Surface creation in GEMS using Drillhole Collars

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Creating a surface from drillhole collars is an alternative method of creating a surface if the survey points are not available to create the surface. The surface can then be used to define the roof (hanging wall) and floor (footwall) of stratified deposits, calculate the overburden thickness, stripping ratio, safety factor, direction that the water will flow (towards or away the pit) and the best area to locate the mine infrastructure and roads.

Today’s post is to help our GEOVIA GEMS users, particularly geologists, create surfaces using drillhole collars.

  1. In GEMS, open the Drillhole workspace which you would like to create the surface from; the drillholes should be displayed in the window.|

  2. Go to Drillhole > Select > Select All Drilhole Intercepts. A red cross will show on the collar of each drillhole to illustrate that it has been selected, such as in the image below.

  3. Go to Surface > Create > Create Surface From Active Data, the window below will pop-up. Click OK.


    Selecting “delete any long triangle along the outer edge of the surface” will reduce the number of long triangles involved in creating the surface, which will yield a smoother surface.

  4. In the Triangulation Properties window that pops up, you can name your surface and ensure that it is saved in the correct workspace. Also, ensure that category of your surface is changed to Topographic surface as illustrated below:

  5. After clicking OK, the surface will be created as below.

For more GEMS tips, read:

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When mining companies seek to increase mine productivity, they turn to Dassault Systèmes for technology and services. It is home to world-renowned and award-winning mining solutions and to industry thought leaders who are pushing the boundaries of what’s possible in mining, through the GEOVIA brand. The largest global supplier of mining software, GEOVIA delivers comprehensive solutions in all major mining centers in more than 130 countries at over 4,000 sites.
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