Stockpile Concepts

Stockpile Balances

Stockpile Balances are calculated to measure the mass and grade of a stockpile. In Reconcilor, stockpile balances can use the raw dataset or an adjusted dataset (if it exists for your site):

• Raw stockpile balances - The calculation of stockpile balances using Resolved Raw transactions only.
• Adjusted stockpile balances - The calculation of stockpile balances using a transaction that has been scaled or adjusted. This is NOT the stockpile adjustment, rather a dataset that has been calculated on a set of business rules specific to your site.

The balance begins with the opening balance specified against the stockpile and its opening date and shift. The balance is then calculated and carried forward until the point it is closed, even if there is no activity for the stockpile on that shift.

Stockpile Composition

Stockpile Composition is a term used to describe the block balance of a stockpile. For example, if a stockpile has 1,000 tonnes, the stockpile composition can be 500t of Block A and 500t of an unknown block. A stockpile’s composition may not always be known due to a variety of factors such as negative balances, stockpile adjustments or additions of unknown components. This means that a composition of an “Unknown” block is valid.

Stockpile composition is calculated using a modelling algorithm and is used to calculate a reconciled stockpile balance.

For all stockpile reclaim movements, the source stockpile is used as the source against that movement (not the original block that was added to the stockpile). If the stockpile algorithm is FIFO, LIFO, LIFO_average or LIFO_configured the grade of the original block will be retained, not the block ID.

Stockpile Adjustments

Stockpile Adjustments refer to manual changes to stockpiles created by users. These are used typically for manipulating the mass or grade balance on a stockpile.

Stockpile Balance Adjustments reset the balance of the stockpile to equal the values set on the adjustment. These adjustments are applied by the Raw Stockpile Balance (RSB) service at the end of its calculation. This is to allow any other values that are not specified in the adjustment to be calculated first. For example, if the stockpile adjustment only updates one of the multiple grades in the set then the other grades will be calculated first before overriding the one grade value.