In the first versions of the block model estimation software packages, the orientations of the search ellipses were held constant for each estimation domain. This approach worked reasonably well where the strike and dip of the mineralization were relatively constant within each estimation domain. The approach did not work well however where the strike and dip of the mineralization rapidly changed – a common occurrence in mineral deposits. Subsequent additions to the computer code has enabled the ability to change the orientations of the search ellipses for each estimated block in the model rather than by a grouping of blocks within an estimation domain. This approach is commonly referred to as Dynamic Anisotropy. While this new functionality permits a better estimation of the grades according to the local strike and dip of the mineralization, experience has shown that care must be taken when setting up to carry out a dynamic anisotropy estimate. My colleague Jack Lunnon and I have been fortunate to have our paper accepted and published recently in the CIM Journal. In this paper we share some of our experiences and the lessons learned when preparing grade estimates using the dynamic anisotropy approach. We also identify some of the more common pitfalls we see are encountered when using this method. The paper will be of interest to Mineral Resource practitioners and is available to CIM members at no charge at the link below. https://lnkd.in/gS9iwCwA Source : Reno Pressacco, LinkedIn