Tailings

Lottermoser, Bernd G.

doi:10.1007/978-3-642-12419-8_4

Cited by 17 publications

(6 citation statements)

References 91 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Acid drainage is generated by the oxidative dissolution of metal sulfides to sulfuric acid and dissolved metals upon exposure to water and oxidants such as oxygen (O 2 ) or ferric iron (Fe 3+ ; Sand et al, 2001 ; Johnson and Hallberg, 2005 ). This can be triggered naturally (ARD) or by mining operations (AMD; Lottermoser, 2010 ). The Tinto River, which flows through the massive sulfide deposits of the Iberian Pyrite Belt (IPB; Huelva, Southwestern Spain), is one of the best-known examples of ARD.…”

Section: Introductionmentioning

confidence: 99%

Acetate Degradation at Low pH by the Moderately Acidophilic Sulfate Reducer Acididesulfobacillus acetoxydans gen. nov. sp. nov.

et al. 2022

View full text Add to dashboard Cite

In acid drainage environments, biosulfidogenesis by sulfate-reducing bacteria (SRB) attenuates the extreme conditions by enabling the precipitation of metals as their sulfides, and the neutralization of acidity through proton consumption. So far, only a handful of moderately acidophilic SRB species have been described, most of which are merely acidotolerant. Here, a novel species within a novel genus of moderately acidophilic SRB is described, Acididesulfobacillus acetoxydans gen. nov. sp. nov. strain INE, able to grow at pH 3.8. Bioreactor studies with strain INE at optimum (5.0) and low (3.9) pH for growth showed that strain INE alkalinized its environment, and that this was more pronounced at lower pH. These studies also showed the capacity of strain INE to completely oxidize organic acids to CO2, which is uncommon among acidophilic SRB. Since organic acids are mainly in their protonated form at low pH, which increases their toxicity, their complete oxidation may be an acid stress resistance mechanism. Comparative proteogenomic and membrane lipid analysis further indicated that the presence of saturated ether-bound lipids in the membrane, and their relative increase at lower pH, was a protection mechanism against acid stress. Interestingly, other canonical acid stress resistance mechanisms, such as a Donnan potential and increased active charge transport, did not appear to be active.

show abstract

Section: Introductionmentioning

confidence: 99%

Acetate Degradation at Low pH by the Moderately Acidophilic Sulfate Reducer Acididesulfobacillus acetoxydans gen. nov. sp. nov.

et al. 2022

View full text Add to dashboard Cite

show abstract

“…• Bound to Fe-Mn oxides (2): to the residual from (1) Oxalate acid (0.1 M C2H2O4, pH 2.2) was added under continuous agitation for 1.5 h at room temperature.…”

Section: ) Fractionation/mobilization Potentialmentioning

confidence: 99%

“…Heavy metal and metalloid contamination from mine wastes (e.g. dumps, waste rocks, tailings) is a serious environmental concern [1][2][3][4][5]. Globally, acid mine drainage (AMD) from oxidation of sulfide minerals is a crucial problem for the global mining industry [6][7][8][9][10], because most sulfide minerals contain heavy metals and metalloids (i.e., As, Cu, Cd, Fe, Hg, Mn, Pb, Sb, and Zn).…”

Section: Introductionmentioning

confidence: 99%

Understanding the Weathering Process of Antimony Minerals: Case Study Sb-Mine Sulzburg, Black Forest, Germany

Chawchai

Bissen

2018

App. Envi. Res.

View full text Add to dashboard Cite

Concerns about heavy metal and metalloid contamination from mine dumps is one of the most intensively discussed issues in society, politics, and academia, because of the levels of pollution, and its toxic properties. During the Middle Ages the Black Forest was one of the most successful mining areas in Southwestern Germany. Historical records show that Sulzburg was a mining town in the Black Forest since the 10th century, but was abandoned in the 19th century. Nowadays this town is considered as an important recreation area in the country. Therefore, soil and water quality and any contamination are of great concern. The purpose of this research was to understand the weathering process and environmental impact of heavy metals and metalloids from the old antimony (Sb) mine sites in Sulzburg. In this study, we examined the mineralogy and whole-rock chemistry and per-formed soil sequential extraction and water chemical analysis around mine sites. The results show that the Sb deposits in Sulzburg contain mixtures of antimony-lead-bearing sulfides and sulfosalts in hydrothermal quartz veins. The primary ore stibnite (Sb2S3) and boulangerite (Pb5Sb4S11) occur associated with pyrite, arsenopyrite, and sphalerite. The whole-rock chemistry of Sb-Mine Sulzburg is characterized by considerable Sb2O3 (4-25 %) and PbO contents (2-7 %). This agrees with the che-mical composition of Sb minerals. Based on soil sequential extraction, toxic elements (Sb, Pb, As) mostly remain in the residual fraction. Comparing the water analysis at and around Sb-mine Sulzburg, Sb concentrations are lower than those of As and Pb for all water samples. This is possible due to the strong affinity of Sb to Fe-oxides-hydroxides and amorphous material and a lower mobi-lity, from the source into water. Based on these findings, we argue that sources of toxic elements and weathering process in Sulzburg are important from the ecotoxicity perspective. Changes in oxidizing or reducing conditions can lead to release and mobilization of Sb, As, and Pb into the environment.

show abstract

“…The pH values measured at the shallower samples at 0.2 m depth (pH 7.56) were slightly lower than the values of the deeper samples at 2.5 m depth (pH 8.28). This is due to an influence of CO 2 dissolved in rain water to become H 2 CO 3 affecting pH reduction [14]. Hence, the pH of tailings nearer to the surface would be lower than the deeper tailings.…”

Section: ) Net Acid Generation Test (Nag Test)mentioning

confidence: 99%

“…Heavy metal concentrations (Ni, Cu, Zn, Co and Fe) in tailings samples are presented in Table 3. Distribution of the metals found in tailings is highly variable in composition and rather labile depending on processing technique; its composition may also change over time [14]. Concentrations of most metals at 0.2 m sampling locations tend to be lower than the concentrations at 2.5 m sampling locations, except for Zn, because rainfall tends to dilute the concentration of metals on tailings close to the surface of TSF (0.2 m).…”

Section: 2) Metalsmentioning

confidence: 99%

A Study of Residual Cyanides and Potential Stabilities in Tailings Storage Facility of Gold Mining Operation

Parinyachet

Leepowpanth

2015

App. Envi. Res.

View full text Add to dashboard Cite

The study aimed to investigate residual cyanides and their potential stabilities in tailings from a gold processing plant deposited in the Tailings Storage Facility (TSF) of a gold mining site. For this purpose, several samples of tailings were taken from the recently abandoned TSF to a depth of 2.5 meters, representing 1 to 2 years old tailings. The samples were analyzed for pH, metals, residual cyanides, and Net Acid Generation Test (NAG test). The results showed that, in all samples, pH values were neutral to slightly alkaline. Fe concentrations were relatively high (22,800-35,000 mg kg-1) indicating that Fe can readily react with free cyanide (CN-) to form iron cyanide complexes (strong metal cyanide complexes). The residual cyanide concentration in tailings was found to be very low; free cyanide (CNFree), weak acid dissociable cyanide (CNWAD), strong acid dissociable cyanide (CNSAD) and total cyanide (CNT) were in the range of 0.16-0.64, 0.37-1.06, 1.96-3.89 and 2.33-4.95 mg kg-1, respectively. Cyanides in the tailings were predominantly strong metal cyanide complexes being more stable to dissociate. Total cyanide (CNT) concentration was quite low compared with Thailand’s environmental regulations for soil quality standards andwere environmentally insignificant. The NAG test for all samples revealed that NAG pH was in the range of 5.02-6.10 and NAG was in the range of 0.08-0.31 kg H2SO4t-1indicating all samples have low or non-acid forming potentials. The findings indicated a potential to form a high proportion of strong metal cyanide complexes in the tailings, which is difficult to dissociate and releasehigh toxic cyanide to the environment.

show abstract

Tailings

Cited by 17 publications

References 91 publications

Acetate Degradation at Low pH by the Moderately Acidophilic Sulfate Reducer Acididesulfobacillus acetoxydans gen. nov. sp. nov.

Acetate Degradation at Low pH by the Moderately Acidophilic Sulfate Reducer Acididesulfobacillus acetoxydans gen. nov. sp. nov.

Understanding the Weathering Process of Antimony Minerals: Case Study Sb-Mine Sulzburg, Black Forest, Germany

A Study of Residual Cyanides and Potential Stabilities in Tailings Storage Facility of Gold Mining Operation

Contact Info

Product

Resources

About