Once you've got a waste dump to fit within a specific footprint, you then need to determine its crest elevation to store your target volume of waste. This is done by taking the toe of the waste dump shell, the geometry parameters (slopes, bench width/height) and then running a height optimisation to determine crest elevation.
| This tutorial assumes that a dump has been created as per this tutorial. |
The command used for the height optimsation is Dumps/Build a dump by volume. To use this command, a dump toe is required. The actual toe of the dump shell (where it intersects the terrain) is illustrated in the image below. This is a difficult line to work with geometrically - there are lots of points on it, it varies considerably in elevation, and so trying to project this upwards to generate the dump shell would yield a less than satisfactory result.
An example of projecting this toe to a target elevation is shown below (for simplicity in this example, the benches were ignored).
Instead of the real, day-lighted, toe of the dump, we use the toe of the dump shell that was created to fit the target footprint as our reference line to project the dump upwards.
The polyline for the toe of the dump can be added to the 3D window by clicking on the Show button next to the toe output in the dynamic model. This can then be used by the Build a dump by volume command and the resulting dump created that stores the target volume will maintain the same footprint as the original fitted dump.
