Geomicrobiology applied to mineral exploration in Mexico

Melchior, Alain; Cardenas, José Vargas; Dejonghe, Léon

doi:10.1016/0375-6742(94)90017-5

Cited by 10 publications

(6 citation statements)

References 4 publications

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“…The background average value F1 standard deviation is 95,000F88,000 CFUs g À1 dry weight. A high variability of the background value has also been noted in other studies (e.g., Melchior et al, 1994) In soil samples located closest to the primary Au deposit, between the sampling sites NW10 and SE20, B. cereus spore counts are up to 10 times higher than the background value ( Fig. 2A).…”

Section: Bulk Geochemistry Mineralogy and Enrichment Of B Cereus Amentioning

confidence: 61%

“…Its spores have been isolated from most soils and sediments in numbers of several hundred colony-forming units (CFUs) per gram dry weight of soil (Watterson, 1985). However, the spore counts in polymetallic soils, especially those with high Au concentrations, were up to several orders of magnitude higher, indicating an unambiguous association of bacterial population with polymetallic soils (Watterson, 1985;Neybergh et al, 1991;Melchior et al, 1994Melchior et al, , 1996Wang et al, 1999). Due to their high oxidation potentials, most Au(I) and Au(III) complexes can act as strong bactericides even at low concentrations (Karthikeyan and Beveridge, 2002).…”

Section: Introductionmentioning

confidence: 93%

“…However, no geomicrobiological studies have been published on indicator organisms in Australia. The use of the soil bacterium Bacillus cereus as an indicator organism for Au and other metals has been explored in studies of different terrains in Belgium, China, Argentina and Mexico (Neybergh et al, 1991;Melchior et al, 1994Melchior et al, , 1996Wang et al, 1999). B. cereus is an aerobic sporeforming soil bacterium that displays a high metal and penicillin tolerance.…”

Section: Introductionmentioning

confidence: 99%

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Bacillus cereus, gold and associated elements in soil and other regolith samples from Tomakin Park Gold Mine in southeastern New South Wales, Australia

Reith

McPhail

Christy

2005

Journal of Geochemical Exploration

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Section: Bulk Geochemistry Mineralogy and Enrichment Of B Cereus Amentioning

confidence: 61%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Bacillus cereus, gold and associated elements in soil and other regolith samples from Tomakin Park Gold Mine in southeastern New South Wales, Australia

Reith

McPhail

Christy

2005

Journal of Geochemical Exploration

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“…In previous studies, elevated numbers of B. cereus spores also were detected in auriferous soils from Belgium, China, Argentina, and Mexico, and the use of B. cereus as a bioindicator for Au exploration has been proposed (18,19). A significant increase in the number of B. cereus spores in auriferous soils from Tomakin was observed (20).…”

Section: Discussionmentioning

confidence: 91%

“…In this study, a strong correlation between Zn and Cu concentrations, total biomass, and abundances of methanotrophic bacteria was observed (17). Using culture-based approaches, correlations between abundances of Bacillus cereus spores and the presence of Au and its pathfinder elements (i.e., As, Ag, Bi, Cu, Mo, Se, and Te) in soils overlying Au deposits in Belgium, the United States, and Australia have been observed (18)(19)(20). In Western Australian soils overlying Cu-Pb-Zn deposits, the solubilization, transport, and deposition of metals is mediated by resident plant and microbial communities (21,22).…”

mentioning

confidence: 99%

Geogenic Factors as Drivers of Microbial Community Diversity in Soils Overlying Polymetallic Deposits

Reith

Zammit

Pohrib

et al. 2015

Appl Environ Microbiol

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dThis study shows that the geogenic factors landform, lithology, and underlying mineral deposits (expressed by elevated metal concentrations in overlying soils) are key drivers of microbial community diversity in naturally metal-rich Australian soils with different land uses, i.e., agriculture versus natural bushland. One hundred sixty-eight soil samples were obtained from two metal-rich provinces in Australia, i.e., the Fifield Au-Pt field (New South Wales) and the Hillside Cu-Au-U rare-earth-element (REE) deposit (South Australia). Soils were analyzed using three-domain multiplex terminal-restriction-fragment-length-polymorphism (M-TRFLP) and PhyloChip microarrays. Geogenic factors were determined using field-mapping techniques and analyses of >50 geochemical parameters. At Fifield, microbial communities differed significantly with geogenic factors and equally with land use (P < 0.05). At Hillside, communities in surface soils (0.03-to 0.2-m depth) differed significantly with landform and land use (P < 0.05). Communities in deeper soils (>0.2 m) differed significantly with lithology and mineral deposit (P < 0.05). Across both sites, elevated metal contents in soils overlying mineral deposits were selective for a range of bacterial taxa, most importantly Acidobacteria, Bacilli, Betaproteobacteria, and Epsilonproteobacteria. In conclusion, long-term geogenic factors can be just as important as land use in determining soil microbial community diversity. Determining the drivers of microbial community composition in soils is challenging, because soils are complex ecosystems containing numerous ecological niches. This results in an immense diversity, with up to thousands of taxa per gram of soil (1). Land use, climate, vegetation, soil type, and anthropogenic pollution are strongly linked to soil microbial community structures, functions, and activities at many sites (2-4). In particular, agricultural practices are known to drive differences in soil microbial communities (5). Influences of geogenic factors, e.g., landform, underlying lithologies, and mineral deposits on soil microbial communities, have received little attention. However, three studies of soils from Switzerland and Nepal have shown that geological/mineralogical factors can significantly affect species assemblages and functions (6-8).A primary goal of geomicrobiological research is to link microbial communities and metal cycling in metallogenic environments and to determine how communities are structured due to metalassociated drivers (9). Microorganisms play a pivotal role in the biogeochemical cycling of many metals, particularly those essential for cell function, e.g., Co, Cu, Fe, Mg, Mn, Mo, Na, Ni, V, W, and Zn, and those oxidized or reduced in catabolic reactions to gain metabolic energy, e.g., As, Fe, Mn, Mo, Sb, Se, Sn, Te, U, and V (10). Therefore, metal-rich environments are useful model systems allowing links between microbial taxa and geochemical parameters to be identified (11).To date, mine tailing and acid mine drainage sites have been ...

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Microorganisms in Lianxian lateritic gold deposit in Guangdong and their effects on leaching of heavy metals

Chen

Liu

et al. 2005

Chin. J. Geochem.

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Geomicrobiology applied to mineral exploration in Mexico

Cited by 10 publications

References 4 publications

Bacillus cereus, gold and associated elements in soil and other regolith samples from Tomakin Park Gold Mine in southeastern New South Wales, Australia

Bacillus cereus, gold and associated elements in soil and other regolith samples from Tomakin Park Gold Mine in southeastern New South Wales, Australia

Geogenic Factors as Drivers of Microbial Community Diversity in Soils Overlying Polymetallic Deposits

Microorganisms in Lianxian lateritic gold deposit in Guangdong and their effects on leaching of heavy metals

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