Benchmarking: Bond - Cadia

Benchmarking: Bond/Barratt - Cadia

Dunne, R., Morrell, S., Lane, G., Valery, W. and Hart, S., Design of the 40 foot diameter SAG mill installed at the Cadia gold copper mine. Proceedings of SAG 2001, pages I-43 to I-58.

Lane, G., Foggiatto, B. and Bueno, M, Power-based comminution calculations using Ausgrind. Proceedings of Procemin 2013, Chapter 2, paper 2.

Papers describe a survey conducted shortly after start-up.

Ore characterization

• Monzonite ore type,
  • Wi_C = 16.5 (metric)
  • Wi_RM = 19.0 (metric)
  • Wi_BM = 17.1 (metric)
  • A×b = 36
  • DWI = 7.5
  • density = 2.7 t/m³

SAG mill characteristics

• Diameter inside shell = 12.2 m (40 ft)
• EGL = 6.1 m (20 ft)
• Ball filling = 12% v/v
• Total filling = 25% v/v
• Mill speed = 78% of critical (Lane et al, 2013 appears to have a typo. They claim 72% which actually looks like the BM speed)
• Pulp density = 70% w/w
• SAG feed is primary crushed to F₈₀ = 98 mm

Ball mill characteristics

• Diameter inside shell = 6.7 m (22 ft)
• EGL = 11.3 m (36.5 ft)
• Ball filling = 30% v/v
• Mill speed = 72% of critical
• Pulp density = 70% w/w
• Ball mill circuit product P₈₀ = 170 µm

Modelling

• 

  Model screenshot of Cadia 1998 survey simulation

• 

  SAG model screenshot of Cadia 1998 survey simulation

• 

  Ball mill model screenshot of Cadia 1998 survey simulation

Results

Result for default model conditions:

	Esag	Epeb	Ebm	Etotal	t/h	T80, mm
Predicted	8.6	0.3	8.5	17.4	2000	2.06
Survey	8.6	-	8	16.6	2065	1.34
Difference	0	0.3	0.5	0.8	-65	0.72
Difference	0%	-	6%	5%	-3%	54%