EGRU Seminars 2020

29 May 2020

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The tectonic and structural setting of Mt Isa Inlier – implications for deposit models and exploration potential

The Mount Isa Inlier of NW Australia is a giant metallogenic province that hosts world class Pb-Zn (±Ag, Cu), Cu-Au (±Mo, Co, U) and U-REE deposits. Although, the area experienced significant exploration activity and has been the subject to numerous academic studies, no major discoveries have been made for more than 20 years.  Given the lack of new discoveries, a critical assessment and re-evaluation of existing tectonic and deposit models is required.

Tectonic setting determines the type, timing and location of mineral deposits. For example, porphyry deposits occur in general at active convergent plate margins (continental and oceanic arcs) whereas SEDEX mineralisation occurs at passive continental margins and in zones of intracontinental rifting. Tectonic models for Mt Isa Inlier range from intracontinental rifting and intracontinental orogeny, to plume tectonics, back arc and active continental margin settings. The multitude of tectonic settings proposed for the Mt Isa Inlier, some at opposing end of the spectrum, highlight the complexity of the problem, and the difficulty of determining  the tectonic setting for ancient terranes. Nevertheless, exploration models are based on deposit models, which in turn are based on tectonic models, and, therefore, a thorough re-evaluation of the tectonic models for Mt Isa is necessary in order to improve deposit models and eventually drive new exploration models and exploration success.

Dr Peter BettsMonash University, Australia
Prof. Tom BlenkinsopCardiff University, United Kingdom
Dr Nick OliverHOCV Global, Australia
Dr Karen ConnorsUniversity of Queensland, Australia
Dr George GibsonAustralian National University, Australia
Dr Ioan SanislavJames Cook University, Australia
Host: Prof Paul DirksJames Cook University, Australia
2.00pm -  Introduction and setting the scene Paul Dirks
Tectonic & structural setting from large-scale geophysics 
2.15pm  - An appraisal of the tectonic models and drivers for the basin systems of the Mount Isa Inlier Peter Betts
2.35pm - Basement terranes and crustal architecture beneath the Mount Isa Inlier, eastern NAC; constraints from geophysics Karen Connors
2.55pm - Basin inversion, timing and possible implications for sediment-hosted Pb-Zn mineralisation in Western Succession  George Gibson
Tectonic & structural setting from the geology 
3.15pm - The origin of stresses for intraplate orogeny in the Mount Isa Inlier Tom Blenkinsop
3.35pm - 1780-1730 Ma extensional evolution around the Mary Kathleen Belt- implication for Au and U mineralisation Nick Oliver
3.55pm - Multiple orogenic events in the Mount Isa Inlier - implications for models for IOCG deposits Ioan Sanislav
4.15pm - Discussion and socialising 
5.30pm - Workshop closes

19 June 2020

IOCG Deposits: occurrence & diversity link

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The IOCG (iron oxide copper gold) deposits comprise a diverse family of ore deposits having a wide range of metal content and geological characteristics.  The primary metal extracted from IOCG deposits is Cu with Au having a secondary importance. It is common for IOCG deposits to contain important quantities of U, REE, Ag, Co, Mo and many other metals in small quantities. IOCG deposits occur in a variety of tectonic settings, have been described from all continents and, from Archean to Phanerozoic terrains. Although, they share some common geological characteristics, their diversity in metal content, alteration assemblages, geological and tectonic settings makes exploration for IOCG deposits challenging.

EGRU is taking this opportunity to invite you to a technical workshop comprising presentations by world experts on IOCG deposits from Brasil, Canada, South Australia and Mt Isa.

Prof. Roberto Xavier ADIMB and University of Campinas, Brasil
Prof. Hamid Mumin Brandon University, Canada
Dr Cristiana Ciobanu University of Adelaide, Australia
Dr George Case Geological Survey, USA
Prof. Paul DirksJames Cook University, Australia
Host: Dr Ion SanislavJames Cook University, Australia
Preliminary Program - all times are Australian Eastern Standard Time
10.00am - Introduction and setting the scene Ioan Sanislav
IOCG systems - general geology and district characteristics 

10:15am - Neoarchean and Paleoproterozoic IOCG systems of the Carajás Mineral Province, Amazon Craton, Brasil

Roberto Xavier
10:35 - IOCG mineralisation in the Great Bear Magmatic Zone, Northwest Territories, Canada Hamid Mumin
IOCG systems- deposit characteristics & diversity 

10:55am - Iron oxides from IOCG deposits: insights from the Olympic Dam district, South Australia

Christiana Ciobanu

11:15am - Ore genesis of the E1 group of IOCG deposits, Cloncurry district: implications for mineral system and exploration models

George Case

11:35am - Tick Hill deposit – an extreme IOCG end member?

Paul Dirks
11:55am - Discussion and socialising 
1:30pm - Workshop closes

Date: 09 October 2020

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The last 10 years has witnessed a significant trend towards renewable materials driven by the ever-increasing demand for green energy, electric vehicles, energy storage, robotics and nano-technologies.  Major economies, such as USA, EU, Japan, South Korea and Australia have established  national strategies to deal with supply and demand, and to encourage exploration for these minerals.

The basis of these new technologies, is a series of minerals known under the general term “critical minerals”. The term “critical” is used to define not only their importance for new technologies but also issues related to supply and demand. The list of critical  minerals includes, but is not limited to: REEs, Ga, W, PGE, In, Co, Ni, Nb, Mg, Mo, Sb, Li, V, Ni, Ta, Te, Cr, Mn and Cu.  Critical minerals generally do not occur as separate deposits, but mostly as by-products of other commodities.  In many cases the geological processes, leading to the enrichment of these minerals is not well understood.

EGRU is taking this opportunity to invite you to attend a technical workshop with presentations by world experts on critical minerals geology from Australia, Germany and United Kingdom.

Prof. Nigel Cook University of Adelaide, Australia
Prof. Gregor Borg Martin-Luther University, Germany
Assoc. Prof Dan Smith University of Leicester, United Kingdom
Host: Dr Helen McCoy-West James Cook University, Australia 
Preliminary Program - all times are Australian Eastern Standard Time
3.00-3.10pm -  Introduction and setting the scene Helen McCoy-West
3.10 - 3.35pm - Critical mineral deposits: why detailed mineralogical characterisation is crucial Nigel Cook
3.35 - 4.00pm -  Old dog learn new tricks? European copper as a strategic metal in use, recycling, mining and exploration potential Gregor Borg
4.00pm - 4.25pm -  Tellurium through the crust Dan Smith
4.25 - 5.00pm -  Discussion 
5.00pm -  Workshop closes