Building a geological model – Part 3 of 3

By Andrew Cantwell

Creating a first pass interpolant

This video continues on from part 2 of building a geological model in Leapfrog.

The process outlined in this video is simplified – the idea of this blog post is to give an understanding of the speed and ease of creating a first pass interpolant which can then be refined to give a more reasonable model.

You won’t hear any narration in this video but captions have been provided to explain the basic steps. If you’re after a more detailed description of the model building process then please contact your local support team.

We recommend you view this video in full screen mode. It may take approximately 30 seconds after you press play to switch to High Definition (given your internet connection allows it).

The main steps in this video include:

  • Viewing the assay data
  • Using some of the visualisation options to gain a basic understanding of the trend
  • Creating an interpolant model
  • Adjusting some basic parameters to get a more realistic model.

If you missed the previous videos in the model building series you can view Part 1 or Part 2 on this blog.

 

Further reading:
Case Study – can implicit modelling be used to model complex geology.

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New Zealand geology: a brief overview

By Sam Bain

When geologists visit the Leapfrog offices they often end up chatting with our geo’s about the spectacular geology that can be found here in New Zealand. We can usually recommend some interesting outcrops to visit when travelling our country. Today I thought I would try to give an overview of this geology. Given the tectonic complexity of this area, it will be a very simplified description but hopefully it will provide a starting point for those who are interested. In the long term I hope to look in more detail at some specific sites.

New Zealand is a section of Zealandia, a much larger submerged continental landmass. Zealandia extends a significant distance east into the Pacific Ocean and south towards Antarctica. It also extends towards Australia in the north-west. This submerged continent is dotted with topographic highs that sometimes form islands. Some of these, such as the main islands (North and South), Stewart Island, and the Chatham Islands, are settled. Other smaller islands are eco-sanctuaries with carefully controlled access.

The submerged landmass of Zealandia

The submerged landmass of Zealandia

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Building a geological model – Part 2 of 3

By Andrew Cantwell

This video continues on from part 1 of building a geological model in Leapfrog.

You won’t hear any narration in this video but captions have been provided to explain the basic steps. If you’re after a more detailed description of the model building process then please contact your local support team.

We recommend you view this video in full screen mode. It may take approximately 30 seconds after you press play to switch to High Definition (given your internet connection allows it)

The main steps in this video on building a geological model include:

  • How to create a new geological model
  • Creating depositional surfaces
  • Editing a surface using a polyline
  • Activating surfaces to produce volumes
  • Creating dykes
  • Editing interval selections
  • Adjusting the chronological order of the surfaces
  • Creating intrusions

If you missed part 1 you can view the post here

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Video: Importing and manipulating data – Building a geological model in Leapfrog Geo – Part 1 of 3

By Andrew Cantwell

This video provides a short and simple introduction to importing data into Leapfrog, as well as manipulating the data to make it easier to model. It is the first video in a series of 3 that will be posted on our blog over the next couple of weeks. The video provides captions to explain the basic steps but does not include any narration or detailed description of the entire model building process which is covered in Leapfrog Geo Fundamentals training.

The main steps in this video about importing and manipulating the data include:

  • Importing drillholes
  • Selecting columns for import
  • Fixing errors in the drilling
  • Importing the topography points
  • Creating a topography & adjusting the resolution
  • Simplifying the geology by creating a grouped column
  • Using the interval selection tool to select intervals which can be split up

Part 2 of this video series is available here

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Grade shells vs. mineralised zones

By Lisa Swinnard

There is more than one way to create a boundary surrounding a cut-off grade in Leapfrog; however the different techniques used to create these boundaries rely on different underlying concepts. Which tool to select will depend on the ultimate purpose for building the boundaries.

The typical way to create these boundaries is by building grade shells using the Interpolant tool in Leapfrog. Interpolated grade shells are built by using the known drillhole or point data to interpolate values infinitely across the boundary extents; isosurfaces (grade shells) are then created to link up identical values. Grade shells created by interpolation represent a “soft boundary”, as it is not possible to snap these isosurfaces (grade shells) to contact points on drillholes. Grade shells created using interpolation are ideal tools for exploration drillhole targeting.

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The risk of megathrust generated tsunamis

By Sam Bain

Natural disasters are often staggering in their scale, but few can compare to the shocking extent of damage and life loss resulting from the 2004 Indian Ocean and the 2011 Tohoku-Oki earthquakes and accompanying tsunamis.

We have all seen the horrifying images and videos from these events. The spread of mobile phones with reasonable quality cameras means that within hours of a disaster images begin to appear on the net. For me, there is one video in particular which captures the terrifying raw power unleashed by these disasters. It was captured from on top of a solid building and shows the rapid speed and destructiveness of the tsunami. It also clearly demonstrates the huge amount of displaced water that is involved.

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Making a scene – Leapfrog Saved Scene

By Sam Bain

Imagine you have built an amazing geological model. You have identified and fixed the problems in the core logging, you have reconciled the lithology labels used by the different historical surveys of the area, your geological surfaces are consistent with the data and make geological sense, your grade model has been built taking into account the geological structures and you are happy with its predictions. Is that your job done? No, of course not.

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Leapfrog Geo evolves with the release of 1.4

By Tim Schurr

The geological modelling workflow platform has evolved again, allowing you to model more geologies, in so many more ways. Earlier this month we released Leapfrog Geo 1.4, the third iteration of the software since its launch in February this year. The development group in New Zealand has been working full tilt at two key objectives; to extend the flexibility of Geo and to expand its capabilities with new workflows. The result is a new benchmark in usability and modelling workflows that delivers functionality that modelling geologists really need. So what’s new in version 1.4?

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Predictions at locations where there are no measurements

By Richard Lane

A key feature problem in geological modelling is how to take scattered measurements and use these to make predictions at locations where there are no measurements. The data may be measurements on the surface, or samples taken from drilling, or channel samples taken while excavating. Figure 1 shows the basic problem. Solving this problem is fundamental to how Leapfrog software works, and it underpins the geological and mineralization models that are produced.

Figure 1: A simple scattered data problem. Estimate the value at the red cross from the blue samples.

Figure 1: A simple scattered data problem. Estimate the value at the red cross from the blue samples.

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Interpolation and anisotropy

By Kirk Spragg

Introduction

In addition to interpolation, Leapfrog provides two tools that give the user control over the continuity of grade in their interpolants. These are the “Global Trend” and the more advanced “Structural Trend”.

The Global Trend can be effectively used to alter the results of an interpolant.  The Global Trend  is suitable to use in situations where the underlying geology implies that grade is continuous in a planar direction over large distances. If this is not the case, and the underlying geology implies that direction of grade continuity varies over space, then Leapfrog’s Structural Trend is a more appropriate tool to use when modelling your deposit or ore body.

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