Resources

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 ability to rank individual mines by comminution energy intensity in an international database was identified as a priority by the Coalition for Energy-Efficient Comminution in 2012 (Napier-Munn, Drinkwater, & Ballantyne, 2012). Providing a tool to compare the comminution energy int...
15-Nov-2015
Abstract In addition to minerals displaying variations in grade within an ore body, blasted rock often concentrates particular minerals preferentially into finer size fractions. Grade engineering strategies seek to exploit intrinsic heterogeneity and grade variability to improve the viability of op...
15-Nov-2015
ABSTRACT In non-ferrous metal mining operations, it is generally necessary to crush and grind the ore to a very fine particle size to effectively liberate the contained mineral from the host rock. Fragmentation by blasting is the first stage of this comminution process. Numerous studies and indepen...
09-Sep-2015
ABSTRACT The stirred milling of nickel laterites offers possibilities for improving liberation and selective size reduction of soft nickel-bearing minerals in laterites. Batch grinding tests were performed in a netzsch™ lME4 stirred mill on siliceous goethitic, goethitic, and saprolitic nickel la...
13-Aug-2015
Fine grinding, to P80 sizes as low as 7 lm, is becoming increasingly important as mines treat ores with smaller liberation sizes. This grinding is typically done using stirred mills such as the Isamill or Stirred Media Detritor. While fine grinding consumes less energy than primary grinding, it can s...
13-Aug-2015
ABSTRACT To recover more valuable ore and considering the complexity of minerals, the need to grind finer is increasing. To reach the desired fine grinding targets using the existing grinding media size, the energy consumption is increasing exponentially. As already proved at this conference, sma...
21-Jul-2015
Abstract A stirred milling model, based on the concept of shear–volume power, was developed and applied to geometries typically found in mineral processing systems. Generalising this model permits its use to model more complex mill geometries, such as those describing a tapered disk mill and the Co...
12-Jun-2015
Mathematical modeling in conjunction with mineral characterization is widely used as a method for design and optimization of comminution circuits, to simulate the processes of crushing, grinding and classification. An important input parameter to the simulation models is the Run-of-Mine Particle Siz...
15-May-2015
Abstract DRAMP was approached by the ARM/Lion Ore JV during July 2006 to conduct a feasibility study and Control Budget Estimate for a new Greenfield’s project for their NKOMATI Ni mine 45km east of Machadadorp. The scope included the evaluation and review of previous studies as well as a techno-...
17-Apr-2015
New Gold Inc.’s New Afton concentrator commenced operation in June 2012, producing a copper-gold-silver concentrate. During the first two years of operation, various optimization efforts have improved mill throughput, recoveries and concentrate grade. Daily mill throughput has increased 20% above th...
03-Apr-2015
Abstract The total energy consumption for ore comminution will further increase within the next decades. One contribution to minimise the increase is to use more efficient comminution equipment. Vertical-roller-mills (VRM) are an energy-efficient alternative to conventional grinding technology. O...
03-Apr-2015
Abstract Stirred mill power has been modelled empirically, adimensionally and computational intensively through the use of the discrete element method and computational fluid dynamics. To this range of power modelling efforts, one more is added through the development of a shear based power for s...
03-Apr-2015
The key themes for the 2014 Workshop were best practice and benchmarking. The workshop took place in Vancouver over a 2-day period. Each day included keynote speakers who set the scene for the participants prior to break our sessions for discussion. Keynote speaker topics included, but were not limi...
02-Apr-2015
Edge effect is the widely observed condition of impaired comminution performance at the edges of High Pressure Grinding Roll (HPGR) tires. This effect is caused by a reduction in the local crushing pressure at the edges of the tires resulting from the interaction between the static cheek plates and...
16-Mar-2015
High Pressure Grinding Rolls (HPGR) technology is the continuous version of the confined particle-bed breakage. Feed size distribution has a key role in total specific energy consumption and product size reduction. Fines in the HPGR feed are defined as relatively small particles that should not unde...
16-Mar-2015
Achieving resource efficient production throughout the metal value is an imperative for society. This paper will discuss resource efficiency in a system integrated manner. It will highlight the role technology and its innovation as well as system optimization and its innovation as key drivers. Integ...
16-Mar-2015
In the last years the mining industry due to the effect of continuous decrease of metal prices and increase of operation costs that has impacted the economic performance of Mineral Processing Plants. These effects made extremely necessary to optimize productivity and profitability in actual mineral...
16-Mar-2015
Developments in ore sorting technologies have provided the ability to achieve economic dry pre-concentration of ores prior to a grinding/concentration circuit and, in some cases, produce a high grade concentrate of sufficient quality for end use. The use of dual X-ray transmission (XRT) sorting has...
16-Mar-2015
Traditional motors for milling technology has relied on either Wound Rotor Induction, Low Speed Synchronous Motors, or Asynchronous Induction Motors with mechanical gear reducers. A new alternative is now offered: The Low Speed Asynchronous Motor. This alternative provides the benefit of reduced com...
16-Mar-2015
It has been widely accepted to go for grate discharge ball milling when a coarse product is preferred or to avoid production of extreme fines, but overflow discharge mills are preferred for their simplicity of design and production of finer product. In grate discharge mills the product is discharged...
13-Mar-2015