Grade and tonnage calculations

This section describes how to create a block model constraint of blocks within a pit design, and how to generate a report of the tonnes and grade of material within the constraint.

Task: Create a block model constraint of material in a pit

In order to calculate grade and tonnage from a block model, you can create the constraint that represents the material in the pit beforehand.

1. Open pitdesign.mdl.
2. Choose Block model > Block model > Display.
3. Enter the information as shown, and click Apply.



4. Choose Block model > Constraints > New graphical constraint.
5. Enter the information as shown, and click Apply.



Note: The constraint file pit_design2.con is created, which is a list of all blocks within this constraint.

6. Choose Block model > Display > Colour model by attribute.
7. Enter the information as shown, and click Apply.



8. Spin the model around to see the blocks coloured by gold grade.

Most of the blocks are waste (gold=0), and are coloured dark blue.



Note: To see all of the steps performed in this task, run _15_create_pit_constraint.tcl. You need to click Apply on any forms presented.

Task: Calculate Grade and Tonnage of Material in Pit

1. Open pitdesign.mdl.
2. Choose Block model > Block model > Report.
3. Enter the information as shown, and click Apply.



4. Enter the information as shown, and click Apply.



5. Enter the information as shown, and click Apply.



6. The file pit_design2.not is displayed.



Note: Your report should be similar in format, but the numbers may not be exactly the same.

Note: To see all of the steps performed in this task, run _16_grade_and_tonnage.tcl. You need to click Apply on any forms presented.