T. Robinson, B. Widdows and J. Rosenberg MetPlant 2019, September 9-10, Perth, Australia POSTER ABSTRACT Increasing mill availability is a key improvement to the productivity of most mine sites. Mills are often running at maximum capacity, consequently any downtime reduces the mine output. O...

25-Sep-2019

T. Waters, A. Rice, J. Seppelt, J. Bubnich, B. Akerstrom 14th AusIMM Mill Operators' Conference 2018, 29-31 August, Brisbane ABSTRACT The Concentrator 1 plant at Cadia transitioned from Cadia Hill open pit to the Cadia East block cave ore body in 2013. As a result of this change, major plant upgr...

01-Jul-2019

A Hinde, E. Ford, J. Makola, A. Jain Copper Cobalt Africa, 10-12 July 2018, Livingstone, Zambia ABSTRACT A large contributor to the energy consumption of metallurgical plants is the mill circuit. A popular circuit configuration is one involving a primary open-circuit semi-autogenous mill fol...

23-Apr-2019

K M Bartholomew, R E McIvor and O Arafat 14thAusIMM Mill Operators’ Conference, 29-31 August 2018, Brisbane, Australia ABSTRACT It is well known in the industry that good classification system performance is vital to efficient ball mill circuit performance. But what is meant by good classificati...

22-Oct-2018

M Powell, M Yahyae, J Geronimo, Z Yussupova and P Kumar  14thAusIMM Mill Operators’ Conference, 29-31 August 2018, Brisbane, Australia Kazakhstan ABSTRACT The appropriate design of liners continues to be an issue on many mills worldwide. Loss of milling capacity especially at liner ch...

22-Oct-2018

B PUTLAND, I LOVATT, A CERVELLIN AND D SCHWANN 14thAusIMM Mill Operators’ Conference, 29-31 August 2018, Brisbane, Australia Australia The Mount Carlton project in Queensland's North East sits on a high-sulphidation epithermal style deposit rich in gold, copper and silver. Mt Carlton is an open...

27-Sep-2018

R BRADFORD, W GIFT-AGBEY, E GROBLER, P MORGAN AND T VORSTER  14thAusIMM Mill Operators’ Conference, 29-31 August 2018, Brisbane, Australia Africa ABSTRACT The Asanko Gold Mine in Ghana started processing ore from the Nkran pit in January 2016 at a production nameplate of 3 Mt/a. The flowsh...

27-Sep-2018

R.E. MCIVOR, K M BARTHOLOMEW, O M ARAFAT AND J A FINCH Mining Engineering, November 2017 United States ABSTRACT Since its development, the functional performance equation for ball milling (McIvor, 1988) has facilitated a new understanding of industrial circuit cause and effect relationships, lea...

06-Jun-2018

Robert E Mclvor Mining Engineering, 2014, Vol. 66, No. 9, pp. 67-71. Official publication of the Society for Mining, Metallurgy & Exploration Inc. ABSTRACT Classification system efficiency (CSE) is a simple metric that can be used to measure and increase ball milling circuit efficiency. It is...

26-Aug-2017

Dry processing of magnetic iron ores – addressing cost and environmental issues W Skinner (1) and J R Kelly (2) AusIMM Iron Ore 2017 Conference, Perth, Australia, 24-26 July 2017. Paper Number: 86 ABSTRACT The Iron ore industry has reached the end of an unprecedented period of ex...

26-Aug-2017

The Energy Saving Technology of Beneficiation of Iron Ore V V KARMAZIN, M A BIKBOV AND A A BIKBOV MAGNETIC AND ELECTRICAL SEPARATION, VOL 11 (4), PP 211-224 ABSTRACT The qualitative and quantitative evaluation of liberation of economic minerals and thelevel of contamination of the process produc...

25-Aug-2017

P STAPLES, G LANE, R BRAUN, B FOGGIATTO AND M P BUENO PRESENTED AT SAG CONFERENCE, SIXTH INTERNATIONAL CONFERENCE ON SEMIAUTOGENOUS AND HIGH PRESSURE GRINDING TECHNOLOGY, VANCOUVER, 20-24 SEPTEMBER 2015. ABSTRACT Autogenous (AG) and semi-autogenous (SAG) grinding mills are considered a mature tec...

18-Jul-2017

S NKWANYANA AND B LOVEDAY (1) PRESENTED AT COMMINUTION ’16, MINERALS ENGINEERING INTERNATIONAL, PUBLISHED IN MINERALS ENGINEERING VOLUMES 103-104, BARRY WILLS (ED), APRIL 2017. ABSTRACT Ball-mills are used widely for secondary grinding. Loveday (2010) reported on laboratory tests in which s...

18-Jul-2017

G S ANDERSON1 AND N W MCDONALD2 13TH AUSIMM MILL OPERATORS’ CONFERENCE, PERTH, WA, 10-12 OCTOBER 2016. ABSTRACT The IsaMill™ was originally developed to address liberation issues at Mount Isa Mines (now Glencore) operations, McArthur River and Mount Isa in the early 1990s. Follow...

18-Jul-2017

C CARRASCO1 2, L KEENEY 1 2, T J NAPIER-MUNN2, P BODE1  PRESENTED AT COMMINUTION ’16, MINERALS ENGINEERING INTERNATIONAL, PUBLISHED IN MINERALS ENGINEERING VOLUMES 103-104, BARRY WILLS (ED), APRIL 2017. ABSTRACT Grade Engineering® comprises a range of techniques aiming to reje...

18-Jul-2017

Breaking Down Energy Consumption in Industry Grinding Mills J Bouchard (1), G LeBlanc (2), M Levesque (3), P Radziszewski (4) and D Georges-Filteau (1) 49th Annual Canadian Minerals Processors Conference, Ottawa, Canada, 2017    ABSTRACT Grinding mills are infamous for their extremely...

26-May-2017

Simplified hybrid semi-autogenous grinding mill control – explanation and practical results at the Porgera concentrator S Ngunz, F van Zyl, F Orrante, E Beltran, M Westcott and S Wilson AusIMM Mill Operators Conference 2016   ABSTRACT The primary control objective of the project is to...

26-Apr-2017

The transition from semi-autogenous to autogenous milling at Waihi Gold C Haines and D Bertoldi AusIMM Mill Operators Conference 2016   ABSTRACT The Waihi Gold Mine (WGM) operated by OceanaGold New Zealand Limited is a wholly owned subsidiary of the OceanaGold Corporation of Australi...

26-Apr-2017

Grinding circuit practices at Newmont A Giblett and S Hart AusIMM Mill Operators Conference 2016   ABSTRACT In 2015 operations under the ownership and/or management of all Newmont Mining Corporation subsidiaries (Newmont) produced 5.7 Moz of gold and 619 Mlb of copper from mining opera...

26-Apr-2017

Design, installation, commissioning and operation of fine grinding technology at the Kevitsa Mine B Nielsen, H Lehto & B Musuku AusIMM Mill Operators Conference 2016   ABSTRACT The demand for fine and ultra-fine grinding associated with the processing of more challenging, finer gra...

26-Apr-2017

Abstract The comminution energy curve is a profoundly simple graphical technique that displays detailed operating efficiency information for industrial comminution processes. The database underlying the methodology has recently more than doubled, to now contain a substantial fraction of the interna...

31-May-2016

ABSTRACT Simulation work was carried out to analyse how feeding a finer size distribution to a single stage SAG mill in closed circuit with hydro cyclones at Freda Rebecca Gold Mine would affect throughput and specific energy consumption using an Excel based milling process simulator developed by...

07-May-2016

Abstract A computational model for use with DEM (Discrete Element Method) is proposed for the five mechanisms applying to particle comminution in AG, SAG and coarse feed ball mills. Chipping and rounding are mechanisms that lead to preferential mass loss from corners and edges of particles and whic...

18-Apr-2016

Abstract Stirred mill technology dates back to 1928 where the idea to use "an agitator and spherical grinding media" was presented. In the context of the mining industry, interest in stirred milling technologies has grown over the last 20 years where the typical observation reported in the literatu...

20-Mar-2016

ABSTRACT Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, o...

20-Feb-2016

Abstract The breakage characteristics of a two-component ore in a confined bed was studied in this work in order to predict the breakage behaviour of a multi-component ore from the properties of individual components. Bed compression tests with each single component and blended components at differ...

19-Feb-2016

Abstract A specific energy-based size reduction model for batch grinding ball mills was reported in a previous paper (Shi and Xie, 2015). A discharge function modified from the Whiten classification efficiency equation has been incorporated in the size reduction model to extend its applications fro...

19-Feb-2016

Abstract The slurry level in AG/SAG and ball mills has an influence on their power draw, which in some instances can be profound. This is particularly the case with so-called slurry pooling in AG/SAG mills which can result in significant lowering of power draw. From a predictive viewpoint there are...

19-Feb-2016

Abstract The Institute of Mineral Processing at the Montanuniversitaet Leoben in cooperation with the company CEMTEC has developed a pilot scale, 200 mm table diameter, vertical roller mill for energy controlled laboratory tests. The mill provides the technical options to vary process parameters li...

12-Feb-2016

Abstract In the dry grinding industry the demand for very fine particle size distributions is increasing rapidly. At the same time a growing awareness for an economical management of our planet's resources has raised the demand for energy efficient processes. Roller mills in general and specific...

12-Feb-2016

Abstract Liners in grinding mills not only protect the mill shell from the aggressive environment inside the mill, but they also play a significant role in the efficiency of grinding. The design of mill liners dictates the charge trajectory and hence the grinding efficiency. The common approach in...

12-Feb-2016

Abstract This paper compares the performance associated with both direct and reverse ball mill closed circuit configurations. Survey campaigns were carried out in both Samarco Mineração industrial plants, i.e., Concentrator I and Concentrator II. The former is equipped with a reverse-configured b...

12-Feb-2016

Abstract The latest state of the art on Discrete Element Method (DEM) and the increased computational power are capable of incorporating and resolving complex physics in comminution devices such as tumbling mills. A full 3D simulation providing a comprehensive prediction of bulk particle dynamics i...

12-Jan-2016

ENHANCED OPEN GEAR LUBRICANTS PROVIDE TANGIBLE BENEFITS FOR HEAVY INDUSTRY – THEY ARE THE ‘CLEAR’ CHOICE FOR IMPROVED OPEN GEAR RELIABILITY ABSTRACT The maintenance of large open gear systems at mines, power or cement plants present a significant challenge due to the heavy loads and harsh enviro...

01-Dec-2015

ABSTRACT PT Newmont Nusa Tenggara – Batu Hijau site mine to mill program has been systematically improved and resulting in Geo-Metallurgical detailed ore characteristics is successfully being used for short and long term business planning and mill throughput predictions. Actual plant operating an...

30-Nov-2015

Abstract More complex ore bodies with lowering grades increase the challenges of maintaining high throughput, energy efficiency and required particle size for optimal downstream processing in grinding circuits. Continuous and often rapidly changing characteristics of the mill feed requires consta...

26-Nov-2015

Abstract The effect of liner wear on SAG mill performance has gained much attention in recent years. It is commonly observed that the three key performance criteria of SAG milling; throughput, power and product size all improve as the liner wears. The increase in throughput is generally ascrib...

26-Nov-2015

ABSTRACT Mining consumes approximately 7% of the world’s energy from which almost half goes for comminution. Since the crushers are more energy efficient than mills, it is logic to push down-sizing in crushing stage(s) as far as possible. That has been Sandvik’s strategy in supplying crushers, in...

25-Nov-2015

ABSTRACT Blasting plays a major role in the fragmentation of rock in open pit mining, which is then crushed and processed before the final product is obtained. Tailoring the blasting method to suit rock mass characteristics can lead to significant improvements downstream. Mine to Mill is a method...

25-Nov-2015

ABSTRACT The inherent conservatism of the mining industry is well understood, but the current hurdles encountered with financing new projects have complicated instances when new technologies such as high pressure grinding rolls (HPGR) are considered, especially if it translates into higher capita...

25-Nov-2015

ABSTRACT At the regrind or secondary grinding stages of base metal ores, the concern about energy efficiency is usually extremely important. In general, the specific energy consumption at this stage is higher than during the primary grinding stages. In addition, a tendency of finer grinding has bee...

21-Jul-2015

International Journal of Mineral Processing 2004 Despite reservations of a number of researchers concerning the applicability of Bond's equation for relating specific energy to the size reduction of rocks, his approach has become an industry standard. Data from a large number of pilot and full-s...

29-Mar-2005

XXII International Mineral Processing Congress, Cape Town, South Africa The introduction and subsequent ascendancy of autogenous and semi-autogenous milling for comminution circuits has undoubtedly lead to many economic advantages. From a process viewpoint, however, at least one downside has been...

23-Aug-2003

Comminution 1998 This paper presents observations made during the conduct and analysis of eleven separate autogenous and semi-autogenous pilot plant trials. These trials were conducted using different ores for various projects over the past five years. The ores tested include relatively competent...

22-Nov-1998

SAG'96 The Julius Kruttschnitt Minerals Research Centre (JKMRC) has been involved in the study and modelling of industrial autogenous (AG) and semi-autogenous (SAG) mills for over 20 years. Recent research at the JKMRC has developed a new AG/SAG mill model which is based on charge dynamics. The m...

28-Nov-1996