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Pit Limit

After the block model of your orebody has been entered manually, or has been transformed from other data, you are ready to determine the ultimate pit limit for your orebody.

Your block model should look like this:

Each cell's value should be the value of the block.

Select one of the three pit limit generator algorithms from the UPL menu. You can select 'Korobov' 'Lerchs-Grossman' or 'Moving Cone'. Each of these algorithms works differently. Once selected, the program will calculate the ultimate pit limit for your block model:

 

Here, the ultimate pit limit is shown in red. In addition, UPL shows a summary of the pit:

 

If you click on 'Export Results', UPL will write these results to a new workbook.

To become familiar with the operation of UPL, go to the examples directory included with the UPL distribution. There are several examples of block models, on Excel spreadsheets. Run them with the various program algorithms, and see how each behaves differently under different conditions.

To calculate a 3D pit, go again to the UPL menu, and select the 'General Options...' Select the 3D radio button, then select one of the pit generating algorithms again. If you want 3D, you'll need more than one sheet in your workbook with data, otherwise, it'll look no different than a 2D output.

A 3D output will provide an output with a vertical view of the block model:

And a horizontal view: