Posts Tagged Geosoft

Fresh insights on magnetic field from Geosoft

Posted by on Friday, 20 February, 2015



Virginia Heffernan: “Magnetization Vector Inversion (MVI) is a modern technique which is gaining acceptance as an effective tool for subsurface exploration in areas where magnetization does not necessarily run parallel to the earth’s magnetic field, a more common scenario than geoscientists have traditionally appreciated.”

– See more at: Earth Explorer


Supervised Neural Network Targeting and Classification Analysis for Mineral Exploration

Posted by on Tuesday, 29 April, 2014

Karl Kwan (Geotech LTD) presented at Canadian Exploration Geophysical Society meeting (8 April 2014) methodology and examples of using Neural Network Targeting and Classification at mineral exploration.

“Geophysical survey contractors routinely offer multi-parameter data to clients. For example, a helicopter-borne survey may acquire Time-domain electromagnetic (TDEM), magnetic gradiometer and even gamma-ray spectrometer data (i.e., VTEMplus, Geotech LTD). Exploration geophysicists can certainly take advantage some of the readily available multi-disciplinary (geology, geophysics and remote sensing) and multi-parameter (potential field, EM, gamma-ray spectrometry, and others) datasets for mineral exploration. However, the integration and interpretation of these datasets can be time-consuming and even challenging, especially for large-scale datasets covering large areas with diverse geological conditions. The Supervised Neural Network (NN) Targeting and Classification technique for mineral exploration described and demonstrated by Reford, Lipton and Ugalde, 2004, “Predictive Ore Deposit Targeting Using Neural Network Analysis” (, can be a useful and promising tool for the analysis of multi-disciplinary and multi-parameter data.

In this presentation, the properties or responses of the two feed-forward multilayer Neural Networks, Levenberg-Marquardt (NN with LM training) and Fast Classification (FCNN), as implemented in the current version by PGW, are studied in detail. The supervised NN simulations are performed on specially constructed synthetic data. Intended as a tutorial and the NNs treated as black boxes, the objectives of the exercise are twofold, to demonstrate the targeting as well as classification capabilities of the Neural Networks, and at the same time to show one of the known limitations and to suggest a way to get around it. The utility of the NN tool is demonstrated again with real cases from the Republic of Niger.”

Geosoft is delighted to host the online portion of the Canadian Exploration Geophysical Society meeting with keynote speaker Karl Kwan, Geotech LTD.


Rio Tinto: “Geophysics playing an increasingly important role”

Posted by on Tuesday, 17 December, 2013



“Despite a steep appreciation in exploration spending over the past decade, the number of greenfield discoveries is falling every year. Narrowing this gap will require harnessing the power of big data and cloud computing, according to a presentation by Rio Tinto’s exploration chief Stephen McIntosh at the International Geophysical Conference in Melbourne.

“In a lot of cases, we have the data but we haven’t got the most out of it because of time constraints and our ability to find or “discover” this data,” Amanda Butt, McIntosh’s colleague and former manager of exploration and geophysics, said in a follow-up interview with Earth Explorer. “Now that we can do things more quickly, and efficiently we can get more effective information out of the data.”

Geophysics, in particular, has become an increasingly important exploration tool as the depth of the average discovery moves from close to surface in the 1950s to hundreds of metres deep. Indeed, geophysics contributed significantly to nine of the 16 greenfields discoveries Rio Tinto has made since 1996, including the Diavik diamond mine in Canada and more recently at the La Granja copper project in Peru.”

the original story

VOXI: The New Generation of 3D Mining Software

Posted by on Friday, 24 August, 2012

Geosoft VOXI Earth Modelling is among the 3D technologies cited in the Engineering and Mining Journal (E&MJ) article, New Generation of 3-D Mining Software Sets the Scene. The article looks at different technologies, 3D display systems, high-performance cloud computing and robust data management tools, that are contributing to greater understanding of what lies beneath the surface in exploration and mining.”

Read the full article in the Engineering & Mining Journal.

VOXI (Advanced 3D geophysical modelling) is a new geophysical software service that generates 3D voxel models from airborne or ground gravity and magnetic data. VOXI Earth Modelling is accessed through the Oasis montaj software and uses the power of cloud computing to rapidly create 3D models of large exploration datasets.

“Detecting vanadium and graphite deposits with EM methods”

Posted by on Monday, 23 July, 2012


“The recent rush to find graphite and vanadium deposits to satisfy potential demand in green energy applications is reigniting airborne electromagnetic (EM) methods as highly effective exploration tools.”

read more..

VOXI: Presentation.

Posted by on Thursday, 19 July, 2012

The Geosoft VOXI development story

Posted by on Wednesday, 30 May, 2012

Released in April, 2012, Geosoft’s VOXI Earth Modelling service gives exploration geophysicists the ability to convert magnetic and gravity data directly into useful 3D Earth models that can be integrated with other 3D exploration data.

Read more:

Geosoft 2012 update

Posted by on Friday, 4 May, 2012

The Geosoft 2012 Software Release includes updates to Oasis montaj, Target, Target for ArcGIS and GM-SYS Modelling software. New capabilities and workflow improvements help save time and provide greater flexibility when visualizing multidisciplinary geoscience data in 2D and 3D.

Improved 2D to 3D workflows in Target for ArcGIS: The 2D to 3D workflow enhancements, include new display capabilities, and new section import and export options. Layers, such as interpretation layers from sections or plans can now be easily displayed in their correct geospatial orientation within your 3D view. 2D section interpretations can be exported to a 3D georeferenced file, such as shapefiles or DXF files, to be shared with other 3D applications. 3D vector files, such as open pit outlines, and wire frames can now be easily imported to multiple section and plan maps.

3D Viewer improvements: Geosoft 3D gridding methods have been expanded to include IDW and direct gridding; these new methods better support the 3D gridding of a broad range of data types. Angled clipping of objects in 3D views provides the ability to clip parallel or perpendicular to dataset orientation or geological strike. Geoscientists can set a clipping plane that aligns with any direction chosen.

Expanded GM-SYS 3D density model support: Voxels can be used to define the 3D density variation within GM-SYS 3D model layers. This provides more direct integration with 3D seismic data as the generated density cubes may be used directly in the GM-SYS model.

Geosoft has released VOXI Earth Modelling, a cloud-based geophysical inversion software service that generates 3D voxel models from airborne or ground gravity and magnetic data. VOXI is available as part of the Geosoft 2012 Software Release.

Over the past decade, 3D geophysical modelling has become increasingly important to exploration around the world. The ability to convert geophysical measurements directly into 3D images of subsurface rock properties that can be integrated with other exploration information in three dimensions enables resource explorers to extract significantly more insight from geophysical data.

“One of the important benefits of converting gravity or magnetic data into a 3D earth model is that the visual end product allows explorers to see and understand the subsurface using now common 3D viewing platforms,“ said Ian MacLeod, Geosoft Chief Technologist. “VOXI produces a model of rock properties, which can be directly integrated with other surface and subsurface geologic observations. ”

Integration is important, says MacLeod, because no one technique provides all the answers. “Geophysical models often need to be constrained by geological and geochemical observations in three dimensions. Our aim as explorers is to develop the most complete subsurface picture of geology and mineral systems that we can.”

Geosoft experts and industry collaborators have presented on the topic of 3D modelling at a number of global conferences. Here are some highlights:

SBGf Forum paper on Non-Uniqueness in Potential Field Inversion With Application to the Potiguar Basin: by Robert Ellis
ASEG technical paper on Inversion of Magnetic Data from Remanent and Induced Sources: by Robert Ellis, Barry de Wet and Ian Macleod
EAGE presentation on 3D Gravity and Magnetic Model of a Triassic Large Igneous Province Vent in Central Alaska Range, Alaska: by Gerry Connard.
PDAC presentation on VOXI: A cloud approach to Earth Modelling: by Ian Macleod.

In the Community: Geosoft sponsorship supports CET geophysical image analysis research

Geosoft recently announced a Knowledge from Data© Sponsorship to support continuing collaboration between Geosoft and Australia-based Centre for Exploration Targeting (CET). This support will facilitate relevant image analysis research through short-term CET student projects and communication between CET academics and Geosoft.

“Geosoft’s collaboration with the Centre for Exploration Targeting has grown over the years, and we’re pleased to support CET research initiatives through sponsorship,” said Darin Bryce, Managing Director, Geosoft Australia. “We look forward to contributing to applied research and technology outcomes that progress our shared goal of improving the success of exploration targeting.”

The CET’s Geophysics and Image Analysis research initiatives are aimed at making significant and valued contributions to improve efficiency, accuracy and consistency in the use of data for the mining and exploration industry and other geoscientific communities.  The objective is to maximize human intuition and minimize human biases in geoscientific data analysis though computer aided interpretation and computer field technology.

VOXI Earth Modelling technology

Posted by on Saturday, 10 March, 2012

Geosoft introduced VOXI Earth Modelling, a geophysical inversion software service that generates 3D voxel models from airborne or ground gravity and magnetic data, at thePDAC 2012. Ian MacLeod, Geosoft Chief Technologist, also presented a talk entitled VOXI – A Cloud Approach to Earth Modelling for Exploration during the Geophysical Technical Session at the PDAC.

“One of the important benefits of converting gravity or magnetic data into a 3D earth model is that the visual end product allows explorers to see and understand the subsurface using now common 3D viewing platforms.“ said MacLeod. “VOXI produces a model of rock properties, which can be directly integrated with other surface and subsurface geologic observations.”

Integration is important, says MacLeod, because no one technique provides all the answers. “Geophysical models often need to be constrained by geological and geochemical observations in three dimensions. Our aim as explorers is to develop the most complete subsurface picture of geology and mineral systems that we can.”

The technique of modelling the earth through inversion has been used successfully within mineral exploration industry for well over a decade, and the benefits have been well documented.  The ability to convert geophysical measurements directly into 3D images of the subsurface that can be integrated with other exploration information in three dimensions has enabled resource explorers to extract significantly more insight from their geophysical data. Insights generated from these 3D earth models have helped mineral explorers to sharpen their prospecting and improve their drill targeting, particularly in challenging subsurface environments.




Details about an Airborne Survey in the Yukon

Posted by on Monday, 30 January, 2012

Airborne geophysics in combination with geochemistry is helping to unveil more deposits in the Yukon’s White Gold district.

By Virginia Heffernan

in Earth Explorer Magazine

Non-Uniqueness in Potential Field Inversion

Posted by on Tuesday, 11 October, 2011

Non-Uniqueness in Potential Field Inversion with application to the Potiguar Basin
Dr. Ash Johnson

October 10 – 13, 2011
China University of Geosciences, Beijing

Geosoft’s Dr. Ash Johnson has been invited to present his talk, The Non-Uniqueness in Potential Field Inversion with application to the Potiguar Basin during the GEM Beijing 2011 conference. Dr. Johnson’s presentation will focus on a basic unconstrained inversion of FTG and TMI data over Block 5 in the Potiguar Basin in north eastern Brazil and compare the results with known geology.

Geosoft is also pleased to sponsor the GEM Beijing 2011 International Workshop on Gravity, Electrical and Magentic Methods Dinner on Wednesday October 12th.

Geosoft: Gravity and magnetic methods for oil exploration

Posted by on Saturday, 13 August, 2011

“Discovering and assessing oil or gas deposits requires integration of information culled from geology, geochemistry, drilling, GIS, seismology, EM, potential fields, and other disciplines.

While seismic exploration remains the primary method of exploring for petroleum, use of gravity and magnetic methods has continued to expand, based on their contribution to reliable evaluations (and recent discoveries) in deeper, more challenging environments such as sub-salt structures and deep sea.”

Advances in processing and interpreting gravity and magnetics

Applying gravity and magnetics in deepwater exploration

Effective use of gravity and magnetic data for oil exploration

The new Earth Explorer Issue

Posted by on Monday, 15 November, 2010

Earth Explorer Magazine :: Issue #2, 2010 Now Available.

Optimizing Geophysical Data Management
Barrick Gold geophysicist Jared Townsend describes the Geophysical Exploration Information Management solution they’ve adopted at their Elko office for sharing geophysical exploration data and knowledge, locally and globally.

Modelling the Earth with Inversion
In our latest explorer interview, Ian MacLeod, Geosoft Chief Technologist, discusses the application and benefit of 3D inversion modelling methods for Mineral and Oil exploration.

Rapid Reversal in the Earth’s Magnetic Field
Researchers Jonathan Glen and Scott Bogue report on their discovery of rapid transitional field change (RTFC) in Nevada’s Sheep Creek Range.

Geophysicists and Geologists Working Together:
Are we There Yet?
Louis Racic, Product Director with Geosoft recalls the silo days of working as a geophysicist in exploration, and considers how mindsets, as well as software, have changed to support more teamwork.

Extensive 250 km Iron-T Mag Survey Underway

Posted by on Sunday, 31 October, 2010

Apella Resources Inc.  announces  that the company granted Abitibi Geophysics Inc. from Val d’Or, Quebec, a contract to conduct an extensive 250 line km Magnetic-GPS survey on Apella’s Iron-T Vanadium-Iron-Titanium project near Matagami, Quebec.

From the positive drill results obtained to date coupled with data from earlier airborne surveys covering the western part on the Iron-T Project the company has concluded that the rich mineralization discovered to date extends over the entire western extension of the Iron-T. Based on these conclusions, the rich mineralization identified to date would extend over a multi-kilometer strike length and be open in all directions and at depth.

The magnetic survey now underway will comprise about 250 km of transversal lines, base lines and tie lines and is planned to cover the entire western part of the property from Shallow Lake to the Bell River. This represents about 50% of the total area of the Iron-T Project. The central part of the Iron-T which was the subject of the 2009-2010 exploration drilling campaigns, as well as the eastern part, have been surveyed by Apella over the years from 2007 (17 original claims) to March 2010.

Once this new survey will be completed, the entire Iron-T project which currently consists of 146 claims totaling 3,995.57 hectares will have been covered by a ground magnetic survey.

Results of the new magnetic survey will be available to Apella at the beginning of December 2010 and will provide considerable abundance of drill targets which will confirm the size of this World-Class magmatic Fe-Ti-V oxide deposit.

In the past, the Iron-T area was covered by a regional airborne magnetic and electromagnetic INPUT MK VI survey which was conducted in 1977 (Questor Surveys Ltd. ?). Regional magnetic data over the Iron-T project from that airborne survey were acquired at a nominal lines spacing of 200 metres and a nominal mean terrain clearance of 125 metres. In addition, the western half of the Iron-T Vanadium-Titanium-Iron property, now being ground surveyed by Apella was covered by a regional airborne gradiometric survey which was carried out in 1984. Magnetic data in that survey was acquired at a nominal lines spacing of 300 metres and a nominal mean terrain clearance of 150 metres. The two airborne magnetic surveys outlined a broad magnetic anomaly up to 4 000 nT above the background level which is continuous over some 25 km in a WNW direction.

To date, the ground magnetic surveys undertaken by Apella have shown a direct relationship with the Iron-Titanium and Vanadium mineralization discovered. They have also provided more precise locationing of the anomalies and more accurate shapes of the targets.

The current ground magnetic survey will be carried over lines at a 100 spacing with readings every 2 seconds. The diurnal corrections are made with a synchronized Mag base station. Observation of the Total Magnetic Field (TMF) will be recorded and treated with Geosoft software. The Vertical Gradient will be calculated from the TMF.

The survey under progress is planned to confirm the lengths and widths of the airborne anomalies. It will also cover a 3 km long NW oriented magnetic axis which starts near the southwest shore of Shallow Lake and which seems to joins the main magnetic axis. This magnetic “South Branch” is about 3 km long and has never been drill tested.

The Iron-T Vanadium-Titanium-Iron property is located in the Matagami area in the west-central part of the Province of Quebec, Canada, approximately 780 km north of Montreal.

Oasis Montaj 7.2.1 upgrade

Posted by on Tuesday, 21 September, 2010

The upgrade includes software improvements, workflow efficiencies and corrects numerous reported issues.

There are Enhancements and bug fixes for the next geophysics applications: GM-SYS, GM-SYS 3D, Depth to Basement, Euler,  IP, MagMap, QC, UX Detect.

Rio de Janeiro, September 20-23, 2010

Posted by on Thursday, 12 August, 2010

The Brazilian Geophysical Society (SBGf) is organizing in 2010 a Forum to focus discussions on the application of non-seismic methods for Oil and Gas Exploration.

Modern geophysics was born with non-seismic methods when Conrad Schlumberger conceived the revolutionary idea of using electrical measurements to map subsurface rock bodies in 1912.

After almost a century the non-seismic methods are still revolutionary on the geophysical world bringing new ideas and methods for the exploration of natural resources.

Present days, the oil industry emphasizes the use of geophysical techniques because of their minimum impact to the environment. By having in mind that the large reservoirs are hard to discover and expensive to develop the industry is searching for new technologies which are able to provide valuable information for the exploration and production of these areas in an efficient and more cost-effective way. We hope to have examples from offshore and onshore applications of the non-seismic methods from South America, Gulf of Mexico, North Sea, Middle East, Russia and other important oil producers worldwide.

The Organizing Committee expects to receive 150 delegates from Brazil and abroad. Participants will include geophysicists and exploration specialists within the oil and gas industry.

The forum provides an opportunity to explore the application of non-seismic methods and areas where they’ve proven to be successful in oil and gas exploration. Forum organizers have invited geoscientists to share their ideas and experiences by submitting presentations on the topics of Potential Fields Methods, Electric and Electromagnetic Methods and Borehole Geophysics.

While no oil and gas discoveries are made without the use of seismic methods, other geophysical methods can contribute to more reliable evaluations in deeper, more challenging environments, such as subsalt structures and deep sea environments. By cost-effectively gathering geophysical data to narrow the search area within large fields, oil and gas explorers can refine their targets and apply seismic techniques more productively.

Geosoft Among Participants of SBGf Forum on Non-Seismic Methods

“The SBGf chose to focus on non-seismic methods for its 2010 forum because of increasing interest and success in the use of other geophysical methods within oil exploration,” says Ana Cristina Chaves, Managing Director, Geosoft Latinoamerica, and a member of the SBGf forum organizing committee. “In recent years, potential field geophysics has played a role in significant discoveries in the subsalt structures of offshore Brazil and the Gulf of Mexico. With deeper exploration, there are also greater environmental concerns and geophysical techniques that have less impact on the environment are favoured over more invasive methods. As a result, we’ve seen major oil and gas companies expanding or starting new gravity and magnetic programs.”

“The degree of complexity within Oil and Gas exploration today is driving a resurgence of gravity and magnetic methods,” said Jorge Hildenbrand, Managing Director of Fugro Airborne Surveys in Brazil and a member of the SBGf committee organizing the forum. “There are many environments where seismic does not respond well, such as salt domes and volcanic horizons, and geophysical potential field data, properly modeled, reduces the uncertainty caused by non-homogeneous lithologies. Potential field methods, including airborne gravity gradiometry, and the application of electromagnetic methods (both marine and ground) are showing a lot of promise, and the forum will provide an opportunity to share case studies on how they are being applied in the field.”

Robert Ellis, Geosoft Senior Scientist, Earth Modelling, will present a paper on Non-Uniqueness in Potential Field Data with application to the Bacia Portiguar at the forum. Exploration relies heavily on using geophysical observations to aid in building a model of the Earth’s subsurface, and Ellis will explore how this is achieved by solving a geophysical inverse problem that recovers a causative physical property model from its geophysical response.

The new CET grid analysis software for geophysical data

Posted by on Saturday, 31 July, 2010

A joint project of the University of Western Australia (UWA) and Geosoft, supported by Barrick Gold, has created new CET grid analysis software which can help explorers improve their interpretations.

“The most relevant application to date has been on airborne gravity data in the Lake Victoria Goldfields to assist in mapping dislocations and gradient changes commonly associated with greenstone gold deposits,” said Matthew Hope, Barrick’s project geophysicist for Africa/Eurasia.
It is the identification and mapping of these features that makes the new CET grid analysis tool so useful to explorers. The modules are essentially automatic interpretation tools that provide a first pass lineament detection on gridded/image data.

The clever and sophisticated algorithms behind these tools were created by the Geophysics and Image Analysis Group of The University of Western Australia (UWA)’s Centre for Exploration Targeting (CET), part of the University’s School of Earth and Environment. The group is supported through a partnership between UWA, Curtin University of Technology and the mineral exploration industry. Since 2006, the team has been focusing on developing new techniques to enhance and automatically detect features of interest from geoscientific datasets.
While the UWA team are clearly the mathematical theorists behind the initiative, creation of the new modules was a joint effort with partners Barrick and Geosoft.

In the CET group at UWA, Associate Professor Eun-Jung Holden teamed up with Professor Mike Dentith and Dr Peter Kovesi to develop the methodology used for the software. In 2009 when the project hit its stride, Holden coordinated and led the team, assisted by research associate Shih Ching Fu, to develop the software.
Holden explained the outcome and the three basics of what the mathematical processes do:
“The algorithms provide methods to enhance local discontinuities within data by analysing local textures; to locate laterally continuous regions of discontinuity by finding texturally complex line features or finding data edges; and to vectorise the axes of resulting discontinuity regions,” she said.
Holden said the base algorithms are well-established methods in the computer vision community, some of which had been developed by team member Dr Peter Kovesi.
“These algorithms are combined and adapted for geophysical processing in CET grid analysis,” she said.
The software provides generic tools that are broadly applicable. Barrick’s Bourne believes the new software will find use in most exploration situations with potential field or other image analysis requirements.
“It is not a standalone tool but a supplement to traditional image outputs,” he said.
“The efficiency of the CET grid analysis tools is one of its major strengths. From a user perspective the code is relatively easy to understand and quick to run. Several iterations can be achieved in short periods of time on most potential field datasets.”
UWA’s Holden says the new processes have only become possible more recently.
“A main challenge in developing geophysical image processing tools is in dealing with the size and scale of the data while preserving a reasonable execution time,” she said.
“Often geophysical datasets are larger than datasets used in other fields, and clients do not have access to high powered hardware.”

How the new algorithms work their magic
The CET Grid Analysis software provides tools for grid texture analysis, lineament detection, edge detection, and thresholding to coax out trends from geophysics datasets and facilitates the following:
1. Texture analysis-based image enhancement: by highlighting local intensity variations, this method enhances regions of discontinuity within aeromagnetic/gravity datasets. Regions of magnetic/gravity discontinuity correspond with, and can reveal, lithological boundaries, faults and dykes critical to understanding an area’s geology.
2. Discontinuity structure detection: takes the texture analysis output and finds the skeletal structure of the regions of the magnetic/gravity discontinuity. The output is a set of a binary skeletal line segments that belong to each of the discontinuity regions, clearly showing the changes of orientations and offsets within the structures. This process emulates the traditional manual drawing of interpretive lines along the discontinuity region.
The algorithms will be useful in exploring for most kinds of mineral deposits, in particular gold and base metal mineralization.

Paula Wallace — created Jul 14, 2010

Australian Journal of Mining