Gold Dissolution from Ore with Iodide-Oxidising Bacteria

2019-3-12 · Gold leaching from ore using iodide-iodine mixtures is an alternative to gold cyanidation. This study evaluated the ability of iodide-oxidising bacteria to solubilise gold from ore that was mainly ...

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Bacterial biofilms on gold grains—implications for …

Maria Angelica Rea, Carla M. Zammit, Frank Reith, Bacterial biofilms on gold grains—implications for geomicrobial transformations of gold, FEMS Microbiology Ecology, Volume 92, Issue 6, ... the Hit or Miss Mine and the Tomakin Park Gold Mine is the aurophillic bacterium C. metallidurans (AuOTU27); with D. acidovorans (AuOTU28) ...

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Bacteria Found to Thrive on Gold

2013-2-4 · The molecule with which the bacteria create the particles could one day be used to collect gold from mine waste, says Frank Reith, an environmental microbiologist at the University of Adelaide in ...

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Frontiers | Leaf Epiphytic Bacteria of Plants Colonizing …

The study of leaf epiphytic bacteria of plants colonizing mine residues containing PTE is thus a key to understand and exploit plant-epiphytic bacteria interactions for air phytoremediation purposes. ... Then, samples were covered with a 15-nm gold layer. Images were taken from both upper and underside of leaves (abaxial and adaxial ...

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2.8-Billion-Year-Old Spheres Found in South …

2014-8-29 · In 1984, while investigating the spheres, he contacted Roelf Marx, curator of the museum of Klerksdorp, South Africa, where some of the spheres are kept. Marx described the spheres as being about 2.8 billion years old, with …

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Gold Mining Bacteria

2006-7-16 · Anonymous 49''er writes "Nature is reporting that bacteria found in Australian gold mines are capable of extruding tiny invisible ''secondary grains'' from soil and alluvial systems. From the article: "Potential applications -- from sensing the bacteria as a way to look for gold mines, to using them to help make industrially useful particles of gold -- may be some way off.

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Occupational radiation exposure to norms in a gold mine

Preliminary studies have been conducted into the occupational radiation exposure to NORMS from surface and underground mining operations in a gold mine in the Ashanti Region of Ghana. A brief description of the methods and instrumentation is presented. The annual effective dose has been estimated to …

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Effect of solar radiation on survival of indicator bacteria in …

Pseudomonas aeruginosa was shown to be the most sensitive indicator bacterium among the tested microorganisms. Results show a significant correlation between radiation intensity and reduction rates. Best elimination of microorganisms occurs on the water surface; with increasing water depth, there is less UV radiation to inactivate bacteria.

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Heavy Metal Pollution from Gold Mines: Environmental …

2016-10-26 · Bacteria able to withstand high concentrations of these heavy metals are found in the environment as a result of various inherent biochemical, physiological, and/or genetic mechanisms. ... This review focuses on the effects of heavy metal wastes generated from gold mining activities on the environment and the various mechanisms used by bacteria ...

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Radiation efficiency and apparent stress of small …

2005-1-18 · [1] Nine triaxial borehole accelerometers were installed within 200 m along a 2650-m-deep haulage tunnel in the Mponeng gold mine in South Africa. We analyzed the high sample rate recordings (15 kHz) to determine source parameters of small earthquakes in the mine. To study the source processes, we carried out multiple time window waveform inversions for five larger …

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Mercury Contamination from Historical Gold …

2016-11-29 · Use and Loss of Mercury in Gold Mining . To enhance gold recovery from hydraulic mining, hundreds of pounds of liquid mercury (several 76-lb flasks) were added to riffles and troughs in a typical sluice. The high density of …

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Extreme bacteria lurking in gold mines

2014-5-19 · Kay - In 2010, there was a paper that was published about a worm found in fissure water one of the mines. This is one of the biggest discoveries to date because before that, we only found bacteria. So, that gave an indication …

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Mining and Water Pollution — Safe Drinking Water …

2016-12-17 · 3. Processing Chemicals Pollution. This kind of pollution occurs when chemical agents (such as cyanide or sulphuric acid used by mining companies to separate the target mineral from the ore) spill, leak, or leach from the mine site into nearby water bodies. These chemicals can be highly toxic to humans and wildlife. 4.

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Isolation and characterization of cellulose-degrading …

The present study investigated the cultivable mesophilic (37 degrees C) and thermophilic (60 degrees C) cellulose-degrading bacterial diversity in a weathered soil-like sample collected from the deep subsurface (1.5 km depth) of the Homestake gold mine in Lead, South Dakota, USA. Chemical characteri …

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Water Pollution and Contamination from Gold Mines: Acid …

2020-7-24 · South African environmentalists have termed Acid Mine Drainage as the "single most significant threat to South Africa''s environment" (Naidoo, 2009) and according to Dr Anthony Turton, formerly a scientist at the Council for Scientific and Industrial Research (CSIR) and the director of Touch Stone Resources—a company committed to uplifting South Africans'' survival …

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Guidance about radiation safety on mining operations

Mines, concentrators and smelters where you sometimes find radioactive materials are those handling tin, tantalum and niobium, gold, tungsten or molybdenum. Dust management during mining and processing is a key step in minimising occupational exposure to radiation and containing the spread of radioactive material.

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One is the loneliest number for mine-dwelling bacterium

2008-10-9 · The lonely bacteria were found 2.8 km below the ground in a South African gold mine, in water coming from a rock fracture (white area). Credit: Li …

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The Effect of Radioactive Radiation on Growth Inhibition …

2022-4-16 · The Effect of Radiation on Bacterial Spores. The effect of americium-beryllium source radiation on bacterial sporulation is shown in Fig. 3.According to this chart, a reduction in the number of spores of B. cereus has been observed. The use of gamma radiation in the inactivation of Bacillus anthracis spores was first reported in 1959 by Horne et al. [].

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Bacterial oxidation of an arsenical gold sulphide …

1990-1-1 · In this study the bacterial oxidation of an extremely refractory gold sulphide concentrate, from Olympias, Greece, is examined. Leaching tests were conducted in air-stirred pachuca reactors in order to determine the effect of pulp density on the degree of pyrite and arsenopyrite oxidation. Cyanidation tests were conducted in order to determine ...

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An Assessment of Radiological Hazards from Gold Mine …

2016-1-18 · The study area is a gold mining area situated about 70 km west of Johannesburg in the province of Gauteng in South Africa. It lies between 26°18''S–26°26''S latitude and 27°23''E–27°31''E longitude. Gold exploration in the area dates back to 1898, and mining has occurred since 1945 [ 7 ].

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Top active mines in Ontario | Mining & Energy

2019-8-7 · This open-pit/underground mine is one of Canada''s largest gold producers and is a major local employer. Red Lake Mine Location: Red Lake, Ontario Owner: Gold Corp. Inc. The Red Lake Mine is one of the most …

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Extreme bacteria lurking in gold mines

2014-5-19 · Kay - In 2010, there was a paper that was published about a worm found in fissure water one of the mines. This is one of the biggest discoveries …

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Discover Interview: Tullis Onstott Went 2 Miles Down

2012-6-25 · Bacteria found in gold mines and frozen caves show the extreme flexibility of life, and hint at where else we might find it in the solar system. By Valerie Ross Jun 26, 2012 12:00 AM Onstott keeps a sealed workspace in his lab at high temperature and free of oxygen—just like home for the bacteria he studies. | Photo: Jess Dittmar

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Mining: Bacteria with Midas touch for efficient gold …

2017-4-28 · Mining: Bacteria with Midas touch for efficient gold processing Date: April 28, 2017 Source: University of Adelaide Summary: Special ''nugget-producing'' bacteria may hold the key to more efficient ...

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Bacteria from Earth can survive in space, study says | CNN

2020-8-26 · A type of bacteria found on Earth that is highly resistant to radiation and other environmental hazards survived outside of the International Space Station for three years, according to a new study.

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L-form bacteria, cell walls and the origins of life …

2013-1-1 · The idea that bacteria underwent a major radiation following the invention of the wall predicts that it should be possible to discern a pathway of emergence of the major modern bacterial groups, in parallel with an …

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Bacteria Found Nearly 2 Miles Underground | Live Science

Heavy Metal Pollution from Gold Mines: Environmental

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Bacteria Use Radioactive Uranium To Convert Water …

2006-10-19 · The bacteria rely on radioactive uranium to convert water molecules to useable energy. The discovery is a confirmed expansion of Earth''s biosphere, the three-dimensional shell that encompasses all ...

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20 bacterial superpowers or why bacteria are amazing

2022-7-3 · 6. Gold-producing bacteria (a highly valuable bacterial superpower!) Researchers found bacteria in gold mines in Australia that formed biofilms on gold particles. For example, bacteria like Delftia acidovorans and Cupriavidus metallidurans actively reduce toxic gold-ions to elementary gold. Hence, these bacteria are directly involved in the ...

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High frequency of antibiotic tolerance in deep subsurface …

2020-8-4 · The Rozália Mine, with its long mining history, could represent an environmental threat connected with metal contamination and associated antibiotic tolerance. Metal and antibiotic tolerance profiles of heterotrophic, cultivable bacteria isolated from the Rozália Gold Mine in Hodruša-Hámre, Slovakia, and the surrounding area were analysed. Subsurface samples …

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Two miles underground, strange bacteria are found thriving

2006-10-20 · The self-sustaining bacterial community, which thrives in nutrient-rich groundwater found near a South African gold mine, has been isolated from the Earth''s surface for several million years. It represents the first group of microbes known to depend exclusively on geologically produced hydrogen and sulfur compounds for nourishment.

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Kolar gold mines to be revived after nearly 2 …

2020-12-6 · The gold mines in Kolar are located about 100 km away from Bengaluru city. When it was operational, it was the world''s second deepest gold mine with mining activity being conducted at a depth of ...

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