# User talk:Alex Doll

Not sure what to do with this benchmarking data yet, but I'll record it here so I can find it in the future

## Contents

## Ball and liner wear benchmarking

*Ben Burger, Luis Vargas, Hamer Arevalo, Sergio Vicuna, Jim Seidel, Walter Valery, Alex Jankovic, Roberto Valle and Eduardo Nozawa*, **YANACOCHA GOLD SINGLE STAGE SAG MILL DESIGN, OPERATION, AND OPTIMIZATION**, SAG 2011

Single-stage SAG mill, reported with slurry pooling

- New liner effective thickness: 7.7 inches (half-worn 5.5 inches)
- Ball charge: 19% v/v (18-20%)
- total charge: 22.5% v/v (20%-25%)
- grate open area 12%; wear rate 0.6 mm/day (rubber)
- Operating work index 23.0 - 25.2 metric
- Ball consumption: 3 kg/t (2-3.5 kg/t) or 0.16 g/kWh
- Bond predicted ball mill ball consumption: 0.13 kg/kWh;
*actual ~ predicted* - Bond predicted ball mill liner consumption: 9.5 g/kWh
- Shell liners life of 6 months; assume 3" thick at end of life. 5 g/kWh wear (+ 3 g/kWh scrapped)
- Grate wear: 0.06 g/kWh steel; 0.02 g/kWh rubbber

- Laboratory testwork:
- Bond abrasion index: 0.5 (0.467-0.555)
- DWi 3.45 kWh/m³
- Mia 12.3
- A: 82.8; b: 0.88; A×b: 72.9
- t
_{a}: 0.75 - density: 2.52 t/m³

## SAG liner wear benchmarking

Orford, I., Larsen, C., Cooper, M., Renaud, M. & Strah, L **Brunswick Mine SAG Liner Design & Wear**, CMP 2003

- SAG liner wear 2.6 g/kWh
- liners typically replaced with 50% steel remaining
- Ai not given, but assume 0.3 for a massive sulphide
- Bond ball mill liner wear estimate: 8.1 g/kWh
- SAG wear is less than half the Bond BM prediction.

## Ball wear benchmarking

Larsen, C., Cooper, M., & Trusiak, A. **Design and Operation of Brunswick's AG/SAG Circuit**, SAG 2001

- Operating work index: 11.5 kWh/t
- SAG operating with 4% ball charge (originally was AG)
- SAG 4" ball wear rate: 0.12 kg/t (10.4 g/kWh)
- BM 24 mm slug wear: 0.91 kg/t (80 g/kWh)
- Assume Ai of 0.3, BM ball wear rate prediction: 105 g/kWh

The parallel RM/BM plant has same operating work index, but following wear:

- Rods 0.39 kg/t
- 38 mm balls: 0.72 kg/t
- 25 mm slugs: 0.94 kg/t

Since Wi_{O} is the same for both, the SABC ball wear is half the RM-BM combined steel wear.

## Ball Mill Ball wear benchmarking

Villanueva, F., Ibañez, L., & Barratt, D. **Los Pelambres Concentrator Operative Experience**, SAG 2001

- BM Operating work index: 15.9 kWh/t (14.4 kWh/st)
- Laboratory ball mill work index: 12.1 kWh/t (11.0 kWh/st)
- T
_{80}: 2.5 - 3.0 mm (raw measurement) - BM specific energy consumption: 11.9 kWh/t
- BM ball wear: 315 g/t