Investigating the size segregation of stockpile at MMG’s Las Bambas and its impact on performance of SAG mills

Yahyaei, Ye, Hilden, Ruiz, Gavelan

Presented at the AusIMM Mill Operators Conference June 2021

ABSTRACT

Stockpiles and bins are an integral part of every mineral processing plant, and their design and operation play a significant role in plant performance. Size segregation, which is a common phenomenon in most storage and materials handling facilities, could severely impact the performance of comminution and classification units downstream. Therefore, the ability to model the dynamic response of bins and stockpiles is important for enabling operators to enhance the operation and control of bins and stockpiles and minimise the impact of size segregation on downstream units’performance.

MMG’s Las Bambas operation is a major copper mine worldwide placed between Grau and Cotabambas provinces, Apurímac region, Peru. The Las Bambas concentrator produces copper concentrate with gold, silver and molybdenum. The concentrator consists of two parallel SAG mills,each followed by a ball mill closed circuit with primary cyclones. Both lines are fed from coarse ore stockpile (COS) with 1000000ton primary crushed ore capacity.

The Las Bambas concentrator utilises Advanced Process Control (APC) along with a well-established quality control system to ensure high performance of each processing unit and consequently the overall process.

One of the key challenges in maintaining the stability of the process is size segregation in the COS which causes instability in SAG mill’s performance. Therefore, the 3D dynamic model of stock which is developed in Julius Kruttschnitt Mineral Research Centre (JKMRC) is adapted to quantify the size segregation of the stockpile at Las Bambas and identify control strategies that suit the operation of SAG mills at various operating conditions.

In this paper, the results of analysis conducted on Plant Information (PI) data and analysis of the behaviour of the stockpile at different operating regimes are presented.

AUTHORS

M Yahyaei1, Z Ye2, M Hilden3, E A Ruiz4andZ Gavelan5

1. Associate Professor, Julius KruttschnittResearch Centre, The University of Queensland, Brisbane Qld 4068.Email:This email address is being protected from spambots. You need JavaScript enabled to view it.

2. PhD Candidate, Julius Kruttschnitt Research Centre, The University of Queensland, Brisbane Qld 4068. Email:This email address is being protected from spambots. You need JavaScript enabled to view it.

3. Senior Research Fellow, Julius Kruttschnitt Research Centre, The University of Queensland, Brisbane Qld 4068. Email:This email address is being protected from spambots. You need JavaScript enabled to view it.

4. Metallurgy Superintendent, Minera Las Bambas, Jr. Cesar Vallejo J-3, Urb. Santa Mónica, Cusco, Peru. Email:This email address is being protected from spambots. You need JavaScript enabled to view it.

5. Operations Vice President, Minera Las Bambas, Edificio Cronos, Torre 3, Piso 9, Av. El Derby 055, Santiago de Surco, Lima,Peru. Email:This email address is being protected from spambots. You need JavaScript enabled to view it.

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