The Processing Paths step is used to allow product fields to have different values depending on how they are processed, transported and screened.
Processing streams are the mutually exclusive paths from pit to product.
Product points are the changes to the product that occur along the transport path.
Sub products are the split of product types at each point in each stream.
For example, the product grades are different through the wet plant vs the dry plant, and the ratio of Lump to Fine sub products may change when handled from rail to ship.
Typical iron ore processing paths.
Typical gold processing paths.