Symptom:
An issue has been introduced and identified in Leapfrog Edge 2021.1 that affects the evaluation of Combined Estimators on the new Octree block model .
When combined estimators are evaluated onto the Parent Blocks of an Octree model, the domain filter is incorrectly applied, meaning that the domain flagging and grade estimation for the combined estimator is incorrect. Visualising the domain (DOM) or the grade estimates will reveal that these are incorrect for lower priority domains.
Solution:
This issue has been addressed with the release of 2021.1.2.
- Navigate to https://my.seequent.com/products
- Download and install 2021.1.2.
NOTE:
It is highly recommended that you upgrade to 2021.1.2, but if updating isn't an option there is a workaround in 2021.1.
In 2021.1, for Octree models, please do not evaluate combined estimators on to parent blocks centroids.
The work-around is to instead evaluate combined estimators onto Sub-block centroids. The only drawback is that this will be slower as there are more centroids to evaluate.
We recognise that there are differing opinions about the geostatistical validity of estimating onto sub-blocks.
Please note that the Leapfrog implementation of sub-block estimation takes account of the issue of volumetric support. The discretisation grid appropriate to parent block support is relocated onto each sub-block in turn, meaning that the issue of unrealistic selectivity is not present. The approach is geostatistically well supported and sound,
If you need further information about the impact of this issue on your Block Model or resource estimations, feel free to reach out to your Regional Technical Team or to Mike Stewart (Mike.Stewart@seequent.com) who can provide further technical information more specific to your individual circumstances.