This activity covers the practical calculation of Differential Blasting potential from raw bench scale grade data. Utilising the supplied fragmentation curves and grade tonnage bins calculate potential screen upgrades using a 50mm screen size. Determine the best decision (in terms of final screen upgrade) of which grade bins should receive which energy.
Activity 2 Notes:
- Given no Natural Deportment mass percent will equal metal percent before screening
- Metal units = grade x tonnes, and is a useful measure for applying metal percents
- Calculate stream grades by reversing this, metal units / tonnes = grade
- Overall screen outcomes will be based on compositing all utilised material streams
- e.g. high energy oversize plus low energy oversize
- Your screen O/S+U/S must always equal the blast total
- There are three potential outcomes from this activity;
- 1. Only the waste material receives low energy, all others are high energy
- 2. Only the high grade receives high energy, all others are low energy
- 3. Waste and low grade receive low energy, med and high grade receive high energy
- To accurately compare upgrades from these three outcomes you will need to normalise out the mass aspect (building on Activity 1)