Copper heap leach development not as easy as it looks

Aug 04, 2016· The ability to use heap leaching, together with solvent extraction and electrowinning (SX/EW) to go from ore to high grade metal at the mine-site, makes it

Heap leaching Wikipedia

The mined ore is usually crushed into small chunks and heaped on an impermeable plastic or clay lined leach pad where it can be irrigated with a leach solution to dissolve the valuable metals. While sprinklers are occasionally used for irrigation, more often operations use drip irrigation to minimize evaporation, provide more uniform distribution of the leach solution, and avoid damaging the exposed mineral. The solution then percolates through the heap and leaches both the target and other minerals. This process, called the "leach cycle," generally takes from one or two months for simple oxide ores (e.g. mo

Heap Leach: Mining's breakthrough technology MINING.COM

Aug 20, 2015· Copper Heap Leaching (Solvent Extraction-Electrowinning SX-EW) In 2014, more than 50 major HL-SX-EW operations worldwide recovered approx. 3 million tonnes of copper, which represents roughly

Gold Heap Leach Cost Guide Costmine

The Gold Heap Leach Cost Guide brings all the pertinent costs for gold heap leaching into one convenient reference. The guide provides estimators, engineers, investors and accounting professionals with cost estimating models for mining, heap construction and placing, gold recovery, and reclamation.

Heap leaching: Could it be an alternative to conventional

Dec 12, 2019· Heap leaching is widely used in modern large-scale mining operations as it produces the desired concentrates at a lower cost compared to conventional processing methods such as flotation

Copper Mining and Processing: Processing of Copper Ores

Copper processing is a complicated process that begins with mining of the ore (less than 1% copper) and ends with sheets of 99.99% pure copper called cathodes, which will ultimately be made into products for everyday use.The most common types of ore, copper oxide and copper sulfide, undergo two different processes, hydrometallurgy and pyrometallurgy, respectively, due to the different

Leach pad cost benchmarking 911metallurgist

The cost of construction of the leach pad is an important part of the total capital cost of any heap leach project, whether a green-field development or expansion of an existing operation. The authors present and discuss costs from 48 phases of work on 28 heap leach projects in 8 countries, including North and South America, Africa and Asia.

Heap Leaching Mineral Processing & Metallurgy

Metallurgical ContentHeap Leaching Copper OresIngress of Solutions into OresSurface TensionSolubility of Gas in VoidsTemperatureVarious SolutionsManner of PenetrationDissolution of Various Copper MineralsLeaching Oxidized MineralsCuprite LeachingLeaching ChalcociteBornite LeachingCovellite LeachingChalcopyrite LeachingRemoval of Soluble Copper from Leached OresConclusionsHEAP LEACHING

Application of SART to Heap Leaching of Gold-Copper

a heap leach operation. Given increasing levels of cyanide complexed copper in current pregnant solutions from Maricunga heaps (over 300 ppm Cu), there is a need to reduce these levels and decrease cyanide consumption and cost. Additionally, a means of disposing of this copper is required, preferably as a saleable product. The well

Sulfuric acid injection in copper heap leaching LEWA

The leaching reagent (dilute sulfuric acid) is sprayed through sprinklers on top of the heap pile and allowed to trickle down through the heap, where it dissolves the copper from the ore. The resulting solution of sulfuric acid and copper sulfate is collected in a small pool. Copper concentration is around 65%. Next step is solvent extraction.

Dump and Heap Leaching Hydro-Jex

for successful heap leaching of gold and copper are provided in the chapters on gold, silver, and copper hydrometallurgy elsewhere in this handbook. Other metals of interest in heap or dump leaching include uranium, nickel, cobalt, zinc, and recently, some rare earth elements. Of these, uranium heap leaching has had the most attention.

New breakthrough copper recovery process developed by FLSmidth

Nov 09, 2018· These costs are further reduced by optimising the volume ratio between the stirred leach tanks and the reactors. Indeed, the full-scale FLSmidth ROL processing costs are estimated to be only marginally above the cost of stirred-tank leaching of secondary copper sulphides.

A Brief Note on the Heap Leaching Technologies for the

Heap leaching is a low-cost technology used in industrial mining to recover precious metals such as gold and uranium, along with several other highly sought after metals like copper, from their primary resources (ores and minerals). For many decades, there has been a growing demand for heap leaching due to its environmental benefits. Heap leaching provides mining operators with a benign

Heap Leaching

Heap Leaching Heap Leaching is being done these days on relatively low-grade ores for gold, copper and uranium recovery. Typical operations take place for about one to three months per heap and the recovery achieved is at least 60% and may be as high as 85% in some cases. Both oxide copper and sulfide copper

(PDF) Heap Leaching Technology-Current State, Innovations

Cortez heap leach in 1969 in Nevada as the "birthplace" of modern gold heap leaching (Kappes, 2002). At the same time, the first modern copper heap leach operation may have been the

TECK’S CESL COPPER PROCESS: A COMMERCIAL READY

cost effective ways to develop copper porphyry deposits is becoming increasingly important. For example, brownfield projects in South America with depleting heap leach production but with an underlying sulphide deposit represent an opportunity to integrate concentrate leaching with existing solvent extraction and electrowinning infrastructure

Western Copper And Gold Announces Positive Feasibility

Jan 07, 2013· Heap Leach. The operation of the heap leach has been changed from a run-of-mine operation to a coarse crush and conveyer stack operation in order to achieve a higher gold recovery of 66%. The heap leach reserve has increased from 82 million tonnes to 157 million tonnes in part as a result of the increased gold recovery. Metallurgy & Flow Sheet

BHP completes heap leach technology trial for Olympic Dam

BHP uses heap leaching at its copper operations in Chile, however Olympic Dam’s polymetallic properties require a different approach. The research and development program has the potential to benefit the mining industry more broadly in South Australia, as heap leaching has the potential to deliver lower capital and operating costs, increased

Panoro Reports Positive Preliminary Economic Assessment

The estimated 17 year life of mine includes 118.7 million tonnes of mineralized leach pad feed plus 163.4 million tonnes of waste rock resulting in an average waste:process feed ratio of 1.38:1. The average life of mine leach pad head grade is 0.43% copper. The leach material placement is planned at an average rate of 20,000 tonnes per day.

Flotation or Heap Leaching? researchgate.net

Heap leaching is an industrial mining process to extract precious metals, copper, uranium, and other compounds from ore via a series of chemical reactions that absorb specific minerals and then re

Chloride heap leaching BHP Billiton SA Limited

The invention claimed is: 1. A hydrometallurgical method of recovering copper from a material, in a heap, that contains a copper sulphide mineral which contains at least chalcopyrite comprising leaching the material in an acidic chloride solution or a mixed chloride/sulphate solution in the presence of dissolved oxygen and maintaining the mineral's surface potential within a range of 550 mV

Application of SART to Heap Leaching of Gold-Copper

a heap leach operation. Given increasing levels of cyanide complexed copper in current pregnant solutions from Maricunga heaps (over 300 ppm Cu), there is a need to reduce these levels and decrease cyanide consumption and cost. Additionally, a means of disposing of this copper is required, preferably as a saleable product. The well

Elim Mining Announces $140 Million Cumulative Free Cash

Mar 10, 2020· Heap leach operation processing 75,500,000 short tons (“st”) @ 0.168% total copper (“TCu”) over 8 years Total copper production of 182.4 million lbs of copper as cathode

(PDF) Cyanide Leaching of Copper-Gold-Silver Ores

A tra de-off study of heap acid leaching versus heap cya nidation leaching for copper-gold-silver ores was conducted at a scoping level. The main concl usions are the following:

Escondida Copper Mine Oxide Leach Expansion Ausenco

The Escondida Mine is located in the Atacama Desert, Chile. In 2012 it accounted for five per cent of global copper production and around 15 per cent of Chilean copper production. The mining operation includes an oxide ore heap leach plant processing approximately 20 mt/y of ore.

BHP completes heap leach technology trial for Olympic Dam

BHP uses heap leaching at its copper operations in Chile, however Olympic Dam’s polymetallic properties require a different approach. The research and development program has the potential to benefit the mining industry more broadly in South Australia, as heap leaching has the potential to deliver lower capital and operating costs, increased

Heap Leaching

Heap Leaching Heap Leaching is being done these days on relatively low-grade ores for gold, copper and uranium recovery. Typical operations take place for about one to three months per heap and the recovery achieved is at least 60% and may be as high as 85% in some cases. Both oxide copper and sulfide copper

Iron Removal Heap Copper Leaching

Heap leaching Revolvy. Feb 09, 2016· Heap leaching is an industrial mining The largest copper heap leach operations than for copper and requires various stages of iron and magnesium removalget price

Precious Metal Heap Leach Design and Practice

Agricola, in his book De Re Metallica (publ. 1557) illustrates a heap leach with a 40-day leach cycle (Figure 1), which could pass in many ways for a modern heap leach. The Agricola heap leach recovered aluminum (actually alum) for use in the cloth dying industry. Copper heap and dump leaches in southern Spain were common by about 1700.

Copper recovery using leach/solvent extraction

leaching of high-grade copper oxide ore followed by EW of copper from the leach solution, produced low quality copper cathode at relatively high cost. In 1968 the tonnage of high-grade oxide ores was decreasing and vat leaching was on the decline. The second process, heap and dump leaching of low-

The Development of Nickel Laterite Heap Leach Projects Rev 0

More extensive development work on heap leaching and metal recovery from solution was undertaken by BHP Billiton, who applied acid agglomeration to a range of nickel laterite ores, including limonites, saprolites and fine clay bearing ores9. They also introduced the concept of two-stage heap leaching, using a lead and a lag heap. An important

The selective leaching of copper from a gold–copper

gold leaching either using the same process at elevated temperature (40–60 °C), as patented by the authors, or using a cyanidation process. Copper selective leaching will reduce the gold losses due to a cementa-tion mechanism of gold in the presence of metallic copper as all of the metallic copper will dissolve in the pre-leaching stage.

Dump and Heap Leaching Hydro-Jex

for successful heap leaching of gold and copper are provided in the chapters on gold, silver, and copper hydrometallurgy elsewhere in this handbook. Other metals of interest in heap or dump leaching include uranium, nickel, cobalt, zinc, and recently, some rare earth elements. Of these, uranium heap leaching has had the most attention.

TENORM: Copper Mining and Production Wastes Radiation

Sep 14, 2016· Heap Leaching. In contrast to dump leaching, heap leaching refers to the application of chemicals to low-grade ore that has been crushed and deposited on a specially designed pad. The pad is lined with synthetic or natural materials such as polyethylene or compacted clay. Copper heap leach operations are much smaller than copper dump leaches.

Copper Heap Leaching & SX-EW Slideshow MineralsEd

Heap leaching & SX-EW is a method of extracting pure copper from oxide ore by placing the crushed ore on a pad in a heap and spraying the leaching solution, sulphuric acid, over the heap. The acid trickles through the heap and dissolves the copper mineral into solution. The leach solution collects at the bottom of the pad in a collection pond.

Copper Heap Leaching & SX-EW Slideshow MineralsEd

Heap leaching & SX-EW is a method of extracting pure copper from oxide ore by placing the crushed ore on a pad in a heap and spraying the leaching solution, sulphuric acid, over the heap. The acid trickles through the heap and dissolves the copper mineral into solution. The leach solution collects at the bottom of the pad in a collection pond.

Ore agglomeration behavior and its key controlling factors

In specific, in terms of copper oxides, the heap compaction was mainly related to the acidic consumed reaction and caused by the dissolution of alkaline gangue minerals (e.g. CaSO 4, etc.); in terms of copper sulfides (e.g. chalcopyrite, chalcocite, etc.), the leaching bacteria could be pre-intervened in the preparation of agglomerations.

Escondida Copper Mine Oxide Leach Expansion Ausenco

The Escondida Mine is located in the Atacama Desert, Chile. In 2012 it accounted for five per cent of global copper production and around 15 per cent of Chilean copper production. The mining operation includes an oxide ore heap leach plant processing approximately 20 mt/y of ore.

Iron Removal Heap Copper Leaching

Heap leaching Revolvy. Feb 09, 2016· Heap leaching is an industrial mining The largest copper heap leach operations than for copper and requires various stages of iron and magnesium removalget price

SART for copper control in cyanide heap leaching

SART for copper control in cyanide heap leaching Copper-loaded carbon can also result in significant copper reporting to dorè bars along with gold and silver, increasing refining costs The copper-bound cyanide inventory in the heap can create environmental issues with heap closure that may require more extensive washing and possibly even

Bildplatshållare Mine cost drivers Boliden

Heap leaching SX EW The process is normally applicable to oxide minerals (the upper weathered zone of the ore bodies) Some 20% of copper production is coming from HL operations Some applications on zinc and nickel have recently started The heap leach process is now in many cases enhanced by use of

Improvements in Copper heap leaching by use of wetting

leaching conditions must aim on shorter leaching times as well as on a higher copper extraction rate, thus to an increase in copper productivity and lower costs per ton of copper. Because leaching processes include interactions between solid (ore) and liquid (sulfuric acid) phases such improvements may be achieved by the use of wetting agents.

Mission 2015: Bioleaching

This is mainly due to lack of infrastructural costs. The operating costs based on current technology for leaching dumps and ores are between 0.18 USD and 0.22 USD per pound of copper. These are competitive with the unit costs of smelting (Table 2). However, the costs vary with the grade of the material being leached. This is illustrated in Table 5.

The Case for Glycine Heap Leaching

Sulphuric acid is a major cost in heap leaching of copper oxides, and carbonate-hosted copper deposits are often untreatable for this reason. There are a number of potentially rich copper deposits around the world that have been neglected due to lack of a suitable process.

Copper recovery using leach/solvent extraction

leaching of high-grade copper oxide ore followed by EW of copper from the leach solution, produced low quality copper cathode at relatively high cost. In 1968 the tonnage of high-grade oxide ores was decreasing and vat leaching was on the decline. The second process, heap and dump leaching of low-

Innovations in Copper Mineral Processing Technology

either mill, heap leach or smelter. Allows smaller mills to be built or increase capacity of an existing mill. Manage ore blending programs more effectively. • For copper heap leach applications, removes gangue acid-consuming (GAC) rocks which reduces acid costs.

Heap Leaching Mining Techniques, Metals Mining, Copper

Heap leaching is an industrial mining method to dig out precious metals and copper compounds from ore. Process of heap leaching The mined ore is crushed into tiny chunks and heaped on an impermeable plastic and/or clay lined leach pad where it may be irrigated with a leach solution to melt the valuable metals.

NEW LEACH TESTS SHOW POTENTIAL FOR HIGH Live

costs for comparable levels of copper production and the possibility of shortened timelines to production. In view of these results Finders will undertake a fundamental review of the relative economics between the concentrate/off-site Albion process route and the new option of heap leaching and on-site copper cathode production by SXEW."

Heap leaching targets nickel from laterite Chemical

Heap leaching targets nickel from laterite By Paul Grad March 1, 2017 The NiWest Nickel Laterite Project located at Murrin Murrin in the North Eastern Goldfields of Western Australia, has the potential to become a significant long-term, low-cost nickel producer through the development of heap leaching.