impacts associated with heap leaching of copper


Chapter 1 5 Placer mining Placer mining is used when the metal of interest is associated with sediment in a stream bed or floodplain.

Easy Guide to Mining Waste Characterisation - EESI Group

Heap leaching is most commonly associated with the extraction of gold, while certain copper, uranium and nickel ore bodies are amenable to heap leaching. The ore is crushed to typically less than 25 mm and placed on a pad and a leaching reagent is sprayed onto the ore.

Copper extraction - Wikipedia

Such oxide ores are usually leached by sulfuric acid, usually in a heap leaching or dump leaching process to liberate the copper minerals into a solution of sulfuric acid laden with copper sulfate in solution.

Final Environmental Impact Statement for the Phoenix Copper ...

associated with the reclaimed heap leach pads and use of borrow material (Section 5 OUA and Section 15/16 Borrow Area) (totaling approximately 852 acres) would permanently alter the natural topographic and geomorphic features within the study area.

Chp 8 Environmental Impacts of Metal resources Flashcards ...

Leaching Methods include: Sulfuric acid leaching of oxide ores of copper or uranium and Cyanide leaching of gold ore. 2 Types of leaching processes used today: 1) heap leaching: leaching of piles of ore places on a leach pad (It's foundation made of clay, plastic, or concrete), allowing collection of the metal rich solution at the base of the pile.

Impacts of Mineralogy on the Chemistry and Microbiology of ...

The effect of particle size on the rate of the copper leaching was also investigated, and it was shown that the copper bioleaching rate decreases as the amount of fines increase, which limits the permeability, thus decreases leaching rate.

(PDF) Leaching of copper oxide with different acid solutions

Also, enhance leaching of copper oxides is carried out using different acid solutions included of HCl, H 2 SO 4 and HNO 3 and its leaching mechanism is studied ( Habbache et al., 2009). Recently ...

Producing Copper Nature's Way: Bioleaching

In 2001, bioleaching constituted approximately 10% of Chilean copper production and heap and dump leaching, in general, constituted approximately 30% of Chilean production. 2 The first Chilean plant to be put into operation was S.M. Pudahuel.

Environmental Impacts - SERC

The Zortman-Landusky gold mine is a case study of the environmental risks of cyanide heap-leach gold mining and the impacts that these operations can have on communities, water and cultural resources.

Improvements in Copper heap leaching by use of wetting agents

Heap leaching belongs to the group of percolation leaching processes and operates over ground. The procedure is illustrated in Figure 1.The oxide copper ore is piled up on leach pads, which have a slight slope of approx. 3° and a rubber lining, which seals the ground under the heap.

Environmental Risks of Mining - Massachusetts Institute of ...

Heap Leaching Environmental issues with heap leaching are centered on the failure to keep process solutions within the heap leaching circuit. Release of toxic heap leaching fluids into the environment can affect the health of both the surrounding ecosystem and human population (Reichardt, 2008).

Heap Leach: Mining's breakthrough technology |

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 ...


Heap leaching is BAT for suitable ores because it allows the economical processing of ore that would otherwise be uneconomic under con ditions that can technically achieve regulatory acceptable levels of environmental risk mitigation.

Leaching Copper Mine Waste Dump -

Heap Leaching Metallurgy Metallurgical treatment consists of application of an aqueous solution of sodium cyanide and sodium hydroxide to the ore heaps to dissolve the gold and silver values. Leaching solution concentrations to the heap are maintained nominally at 0.05% cyanide and 0.03% NaOH and solution PH is maintained at 11.0.

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

Assessing the environmental impact of metal production processes

mental impacts associated with a product, process or activity ... Copper is produced by both pyrometallurgical and hydro- ... with heap leaching being the process selected from the three hydromet-

Low grade ores – Smelt, leach or concentrate? - ScienceDirect

Bacterially-assisted heap leaching of low-grade copper sulphides is a developing technology that has been applied successfully to the extraction of copper from sulphide minerals such as chalcocite at ore grades down to 0.15% (Watling, 2006).

TENORM: Copper Mining and Production Wastes | Radiation ...

There are two main leaching methods: heap leaching and in-situ leaching. Heap leaching is the most common method used in the U.S. When processing copper through heap leaching, vast quantities of ore and overburden overburden Soil and rocks that have been moved out of the way to get to ore are called "overburden."

"Effects of adding acid plant sulfur on heap leaching" by ...

Copper ore deposits are found across the world and heap leaching of copper has been implemented effectively for years. The ore is broken down to copper ions and elemental sulfur in the heap. Acid plants are used in mines to replenish the raffinate leaching the heaps which consists of sulfuric acid.

Assessing a two-stage heap leaching process for Platreef ...

integration between the heap bioleach and heap cyanide leach operations, as the heap bioleach is quite exothermic and the cyanide heap leaching operation is roughly energy- neutral, except for environmental and evaporative losses.

How can metal mining impact the environment? | American ...

Published by the American Geosciences Institute Environmental Awareness Series. Modern mining operations actively strive to mitigate potential environmental consequences of extracting metals, and such operations are strictly regulated in the United States.

Copper production & environmental impact - GreenSpec

Spent Ore from Heap, Dump, and Vat Leaching. Spent ore consists of the material remaining in either dump or heap leach piles when leaching ceases. Spent ore from heap, dump, and vat leaching may contain residual lixiviant and other constituents of the ore. Some operations may refer to wastes from vat leaching operations as tailings.

Heap leaching a stack of gold | MiningFeeds

Heap leaching is used to extract gold, copper, silver, uranium, and iodine. This method was first employed to extract copper at the Bluebird mine in the US in the early 1960s, and then by several gold mines in the western parts of the US a few years later.

Heap Leaching - an overview | ScienceDirect Topics

Heap leaching is a widely used extraction method for low-grade minerals, including copper, gold, silver, and uranium. This method has new applications in nonmetallic minerals such as saltpeter and soil remediation.

Agitated Copper Leaching & Cementation Process

Copper Agitated Leaching and cementation process of copper problem: The treatment of copper ores, both oxides and sulfides by means of flotation, hydrometallurgy or other processes has been well established for many years.