dump leaching large

Heap Leaching Oxide and Sulfide Copper Ores

Dump leaching is used to recover copper from very low-grade oxide-sulfide pit-waste materials. Here again, leach solutions are percolated downward through a heap. ... Two large-scale heap-leaching tests were conducted on minus 6-inch ores number 1 and 2 in 4-foot-diameter by 16-foot-high concrete columns. The purpose of these tests was to ...

Leaching: Types, Methods, Advantages, Disadvantages

Dump leaching. Heap and in-situ leaching characteristics are combined in dump leaching. Depending on the dump location, an impermeable layer may or may not be employed in a dump leach. The ore is dumped to allow similar processing to heap leaching, but the geological conditions of the area allow a valley or pit to act as the sump. ...

TENORM: Copper Mining and Production Wastes | US EPA

Copper mining waste storage piles may be as large as 1,000 acres and typically include three types of waste; tailings, dump and heap leach wastes, and waste …

Hydrometallurgical Recovery of Gold from Mining Wastes

Before the large-scale use of cyanide leaching, chlorination was widely applied for gold recovery [20, 21]. Gold dissolution occurs in two stages according to Eqs. (8) and . A u + C l ... Biooxidation of gold can be applied as …

Application of aerial image analysis for assessing particle size

The very large size of the ore particles being leached, as much as two meters in diameter, should preclude any significant metal recovery. Dump leaching should not work; and yet it does. This study investigated the leaching of coarse-sized copper sulphide ore, with top sizes ranging from 150 to 250 mm.

Biomining

Dump leaching: low-value ore or waste rock is placed in a sealed pit and then bioleached to remove more of the valuable metals from the waste pile. Agitated leaching: crushed rocks are placed into a large vat that is shaken to distribute the microbes and material evenly and speed up the bioleaching process.

Influence of Chelating Reagents on Leaching of Copper Ore

dump leaching methods has shown that the addition of organic chelating reagents can significantly enhance the lixiviant permeability through the ore and the concentration of the metal values in the liquor. For example, the addition of 5 giL citric acid (CA) to a conventional sul­ ... uses a large quantity of chelating rea­ ...

Emerging Issues in Heap Leaching Technology

in its "run-of-mine" state, placed in very large tonnage and thick lifts often in an unlined area. Dump leaching dates back much of a century but modern heap leaching emerged in about 1980 with the first large scale copper projects in Northern Chile and, at almost the same time, the large number of gold projects in the Western United States.

TENORM: Copper Mining and Production Wastes | US EPA

The amount of marketable copper produced is small compared to the original material mined. Several hundred metric tons of ore must be handled for each metric ton of copper metal produced, thus generating large waste quantities. For example: In-situ leaching can transport uranium and thorium into groundwater or surface water at the …

Dump Leaching

Microbial leaching

In addition, problems may arise when the large-scale leaching process of a waste dump is improperly managed. Leach fluids containing large quantities of metals and having extrememly low pH values (pH 3) can seep from such dumps into nearby natural water supplies and ground waters, causing enormous and lasting damage. …

How copper dump leaching works

In copper dump leaching, run-of-mine ore is irrigated with acidic leaching solution to generate aqueous cupric ions for further processing. The very large size of …

Progress in bioleaching: part B, applications of microbial

It can be argued that adoption of SX-EW across the industry enabled the exploitation of relatively low-grade deposits (< 0.5% Cu by weight) through heap and dump leaching (Kordosky 2002) and by extension, bioleaching.Higher-grade deposits can be processed more efficiently through direct smelting or smelting of flotation concentrates.

Bio Hydrometallurgical Technology, Application and Process

In general leaching techniques are two – Percolation leaching – a solution infiltrate through a fixed mineral location, and agitation leaching - mineral bearing ore stirred by a solution but while working in large scale, percolation leaching is usually chosen . The principal commercial methods are aerated stirred-tanks, in situ, dump, heap ...

Full article: Methodology for a dump design optimization …

Dump leaching technologies have developed over the last decades, allowing the mining industry to build larger and higher dumps faster than ever (Smith, Citation 2002), since …

Increasing the Duration of Dump Leaching of Copper Under …

The successful introduction of the technology of copper production using a dump leaching method is associated with low capital investments, low cost of copper extraction, quick payback, high labor productivity, and the absence of energy- and material-intensive operations. The experience of implementing dump leaching technology has …

Heap Leaching

In dump leaching, the as-mined ore is piled up as dumps and irrigated with leaching solution that percolates through the bed and effluents collected from the base. No crushing is involved before stacking and all sizes of the mined ore ranging from large boulders to few centimeters and more form part of the dump.

(PDF) A Model of the Dump Leaching Process that

The model was used to simulate the leaching of copper from a small test dump, and excellent agreement with field measurements was obtained. ... tw o o r te n time s large r tha n complet e oxyge n ...

Office of Wastewater Management

The extraction and beneficiation of metals and non-fuel minerals necessarily lead to the generation of large quantities of waste. Four basic types of waste produced by hardrock mining are: ... Spent ore is the material remaining after leaching. For example, copper or gold ore subjected to heap or dump leaching will become spent ore when ...

LixTRA™ – Novel Copper Leach Technology

Heap and Dump leaching are processes used to extract metals such as copper, gold, nickel and uranium from their ores by placing the ore on a pad in the form of a heap. A …

Heap bioleaching of chalcopyrite: A review

The earliest engineering technology used in dump leaching was very basic in nature involving dumping a low-grade (otherwise waste) copper-bearing ore in the form of large rock/boulder into vast mounds and irrigating it with dilute H 2 SO 4 to enhance the growth and activities of mineral-oxidizing acidophiles, i.e., primarily iron-oxidizing ...

Situ Leaching

In dump leaching, the as-mined ore is piled up as dumps and irrigated with leaching solution that percolates through the bed and effluents collected from the base. No crushing is involved before stacking and all sizes of the mined ore ranging from large boulders to few centimeters and more form part of the dump.

Leaching.pptx

Methods of Leaching In-situ(in-place ) leaching Dump leaching Heap leaching Vat leaching Agitation leaching (or Pulp leaching) 13. ... • Its study has increased during the last few years due …

Recent trends and challenges in bioleaching technologies

Dump leaching includes permeation of acid solution through the mineralized particles over the mass. Local microorganisms are permitted to multiply by giving ideal development conditions. Metals are naturally solubilized and the profluent gathered at the base is rich with the metal substance. ... Requires large area; time-consuming; risk of ...

Metal Extraction | SpringerLink

In-situ leaching reduces costly excavation and reclamation costs. For deep deposits, in-situ leaching may be the only viable method of extraction. Many small scale in-situ leaching projects have been accomplished. However, due to uncertainties with regard to solution control, in-situ leaching has not been practiced on a large scale. 5.1.3 Dump ...

Copper Leaching Practices

The first large-scale leaching and precipitation of copper was probably at Rio Tinto in Spain about 1752. The method employed comprised open-air water leaching of weathered piles of copper-bearing ore followed by precipitation of the copper by iron. ... Dump Leaching. Dump leaching is used for low-grade and waste material stripped …

Dump leaching

The increasing application of dump leaching can be attributed to the large tonnage of below-grade material accumulating every day, the relar-tively low capital outlay required to put a leaching and precipitation plant on stream, the small labor force required to operate the plant, and the simplicity of the operation itself. [Pg.31]

7.4.5: Heap Leaching Method | GEOG 000

A variation of heap leaching involves constructing the "heap" in a dump, and calling it dump leaching. Large containment vessels are being used on a limited basis as well. Both heap leaching and borehole …

(PDF) THE ART OF HEAP LEACHING | Lee JOHN

2. Heap Leaching The largest producer of mining revenues within the percolation leach industry options is Dump / Heap Leach and the remaining of this paper focuses on the Art of Heap Leach. The general use of 'heap leach' below shall, unless specific, refer to both heap and dump leaching. 2.1. Why Heap Leach ?

Environmental risk assessment of industrial byproduct gypsum

2.2 Sequential batch extraction leaching. The sequential batch extraction process is performed by regularly adding fresh leaching medium in the process of the leaching experiment to simulate the leaching conditions where the disposed gypsum experiences repetitive percolation of rainwater and/or acid mine drainage (AMD) …