AAOM Handbook

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INTERNAL USE ONLY

• Upstream Constrained rate : The constrained production rate of the preceding production process. The formula looks at the constrained output column of the previous process to determine if there is enough feed from the upstream process for the current process, or if the current processes capability can handle the feed coming in from the upstream process. • Upstream Storage : The available stock of the immediately preceding stockpile at the start of the determined time period. • Downstream Storage : The available storage capacity of the immediately succeeding stockpile at the start of the determined time period. It is calculated as the max capacity of the stockpile minus the start capacity of the specific period. • Constrained rate: This is the output of the calibrated output that the logic calculates. The constrained/actual production rate of a production process for a determined time period. • Split Logic: Where required include node for calculating downstream constraints as a result of splits such as concentrate and tailing or multigrade such as high grade, medium grade and low grade ore. • Stock Flow Logic: Transforming process depends on preceding stockpile • Direct Feed Logic: Transforming process can be fed directly where preceding stockpile may be empty. Calculate the constrained rate of the first transform/transfer process First production process in the Business Structure as illustrated in Figure 18 would use the logic formula shown in Figure 19.

Figure 18 – First production process to be modelled

Operational Planning: Building a Business Structure Performance Model Page 19 of 39