alteration.
Based on interpretation of magnetic and gravity anomalies, there appear to be 32 phoscoritecarbonatite targets (Diamantina Alkaline suite) in this part of SW Queensland. They are interpreted to be part of a 2000 km long plume track extending from NSW (Fifield), through SW Queensland to the NT (Merlin kimberlite). This track formed between ~444 Ma and ~365 Ma, when proto-Australia drifted over the Pacific Superplume. As diamond bearing kimberlites are commonly emplaced during periods of plume magmatism (e.g., Kola Peninsula Russia, northern Finland, Southern Africa and North America), this Silurian-Devonian plume track could explain the abundance of micro diamonds and diamond indicator minerals in the eastern Northern Territory. The Diamantina Alkaline Province is an important new metallogenic province in Australia for PGE, REE, HFSE, Cu, P, Sc and diamond exploration.
Ken Collerson, PhD, FAusIMM, has degrees from the University of New England (BSc. Hons.) and Adelaide University (Ph.D.). He established an international career in academia at Memorial University of Newfoundland, Research School of Earth Sciences at ANU, University of Regina and the University of California Santa Cruz. From 1992 until 2010, as Professor of Earth Sciences at the University of Queensland, he restructured the Geology Department and established a world class isotope and trace element geochemical facility. He has published more than 100 research papers in peer-reviewed international journals, including several in Nature and Science. Ken now works as a Principal Consultant with HDR where enjoys applying his academic knowledge and practical experience to a varied range of exploration projects. He is an authority on REE and technology metal mineralisation in carbonatites and related rocks, and has recently developed a geodynamically-based exploration model for shoshonite-hosted epithermal Au-Ag systems.
Session 1 – Geological Society of Queensland The use of GSQ Regional datasets – including deep seismic reflection profiles and their contribution to mineral exploration
Geological Surveys have long contributed to mineral exploration by the provision of regional geological datasets. This includes the first and second generation geological maps which have underpinned the discovery of many of the current mines. Other examples include broad scale igneous geochemistry which is used in many mineral deposit models. The collection of regional geophysical (magnetic, gravity and radiometric) data have allowed for extension of outcropping geology into areas of poor outcrop. As a new phase is entered where exploration for the next generation of orebodies is under cover or poorly exposed, new datasets are required.
In the past mineral deposit models have been the mainstay of exploration. However when looking undercover, a broader approach – mineral systems modelling – is required in order to understand which mineral models are applicable.
Recently the Geological Survey has been undertaking several deep seismic reflection profiles across the Mount Isa Inlier. How are these likely to assist mineral explorers? The answer lies in our ability to better understand the tectonics and geodynamics of the region. This helps in better understanding which mineral systems may be present in the area, allowing for better target definition. Drill holes in undercover areas can reveal only part of the story, so a better understanding of the setting can only enhance exploration success.
Several examples will be given where deep seismic data have enhanced our understanding of potential mineral systems.
Laurie Hutton graduated from the University of Queensland in 1972, completing honours the following year. Since then he has been involved in regional geological mapping in Queensland.
From 1975 until 1981, he was involved in the geological mapping programme at Mount Isa. Since then he has mapped in the Atherton region, Mount Coolon, Charters Towers, and Anakie. In 2004, he was awarded a Doctor of Philosophy for a thesis on the igneous and metamorphic history in the Pentland area of Queensland. He has specialised in the geochemistry and petrology of igneous rocks.
From 2004-2009, he was involved in remapping of the Mount Isa terrane utilising the latest geophysical images. This project included deep crustal seismic profiling.
In 2010 Laurie led a team putting together a second edition of the popular North West Queensland Mineral & Energy Study which was be released early in 2011.
From 2011 to 2013, Laurie has been involved in managing a group charged with exploration Attraction of investors in Queensland. Laurie is currently a Project Manager in the Minerals area of the GSQ. His interests at the moment include looking at prospects for Rare Earth Elements and Critical elements in Queensland and has been involved in the interpretation of deep seismic reflection profiles in the Mount Isa Inlier in Queensland.
Session 1 – Geological Society of Queensland
Major intrusion-related gold, silver and base metal mineral deposits have underpinned significant mining activities in north-east Queensland. A comprehensive 3-year research project is currently under way, aiming to characterise intrusion-related mineral systems in the region and facilitate significant new discoveries. The project is funded under the Queensland Government’s Industry Priorities initiative and implemented through collaboration between James Cook University, Terra Search, Klondike Exploration and the Geological Survey of Queensland. The presentation will provide a high-level overview of intrusion-related mineral systems in the region and describe current and future project activities.
Vladimir Lisitsin is the economic geology project leader in GSQ. Over the past 12 years, he has worked in the geological surveys of Victoria and Queensland. He specialises in regional mineral resource assessments, prospectivity analysis, exploration targeting and general mineral systems research, focusing on hydrothermal orogenic gold and intrusion-related gold and base metals mineral systems. He is currently managing a 3-year collaborative research project on intrusionrelated mineral systems in north-east Queensland.
Session 2 – Industry Assay Laboratories.Far more to offer than Fire Assays and Acid Digests
The perception that Geochemistry assay lab service offerings are limited to ‘Fire Assays and Acid Digests’.could not be further from the truth. Acknowledging current tight market conditions, diminished exploration budgets, increasing aggregate exploration costs and the business agility required by explorers in managing multiple projects across extensive geographies, ALS has invested in a number of techniques and deliverables to extract greater value out of exploration dollars. The ALS Minerals offering breaks the boundaries of the traditional assay lab, and includes a number of innovative services and techniques such as Hyperspectral Analysis and Interpretation; Pb Isotope detection; Ionic Leach/Partial Extraction;
Super Ultra Trace Detection; Clay Fractionation; and Portable XRF Services.
Brian Williams began his career with ALS in 1986, initially employed as a laboratory chemist conducting Geochemical digests and determinations by AAS. Brian managed on site and near site Geochem assay laboratories in the 80’s in North and Central Queensland before taking on the role of building the ALS Environmental Division in 1991. Brian took on the multidivisional role of ALS (Australia) General Manager in 2005 prior to his current position of Group General Manager of the ALS Global Mineral Division in 2012. Brian is qualified with a BSc (Environmental), Diploma in General Mngt, GAICD and MRACI and AUSIMM.
Session 2 – Industry Efficient Deep Penetrating EM Technologies for High Conductance Orebodies
Airborne EM (AEM) is routinely used as a primary exploration technique for the detection of conductive orebodies. AEM has the benefit of rapid acquisition and is a relatively cost-effective technique for covering large areas. However the depth penetration of AEM will always be limited by relatively high transmit frequencies, minimal stacking time and small dipole moments. Ground level EM (GEM) surveys are commonly used as either a primary exploration tool or to follow up AEM anomalies. They can achieve much greater depth penetration than AEM due to the ability to employ low Tx frequencies, long station occupation time, large dipole moments and very stable sensors. However, the requirement to establish large loops and have stationary readings means that they are consequently slow and expensive. Budget constraints usually dictate wide line spacing and station intervals. GEM surveys are therefore generally spatially under-sampled as a result.
As exploration extends to greater depths and budgets tighten, it is clear that the industry requires techniques capable of significantly improving the cost-effectiveness of deep search EM surveys.
Recent advances in Sub-Audio Magnetics and High Power Transmitter technologies have meant that dynamic acquisition of high quality, Deep Penetrating ElectroMagnetics (DPEM) is now a commercial reality. Examples are presented from trials conducted at the Forrestania EM Test Range and the Fraser Range in Western Australia. Also presented are the results of a recent HeliSAM Fixed Loop EM trial over the Lalor VMS Deposit in Manitoba.
Malcolm Cattach received BSc, MSc and PhD degrees from the University of New England (UNE). He was one of the founders of the Geophysical Research Institute (GRI) which developed some of the world’s first rapid sampling, digitally recording Cs vapour magnetometers. Malcolm’s PhD focussed on the development of the Sub-Audio Magnetics (SAM) technique. SAM was conceived as a method by which the rapid sampling methodologies developed for High Definition Magnetic surveying could be utilised to improve the effectiveness and efficiency of electrical and electromagnetic surveying techniques.
Malcolm is Chief Geophysicist and Managing Director of Gap Geophysics Australia Pty Ltd which was formed in 2005 to commercialise and further refine the SAM technique. Mal is also a founder and Managing Director of Gap GeoPak Pty Ltd which was formed in 2007 and has pioneered the development of a new generation of high powered geophysical transmitters. Malcolm is an Active Member of the ASEG and the SEG. He is the recipient of several Research Awards from the ASEG including three Graham Sands Awards for “Innovation in Applied Geoscience”. His career has been committed to the development, commercialisation and promotion of unique Australian geophysical survey technologies.
Session 2 – Industry