Generate Statistics & Grade-Tonnage Curve

September 22, 2020
Mohamed Zaki

Mohamed Zaki

Mohamed Zaki is the Marketing Manager at Progeox. He has an undergraduate degree in Mining Engineering CO-OP from McGill University. With an opportunity to do 3 research studies with excellent professors from McGill University and experience in open-pit mining, he developed an interest in analyzing data using powerful programs. Upon joining the Promine team, Mohamed worked as a Quality Assurance & Support Specialist, then obtained a position as a Sales Specialist. A few months later, he took the role of a Marketing Specialist in which he currently operates to promote the professional image and products of Promine Company.

In this tip of the month, we will see how to insert a statistics report and generate a grade- tonnage curve for a block model. This is really useful to quickly analyze the properties of each grade value and to determine the optimal point of obtaining the maximum grade without decreasing the tonnage. To do so:

  1. Insert the objects to be analyzed. This can consist of blocks, samples, composites or points. In this specific example, a block model is
  2. From the Exploratory Data Analysis module, go to the module options and:
    • Select the type of objects to be analyzed
    • Configure the report format
    • Select the statistics items to be in the report using the “->” button. To remove an item, select an item and click the “<-“
    • Click OK once the parameters are
  3. Select the “Statistics” (EDAS) command, select the block model and hit Enter. A window will appear showing the grade values found in the block model. Select the option “Display units” and click OK. Place the Statistics report in the drawing. This report includes the statistics items chosen in the module
  4. Select the “Grade-Tonnage curve” (EDAGTC) command and select the block model (note that this command only works with block models). Hit Enter and configure the parameters in the window:
    • Select the grade type
    • Input a density
    • Input a minimum cut-off grade (based on the statistics report)
    • Input a maximum cut-off grade (based on the statistics report)
    • Select “Graph” to display the Grade-Tonnage graph of the selected grade
  5. The cut-off grade is on the X-axis. The tonnage above cut-off grade is on the left-hand side of the Y-axis. The average grade above cut-off grade is on the right-hand side of the Y-axis. The optimal point consists of the intersection of both curves. This point determines the maximum average grade above the cut-off grade without decreasing the tonnage. To display the exact coordinated of this point, right-click and select the “Show point values”. To save this graph as an image, right-click and select “Save Image ..”


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