dump leaching operations

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Dump leaching requires years to extract part of the copper, and leach dumps often become impermeable owing to precipitation of iron salts which greatly reduces the copper leaching rate. ... simulating conventional operations, and then the flow was stopped to recover the copper either by cementation or by solvent extraction. Typical ...

Refer to Chapter 7.4, Heap leaching is often broken into two principle distinc- "Vat Leaching," and Chapter 7.2, "Solution Mining and In tions, run-of-mine or ROM dump leaching and crushed ore Situ Leaching" for more detailed information. heap leaching. Dump leaching consists of truck end-dumping Heap leach operations are …

Dump leaching is a way to economically extract some value from what is otherwise waste material. Dumps are located on natural slopes and leach solutions flow to a natural drainage basin. There is minimal or no site preparation. ... Most of the world's hydrometallurgical copper production is obtained from heap leaching operations. The biggest ...

Dump Leaching Ore Preparation. Although waste rock from either underground or open pit mines is of too low a grade to warrant conventional milling, some gold or silver may be recovered by leaching it. If dumps are leached without additional ore preparation or transporting the rock to prepared pads, the operation is termed a dump …

The microflora of four industrial copper dump leaching operations in Bulgaria was studied in detail and it was found that the copper solubilizalion depended mainly on the amount and activity in situ of the mesophilic acidophilic chemolithotrophic bacteria which occurred in the ore dumps, which were the prevailing microorganisms in these engineered …

The document discusses potential problems that may arise with copper dump leaching technologies. Modern dump leaching uses engineered containment and drainage systems to address environmental concerns of past unmanaged dumps. However, as dump sizes increase rapidly and push design limits, new issues could emerge regarding construction …

Dump Leaching. Dump leaching is used for low-grade and waste material stripped from open- pit operations. Run-of-mine ore materials containing copper in …

The bulk of the leach solutions were used in conventional heap and dump leach operations where chemical reaction in Eq. ... Another example of using geophysics for safe operation of in-situ leaching concerned Heap No. 13. The phreatic levels in that heap rose steadily during the first six months of operation. Furthermore, seepage of …

Industrial copper dump leaching operation at Vlaikov Vrah mine, Bulgaria. D.V. Vassilev and S.N. Groudev. In: Dump and underground biological leaching of ores. Moscow: Vneshtorgizdat, 1990. Google Scholar Beck J.V. The role of bacteria in copper mining operations. Biotechnology and ...

where LR is the leaching ratio (m 3 /t), Ir is the irrigation rate (L/m 2 h), If is the irrigation frequency (h/d), Ic is the irrigation cycle or irrigation time (d), ρ ap is the apparent density of the stacked ore (tonne/m 3), and H is the height of the irrigated heap (m). The parameters involved in Eq. 1 are frequently used to design and operate heap …

Traditionally, mine operations use d 80 (or P 80) to denote particle size distribution in concentrators and maybe in leaching operations. However, in dump leaching, d 50 and d 80 were susceptible to the occurrence of extremely large particles and thus exhibited a high degree of uncertainty and variability. The presence of those large …

A model of the dump Capital and operating costs for heap or dump leach operations leaching process that incorporates oxygen balance, heat can vary …

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 …

1. Introduction. A widely used method for exploiting secondary sulphide copper deposits involve leaching the ore in heaps or dumps. In both instances, ore …

Unique to heap leaching is the relatively coarse particle size, typically 12–25 mm top size for crushed and agglomerated ores and larger for run-of-mine dump leaching operations. Leaching from ...

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 ...

When the dump leaching operation at the Copper Cities mine site was closed in 1982, Pinto Valley Copper Corporation constructed a system of diversion trenches to channel overflows from the leach pile collection sumps into the tailings pond for evaporation. The trench system was designed to handle flows resulting from a 100-year storm event and ...

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 …

Dump Leaching. Dump leaching was initiated during the late 1960s. One of the well-known dump leaching operations is located in Bingham Canyon, Utah (The United States) of …

The present paper discusses the results obtained during, the 18-year period of the industrial copper dump) leaching operation. The flowsheet is presented and each separate component of the complex ...

Usually the operation of heap leaching is carried out until the maximum recovery has been obtained, or until observing that the concentration in the output solution of the heap exhibits no further extraction. ... Percolation leaching techniques, such as heap leaching, dump leaching, bio-leaching and in-situ leaching have been extensively ...

Mineral leaching is the key unit operation in metallurgical processes and corresponds to the dissolution of metals. The study of leaching is carried out in many areas, such as geology, agriculture and metallurgy. This paper provides an introduction to the theoretical background regarding the mathematical modelling of the leaching …

Dump leaching is characterized by very low-grade ore leaching. It involves run-of-mine material that has not undergone significant crushing or processing. Dump …

The full report addresses these issues with regard to the development, operation, and closure activities associated with copper dump leaching operations. General Characteristics Although the number of active mines in the United States has decreased in recent years, the percentage of primary copper produced by leaching has increased.

a) Dump Leaching In most applications, dump leaching is a convenience for open pit mining operations to dispose of lower grade or waste rock (typically below 0.2% Cu) (4) and stripped material with the intention of recovering the valuable metals contained therein (Figure 1). Dump design is dictated by topography and haulage costs.

SYSCAD MODEL. SysCAD is a specialised process simulation software package, widely used in the minerals industry for flowsheet modelling. A dynamic model was initially developed for evaluation of a nickel laterite heap-leach in conjunction with an existing pressure leach operation. The model was further developed and refined for a …

It can also be divided into in situ leaching, ore heap leakage leaching (or dump leaching), and tank leakage leaching (or tank leaching, pool leaching), etc. Leakage leaching is only used for certain specific conditions. ... Agitation leaching of intermittent operation is generally concurrent leaching, but it can apply crossflow and …

Habashi proposed in situ, dump or vat leaching of phosphate rocks with dilute HNO 3 (20%) or HCl (10%) to get a solution of monocalcium phosphate, and to allow recovering uranium and rare earths ...

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 …

employed: dump leaching and vat leaching (vat leaching is the treatment of sand or crushed ore in bedded vats with rapid solution percolation). Typically, heap leaching is chosen for basic financial reasons - for a given situation, it represents the best return on investment. For small operations or operations in politically unstable

I NCREASING THE DURATION OF DUMP LEACHING OF COPPER UNDER WINTER CONDITIONS 545. 2. gion), where ore piles are arranged using a dump method, the issue of ensuring unint. distinctive features of ...

Leaching occurs through chemical and if-fusion controlled processes inwhich pyrite andchalcopyrite are oxidized byferric ions in the lixiviant. Oxygen, the primary oxidant, …

Dump leaching consists of truck end-dumping of ore broken only by the drilling and blasting of mining activ-ity. After completion of ore placement, the surface is ripped using bulldozers to break up compaction layers and improve solution distribution uniformity.

The leaching process is easier when it comes for the execution. It is not a harmful process in comparison to the other pyrometallurgical methods. It does not lead to any sorts of gaseous pollutants. Disadvantages of Leaching are as Follows. The residual liquid waste that is generated from the leaching process is highly acidic in nature.