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All minecost.com models are constructed to work as consistently as practicable across all metals. Since it is our practice to model each separate mining operation feeding the mill - and each separate mill, where relevant, as with the demonstration Grasberg model - many of our models are very large with multiple sheets for each mine. But we try to present the models in as comprehensible form as possible to the user. This means that we hide the "working" sheets containing all the calculations to make the presentation as standard as possible.
But this also means that the models become less transparent and sometimes difficult for users to satisfy themselves that the models and the internal calculations are consistent and make sense. Although the Reconciliaton section at the bottom of the Opcost sheet is there to verify the model arithmetic, people often need to have a better understanding of the model calculations. Many users are interested in performing benchmarking exercises with minecost.com models and need to know exactly what is included in each cost item as shown in the Opcost sheet. For these reasons, and in the interests of model transparency, we have set up a sample model showing just how the formulas and calculations work. This user guide contains all the standard sheets presented in the models, with comments and explanations beside each item displayed in yellow cells. We have also annotated the (normally hidden) model working sheet to let you see just what is included in each flowsheet item modelled, and the composition of the three main categories labor, supplies and materials associated with each flowsheet item. It is these proportions that are used to estimate labor and materials requirements for the mine and mill as shown in the Flowsheet sheet. Registered subscribers can download the free User Guide to minecost.com Models by clicking this link.
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