# Benchmarking: Meadowbank ball mill model

## Benchmarking: Ball Mill Power Draw - Meadowbank

*Muteb, P. & Allaire, J.*,**Meadowbank Mine Process Plant Throughput Increase**, Proceedings of the Canadian Mineral Processors Annual General Meeting, Ottawa, Canada, January 2013.

The ball mill design given as:

- Diameter inside shell: 18 ft
- Length (assumed to be flange-to-flange length): 29 ft
- Effective grinding length: 28.5 ft (using rule-of-thumb half-foot basis)
- Motor size: 6,000 horsepower (4,474 kW)
- Overflow mill with synchronous motor assumed

The operating conditions of the May 2012 survey, including the pre-crushing circuit given as:

- Mill speed 14.19 rpm (75% critical)
- Volumetric filling 30.6% v/v
- Ball charge 30.6% v/v
- Ore density 2.93 kg/L
- Grindability: A×b 38.6; Wi
_{BM}10.9 kWh/t

Liners assumed to be an effective thickness of 3 inches. DCS power is assumed to be indicated (mill power measurements × 0.985 pinion × 0.96 motor eff equals power "at mill shell"). Model power measurements are shown "at DCS".

DCS Power, kW | Mill filling | Morrell Model, kW | Nordberg model, kW
no density correction |
Nordberg model, kW
density correction | |
---|---|---|---|---|---|

May 2012 | 4,341 | 30.6% v/v | 4,765 (+9.3%) | 4,426 (+1.9%) | 4,753 (+9.5%) |