Knelson
E-Newsletter
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Improvements in Gravity and Overall Gold Recovery at NVI Mining Ltd. Myra Falls Operation |
- April 18, 2006 NVI Mining’s Myra Falls Operation is a 4,000 mtpd copper/zinc flotation circuit with by product
gold of ~28,000 ounces per year. Gold recovery has historically averaged 40-55%, however, a
portion of this was recovered in the zinc concentrate and received poor payment. Two Knelson
CD-30 Concentrators have been operating in the grinding circuit since 1992, with gravity
recovery averaging about 2-5% over that time period. Read more. | |
| Boliden Bolsters Gold Recovery with Knelson Concentrators |
- November 4, 2005 Boliden Odda AS was established in 1924 and quickly became one of the world’s leading producers of zinc. Prior to the start of World War II, Boliden was producing 46,000 tonnes of zinc annually. The disruption caused by the war dropped production dramatically, however, over the decades following the war the company experienced dramatic growth and by the mid-1980’s annual zinc production hit 140,000 tonnes. Read more.
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The Introduction of a Gold Gravity Circuit at the Bimak Copper Concentrator, Bulgaria
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- June 1st, 2004 (archives) Previous mineralogical investigations at Bimak had shown that approximately 10% of the gold in the ore could be liberated. This paper details the initial testwork and the installation of Knelson concentrators at Bimak AD, Bulgaria. Read more.
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Developments in Gravity Concentration Circuit in Ashanti Goldfields Company, Obuasi
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- May 7th, 2004
Increasing importance has been given to gravity concentration systems at AGC Obuasi plants and significant developments have recently been achieved. The achievement has improved free gold recovery from 8% to 16% of the total gold recovered at the Pompora Treatment Plant (PTP) and the elimination of the nugget effect has significantly improved metallurgical accounting. Read more. |
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Gravity Circuit Optimisation via Mathematical Modelling by Particle Size Classes
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- April 28th, 2004
Many factors affect the overall performance of a gravity circuit beyond that of the primary gravity recovery device. It is critical to examine the gravity circuit in its entirety in order to determine the dominant operating variables that affect overall performance. Knelson has developed KC-MOD*Pro; a mathematical model of gravity circuits. The KC-MOD*Pro model has been used to assist in the design of gravity circuits, and in particular, in making accurate predictions of plant scale gravity recovery. Read more. |
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eXtreme Processing - Maximum Benefit for Minimum Effort
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- March 25th, 2004
The advent of continuous gravity technology affords the opportunity to capture not only the free liberated gold, but also the gold carrying species into a small, high-grade concentrate. This concentrate can then be treated under more intensive conditions in a small, dedicated plant for maximum recovery. The benefits are obviously lower capital plant installation costs and lower operating costs since only a fraction of the ore is treated. Knelson Gravity Solutions has coined the term "eXtreme Processing" to describe a processing system comprising of....Read more. |
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Recent Gravity Improvements at the Porcupine Joint Venture
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- February 1st, 2004
Since milling began in 1912, the Dome mill, now part of the Porcupine Joint Venture (PJV), has been expanded several times. Over the past few years, continuous gravity improvements have increased the gravity recovery from 20% to nearly 50% of the plant feed. This paper describes some of the factors that have contributed to this dramatic increase, and suggests how gravity recovery can be further improved. Read more.... |
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Gravity Leaching with the ConSep ACACIA Reactor
Results from Anglogold, Unions Reefs
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- December 11th, 2003
This paper has particular focus on the ConSep ACACIA Reactor's role in removing slow leaching components from data generated over a 21-month period. Benefits of the ACACIA are also discussed, such as the enhancement of the dissolution kinetics, enhancement of the absorption kinetics, reduction of the gold load reporting to the carbon, significant reduction of the 'gold in circuit' lockup and more. Read more.... |
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Knelson Concentrator Aids in Processing Shift From Silver to Gold Production
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- October 7th, 2002
ARCHIVED PAPER (1997) - The Kinross DeLamar Mine was in operation for more than 17 years producing precious metals dorй from ores, principally silver bearing with associated gold co- products. In late 1995 a new ore-body was commissioned, the Stone Cabin ore-body, and the site began a phased shift from silver dominance to gold dominance in terms of precious metals revenue. The Knelson Concentrator was selected to remove gold....Read more. |
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Leaching Gravity Concentrates using the ACACIA Reactor
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- July 3rd, 2002
This paper discusses the gravity concentration at Union Reefs Gold Mine, testing of a pilot scale ACACIA Reactor, design considerations, process description, the process flowsheet, engineering and construction, commissioning period and the operating results. Read more.... |
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Gravity Leaching - The ACACIA Reactor
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- May 14th, 2002
Gravity Leaching of high grade gravity gold concentrates, such as Knelson Concentrates, with the ConSep ACACIA Reactor represents a new generation of concentrate treatment methods. The ConSep ACACIA Reactor is a complete packaged plant for the maximising of gold recoveries from gravity gold concentrates. This paper will introduce the process technology and provide process results from the Porgera ConSep ACACIA Reactor installation. Read more.... |
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Gold Gravity Recovery in Copper Circuits at BHP Mine
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- March 8th, 2002 - Re-post
TINTAYA, Peru - During the first 12 months of operation of the Knelson-based gravity circuit, BHP Tintaya produced over 200 tonnes of gravity gold concentrate....Read more. |
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Share Your Knelson Experience
"Although I have been using jigs as the principal means of recovering gravity gold in milling circuits since 1964, recent work here in Brazil with the 3", 6" and 20" Knelsons at our plant (Rio Paracatu Mineraçã) has convinced me that Knelson is the way to go in future installations."
- Jock Clark, Consultant Metallurgist - Rio Tinto Brasil, Brazil
... more > >
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