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GeoPub launches in Melbourne

GeoPub get-togethers provide an opportunity for geoscientists to catch up on the industry “goss”, have a few drinks, talk technical, reminisce, and/or generally socialise.

Starting on the 8th of July, and continuing every second Friday of the month, GeoPub Melbourne aims to become a regular event
on any geologist’s social calendar.

GeoPub Melbourne will be held at The Sherlock Holmes, 415 Collins St. Melbourne CBD

Contact for further information.

Geopub Melbourne


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Extracting knowledge from limited data is arguably one of the greatest challenges inherent in the evaluation of all mineral resources.

Drilling, essentially, provides “points of observation” that must be put into a three dimensional context by carefully analysing variability exhibited in geological, geotechnical and grade / mineral composition parameters in order to develop a robust, reliable interpretation of deposit structure and resource potential.  Best practice is beginning to insist that geoscientists involved in resource evaluation also attempt to develop an understanding of inherent risk in geological models and grade estimates which, in turn, may influence development of mining plans and practices.

The geological knowledge for any deposit evolves with every new drill hole and the changes must be continuously assessed for their signifance by the project team.

As explorers are forced to look deeper and in more challenging geophysical environments, is becoming more important for geoscientists to fine-tune their survey methods in order to gain maximum value from limited data sets. Two examples of this continual improvement will be discussed from the Eagle Ni-Cu Mine in Michigan, USA. The high grade Eagle Ni-Cu mine is hosted by an ultramafic Proterozoic magmatic feeder that intruded into the metasediments of the Proterozoic Baraga Basin. There is limited outcrop in the area due to a covering of glacial till and a thick portion of the Baraga Basin is very conductive and magnetic due to pyrrhotitic sediments. The till thickness varies from 0 to over 200 m and complicates the interpretation of gravity survey data. The very conductive metasediments limits the depth of penetration of conventional surface based ground EM surveys and complicates the interpretation and limits the radius of detection of borehole TEM surveys. The ability to interpret borehole TEM surveys was improved significantly by lowering the base frequency of the transmitter in order to allow the host response to decay enough that the very conductive, constrained massive sulfide response could be better observed. Complex borehole TEM responses with multiple off-hole type responses became more conventional in nature and the off-hole response of the Eagle mineralization could be detected. Till thickness had previously been determined by drill hole intercepts and the resonant frequency of passive seismic noise. To extend the coverage of these values, frequency domain data from a Resolve survey was modeled using 1D inversion software over the entire exploration block. Once the till thickness was interpreted, the gravitational response of the till was computed and subtracted from the airborne and ground gravity surveys. This improved the interpretation of the gravity data.

The talk is presented by: Dick West, Technical Director, Exploration Technology & Group Resources, Lundin Mining Corporation.

Recorded on March 3, 2015, as part of the Geosoft Explorer Speaker Series presented at the PDAC.

Click here to view the video on the Geosoft web site (user registation required)

The video is presented here with Geosoft’s permission for which AIG expresses thanks.

The AIG Council meeting last weekend discussed conducting an Australian Geoscientist Census, ideally in conjunction with other Australian Geoscience Council member societies, to better understand our profession in Australia.

Is this a gap that needs to be addressed?

The last Australian census determined that there were 9,000 geoscientists in Australia at that time. There’s another census this year. The national census, however, doesn’t delve deeper into the qualifications, disciplines and fields of practice for Australians who identify as geoscientists, which would seem to be fundamental to an understanding of the geoscience profession and a good place to start.

Do you have any thoughts on where there are gaps in our understanding of Australian geoscientists that could assist in the development of questions to include in the census?  Contribute to the discussion with a comment here, via Facebook or via the AIG Linkedin Group.

The U.S. Securities and Exchange Commission (SEC) has announced a proposal to adopt CRIRSCO-compliant reporting standards for U.S. companies.

CRIRSCO (the Committee for Mineral Reserves International Reporting Standards) has been lobbying the U.S. Securities and Exchange Commission (SEC) to adopt CRIRSCO reporting standards for many years.  JORC is the model on which CRIRSCO standards has been based.  CRIRSCO reporting standards are currently in official use in Australia, Canada, South Africa, throughout Europe, Brazil, Chile, Russia, and Mongolia.

The SEC, to date, has permitted public reporting of ore reserves only by U.S. listed companies under Industry Guide 7.  In the SEC announcement, the Commission stated that the “proposed revisions are intended to provide investors with a more comprehensive understanding of a registrant’s mining properties, which should help them (investors) make more informed investment decisions”.  “The proposed revisions would also modernize the Commission’s disclosure requirements and policies for mining properties by aligning them with current industry and global regulatory practices and standards”.  SEC Guide 7 would be rescinded under the proposal.

The Society for Mining, Metallurgy and Exploration (SME) has had a CRIRSCO compliant code for Mineral Resource and Ore Reserve reporting in place for a number of years, but adherence to the code was not possible for public reporting due to SEC requirements.

This comes as U.S. mining companies have said their international competitors already report their potential reserves, which help investors to value a firm and have sought to fix this disadvantage.

U.S. National Mining Association spokesman Luke Popovich lauded the move for “recognizing this problem by aligning our material resource reporting with those of other mining regions.”

The proposal will also potentially benefit Australian and Canadian companies that are also listed on U.S. exchanges by simplifying their annual reporting requirements.

The SEC will also seek comment from the public on whether it should require companies to provide investors with a more-detailed discussion on how they are planning to manage greenhouse gas emissions and workforce health, safety and their well-being.

The SEC will seek comments for two months and will go through a vote on the measures ahead of implementation.


The AIG Council held its annual strategic planning meeting in Perth last weekend.  

The AIG Council usually meets every two months by teleconference.  The first Council meeting following the AGM is the one time that Council meets face to face to provide an effective means of dealing with important strategy and governance issues, as well as learning more about their colleagues who they will be working with remotely throughout the remainder of the year.

Executive Committee

Mike Erceg was unanimously appointed as AIG President for 2016-2017.  Mike is a Brisbane based consulting exploration geologist.

Wayne Spilsbury, past President, was appointed Vice President.  Andy Wilde will take on the role of AIG Secretary and Peter Lewis will continue as Treasurer.

Committee Chairs

Michael Edwards: Ethics and Standards
Anne Tomlinson: Membership
Sam Lees: Registration Board and Legal
Tim Craske: Complaints
Kaylene Camuti: Education
Andrew Waltho: Publications
Jonathan Bell: ROPO Board Representative
Wayne Spilsbury: Professional Issues
Mike Erceg: External Relations
Tim Pippett: AIG Service Award
Genna McDonough: National Graduate Committee
Heidi Pass: National Mentoring Programme Committee

AIG’s representatives on the JORC Committee are Chris Cairns, Jacqui Coombes, Graham Jeffress and Stuart Masters.

AIG’s VALMIN Committee Representatives are Jonathan Bell, Deborah Lord, Matthew Greentree and Jeames McKibben.