Micromine Variogram Modelling 2

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Creating a Mined Geology Model in Leapfrog Geo I was asked the other day – can you filter the model for the mined / unmined material in Leapfrog. This got me thinking – the answer is yes but doing it once and only once is a lot of work to get a single result. If we flag a model as mined/unmined today, then tomorrow the result is wrong as we have mined some more. So I asked myself “Is there a way to create a mined model that is easily updated?” It has been a while since I did a ‘how to’ post so I figured this might be a good topic to cover. In Leapfrog Geo the terminology of the geology modelling process and workflow can easily impose a straitjacket on your thinking – create a geology model using erosion, deposition and intrusion surfaces. What you are in fact creating is a domain model using cutting, covering and slicing surfaces. Remove the geology straitjacket and you will see the domaining process can be used for anything. In this case we can use the cutting (erosion) and ...
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Rotation Madness and estimation screw-ups

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What is it with rotation conventions and mining software providers? Every company seems to want to use a unique, individual method of defining the rotation and then  provide a set of instructions guaranteed to confuse anyone who attempts to read them. I might not be the sharpest tool in the shed and I like to think I am not stupid but working out what rotation has been used to estimate a resource sometimes does my head in. If you use Surpac, and if someone gives you a model  estimated using Vulcan the rotations discussed in the paperwork (assuming the author got it correct in the first place) are different. But it is different again in Datamine where it seems you simply make it up as you go along! I reviewed a model done using Datamine where every domain used a different rotation convention (Dom1 = 3:2:1, Dom 2 = 3:1:3, Dom 3 = 3:1:2). And when I tried to create a search ellipse to match these rotations I simply could not get one to match the smoothing trend I could see i...
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