Processing Solutions - December 2017

Newcrest Buys Eriez Flotation Equipment, Mexican Producers Choose FLS NextSTEP

Eriez Flotation Division (EFD) and Eriez-Australia have been selected to supply Newcrest Mining’s Cadia Valley Operations in New South Wales, Australia, with proprietary separation equipment that will be utilized to recover gold and copper from a concentrator tailings stream. The EFD equipment order includes two HydroFloat Separators and four CrossFlow Classifiers.

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Copper Producer Upgrades Valve Control Equipment

ATI, a Texas, USA-based integrated manufacturer of valve automation solutions, has begun the task of replacing 42 existing linear valve actuators with its newest model at an open-pit copper mining operation in Arizona. The new double-acting actuators are constructed with a 14-in. bore and 23-in. stroke in modulating service of shaft-mounted DART valves for flow control in the operation’s open top slurry separation process.

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DRA to Design,Construct Tailings Plant

Multidisciplinary international engineering group DRA has been appointed by JSE-listed Pan African Resources to deliver a detailed design and construction supervision service for the Elikhulu Gold Tailings Retreatment Plant facility planned for its Evander operation in Mpumalanga, South Africa.

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Processing Solutions - November 2017

New Crusher Design Combines Low Profile With High Output

A new crusher recently unveiled by thyssenkrupp is expected to “revolutionize” material processing in both underground and surface operations, according to the company, which describes its ERC25-25 series model as a quantum leap in primary crushing.

thyssenkrupp said the first model to be released can provide throughput of up to 3,000 metric tons per hour (mt/h), and the line will be supplemented with additional models to enable both smaller and higher throughput capacities.

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Ore Sorting Tests Point to Process Efficiency

Dalradian Resources, a Canadian junior exploration and development company, announced positive ore sorting test results based on a bulk sample of mineralized development material from several of the veins at its Curraghinalt gold project in Northern Ireland. Testing was carried out by Outotec at their TOMRA sorting test facility in Wedel, Germany, on approximately 5 metric tons (mt) of material grading 9.52 grams/mt of gold. Using X-ray and laser technology, plus additional screening prior to processing, the amount of non-mineralized material that would be sent to the mill in an operating mine was reduced by 35.8% and the grade increased by 54.6% to 14.72 g/mt of gold with a gold recovery of 99.3%.

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Heron Finds Grinding Solution for Woodlawn Plant

Heron Resources has selected IsaMill grinding technology for its Woodlawn zinc-copper project, located 220 kilometers (km) southwest of Sydney, New South Wales, Australia, at the site of the former Woodlawn mine, which contains reclaimed tailings and underground mineral reserves.

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Processing Solutions - October 2017

Future-proofing Potash Mining: The Need for Intelligent Operations

Ten billion tons of potash reserves. Put another way, reserves that exceed global annual production by more than 300 times.

And it’s what a large potash operation in Eastern Europe must find a way to extract and process in the most efficient manner possible. At these large volumes of material, the company needs to ensure that operations move that potash quickly and reliably throughout their facility.

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Metso’s Safer, Faster Screen Panel Attachment System

Metso has introduced a new attachment system for its Trellex screening media that it claims offers increased productivity and makes media change-outs safer and faster than with traditional systems.

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Processing Solutions - September 2017

Skimping on Crusher Maintenance Costs More in the Long Run

Eric Jones, global service director of comminution aftermarket for Weir Minerals, recently offered some useful guidelines and suggestions for ensuring top performance from crushers.

Jones, noting that crushers operate at high power, force and capacity in order to produce the required material, explained that this puts a great deal of strain on the crusher and its wear parts, which operators must be aware of when carrying out maintenance. Failure to do so may have a high impact, both in terms of financial cost and potential loss of production. His suggestions cover:

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Water Treatment Optimization through Innovation

The importance of water conservation and management in mineral processing can be expressed in a few short sentences that resemble circular logic: Water is an integral part of mining. Ore processing is water intensive and results in the production of tailings. The recovery of water from tailings is essential to mining operations, especially in arid climates with scarce water sources. Chris Biederman, senior engineer and technology development lead in the Water & Natural Environment Business Unit at engineering firm Hatch, recently described in an online blog post (www.hatch.com/en/About-Us/Publications/Blogs/2017/05) how Hatch has learned to use bench-scale testing to assist in quick and efficient formulation of optimum strategies for recovering and, if necessary, treating water from typical mine-site sources such as a Tailings Management Facility (TMF).

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Web-based Modeling to Improve Ball Mill Performance

Metcom Technologies recently launched the Streamline ball mill circuit modeling system, described as the first-ever web-based application which uses Functional Performance Analysis to carry out circuit performance improvements.

Metcom’s chief metallurgist, Robert McIvor, said, “This system has been specifically developed to empower the plant metallurgist and others working with ball mill circuits to make circuit modifications and realize valuable performance gains.”

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