• The World's 20 Largest Copper Mines

     · The Morenci mine in Arizona is the largest copper mine in North America. Operated by FreeportMcMoRan, the mine is jointly owned by the company (72%) and affiliates of the Sumitomo Corporation (28%). Morenci operations began in 1872, underground mining began in 1881, and openpit mining began in 1937.  

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  • COSTS AND COST ESTIMATION Chapter

    , The number of mine personnel required in open pit mines may be estimated from the following formulas in which Nap is number of open pit personnel and Tp is tons of ore and waste mined daily. Nap = for open pit mines in hard rock using shovels and trucks for loading and haulage of ore and waste ()

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  • 4 Coal Mining and Processing | Coal: Research and ...

    The cost per ton of mining coal by surface methods is generally lower than that by underground methods. In the United States, in addition to a continuous growth in coal production since the 1960s, there has been a dramatic shift in production from underground mining to surface mining . In the Powder River Basin (PRB), where deposits of coal ...

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  • Uranium Mining Overview

    TradeTech has compared the cost profiles of a number of uranium mines for reporting their C3 operating costs per unit of output. In particular the comparison between open pit and in situ leach (ISL) operations is interesting. It shows that for ISL mines, almost half the C3 cost is capital in setting up the operation, another quarter is ...

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  • Truck Haulage

    Open pit mines employing truck haulage typically have haulage costs that are 1050% of the mining cost. A well designed and maintained road network has can substantially reduce the operating costs and the need for capital replacement by extending the life of existing haul trucks and reducing the hours required to move the required amount of ore and waste.

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  • Rare earth mining in China: the bleak social and ...

     · Its largest openpit mine is 1,000 metres deep and spans 48 sq km; in satellite images by Nasa released in 2012, it appears as one of many massive black craters dwarfing a sprawl of .

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  • Determining Stripping Ratio

     · CW = stripping cost per tonne of waste (NB: These Initial may vary from person to person depending on their own preference) For example: Determine the BESR in mining and processing a % copper ore deposit if the selling price of copper in concentrate is /kg and the overall unit costs are /ton and the cost of handling unit weigh of waste is /ton. The overall recovery is .

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  • Productivity and Cost Management

    "In the broader mining industry, the opportunity cost of not producing a unit of production during this high price period meant that most miners took a "volume over cost" approach; the benefits of being able to produce more outweighed the increased costs that resulted" Marius Kloppers, CEO BHP Billiton Presentation to Brisbane Mining Club, 17 October 2012 "We are right at the bottom ...

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  • Mineral Processing Operating Cost Estimate of Ore Treatment

     · The 596,482 tons milled yielded per ton at a total cost of per ton of which was milling cost. COSTS ON THE RAND. The distribution of costs at Randfontein Estates Gold Mining Co., which is typical of the older sandslime type of plant, is shown in Table 100.

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  • ECONOMIC ASSESSMENT AND MINE PRODUCTION .

    Surface mining operations involve high levels of complexity and uncertainty that last for many years and require huge capital investment and risk. Each openpit mine is unique, based on the physical characteristics of the ore deposit and on the operational parameters of the

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  • Cost Per Tonne | Logging Operations | Tiger Forest ...

    Simply put, cost per tonne is the total cost of your logging operation divided by your total production. The concept is easily represented as a mathematical equation: Cost per tonne = Total Cost () ÷ Total Production (tonne) Calculating cost per tonne Unfortunately, the process leading up to plugging numbers into this simple formula can be complex and daunting. So how do you figure out what ...

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  • Estimation of the potential production rate ...

    If mining cost growth rate is expected to be high, the optimal production rate is should also be high to avoid higher mining costs in later years. The final factor considered was the cost of capital (discount rate). It was found that for a low (~5%) and high (~35%) cost of capital, the production rate should be low, however between these points of cost and capital, the production rate should ...

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  • Cripple Creek Victor Gold Mine

    The mine is a lowcost, lowyield open pit operation, with grades well below one gram of gold per tonne of ore. In recent years, 2008 and 2009, the mine accounted for 5% of AngloGold Ashanti's worldwide production. It is the company's only active operation in the United States. In 2008, the State of Colorado and Teller County granted the mine a minelife extension. ...

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  • Abstract

    Electrical costs are a small cost component for the open pit mine models and are included in the construction material egory. Note that capital costs are expressed in dollars and operating costs in dollars per short ton of material (ore and waste) mined. All costs are based on daily capacity of the mine (X) in short tons per day of material (ore and waste) moved. Figure 2 summarizes the ...

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  • open cast gold mining cost per ton

    Cost Models of Theoretical Mining Operations CostMineMining Cost Models Free Data for Mine ... included in a Mining Cost Service: Open Pit, Underground, Placer, Milling Heap Leach. 5,000 Tonnopen cast gold mining cost per ton

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  • Operating Costs, AISC | Mining Data Online

    Open Pit. Underground. Combined. Direct. Processing. Total. Asset Mine Project CurrencyCode Commodity Cash Costs Total Cash Costs AISC Allin Costs Currency Mining OP Mined UG Mined Blended Op/UG Mined OP Milled UG Milled Blended Op/UG Milled Direct Processing Total Milled..... USD. Gold ; 562 /oz; 893 /oz..... USD. Copper; /lb..... USD. Copper; /lb..... USD. Gold; 496 .

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  • 3 Technologies in Exploration, Mining, and Processing ...

    Large openpit copper mines can produce up to a million tons of waste and ore per day and can be mined at that rate for decades. Quarrying is similar to openpit mining except the term is commonly applied to the extraction of dimension stone and aggregates. Fewer benches are required in quarrying than in openpit metal mining

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  • These 10 mines will set the copper price for the next ...

    In 2014, the current open pit operation produced of fine copper in hode and copper concentrate and molybdenum, 757t gold, silver and million tonnes of sulphuric acid at C1 copper cash costs of approximately /lb. Current mine reserves stand at Bt grading % copper. The mine operates as an open pit but underground construction began in late 2011 .

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  • chap

    waste cost/ton stripping pit Open ore cost/ton mining pit Openore cost/ton mining d Undergroun BESR = tons waste:1 ton ore Only that part of the orebody where the stripping ratio does not exceed tons waste: 1 ton ore should be mined by open pit methods. For this reason it is necessary to update the longterm plan of the mining project at regular intervals.

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  • Chapter 7 Energy Use in the Copper Industry

    5 cents per kWh. 8Robert Wyllie, "InPit Crushing Still Gaining Ground in Open Pit Mines,"Engineering and Mining Journal, June 1987, pp. 7680. 9See the discussion of comminutionin ch. 6. Table 73.—Effect of Varying Cutoff Gradea Cutoff gradeMillhead gradeTons milled Million Btu/ton hode copper produced

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