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Gold Fields faces obstacle in Ghana


Gold Fmining and milling equipment applicationsields will be unable to bring a major $700m expansion at its Damang mine in Ghana into production if the government there goes ahead with a proposal to raise corporate taxes, Tommy McKeith, the head of Gold Fields’ growth and international projects, said yesterday.


Ghana is not the only country that is changing its fiscal arrangement for mining companies. SA has proposed a R200 per ton carbon tax that CEO Nick Holland described yesterday at a presentation to analysts as something local mining companies could "ill afford". At the presentation, the management and heads of the four regions in which Gold Fields operates outlined the state of the company’s mines and growth strategies. Its plan is to reach a target of 5-million ounces either in production or in development by 2015, from 3,5-million ounces of production now. One of the main projects is the Damang Super-Pit, which will enlarge the existing opencast mine and go deeper to reach unexploited ore in a project that...

Iron ore mining at Cassinga mines in Angola may begin in next three years


Exploration at iron and manganese mines in the Cassinga mines, in Angola’s southern Huíla province, may bespring steel vibrating screen from indiagin within the next three years, the secretary of state for Geology and Mines, Mankenda Ambroise said Wednesday in Luanda.


On the sidelines of a meeting with Luxembourg’s Economy and Foreign trade minister, Jeannot Krecké, Ambroise noted that a project was underway in Cassinga to produce, transform and sell those minerals. The exploration and transformation of iron and manganese, the secretary of state said, would be carried out by a consortium made up of public and private, national and international companies. As well as the Cassinga project, in Huíla, Ambroise noted, without giving details, that there was another project in the north of Angola which would also launch iron exploration. In relation to the meeting with the Luxembourgian minister, Ambroise said that Angola was open to partnerships in the geology and mining sector in order to move ahead with its development. Luxembourg’s minister for the Economy and Foreign Trade, who has been in Angola since Monday on a four-day visit, said that his country planned to establish cooperation in the medium and long term with Angola, in the steel making sector. Jeannot Krecké is heading a delegation of businesspeople from several sectors of his country’s economy, particularly mining exploration and transformation and construction.

Canadian firm Anaconda Mining sells Chilean iron ore assets to Hierro Tal Tal


Anaconda Minincoal fired power stations in nigeriag has sold its Chilean iron ore exploration assets to Hierro Tal Tal S.A., a privately-owned Chilean company, in a deal worth up to US$11 million in cash as well as other considerations.


The company said it will use two separate payments of $2 million each to repay debt, with the second payment being made around May 31, 2012. Under the deal, Anaconda is entitled to an additional $3 million upon achievement of commercial production and up to another $4 million based on the sales price realized for certain volumes of production from the properties. The company will also earn a gross sales royalty and receive a 1.25 per cent carried interest in CPTT, a private Chilean company whose principal asset is a concession giving it the right to build a port in the city of Taltal. Anaconda's main asset is the Pine Cove mine on the on the...

Production in Africa, Orders Modular Gold Recovery Plants for Mali and Ghana


The Think Environmental Co is pleased to announce that it has placed its second order with APT for 5 sets of modular gold recovery plants with complementary equipment such as concentrators, gemini tables and impact crushers from appropriate Process Technologies (“APT), with a totagold separation from black sandsl capital expenditure of US$2.02 million. The irst gold recovery plant was ordered in April 2011.


Both the first and second orders of modular gold recovery plants will be deployed in Phase 1 of the Company’s early production programme.


Appropriate Process Technologies (or “APT”) are well renowned for simple, effective plug-andplay gold recovery plants and these plants had been installed throughout Africa and abroad in over 40 sites. The RG60, RG200 and RG800 are modular gravity gold recovery plants that employ a general flow-process of scrubbing the material to remove the clays, then sizing with screens, concentrating using a Knelson concentrator, tabling for the clean-up of the concentrate and direct smelting to produce gold dore. This simple, yet effective process can be used on weathered surface oxides, previously panned materials, river bed, mine dumps and alluvial plains. These highly energy efficient modules are intended to be deployed rapidly in remote locations due to their completely prefabricated packaging where standalone power and utilities units are built-in. The stand-alone modules are simply arranged on a pre-prepared concrete slab at site.


First Gold Production in Africa Well In Sight


With today’s order of APT modular gold recovery plants and the existing order of RG60 set well on schedule, the Company’s first gold production target by September 2011 and boosted in November 2011 is well in sight. As part of its strategy to “accelerate” gold production whilst “amassing” gold concessions, an early production programme has been in place since the very first acquisition of concessions in Mali, West Africa. The Company has set its sight on a 3,000 oz per month target to be achieved by 31 March 2012.


“Our operating philosophy has been to spring into early production as soon as a reasonable level of certainty is reached in our assessment of sites. We have applied a systematic process of ongoing assessment, evaluation and prioritization as our tenements are very large and diverse, i.e., across 16 concessions in 4 countries” said Peter Chen, Chief Operating Officer of the Company’s gold division. The Company’s assessment of potential sites for early gold production rests on several key criteria - gold grade, gold recovery, immediately available tons of material to mine and process, potential life of mine, capital payback period, geological upside, site security, accessibility, as well as environmental and social conditions.


At Keikoro, Mali and Akropong, Ghana, the Company’s geologists have performed extensive soil sampling and trenching, and sent these samples for laboratory testing, in addition to studying a multitude of data sources. Tests yielded grades of gold, ranging from 2 g/ton to 20 g/ton, based on hundreds of test results across strike trends over 5 square kilometres.


“Keikoro, Dunkwa and Akropong had been prioritized for Phase 1 of our early production programme, as they meet our assessment criteria well. We have plans to double up the order of gold recovery equipment in Phase 2 over the next 3 months as several more sites have risen in order of priority” Peter Chen, Chief Operating Officer of the Company’s gold division added.


To recap, the Company has amassed 16 concessions in Mali, Ghana, the Philippines and Mongolia. It has adopted a model of financial sustainability based on a two-pronged stategy of accelerating early production in existing mines while amassing concessions in known gold-rich regions. The Company is also in the midst of a corporate transformation which is aimed at investing in and managing entities for the exploration for and exploitation of precious and other minerals, and natural resources. The Company is in the midst of re-naming itself “Liongold Corp Ltd” to better reflect the profile of its gold mining endeavours.

WA to lock away mine boom riches in future fund


Western Austrajaw crushers in tanzanialia will plough some of its unprecedented mining wealth into a future fund it says will be worth at least $4.7 billion within 20 years and will preserve the benefits of the resources boom for future generations.


In the first move by a state government to establish a wealth fund, West Australian Treasurer Christian Porter said he would use $1.1bn of the government's rapidly growing mining royalties as seed capital for the fund, which would be quarantined until 2032.


Mr Porter rejected suggestions the money would be better spent immediately on infrastructure to sustain the boom, saying the money was at risk of being wasted on promises in the lead-up to next year's state election.


A spokesman for Wayne Swan last night said the federal Treasurer had rejected suggestions the commonwealth should also establish a sovereign wealth fund.


Mr Swan has said the government would be better off investing in infrastructure and in spreading the benefits of the boom through the proceeds of the mining tax.


The Greens have backed the creation of a national sovereign wealth fund to preserve tax revenue from the boom and limit the shock to the economy from the strong dollar. Mr Porter announced the creation of the future fund as he unveiled a projected surplus of $196 million for 2012-13 and said the state's economy was growing at a nation-leading rate of 6 per cent.


The growth is being fuelled by $270bn in projects that are either under way or being planned.


Western Australia is expecting to collect total mining royalties of $4.87bn in 2012-13, climbing to a record $6.56bn by 2015-16.


The budget included an upgrade of $300m in additional revenues that Western Australia expects to collect from its decision last year to increase iron ore royalty rates. It includes an estimate of almost $1bn in additional royalties in 2015-16 that was not included in last year's budget.


Western Australia's financial fortunes contrasted with those of Tasmania, which yesterday released a budget forecasting a deficit of $289m this financial year, a blow-out of $176m on original projections.


The upgraded forecasts in the West Australian budget present Mr Swan with a headache after he promised the big mining companies, including BHP Billiton and Rio Tinto, that he would reimburse them for all royalties they pay the states once the minerals resource rent tax starts in July.


The federal Treasurer agreed at the time to also foot the bill for any future state royalty increases.


It is unclear what effect the revised forecasts for refunds under the MRRT will have on the federal budget.


The real impact is further clouded because the assumptions that underpin the West Australian and commonwealth budgets are radically different, with the commonwealth making the assumption that the dollar will hold at $US1.03 while Western Australia assumes that it will fall to US78.9c by 2015-16.


A spokesman for Mr Swan said: "(Premier Colin) Barnett has been running around saying federal government policies are hurting the boom, yet now he's claiming a big increase in royalty receipts. It just goes to show the scaremongering has all been empty political posturing."


Mr Porter said Western Australia was responsible for 70 per cent of national jobs growth over the past year, and the state was being inundated with 1000 people a week arriving to work in the resources industry.


"What's happening in Western Australia is really quite extraordinary," he said.


Mr Porter said the state's revenues were shrinking fast as it was penalised for its success by the Commonwealth Grants Commission. WA would get only 55 per cent of its population share of national GST revenue next year, and this would decline to just 25 per cent by 2015-16.


"The federal Labor government's decision to cut WA's GST share is the single greatest economic threat to WA," he said.


But the federal Treasurer's spokesman said that when all payments from the commonwealth were taken into account, WA's share was closer to that of NSW and Victoria at 88c in the dollar.


"Mr Barnett and Mr Porter need to stop making excuses for their budget and acknowledge some facts about the degree of their commonwealth funding," the spokesman said


Mr Porter's pre-election budget held increases in electricity bills to the rate of inflation, following several years of steep rises, in an attempt to calm voter anger over the rising cost of living.


Mr Porter's second budget contained $7.6bn to be spent on infrastructure next year to fund a raft of projects, including the Perth waterfront development, a new sports stadium and a children's hospital.


Net debt will peak at $23.2bn in 2014-15 but this remains within the limits needed for WA to retain its AAA credit rating.


Mr Porter defended the creation of the future fund, saying the government was spending record amounts on infrastructure, and the best way of using the money was "not to spend it".


But the WA Chamber of Commerce and Industry said the fund was a mistake. "We believe businesses are the generators of wealth, and investing today will drive wealth for future generations far in excess of a savings vehicle that the government establishes," said CCI chief economist John Nicolaou.


"The real value of that money in 20 years won't be able to deliver much in the way of infrastructure. We're going through a phenomenal rate of growth in this state's economy, and there are infrastructure bottlenecks everywhere. We have a tax system that could be more competitive over time, and if the government invested today in infrastructure and tax relief you would achieve wealth-generation that would be far in excess of a savings vehicle."


Mr Porter said the future fund would invest only in low-risk government bonds and would be run through the WA Treasury Corporation to minimise administration costs.


The government will establish the fund by contributing $223m in savings it cut from its Royalties for Regions program and a further $820m it generated from lifting iron ore royalties last year.


Legislation to create the fund will require that at least 1 per cent of the state's annual mining royalty revenue - about $70m a year on current estimates - be put into the fund from 2016-17.


All interest earned will be reinvested in the fund, and Treasury has estimated conservatively the fund would be worth $4.7bn by 2032.


Mr Porter said future governments would be prevented from breaking into the account until 2032, after which they would only be able to spend the annual interest revenue on health, science, technology, education and cultural infrastructure.


The money would be divided roughly equally between regional and metropolitan projects.


He said the fund would be expected to earn annual returns of about 5.2 per cent.


Opposition Treasury spokesman Ben Wyatt described the fund as a desperate attempt to distract from the deterioration of the state's finances.

Lucara finds 53.5-carat diamond during first week of production at Mothae


Diamond production company Lucara Diamond Corp. has recovered a 53.5 carat, white Type IIA diamond during its firmachine for grinding of pet cokest week of production at the company's Mothae mine in the Kingdom of Lesotho. Kimberlite processing, which totals just 2,000 tonnes, commenced earlier this week and production is currently being ramped-up to the design capacity of 1,000 tonnes per day.


"Recovery of this 53.5 carat stone on initial start up at the Mothae mine is a huge win for Lucara and Mothae Diamonds. Results of initial sampling work at Mothae indicated that large diamonds are present but were being broken by the limited material size which the original bulk sample plant could process. As a single stone, this diamond is more than twice the size of any previous diamond recovered from Mothae," says William Lamb, President and CEO. In a separate release, Lucara says that its mining operations began in lay May establishing kimberlite stockpile feed for the diamond recovery plant, which...

Sentula FY profit jumps, sees better margins ahead


South African mining contractor Sentula Mmaking plaster of paris from gypsumining on Wednesday reported a jump in full-year earnings and said it also sees better margins in its current financial year. Sentula reported full-year headline earnings per share of 16.06 cents, compared with 0.6 cents the previous year, boosted by its Megacube Mining unit returning to operational profitability in the second half of the financial year.


Headline EPS is the main profit gauge in South Africa and strips out certain one-time items. "The diverse nature of the Group's earnings should continue to ensure that the underlying fundamentals support the Group's revenue base, should further volatility in global resource markets be experienced," Chief Executive Office Robin Berry said in a statement. Revenue in the year rose 10 percent to 2.4 billion rand ($354.6 million). Sentula has said margins are expected to improve in the current financial year as contracts are renegotiated based on an improving demand for mining services...

Peru to defend Newmont mining project


Environment Minister Manuel Pulgar-Vidal said that Perused jaw stone crusher for sale in usau has a "solid" argument against a precautionary measure presented to the Inter-American Commission on Human Rights, or IACHR, by organizations seeking the cancellation of the $4.8 billion Minas Conga gold and copper project.


Justice Minister Juan Jimenez is scheduled to present the state's arguments at the IACHR on Saturday, state news agency Andina reported. "I think that the Peruvian position is very solid," Pulgar-Vidal said Thursday. The request was presented to the IACHR late last year by the indigenous umbrella organization Aidesep and other civil society organizations that oppose Conga, which is majority-owned by Newmont Mining. Conga has faced stiff opposition from nearby communities due to concerns about its potential impact on the water supply in Cajamarca region, where it is located. The project was suspended in November. The government and company hope that work can restart at...

Vele`s First Coal destined for Export Market


Coal of Africa is pleased to announce that the first shipment from the Company`s Vele Colliery in Limpopo Province was loaded into 30 rail wagons at the existing Musina siding...


This first `test` shipment train of approplant for manufactring of wet ground calcium carbonateximately 1,500 tonnes of thermal coal is destined for the Matola Terminal in Maputo, Mozambique, from where it will be shipped and sold to Asian markets.


The coal was produced as part of the plant product test work that is currently being conducted on both metallurgical and thermal coal at Vele. A key objective of this test train run is to determine axle load capacity of the Transnet Freight Services line between Groenbult and Hoedspruit.


The test run is expected to confirm TFR`s capacity to commence regular, weekly trains from this existing siding and on the existing line.


The shipment coincided with the official delivery of the plant from the project engineering consultants ELB Engineering Services to Vele mine management.


Production at the Vele colliery resumed in December 2011 with the extraction of run of mine (ROM) material. Wet commissioning of the plant was completed in December 2011 and hot commissioning in February 2012. Further test work is currently being undertaken to confirm the design of processing infrastructure to enable the recovery of additional coking coal from the slimes portion of the coal, as well as the production of a secondary thermal product other than coking coal.


Speaking at the mine yesterday, Coal of Africa CEO, John Wallington, noted that this was a landmark occasion for the group. He reiterated the company`s commitment to developing a `new model` for sustainable development in the coal sector, and to ongoing consultation and interaction with all stakeholders.


In its first phase of production, Vele is expected to produce approximately 2.7Mtpa ROM production yielding approximately 1Mtpa of saleable coking coal.

Medusa Mining announces Co-O Drilling Update


Medusa Mining, through its Philippines operating company Philsaga Mining Corporation, announced an update of tsoda roast gold orehe Co-O Mine surface and underground drilling undertaken from 31 March 2012 to 30 June 2012.


Surface drilling since 31 March 2012 continues to provide resource infill and extension information for mine planning mainly to the east of the Oriental Fault, including the multiple East Agsao Veins and veins associated with the Roysan Vein. Two surface drill rigs are drilling to the west of the Oriental Fault and four on the east side of the fault.


Underground drilling continues to confirm vein continuity. Recent statistical studies indicate that 3 to 5 holes out of every 10 holes in a particular vein are required to return ore-grades to indicate that the vein will be mineable.


Peter Hepburn-Brown, Managing Director of Medusa, commented:


"The Co-O Mine drilling continues to deliver high grade intersections. These drill results are the last set of results for this financial year that will be incorporated into the annual resource estimate.


"I am pleased to report that for the first time we are achieving significant vein intersections to the west of the Tinago Fault which truncates the known veins at the western end of the mine. Whilst assays are awaited, in EXP 167 the veins are identical to the veins in the mine area. Continued success in extending the vein system westwards may have a significant positive impact on the future mine plans.


"Drilling at the current rate will continue for the foreseeable future."

Silver Miners Take Cautious Approach to Pricing Environment


Silver prices have been volatile of late as signs of a strengthening US economy has ptype of rock crushed at a quarryushed the dollar up, and taken away the metal's safe haven appeal. Meanwhile, a slowing Asian economy has led to concerns regarding industrial silver demand. The Bedford Report examines the outlook for companies in the Silver Industry and provides equity research on Silver Wheaton Corporation and Hecla Mining


Several marquee silver producers forecasted a drop in silver prices and took necessary precautions such as selling several mining sites. Many companies also increased hedging. Hedging programs allow producers to lock in current silver prices for future production, guarding against any potential price declines in the future. Banks which execute these forward sales borrow silver from the spot market, which reduces the physical supply of silver temporarily. Analysts warn that an increase in hedging could be taken as a bearish signal for silver prices as it directly...

Equipment options for stopping in gold mines

Choice of Stoping Equipment


Ideally, the hydraulic props will be Jightweight to facilitate handling and installation, and will be sufficiently blast-resistant to permit for installation close tball mill grinding mediaowards the face with no having to be removed before the blast. Preferably, the hydraulic props should be powered by plain water. Current hydraulic props demand a hydraulic pressure of 20 to 40 MPa for setting. Based on the kind of hydraulic power source used, a pressure intensifier might be necessary to enable this pressure to be attained in the prop. Appropriate compact intensifiers for insertion in the hydraulic provide line for the prop have been created for this purpose. Water-powered blast-resistant props are available commercially, but the smallest version has a 200 kN setting force, producing it relatively heavy and of unnecessarily high force for that dense assistance configuration proposed. So that you can attain the required help resistance, it really is considered that a setting force of as little as 50 kN could be sufficient with a configuration of a single prop per square metre. This would enable a lot lighter props to be used, which' will be more easily handled than these available at the moment. Being of smaller volume, these props would require less water for setting. Therefore the intensifier, if essential, may be even more compact compared to version presently accessible. Moreover to getting created for water powering, the props would need to exhibit sufficient resilience and robustness to avoid getting dislodged throughout the blast. Handful of difficulties are foreseen in the development of these units, since the essential technology is effectively established. The adoption of the dense support configuration proposed would drastically reduce the incidence of rock falls in the face, and would facilitate improved productivity of the stoping activities. However, for extreme rockburst circumstances, it might still be necessary to use heavier props with setting forces from 200 kN upwards, possibly in mixture with lighter, lower-force props.


Hand-held water jets for face cleaning have already been the topic of a specific quantity of engineering development to render them sufficiently protected, rugged, and reliable for use in stopes!. Suitable jetting guns are now obtainable to use with water at pressures which range from 9 to 18 MPa. Aside from making it achievable to handle face cleaning using the roof support program described above, the use of water jets enables a lot greater face-cleaning rates to be achieved. In trials conducted at Kloof gold mine over yesteryear three years, average monthly cleaning rates of typically 20 t/h (scraper delays included) happen to be recorded utilizing this cleaning technique, roughly twice the typical rate achieved elsewhere around the mine, where only face scrapers are used. The actual cleaning rates achievable obviously rely on panel length and on the problem and inclination with the footwall but, normally speaking, a noticable difference of a minimum of 50 % might be expected. Labour productivity can be considerably improved because the scraper does not have to be rerigged throughout the cleaning operation, and due to the fact another activity to sweep fines is no longer essential.



Conventionally, hand-held rockdrills and thrustlegs are powered by compressed air, but hydraulically powered versions operating on emulsion (98 % water) are actually available commercially. These hydraulic drills are comparable in size and mass with compressed-air drills but, due to the fact their penetration rates are considerably greater, they're capable of achieving greater than twice the quantity of holes drilled hourly. They're specifically powerful in heavily fractured ground, and are environmentally much much more acceptable because of reduced noise and removal of fog.


The drilling overall performance from the emulsion-powered rockdrills has been measured exhaustively, and Table I shows some typical outcomes obtained on various mines throughout a six-month period under various production conditions2.


The drilling rates offered in Table I are greater than twice these normally achieved with compressed-air drills. If complete benefit is taken with this. high efficiency, drilling labour productivities of as much as 100 holes per shift might be achieved regularly with one drill. In practice, values of up to 160 holes per shift with one particular drill have already been documented on occasions.


The hydraulic emulsion for these drills needs to be supplied in a pressure of 14 to 18 MPa. Emulsion pumps effective at generating these pressures are available either in a traditional form, powered electrically, or within a form generally known as the hydro-transformer in which high-pressure water is used as the driving medium. Hand-held rockdrills and thrustlegs powered by plain water are beneath improvement. A prototype version is shown in Fig. 3, and versions are required to turn out to be available commercially during 1991. With one of these, it's going to become possible to energy the drilling operations directly from the identical supply of high-pressure water as that used for props and water jets.


A widespread feature of all hydraulically powered devices handled manually in stopes, such as props, rockdrills, and water jets, is that they have to be powered through flexible high-pressure hoses connected for the powering installation. Regular hydraulic hoses do not survive effectively inside the stoping environment owing for the susceptibility with the rubber cover to cutting and abrasion, and with the reinforcing wire to corrosion. Hoses of improved style and materials have been developed specially for this application, and so are readily offered commercially.


In any consideration with the equipment and its particular method of powering for that face layout shown in Fig. 1, the type of equipment to become used within the gullies ought to even be borne in thoughts. Gully equipment is basically focused on rockhandling; conventionally, the scraper winch is used with this purpose, but the continuous scraper and loadhaul- dump car (LHD) are alternatives3. All the choices are completely compatible together with the proposed face layout. Even though scrapers are electrically powered at present, it's very possible to power them highpressure water, as well as a appropriate scraper-winch drive depending on a Pelton turbine has already been developed and proved, and is also available commercially. If face scrapers will also be powered this way, the chance then exists of powering the entire stope with water hydraulics. Using this in mind, a variety of ancillary devices (like items like ventilation fans, watering-down guns, winch signalling bells, and blasthole cleaners) continues to be created for operation on high-pressure water, enabling all external supplies of compressed air, electricity, and lowpressure service water to become eliminated from your stope if desired.


Territory reports $41m turnaround profit


Reborn iron ore producer Territory Resources has posted a $41.3 million full-year profit, representing a $112.7 million turnaround in its finawhat are the byproducts of mining leadncial performance from the previous year. Territory benefitted from improved operating performance at its flagship Frances Creek mine in the Northern Territory and a rebound in iron ore prices.


Territory came close to collapse amid the global financial crisis when a series of inter-company loans left it crippled by debt. It was thrown a lifeline late last year by Noble, which agreed to take on the company's most pressing debts. The full year profit was struck on a 54 per cent increase in operating sales revenue to $175.9 million, which reflected both a 30 per cent increase in iron ore shipments for the year to 2.027 million tonnes and a strong rebound in iron ore prices. Underlying profit for the year totalled $34.4 million. Territory said it expected its debts to Noble to be fully repaid in the 2011 financial year.

Exploration of nickel deposits in Cabo Delgado, Mozambique, to begin in 2014


Rovuma Resources is due monazite uses and economic valuein 2014 to start exploration of nickel deposits found in Montepuez , the provincial director for Mining Resources and Energy for Cabo Delgado, Ramiro Nguiraze told Mozambican newspaper Notícias.


The start of exploration of the deposits, which have estimated reserves of 23 million tons, will require a railway line to be built to transport the nickel, as well as other natural resources such as marble, as well as an increased electricity supply.


“Exploration of these resources is a big challenge for the government given that for the nickel alone the requested voltage is quite high,” said Nguiraze noting that a high voltage power line of at least 110 Kva would need to be built along with a sub-station.


Recognising that the road to Montepuez will not be able to stand up to regular transport of the nickel and marble, the provincial director said that studies were being carried out by the central government with a view to building the railway.


Nickel is a metal that has a variety of applications, specifically production of metal alloys used in the automotive and aeronautical industries.

how copper processing plant crush massive quantities of ore


Many copper concentrators all through the planet have knowledgeable troubles associated with capacity. The ability and power use of a SAG milling circuit is directly influenced by the scale of the feed towards the grinding mills along with the strength characteristics in the feed material which, during the lifetime of a mine, can display wide variations. These factors, in turn, affect the quafactory building sand handling washing screening sortingntity of circulating oversize which must be refed to the SAG mill.


Case Study


A Chilean copper mine operates one particular from the lowest grade copper porphyries to become mined in Chile. This, naturally, means how the processing plant ought to crush very massive quantities of ore in the absolute minimum expense.


The operator was experiencingproblems with concentrator capacity, due to the quantity of recirculating load to the SAG mill, using the plant currently operating 24 hours every day, an organized expansion necessary the SAGmill to use at a greater throughput than was feasible with their circuit.


Proposal


After substantial on-site testing, it was proposed a Barmac VSI crusher be installed to decrease the quantity of material being re-circulated for the SAG Mill.


Solution


The SAG mill pebbles are crushed inside a cone crusher in open circuit and also the Barmac is installed in closed circuit having a screen, following the secondary cone, to minimize the size in the feed to the ball mill. This has enabled the main SAG mill to operate in open circuit. The elimination in the recirculating load towards the major has meant a significant boost in capacity.


Other Positive aspects and Advantages


Not only did the business manage to solve their plant capacity troubles using the installation of the Barmac crusher, nevertheless they accomplished it with a relatively low capital expense. Along with this, the Barmac has proved to operate at low put on charges and with high availability, and it has the additional ability to readily absorb any surges in throughput.


The production of oversize from your SAG Mill tends to be very inconsistent and the Barmac copes with throughput variations from as little as 60 tph up to 180 tph.


Conclusion


The Barmac VSI's unique autogenous crushing and grinding action continues to be really effective in crushing the incredibly tough oversize pebbles from your mill, therefore rising the ability in the whole crushing circuit.


Major Benefits For the Copper Mining Industry


There are escalating environmental pressures inhibiting the improvement and exploitation of latest mineral deposits. This, together with all the rising fees of energy generation, has developed a world-wide trend which sees mine and processing plant lives being extended through the adoption of energy effective comminut ion processes in existing milling circuits to provide financial capacity increases and the optimisation of mineral recovery.


The Barmac VSI crusher uses a unique rockon-rock crushing process. This crushing action grinds and mills the feed material to create a fine product without any contamination from put on components. Because the material fed into the Barmac grinds and impacts against itself, the standard wear expense per tonne of material processed is really low.


Barmac Model Chosen:

- Material: Copper Ore

- Feed: -25mm

- Item: -12.5mm

- Rotor Tip Speed: 74 m/s

- Circulating Load: 50 tph

- B9600 Barmac VSI

- 300 kW (400 HP)

- Throughput: 140 tph (full capacity just isn't realised due to inconsisent feed from SAG mill)

Barmac VSI crushers will also be used inside the industrial minerals, mining, recycling and general quarrying industries. An array of materials are processed via Barmac crushers worldwide. For more info with this or other Barmac application, please make contact with your nearest Barmac representative.


Lonmin rehires 6 000 workers


Lonmin had rehired two thirds of the workers who were axed for participating in an unprotected sbornite is a copper ore used in the production of copper when heated the following reaction occurstrike two weeks ago, the third-largest platinum producer said on Friday. Lonmin said it had rehired 6 000 of the 9 000 staff whom it had fired last Tuesday at the Karee division of its Marikana mine near Rustenburg.


The workers had failed to pitch for work following internal issues at the National Union of Mineworkers (NUM). This came after the leadership of the NUM branch at the mine was dissolved, and both the secretary and the chairman were suspended from the union for failing to vacate their seats after a three-year term. Lonmin spokeswoman Tanya Chikazana said that a significant number of the 6 000 workers who had been employed by Friday were among the 9 000 workers who had been dismissed earlier in the week. Chikazana added that the mine would eventually hire a total 9 000 workers, and the employment process would be completed when the company had filled the staff complement that it needed. NUM general secretary Frans Baleni said it was regrettable that the employees had been dismissed...

ValGold to Acquire Past Producing Gold-Silver Mine in Western Ukraine


ValGold Resources is pleased to announce that it has negotiated an fabricacion correas transportadoras boliviaagreement to acquire a 75% interest in a private Ukrainian company, Klinservis - Center Ltd., which is to hold a 25 year mining licence over the past producing Muzhievo gold-silver mine and the surrounding mineral fields of the Beregovo Mining District in western Ukraine.


Under the terms of the agreement, the Beregovo mining district will be covered within one mining licence that measures approximately 75 square kilometres. The mining licence will include the primary properties such as the Muzhievo mine, and the Beregovo and Kvasovo projects. The licence will have a 25-year term. The MBK Project acquisition is subject to regulatory approval and settlement of a final Joint Venture agreement. ValGold has agreed to purchase the 75% interest in the private company established for this transaction by issuing 3.5 million common shares of ValGold and for cash of US$10.0 million dollars.

China's mineral shortages good news for Australia


China's resources minister says while his country's building up its own mining induconveyor belt manufacturers in indiastry, there will still be strong demand for overseas resources to fuel the nation's future growth.


Land and Resources Minister Xu Shaoshi told the 34th International Geological Congress in Brisbane that while China had strong supplies of some minerals such as tungsten and tin, it was short in other areas such as iron ore.


“Given the unequal distribution of resources, there are very few nations that can meet all their own minerals requirements,” he said.


“We will rely first and foremost on our own resources and will step up our domestic production of minerals.”


Mr Xu is leading a Chinese delegation of 700, easily the largest contingent at the conference, which is held every four years. This is only the second time it has been held in Australia.


Mr Xu said the conference was important in the context of a “sluggish world economy, a sluggish US economy, and sovereignty issues in Europe, which have the potential to affect the economic growth of China”.

Mining recommences at Eloise Copper Mine, Queensland


Breakaway Resources Limitedhas announced the recommencement of underground mining operationsat thquarry company in chinae Eloise Copper Mine, located 70 kilometres south-east of Cloncurry in North West Queensland. Eloise is 100%-owned and operated by FMR Investments Pty Ltd, while Breakaway has 30% net profit interest in the mine.


FMR advised last year that it intended to restart mining operations at Eloise, which has been on care and maintenance since December 2008 – when a localised hanging wall rock failure coupled with low copper prices at the time saw mining activities terminated in order to maximise the mine’s future value. While Breakaway does not factor in any payments from its 30% net profit interest for the 2011 calendar year, the re-opening of Eloise coupled with strong copper prices and the robust outlook for the copper market provides significant impetus to “kick start” forthcoming copper exploration programs on Breakaway’s 100%- owned Eloise Exploration Project, which lies adjacent to the mine.


Breakaway has identified multiple bedrock high-grade copper targets on the Eloise Exploration Project within a 20km radius of the Eloise Copper Mine and milling facility. The targets are typically characterised by +1% copper intercepts (up to 4.7% copper), highly anomalous gold results and limited deep drilling – with excellent potential to extend the known mineralisation along strike and
down dip. In addition, there are several significant surface geophysical and geochemical anomalies in close proximity to the bedrock targets which also represent attractive targets for follow up.


Breakaway is now preparing to commence ground-based follow up of the targets in early 2011 after the northern wet season ahead of likely geophysics and drill testing in the June and September Quarters of 2011.

Zimbabwe mining agency head denies bypassing treasury in revenue move


Zimbabwe Mining Development Corporation Chairman Godwills Masimirembwa has responded to critmanganese ore beneficiation plantics who say his state agency bypassed Treasury channels in paying out diamond revenues to allow for an increase in civil service salaries.


In remarks published Monday in the state-controlled Herald newspaper, Masimirembwa said he did not circumvent rules in remitting funds to the state as has been charged by some in the Morgan Tsvangirai wing of the Movement for Democratic Change. Such critics accused Masimirembwa's agency of transferring funds directly to the Salary Services Bureau rather than to the Treasury for eventual remittance to public workers. Treasury sources said they had no knowledge of the US$40 million in proceeds from Marange diamond sales made available to fund increased civil service salaries. Sources said it was unlikely the funds would not have been detected by the Treasury. Neither Finance Minister Tendai Biti nor Masimirembwa was available for comment. Political and economic commentators said the ZMDC should follow proper channels and procedures in the handling of revenues from the controversial Marange diamond field...