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leaching of gold pyrite tailings

Oxidative leaching of refractory sulphidic gold tailings

Sep 01, 2020· The effect of temperature in the range of 20–65 °C on gold extraction from refractory gold tailings containing pyrite in 20% (v/v) of 1-butyl-3-methylimidazolium hydrogen sulphate [Bmim + HSO 4 −]-water solution with thiourea as complexing agent and iron(III) sulphate oxidant, at pH of 1 was examined for 12 h leaching time intervals.The experimental results revealed that the extraction of

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Bioleaching of gold pyrite tailings with adapted bacteria

Leadville gold ore tailings containing auriferous pyrite were first concentrated by froth flotation. The pyrite concentrate was treated for different periods of time with 12-weeks-adapted Thiobacillus ferrooxidans before cyanide leaching. The bioleaching of the concentrate before cyanide leaching increased the gold extraction from 32 to 95% and

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Sequential Bioleaching of Pyritic Tailings and Ferric

Minerals 2020, 10, 1097 4 of 15 Pyrite (FeS2) was the main sulfide mineral (26%) in the pyritic tailings.Copper and zinc were found as sulfides (chalcopyrite (CuFeS2), bornite (Cu5FeS4), and sphalerite (ZnS)) and oxidized compounds (sulfates) within the samples. Intergrowths with each other characterize sulfide minerals.

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Gold Tailings Reprocessing Technology

In general, the gold recovery method of gold tailings is mainly the all-slime cyanidation CIP method. It is the recovery of residual gold particles from tailings by using the property of gold soluble in cyanide. The gold recovery for large capacity and low-grade gold tailings is common heap leaching.

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First gold from Peñasquito's Pyrite Leach Project Mining

The new leach plant is expected to recover about 35% of the gold and 42% of the silver that finds its way into the tailings. The PLP treats the tailings and then feeds into a flotation and leach

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Diagnostic Leaching For Refractory Gold Ores SRK Consulting

Stage 4: Leach residue from Stage 3 is reacted in a hot nitric acid leach to dissolve more resistant sulfide minerals, such as pyrite and arsenopyrite, and liberate any gold that might be locked in these minerals. The residue is then subjected to cyanidation and a sample of the residue is assayed for gold.

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(PDF) Recovery of gold from the Mouteh Gold Mine tailings dam

The average gold extracted between the surface tailings and 1m deep tailings within just 5 h reaction time is 73.9 % for thiosulfate leaching and 73.4 % for cyanide leaching.

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The mechanisms of pyrite oxidation and leaching: A

Sep 01, 2010· Occasionally pyrite may also carry dispersions of valuable metals such as gold and is sometimes mined for this,in addition pyrite is commonly used for production of sulfuric acid . Pyrite oxidation is economically important in mineral flotation and leaching, two industrial methodologies used to separate pyrite from other minerals of value.

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First gold from Peñasquito's Pyrite Leach Project Mining

The new leach plant is expected to recover about 35% of the gold and 42% of the silver that finds its way into the tailings. The PLP treats the tailings and then feeds into a flotation and leach

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Goldcorp turning tailings into money at Peñasquito Pyrite

Goldcorp has achieved first gold at the Pyrite Leach project (PLP) at its Peñasquito operation in Mexico. Commissioning commenced in the September quarter and the PLP is now processing 100% of the existing plant tailings, with the PLP plant operating 24 h/d as it continues to ramp up.

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A STUDY OF THE BIOHYDROMETALLURGICAL METHOD FOR

Experimentally, an increase in the efficiency of leaching gold from flotation tails during preliminary bacterial oxida-tion was found. By biochemical leaching, 72 % was extracted, which is 7 % more than using expensive sodium per- and pyrite is due to the fact that these tailings were ob-tained in the process of selective flotation, with

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Diagnostic Leaching For Refractory Gold Ores SRK Consulting

Stage 4: Leach residue from Stage 3 is reacted in a hot nitric acid leach to dissolve more resistant sulfide minerals, such as pyrite and arsenopyrite, and liberate any gold that might be locked in these minerals. The residue is then subjected to cyanidation and a sample of the residue is assayed for gold.

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Influence of Hydrofluoric Acid Leaching and Roasting on

2.2. Tailings Leaching and Roasting To boost the pyrite content, 30 g of mine tailings were left in 90 mL cold hydrofluoric acid (40%) for 24 h. After this period, a highly agglomerated white to gray minerals (slag tailings) accumulated on top of the leached tailings; both components underwent continuous washing followed by drying

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(PDF) Recovery of gold from the Mouteh Gold Mine tailings dam

The average gold extracted between the surface tailings and 1m deep tailings within just 5 h reaction time is 73.9 % for thiosulfate leaching and 73.4 % for cyanide leaching.

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Recovering Cyanide From Gold Plant Tailings

thickening the leach plant tailings prior to discharge. For example, if the feed and discharge from cyanidation/gold recovery can be thickened to 60% solids, and the leach/gold recovery operation is conducted at 40% solids, the net result . is that about half of the free cyanide in . SGS MINERALS SERVICES. TECHNICAL BULLETIN 2003-02

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INVESTIGATION OF THE OPTIMAL TECHNOLOGY FOR COPPER

V. Conić et al. Investigation of the Optimal Technology for Copper Leaching from211 of pyrite increased. The authors concluded that the old flotation tailings dump is vertically divided into three zones: oxidized zone (0-5) where copper sulphide minerals were almost

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Comparison of methods of gold and silver extraction from

However, a substantial proportion of the gold and silver report in flotation middlings or tailings and is currently not recovered. Research into a number of methods for extraction of this gold and silver was conducted on various plant products, which had different mineralogy, and which assayed 1.5–3.3 g/t Au and 27–144 g/t Ag, as well as 0

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Economic Potential for reprocessing Copper Mine Tailings

A total of 81 tailings samples were analyzed using XRF, during the survey sampling. The copper grade of the tailings varied between 0.1 % and 1.7 %. Further elements of interest were iron, gold, molybdenum and zinc. This data and the tonnage of the tailings ponds was the basis to select four sites for a more detailed

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Recovery of gold from the Mouteh Gold Mine T tailings dam

the leaching circuit is pumped to the tailings dam (BHP Engineering 1991). Studies show that the gold content of the tailings residue is more than the expected level (0.1 g/t). Gold in pyrite tends to be slow leaching and due to the short residence time, the recovery of the pyritic gold

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Leaching of Trace Amounts of Metals from Flotation

Oct 25, 2018· With decreasing ore grades, the tailings of mining operations are becoming of increasing interest as metal-containing secondary raw materials. The objective of the current work was to investigate chloride leaching of gold, copper, cobalt, nickel, and zinc present in the flotation tailings. In the current study, the effect of cupric ion as an oxidant (0–50 g/L) and NaCl (150–250 g/L) on

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First gold at Goldcorp's Pyrite Leach Project Mining

The Pyrite Leach Project is expected to recover approximately 35% of the gold and 42% of the silver currently reporting to the tailings and is expected to add production of over 1Moz of gold and 45Moz of silver over the current life of the mine.

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ALTA MetBytes What's Happening in Gold Ore Processing

sections depends on the cyanide and copper levels in the CIL tailings solution. Gold is typically recovered by has developed a thiosulfate-based reagent system for gold leaching that has excellent ore with both visible and invisible gold hosted in sulphide associations of pyrite

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