Delineating "join line" when combining terrain layers

Hi There - first post on this forum, so here goes...

I frequently combine terrain layers (elevation grids) e.g. a proposed mine pit shell and existing topography, or a proposed waste rock dump and existing topography to create a post-development model and I find this to be a really useful tool within GM.

However, I also often need to delineate the "join" or "merge" line with a vector line or shape e.g. if the pit shell design projects above topo or the waste rock dump design projects below topo I need to delineate the join or merge line to create either a pit crest or a dump toe-line. To date I've been doing this manually which is tedious and introduces inaccuracies. Does anybody know how to do this in GM?



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