Draw Heave Zones

This command creates closed polylines that represent the fault heave zones where the material is broken up and not mineable. These polylines can then be used as exclusion areas in routine like Strata Isopach maps to avoid contours in those areas. They can also be tagged as Strata Limit Polylines for exclusion for volumes and to delete the area in a Fence Diagram.

The command will use either an existing elevation grid file, or it will model from drillholes on screen. If there are multiple seams that are faulted, each one will have a slightly different area along the fault. Shown here is a result of drawing the heave zones. Most zones will run parallel to the faults, with the distance away from the fault based on the displacement of shift of the fault.

Prompts

Here are the prompts when using the drillholes.
Command: draw_heave_zones
Select fault polylines to process:
Select objects: Specify opposite corner: 9 found
Select drillholes, channel samples and strata polylines.
Select objects: all
101 found
Reading drillhole 101
Select the strata limit polylines or ENTER for none.
Finding splits ...
Processing only strata with beds.
Use position from another file or pick grid position [<Pick>/File]?
Pick Lower Left grid corner:
Pick Upper Right grid corner:
Weighting factor to which power [First/<Second>/Third/Other]?
Strata Name: V_KEY
Calculating grid by linear least squares 2601...

Pulldown Menu Location: StrataCalc
Keyboard Command: draw_heave_zones
Prerequisite: Drillholes