Metallurgy & Mineral Processing

Issue: 
#48
Modifying blasting practices to achieve optimum mill-size for ore extraction.
Over the past 15 years, mine-to-mill studies have focused attention on the impact blast fragmentation has on concentrator throughput. Blasting provides the first opportunity for comminution – or size reduction. It is also a cheaper and more efficient process, compared to both crushing and grinding. One of the most valuable...
SRK has extensive experience with the design of metallurgical plants from Process Flow Diagrams to the Process Control Philosophy Document
The process design of a metallurgical plant follows logical steps, one built on another, to define the circuit requirements. The methodology used and documentation produced is the same for a pre-feasibility study, feasibility study or a complete design, regardless of the process complexity or the commodity. The only difference is...
Froth flotation can recover many minerals, but requires laboratory testing to maximize retention and seperate minerals.
Froth flotation is a very important mineral concentration process that is used to recover a vast array of different minerals containing valuable commodities such as copper, lead, zinc, nickel, molybdenum, tungsten, silver, gold, phosphate and potash. In the flotation process, ore is ground to a size sufficient to adequately liberate...
SRK manages metallurgical testing for pre-feasibility study of Dominga Iron Oxide-Copper-Gold Project, Chile.
SRK Chile is managing a pre-feasibility study (PFS) for the Dominga Iron Oxide-Copper-Gold Project located in Region IV of Chile. The project is owned by Andes Iron SpA. Prior to the PFS, SRK managed a scoping study for the project, with the metallurgical testwork supervised out of SRK’s UK office...
Laboratory metallurgical testing during scoping and feasibility increase accuacy and allow results to be used in flowsheet design.
Evaluation of mining projects generally start with an initial scoping-level study, and if justified, proceeds to more detailed prefeasibility and feasibility evaluations. A scoping-level study is generally conducted to the +/-50% level of accuracy, with flowsheet development and processing assumptions based on limited testwork. A prefeasibility-level study is typically conducted...
Mineralogy evaluates why gold loss is high, and discovers possible solutions to improve gold recovery.
SRK completed several studies on gold-bearing, complex-sulfide ore feed and autoclave tailings from a mine on the Carlin trend in northern Nevada. Feed, mill and autoclave products were studied at different stages of an autoclave process to identify the reason for variable recovery in some ores. Under the standard operating...
Mixed mineralogy at Silangan project in Philippines requires process flowsheet to manage many different ores.
Since 2010, SRK has been working with Philex Mining Corporation on their Silangan project, located on Mindanao Island in the Philippines. For this copper-gold project, SRK was requested to investigate block caving as the mining method; a particular challenge considering this is a high rainfall area. However, Philex personnel are...
Many people in the mining industry have heard stories about how the ore was ‘harder than expected’ or the mill is ‘not achieving design throughput’. How can this problem be avoided? It comes down to three main factors: varying hardness across the samples, using different testing methods to check for...
The porphyritic ore features the tight intergrowth of sulfide minerals, and different sizes of sulfide minerals tend to show up.
Copper sulfide represents the main source of produced copper. The three main types of copper sulfide deposits are high grade massive and disseminated copper-porphyritic and copper-bearing sandstone. Unlike the copper sulfide deposits presented by massive ores, copper-porphyritic deposits contain only 5-10% of the ore minerals, mainly represented by chalcopyrite, pyrite,...
Creating complex project flowsheets is necessary to recover maximum amount of gold for cost but requires creativity, good data, and expertise.
It has been said that gold was one of the first metals to be mined. As deposits with free, coarse gold were depleted and the volume of mining increased, process flowsheet design became more and more complicated. Gravity was the first method developed to recover gold from ore. But, currently...
Greater communication between mills and mines increases overall efficiency and saves overall costs, as process optimisation demonstrates.
The mining industry continues to practice using ‘operational silos’ where different parts of an organisation work in isolation to achieve goals that only affect themselves. While this may keep costs from getting out of hand for their narrow segment of the mining process chain, it can have devastating effects on...
By integrating teams of geologists and metallurgists, SRK incorporates geometallurgy into their practice.
Geometallurgy has been described as a ‘comparatively young analytical field that aims to bridge the gap between geology and metallurgy’. By that definition, the principles behind geometallurgy have always been best practice in metallurgical process development: developing an understanding of the metallurgical response of an orebody in the context of...
Plant benchmarking and process modelling facilitate identification of problems and optimization of plant efficiency.
Processing plants are designed according to metallurgical tests performed on composite samples and the range of recoveries is explored by testing composites for variability. Nevertheless, the day-to-day activities of a mining operation are more dynamic than ever and every project has its range of ore variability. Mill performance changes may...
Model to evaluate the success of in situ leaching at Khiagda project in Russia.
In situ leaching (ISL), also known as in situ recovery, is a low capital-cost method of extracting uranium, copper or potash from suitable deposits. A suitable deposit is one where the commodity is located in saturated permeable horizons or distinctive geological areas that are bounded above and below by impermeable...
Designing a leach circuit should consider both ore-specific factors as well as factors involving the interaction between the ore and process equipment. Achieving the optimum leach performance involves combining operating parameters, such as grind size, residence time, chemical conditions (reagent addition levels, temperature, etc.), most of which interact with each...
SRK designs feasibility-level metallurgical development program and process flowsheet for Yellowknife Gold project.
Tyhee Gold Corp., through its 100% owned subsidiary, Tyhee NWT Corp., commissioned a feasibility study for its Yellowknife Gold Project located in the Northwest Territories, Canada. The feasibility study was prepared by a team of consultants that included SRK Consulting (U.S.), Inc, Lyntek Incorporated, Knight Piésold and Co. and EBA,...
The environmental impacts of mining operations are currently a major focus of attention. The traditional flowchart of gold ore processing involves the use of cyanide solutions, and generates cyanide-containing tailings. There are many methods which achieve the destruction of cyanide in tailings. In many countries, the limits of environmental impact...
Subscribe to Metallurgy & Mineral Processing
SRK Worldwide