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Under review

Boundary analysis plots

Barbara Stefanini 8 years ago updated by ronald reid 7 years ago 5
Hallo support,
I would like to make a contact plot (or boundary plot) for analyses of border effects in different domains, namely oxidation, transitional and fresh rock, to try and see if these should be hard boundaries, soft or semi-soft.
I am wondering if you can suggest a protocol to implement in Micromine. I already assigned the distance to wireframe to my drillhole samples, and also assigned a code for samples plotting in the same interval distance from the wireframe (using the file/fields/generate). It should be simple to then calculate the weighted average Au for group of samples falling in the same bin. What function shall I use to accumulate and average by group of samples (after all these years using MM I should know I guess...but I cannot figure it how). Also, if does exist already a routine to calculate and then show contact plots, I would be happy to know. This is what I would like to make....best regards, Barbara
Image 725
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Hi Barbara,

You can do this easily by using the wireframe assign option (to flag the domains in question) and the distance to wireframes option to flag the distance and where it sits in relation to the contact. For example I have created a wireframe that defines the area of interest and flagged the composites to enable me to filter the composites to the required area - important for testing things like a lithology contact when part of the boundary is a thrusted contact (definitely Hard). I then fill the distance to WF form like;


This is the result of the above on screen (filter 113 above is the domain flag filter to constrain the points as per below);


I then export the flag filtered data to a csv file and then use excel and a method I actually developed for Leapfrog3D, however MicroMine flags the points in the same manner as Leapfrog Geo so I use the same workflow. You can obtain a copy of a presentation I did on this from the following link;

Pushing the Boundaries.pdf

If you skip all the how to's using leapfrog and go to the graphing slides I have the various equations there, both in the Leapfrog Mining and Leapfrog Geo sections. If you have any questions I would be happy to help. I hope the slides are self explanatory and you can pull out the information you require. Remember that Micromine is similar to the Leapfrog Geo workflow.

This is an example of the data above plotted up - using MM instead of Leapfrog, results are the same from either program and are vastly superior to any of the others (Isatis included).



You might be able to work a way to do it all in Micromine but I find going outside works.

Cheers

Ron
I have run into the same bin issues with generating swath plots.
I use field calculations to initially bin, for example 100m bins, I divide by 100, round then multiply by 100. The problem I run into is the fields accumulate function does only accumulation by key field and doesn't have the option to average by key field. The easiest way to average bins for me is MS Access and graph it in Excel.
Under review
Geoff,

I keep meaning to write a book about the 1001 uses for the Drillhole | Calculations | Extraction function.  Here is another example.  Set the Bin number as the Constant field and use 'Average' as the Extraction type.  The Output file should have the result you want.

Cheers

Paul
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As an update to this I have a workflow published in the attached blog specific to Micromine

http://www.orefind.com/blog/orefind_blog/2015/05/11/boundary-analysis-in-micromine

You can run the whole boundary analysis start to finish in Micromine and get some impressive results that leave the likes of Isatis, Vulcan etc for dead.