Attributes

Attributes are used to represent grades for blending and are also used as a basis for the financial model. Attributes are associated with a particular process. For example a Mill process may have cu and au as grades associated with it.

When blocks are combined for schedule optimization or reporting purposes, the attributes are linearly averaged using attribute values, process ratios and block tonnes. The average attribute value for a combinations of blocks is calculated as follows.

Where:

• Tonnes is the block tonnes.
• PR is the process ratio.
• att is the attribute value.