Archive | Nickel

Surging costs delay Sherritt [Madagascar Ambatovy nickel] project – by Brenda Bouw (Globe and Mail – June 15, 2011)

The Globe and Mail is Canada’s national newspaper with the second largest broadsheet circulation in the country. It has enormous impact and influence on Canada’s political and business elite as well as the rest of the country’s print, radio and television media. Brenda Bouw is the Globe’s mining reporter.

Sherritt International Corp. is the latest in growing list of mining companies to report double-digit cost increases and project delays resulting from surging prices for energy and raw materials.

Toronto-based Sherritt said the total cost of its 40-per-cent owned Ambatovy nickel-cobalt project in Madagascar is expected to rise 16 per cent to $5.5-billion (U.S.). Production, set to begin this summer, is now delayed until the first quarter of next year.

“We find this embarrassing and painful,” Sherritt chief executive officer Ian Delaney told investors on a conference call Tuesday. Sherritt’s stock fell 6 per cent on the Toronto Stock Exchange on Tuesday, its lowest level since last summer.

Rising costs are becoming a huge hurdle for miners as they rush to boost production and capitalize on global demand and metal prices while they remain strong. Continue Reading →

Bucko Lake Canada’s Newest Nickel Producer – by Marilyn Scales

Marilyn Scales is a field editor for the Canadian Mining Journal, Canada’s first mining publication. She is one of Canada’s most senior mining commentators.

Canada’s newest nickel producer is the Bucko Lake mine near Wabowden, MB. The mine, which belongs to Toronto’s Crowflight Minerals, shipped its first concentrate on Feb. 12, 2008, to Xstrata’s smelter Sudbury, ON.

The initial concentrate shipment weighed of 90.0 tonnes and contained 11.5 tonnes of nickel. Full commercial production is expected early in Q2 2009.

The Bucko Lake deposit was first investigated by Falconbridge, and a 340.0-metre-deep shaft was sunk in 1971-72. The mine is designed for longhole open stoping with sublevel access on 30.5-metres intervals. The intervals are connected via an internal decline. Backfill consists of cemented hydraulic material and development waste.

Underground mining began late last year in the first high-grade stope area on the 1,000 level (305 metres). Lower grade stopes on the 1,000 level are also being mined, and the high grade stope area on the 900 level (275 metres) is now being developed. The main ramp has been driven approximately 115 metres vertically from surface. Some ore development and crown pillar support activities will occur from the 450 level (135 metres), which should be reached late in the first quarter.

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A History of Sherritt – Fifty Years of Pressure Hydrometallurgy at Fort Saskatchewan – by M. E. Chalkley, P. Cordingley, G. Freeman, J. Budac, R. Krentz and H. Scheie (Part 5 of 5)

Application of Sherritt’s Pressure Hydrometallurgical Technology to Other Metals

Much of Sherritt’s metallurgical and product technology developed over the last 50 years can be traced back to work done during the development of the ammonia leach process.  Pressure leaching of sulphide ores and concentrates, using continuous horizontal autoclaves, provided the basis for a thriving pressure hydrometallurgical process licensing business which offered processes for treating nickel mattes and concentrates, zinc concentrates, and refractory gold ores and concentrates.  The nickel reduction process perfected in the Ottawa pilot plant was subsequently licensed worldwide.

During the early 1950’s, following the successful commissioning of the nickel refinery at Fort Saskatchewan, Sherritt utilized its laboratory and pilot plant facilities in Ottawa to look for other potential applications for pressure leaching processes in the metals industry (14).  Laboratory tests were carried out on the pressure leaching of uranium ores and on the pressure oxidation of refractory gold ores, where the oxidative pressure treatment proved an excellent method for oxidizing pyrite and arsenopyrite to liberate the gold for subsequent recovery.

Two additional leaching plants were built by Chemico to treat cobalt concentrates in the aftermath of the Korean War, when the cobalt price was artificially high, but both plants became uneconomic as the price of cobalt declined, and closed in the early 1960s.  A fourth pressure leaching plant was the Port Nickel plant, constructed by Freeport to treat the nickel-cobalt sulphide from Moa.

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A History of Sherritt – Fifty Years of Pressure Hydrometallurgy at Fort Saskatchewan – by M. E. Chalkley, P. Cordingley, G. Freeman, J. Budac, R. Krentz and H. Scheie (Part 4 of 5)

Pressure Hydrometallurgy at Moa

The acid pressure leach process for the treatment of low magnesium content lateritic ore has been in operation at the Pedro Sotto Alba plant in Moa, Holguin, Cuba since 1959.  The plant was originally constructed by Chemico for Moa Bay Mining Company, a subsidiary of Freeport Sulphur, but was taken over by the Cuban government in 1960.  The plant recommenced operations in 1961, under Cuban management.

Under Cuban management the production at Moa gradually increased and improvements were made to the recovery of nickel and cobalt.  In December 1994, Sherritt Inc. and General Nickel Co. S.A. announced the formation of a combined enterprise that included the Moa plant, now known as Moa Nickel S.A.   The nickel and cobalt sulphides produced by Moa Nickel S.A. (13) are transported to the nickel and cobalt refinery at Fort Saskatchewan, Alberta, Canada now known as “Corefco” (The Cobalt Refinery Company Inc.), a second combined enterprise company, for processing to pure metal products.

At Moa, Nickel limonite ore is processed in a high-pressure acid leach to selectively dissolve nickel and cobalt from the ore.  Concentrated sulphuric acid is the lixiviant.

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A History of Sherritt – Fifty Years of Pressure Hydrometallurgy at Fort Saskatchewan – by M. E. Chalkley, P. Cordingley, G. Freeman, J. Budac, R. Krentz and H. Scheie (Part 3 of 5)

History and Development of Cobalt Production

As Sherritt was developing the hydrometallurgical process for refining nickel, they were also faced with the question of how to separate cobalt from nickel, and then what to do with the cobalt.   The selection of hydrogen reduction technology to produce metallic nickel powder also provided Sherritt with a primary nickel-cobalt separation step.  As long as the ratio of nickel to cobalt is large, nickel can be selectively reduced with hydrogen without reducing cobalt.

The Lynn Lake concentrate, with typical ore grades of 10% nickel and 0.5% cobalt, yielded nickel reduction feed solution with relatively low cobalt content (nickel/cobalt ratio greater than 30:1).  Since the relatively small amount of nickel and cobalt remaining in the solution after nickel reduction could be precipitated from solution with hydrogen sulphide to yield a saleable intermediate nickel-cobalt sulphide product, development and construction of the nickel refinery was able to proceed without a final answer as to how to handle the cobalt.

Many alternative cobalt flowsheets were studied.  The Ottawa pilot plant was closed in 1955 and some of the pilot plant equipment was shipped to Fort Saskatchewan where it was used in the assembly of a “commercial sized” cobalt refinery.   Output of this plant, at less than 150 tonnes of cobalt per year, was so low that it was only utilized for commercial cobalt production for part of the year, and used for pilot scale development of other hydrometallurgical processes during the remainder of the year. Refining of nickel-cobalt sulphides, utilizing an acid leach of the sulphides, began on June 16, 1955.

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A History of Sherritt – Fifty Years of Pressure Hydrometallurgy at Fort Saskatchewan – by M. E. Chalkley, P. Cordingley, G. Freeman, J. Budac, R. Krentz and H. Scheie (Part 2 of 5)

THE FORT SASKATCHEWAN REFINERY

Commissioning

Leaching of concentrate started on May 24, 1954.  By June 19, the leach circuit was filled and by July 15 feed liquor was available for the metal recovery section.  On July 21, 1954, the first nickel metal was produced and met specifications.  The plant reached 90% of design capacity by the end of 1954 and operated at design capacity during 1955.

Ongoing Development of the Ammonia Leach Process

Through the years, as feed sources to the refinery changed and developments were made and implemented, the configuration of the leach stages and autoclaves was altered many times.  However, the basic function and operation of the ammonia leach has remained remarkably constant.  The dissolution of metal values combined with the simultaneous oxidation of sulphur forms the basis for the chemistry of the ammonia leach.

In the ammonia leach nickel, cobalt, copper and zinc are leached into solution.  Iron, if present in reactive form, upon dissolution is immediately hydrolysed and precipitated as hydrated iron oxide.  The iron oxide tailings are removed by thickening and filtration and discarded.  Sulphur chemistry is complex, as sulphur may exist as any of several intermediate oxidation states as well as the fully oxidized ammonium sulphate and sulphamate.

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A History of Sherritt – Fifty Years of Pressure Hydrometallurgy at Fort Saskatchewan – by M. E. Chalkley, P. Cordingley, G. Freeman, J. Budac, R. Krentz and H. Scheie (Part 1 of 5)

INTRODUCTION

The Beginning

In July 1927, Sherritt Gordon Mines Limited was incorporated, and named after Carl Sherritt and the Gordon family.  Carl Sherritt was an American citizen who worked as a teamster on the construction of the Hudson’s Bay railroad.  He later became a trapper and prospector and staked copper prospects in the Cold Lake area of Manitoba.  J. Peter Gordon was a civil engineer who also worked on the railroad construction and later became interested in mining developments in the area.

The formation of the company was largely due to the efforts of Eldon Brown, a young mining engineer, with the financial backing of Thayer and Halstead Lindsley and the Gordon family (1).

The Discovery of Nickel at Lynn Lake

In 1941, a Sherritt Gordon prospector named Austin McVeigh sampled an outcrop of sulphide-bearing rock near Lynn Lake that assayed 1.5% nickel and 1.0% copper (2).  It was wartime and Sherritt Gordon could neither afford the men nor the equipment necessary to stake and drill the area.  The discovery was kept secret until after the war.

In the summer of 1945, McVeigh started staking in a six mile square area which covered all of the known magnetic anomalies and McVeigh’s original nickel-copper find.  A diamond drill was flown in but drilling on the strongest magnetic anomalies found only magnetite.  In September, the drill was moved to test several weak magnetic anomalies close to Lynn Lake and by the end of the month, an intersection with good ore grade had been made.

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The Greening of a Convention Centre with Nickel – by Carroll McCormick

The following article was first published in Nickel, the magazine devoted to nickel and its applications.

Sustainable Benefits of Austenitic Stainless Steel Roof Includes Energy Savings

The roof over your head does more than keep the elements out. Properly insulated, it also keeps heat in during the winter months and out in summer. Nickel-containing  S30400 stainless steel is a poor conductor of heat and therefore can help to insulate a roof and make a building more energy-efficient. Architects who choose it as a roofing material may soon be able to take advantage of this and other properties of stainless steel in the Leadership in Energy and Environmental Design (LEED) certification system.

When the David L. Lawrence Convention Center in Pittsburgh, Pennsylvania, opened in 2003, it was the largest building in the United States to earn a Gold Certification under the LEED system. The Gold LEED status recognizes the centre’s brownfield redevelopment, accommodation of alternative transportation, reduced water use, efficient energy performance, use of materials that emit no or low amounts of toxins, and innovative design. Had the sustainable attributes of nickel-containing stainless steel been fully accounted for under LEED, the certification could very well have been platinum, says Catherine Houska, senior market development manager with Pittsburgh-based TMR Architectural Metals Consulting and a consultant to the Nickel Institute.

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Nickel Plays an Enormous Part Reducing Greenhouse Gas Emissions Around the World – Patrick Whiteway

Patrick Whiteway is the editor of Nickel, the magazine devoted to nickel and its applications.

Primary nickel production is energy intensive but, put in perspective, it accounts for less than one-tenth of one percent of global greenhouse gas (GHG) emissions. That makes us a small part of the problem.

By comparison, nickel is used in a multitude of innovative applications that are reducing greenhouse gas emissions worldwide.

As a sponsor of Climate Action, a joint project launched by Sustainable Development International in partnership with the United Nations Environment Programme, the Nickel Institute is engaged in constructive dialogue with both government and the private sector. The goal is to find ways to reduce greenhouse gas emissions even further.

The Institute’s president, Stephen Barnett, recently spoke on camera with a reporter for Climate Action and outlined how the nickel industry is contributing to a more sustainable society. Continue Reading →