Tag: Leapfrog Geo

Modifying intrusion surfaces – effect of value clipping on intrusions (part 1/2)

By Lisa Swinnard

There are several ways to edit and modify an “Intrusion” surface within a GM; of them, value clipping is often overlooked. This document is part one of two and will outline the procedure for modifying intrusion surfaces by value clipping, describe the importance and relevance of volume points, and explain how the two are connected.

1. Modifying intrusion surfaces by Value Clipping

Step 1 – Create a new geological model and intrusion surface

  • Within the GM, create a new intrusion surface.
  • Edit the surface accordingly, add a trend if necessary.

Step 2  – Modify the value clipping

  • To modify the value clipping, double click the intrusion surface in the project tree.
  • In the dialogue box that appears, click on the surfacing tab and check the “Show additional surfacing options” box.

Value clipping. Dialogue box. Surfacing tab. Leapfrog 3D.

Continue reading

Drillhole planning in Leapfrog Geo

By Andrew Cantwell

One of the major costs of an exploration project is the drilling program. Planning drillholes in 3D based on existing knowledge is an easy way to maximise the value of any future drilling, and can be achieved quickly and easily in Leapfrog Geo. This blog post will take you through the steps required to plan a drilling campaign in Leapfrog Geo, then set up a scene file so the field team can see where each drillhole should be going, as well as what lithology and grade it is expected to intercept, in 3D.

  • The first step is to define your project area – a good start is to import any existing data. This could include a topography surface, any existing drillholes, an aerial photograph or geological map, and GIS data such as lakes, rivers, access roads and tenement boundaries.
  • Once you have imported the existing data, you’ll be able to start visualising in 3D where an appropriate location is to place your collar. If you’ve created any geological or grade models, you can also visualise where your potential target is.
  • To create a planned drillhole, right click on the ‘Planned Drillholes’ folder, and click ‘Plan Drillhole’.
  • There are two options you can choose; you can either specify a collar location or a target location. We’ll specify a collar location as it is more common to have a known point on the topography to place your collar.

Example 1.

Continue reading

Leapfrog’s structural trend

By Peter Joynt

It is not often in geology that mineralisation or geological units behave in a consistent planar fashion. The earlier article on interpolation and anisotropy by Kirk Spragg outlined a detailed explanation of Leapfrog’s global trend and how it affects the interpolation of points. This article aims to give users an introduction to the application of structural trends and how they can be applied to a model to handle different situations.

What is a Structural Trend?

A structural trend is a generalisation of the global trend that allows changes in direction of continuity over a defined surface. Instead of being based on a plane like the global trend with the user defining the ellipsoid ratios, the structural trend is based on a surface. This surface can be any shape or orientation usually defined by geological constraints such as faulting, foliation etc. The surface is then effectively down sampled to determine the local trend at each point on the mesh to give the user an anisotropy that varies throughout the defined space. This makes the structural trend perfect for geological units or mineralisation that is not planar. The structural trend does not determine the final surface; this is still done by the interpolant and the data points used. In Leapfrog the default interpolant type is isotropic, which lets us more easily visualise trends that are often hard to pick up when looking at raw data. Figures 1, 2 and 3 show the difference between an isotropic interpolant, global trend and a structural trend.

Isotropic interpolant modeled in Leapgfrog software.

Figure 1: Isotropic interpolant

Continue reading

New Zealand: the shaky isles

By Sam Bain

New Zealand has a lot of earthquakes. Many of you will have heard of the recent deadly Christchurch earthquake sequence. Some of you may know about the relatively large earthquake sequence that occurred near Seddon, a small town to the south of Wellington, New Zealand’s capital, in 2013. Perhaps those strange types out there with a passion for seismology might have noticed the relatively common occurrence of medium to large earthquakes near New Zealand on the USGS earthquake map. They might not realise that in a typical month New Zealand experiences approx. 3000 earthquakes (I am cheating a bit here as around one third of these are too small to be felt). On average, New Zealanders felt 414 earthquakes larger than magnitude 4 each year from 1960 to 2011.

New Zealand Earthquake Map

Map showing earthquakes throughout New Zealand over the last year. The categorisation by colour refers to the intensity of the shaking experienced from the earthquakes. The shaking intensity is largely controlled by the earthquake magnitude and location relative to the person being shaken (especially depth). For clarity, the huge number of weak earthquakes have not been shown. Image from GNS Science Geonet website .

Continue reading

Getting a handle on complex geology

By Desmond Subramani

South Deep Mine has some complex geology, it is located near Westonaria, around 50km from Johannesburg, South Africa. The mine is regarded as a “flagship ore reserve”, but it hasn’t always been that way. Historical complications and the complex nature of the location has meant years of work to understand the geology. Leapfrog Geo has been an important aspect in improving the geological models within the mine’s geological team. This post highlights some of the challenges and how Leapfrog Geo proved to be a useful solution.

The Geologists of South Deep and leapfrog gathered outside the offices at South Deep’s Twin Shaft.

The Geologists of South Deep and leapfrog gathered outside the offices at South Deep’s Twin Shaft.

Continue reading

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?

Continue reading

Interpolant function in Leapfrog Geo

By Tim McLennan

Choosing an interpolant function

Leapfrog Geo uses two different base functions to form interpolants. They are the linear interpolant function and the spheroidal interpolant function. This blog covers when to use each base function, how to set the function parameters, and how to convert the parameters for a Leapfrog Mining interpolant across to Leapfrog Geo.

As explained in the Leapfrog Interpolation Basics blog article, the interpolant functions indicate how the function values are expected to vary as the distance between points increases. At small distances the values are expected to be similar and so the function values are small. At large distances the values are expected to vary considerably and so the function values are larger.   The nature of this relationship means that the interpolant function is equivalent to the variogram used in geostatistical modelling.

Continue reading

What is happening with Mining and Geo

By Richard Lane

Leapfrog Geo was introduced in response to a number of requests from users to have a tool that could be integrated more easily in a standard work environment and manage the level of complexity they were encountering in their models. This led to a new interface that helped organise the models in Leapfrog Geo in a more structured way.

We now have received a considerable amount of feedback on how Leapfrog Geo compares to Leapfrog Mining. It has been very informative from our perspective because it has clearly illustrated the very wide variety of uses and tasks that Leapfrog Mining has been used for.

The principal difference between the two products is that Leapfrog Mining is a toolbox, which contains a significant number of powerful tools. Leapfrog Geo is designed to do certain workflows and it does these very efficiently. For users whose principal tasks are these workflows it is the obvious choice, and a significant number of users have indicated their preference by switching to Leapfrog Geo.

Continue reading