heap leaching of gold

  • Heap Leaching, Heap Leaching Process, Gold Heap Leaching

    [Introduction]: Heap leaching (HL) is a flexible and economic gold ore processing method used to extract gold from lowgrade gold ores In this process, ore is firstly crushed to fine particles By spraying leaching solution to the large piles, the goldcontaining solution is leachedLargescale gold and silver heap leaching began with the first Cortez heap leach in 1969 While many projects have come and gone, Cortez is still going Nevada was the “birthplace” of modern gold heap leaching in the late 1960s, and is only recently giving up its dominance of this technologyHeap Leaching of Gold and Silver Ores ScienceDirectThe purpose of this article is to develop a model of the heap leaching process for the extraction of gold from nonrefractory ores considering the omissions made by other authors The model should, therefore, consider the effects of the transport mechanisms and employ a kinetic expression adequate for gold cyanidationModel for heap leaching of gold ores by cyanidation

  • Precious Metal Heap Leach Design and Practice

    Heap leaching of gold and silver ores is conducted at approximately 120 mines worldwide Heap leaching is one of several alternative process methods for treating precious metal ores, and is selected primarily to take advantage of its low capital cost relative to other methodsA waterbased cyanide solution for leaching the gold from the ore and water for dust suppression are the two primary uses of water at a gold heapleach operation A modeled “typical” operation that utilizes a leach pad surface area of 10,000 m2 under constant leach and employs a 60day leach cycle with 10m lifts for every million metric tons of annual mine ore capacity has an estimated leachate application rate that ranges from 8 to 12 L/m2/h This rate of application results in an average annual leach water requirement of roughly 82,000 to 120,000 L/m2/yr The makeup water to replace that lost by evaporation and other factors may account for an additional 5 percent to as much as 10 percent of this amount Consequently, a modeled heapleach goldEstimated Water Requirements for Gold HeapLeachThe cyanide heap leaching of copperbearing gold ores is a very complex phenomenon which is comprised of five, more or less distinct, sequential steps, depending on the mineralogy of the ore (1) Following leach extraction of WASCu, if present, the reductive dissolution of Cu(II) salts, resulting in the quantitative oxidation of cyanide and the precipitation of copper and gold cyanide saltsModeling the cyanide heap leaching of cupriferous gold

  • Heap Leach: Mining's breakthrough technology

    What is Heap Leaching? Heap leaching (HL) is a flexible and constantly developing mineral processing and extraction technology that is gaining popularity and recognition for existing miners andThe 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 reclamationGold Heap Leach Cost Guide Costmineheap leaching, which has a relatively low level of energy consumption, is for example successfully used for the beneficiation of certain types of gold ores in Turkey It contributes to the substantial development of a sustainable gold mining sector in that country and has theHEAP LEACHING TECHNIQUE in MINING Euromines

  • Heap Leaching, Heap Leaching Process, Gold Heap

    Gold heap leaching process means transfer the raw ore to the prepared yard, or directly stock on the waste rock or lowgrade ore, then use cyanide leaching liquid to spray or infiltrate, and the ore reacts with the cyanide leaching liquid After several recycling of leaching liquid and repeat spray, the leaching liquid can be collectedHeap leaching can take anything from a couple of months to several years In the case of gold recovery, heap leaching generally requires 60 to 90 days to leach the ore, compared to the 24 hours required by a conventional agitated leach process Gold recovery is also usually only 70% compared with 90% recovery in an agitated leach plantHeap leaching a stack of gold MiningFeedsGroudev SN, Sasova II, Groudeva VI et al Pilot scale microbial heap leaching of gold from a refractory ore at the Zlata Mine, Bulgaria In: Vargas T, Jerez CA, Wiertz JV et al, eds Biohydrometallurgical Processing Vol I Santiago: University of Chile, 1995: 425–435 Google ScholarHeap Leaching of GoldBearing Deposits: Theory and

  • Enhancement of Gold Heap Leaching by Using a

    The paper provides a theoretical justification of the key chemical aspects of enhancing the process of heap leaching (HL) of gold by using a reagent complex containing hydrogen peroxide A schematic illustration of heterogeneous catalytic reactions, which occur during metal leaching, as well as examples of the geometry and dissociation energy of a number of gold clusters are presentedThe HeapLeach Process Briefly stated, gold heap leaching is a hydrometallurgical process designed to treat amenable lowgrade gold ores that contain roughly 05 gram per metric ton (g/t) gold to 15 g/t gold (Marsden and House, 2006; Wong Wai Leong and Mujumdar, 2010) The ore is stacked by various types of equipmentEstimated Water Requirements for Gold HeapLeachThis paper presents a computational algorithm developed to simulate the temporal evolution of the gold ore heap leaching process The data used in the model include physical chemical , geometrical(PDF) Mathematical Modelling of Gold Ore Heap

  • Heap Leach: Mining's breakthrough technology

    Heap Leaching of Gold In 2014 about 150 major goldsilver mines worldwide utilized HL technology and recovered about 15 million troy ounces of gold, roughly 17% of global gold• Heap leaching of gold ore started to gain promenence in the late 1960’s when it was applied on a large scale to low grade ores that were uneconomic to procees by conventional tank leach methods • The first use of cyanide for leaching of gold andHEAP LEACHING TECHNIQUE in MINING SDIMITable 21 Leaching systems for gold (J T Woodcock, 1988) 6 Table 22 Properties and applications of leaching reagents for gold 7 Table 23 List of gold minerals (R W Boyle, 1979) 10 Table 24 Most common naturally occurring gold minerals (Marsden et al, 1992) 11 Table 25 Stability constants for some of the metal cyanide complexes 29THE CYANIDE HEAP LEACHING BEHAVIOR OF

  • Application of SART to Heap Leaching of GoldCopper

    APPLICATION OF THE SART PROCESS TO HEAP LEACHING OF GOLDCOPPER ORES AT MARICUNGA, CHILE KEVAN J R FORD AND ROBERT D HENDERSON –– KINROSS GOLD CORPORATION, AND DR CHRIS A FLEMING –– SGS ABSTRACT Kinross Gold Corporation’s Maricunga mine in Chile presents an ideal opportunity to apply the SART process to a heap leachGold heap leaching process refers to the process of stacking lowgrade gold ore or flotation tailings on the bottom material, and spraying the sodium cyanide solution circularly to dissolve the gold in the ore and recover it from the goldcontaining pregnant liquid Gold heap leaching process mainly consists of heap leaching site constructionGold Heap Leaching Process Technical Requirements YouHeap leaching is a method in which a leaching solution is sprayed with a spray leaching system to selectively leach the useful minerals in the ore and recover the useful mineral from the pregnant liquid flowing out of the heap during the infiltration process Lowgrade gold ore heap leaching is a new gold extraction process developed in the 1980sGold Cyanidation Heap Leaching cnlitereagent

  • Heap leaching a stack of gold Mining Mirror Online

    Heap leaching can take anything from a couple of months to several years In the case of gold recovery, heap leaching generally requires 60 to 90 days to leach the ore, compared to the 24 hours required by a conventional agitated leach process GoldHeap leaching (HL) is a flexible and economic mineral processing method, commonly used to extract gold from lowgrade gold ores In this process, ore is firstly crushed to fine particles By spraying leaching solution to the large piles, the goldcontaining solutionHeap Leaching, Heap Leaching Consulting, Heap Leaching ofThe paper provides a theoretical justification of the key chemical aspects of enhancing the process of heap leaching (HL) of gold by using a reagent complex containing hydrogen peroxide A schematic illustration of heterogeneous catalytic reactions, which occur during metal leaching, as well as examples of the geometry and dissociation energy of a number of gold clusters are presentedEnhancement of Gold Heap Leaching by Using a Reagent

  • (PDF) Mathematical Modelling of Gold Ore Heap Leaching

    This paper presents a computational algorithm developed to simulate the temporal evolution of the gold ore heap leaching process The data used in the model include physical chemical , geometrical• Heap leaching of gold ore started to gain promenence in the late 1960’s when it was applied on a large scale to low grade ores that were uneconomic to procees by conventional tank leach methods • The first use of cyanide for leaching of gold andHEAP LEACHING TECHNIQUE in MINING SDIMIFOR HEAP LEACHING OF FRESH ROCK GOLD ORES Brian McNab Senior Metallurgist Comminution Orway Mineral Consultants IIR CRUSHING & GRINDING CONFERENCE 2006 29 – 30 March 2006 Townsville, Qld ABSTRACT This paper discusses the concept of applying HPGR technology to the preparation of low grade gold ores for heap leachingEXPLORING HPGR TECHNOLOGY FOR HEAP LEACHING

  • Dump and Heap Leaching HydroJex

    Dump leaching has mostly been applied to gold, silver, and copper ores, whereas heap leaching has been applied to many different minerals including copper, gold, silver, uranium, vanadium, zinc, nickel, and cobalt However, as the principal applications are copper and precious metals, most of the following discussion will refer to these metalswith heap and bacterial leaching methods By the example of gold and silver ores, we analyzed specific issues and processing technologies for heap leaching intensification in severe climatic conditions The paper presents perspectives for heap leaching of sulfide and mixed ores from the Udokan (Russia)Hydrometallurgical Processing of LowGrade Sulfide Ore