آخرین محصولات

Aquatic Mercury Pollution from Artisanal and …

In sub-Saharan Africa (SSA), unregulated artisanal and small-scale gold mining (ASGM) contributes up to 20% of global gold production and uses 205–496 tonnes/yr of Hg.

Protesters Demand That Sudan Armed Forces Stop Gold Mining…

Dordeib's open pits store mining waste that contains cyanide and mercury, two toxic chemicals used to extract gold from the associated ore. Red Sea State residents fear the waste pits will poison the water supply of nearby communities. Sudan outlawed the use of cyanide and mercury in gold mining in 2019, but the waste ponds remain.

Mercury emissions from point sources in South Africa

As a first step towards assessing Hg levels in a systematic approach in South Africa, representatives from the South African government, academia, research councils and key industries recently initiated a South African Mercury Assessment (SAMA) Programme (Leaner et al., 2006).

Illegal mines, pollution and a thirsty global market: Anger

In just the first half of this year, 36% of the gold produced in Ghana came from legal small-scale mines, with a value of around $1.7 billion, according to Ghana's Ministry of Land and Resources ...

South Africa second biggest global contributor of mercury …

In 2006 it was reported that mercury emissions in South Africa were second only to China, contributing more than 10% of global mercury emissions. This was reportedly mainly from coal combustion (releasing the mercury that occurs naturally in coal) and gold mining.

Mercury and metals in South African precipitation

Gold mining operations in South Africa mainly use the MacArthur Forrest process that uses cyanide instead of mercury amalgamation for extraction (Naicker et al., 2003). However, there are traces of Hg in the ore that could be released during processing but the overall emission is considered small ( Leaner et al., 2009 ).

The impact of post gold mining on mercury pollution in the …

The impact of historical use of mercury (Hg) for the extraction of gold was assessed in watersheds from an abandoned mine in Randfonetin, a town located at 45 km west of …

Mercury and Mining in Africa with Special Reference to Tanzania

A study of gold (Au) mining areas in Tanzania is being undertaken to assess environmental impacts arising from the use of mercury (Hg) in gold extraction. Initial results already indicated the presence of elevated Hg concentrations in environmental samples from the mining areas. The mean Hg concentration in river sediments in 4.19 µg/l. soils within gold mining and …

Mercury pollution on tourist beaches in Durban, South Africa…

Mercury (Hg) is a potential neurotoxin that is pervasive in the environment and is naturally sourced from volcanic eruptions, rock weathering and hydrothermal circulations (Acquavita et al., 2021).However, in recent times, anthropogenic releases from coal combustion, mining, industrial waste discharges, chemical fertilizers and agriculture, improper domestic …

Spatial Distribution and Source Identification of …

Mercury in South Africa occurs together with t he gold ore, rang ing from 1.2 to 4.6 wt. % [1]. The amalgamation process used f or gold mining up until 1920 is currently used by increasing ...

Use of Metallic Mercury in Artisanal Gold Mining by …

Historical mercury (Hg) discharged into the environment as a result of gold mining activities plotted as a function of selected geographical locations and time of mining activities.

Mercury exposure in a low-income community in South Africa

Objectives: To establish whether a specific community in a gold mining area, with potentially associated small-scale gold mining activities, was exposed to mercury. Methods: The community was situated in Mpumalanga, where some potential sources of mercury emissions may have an impact. Adults >or=18 years were considered eligible. Biological monitoring, …

Mercury exposure in a low-income community in South Africa …

2010, South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde. To establish whether a specific community in a gold mining area, with potentially associated small-scale gold mining activities, was exposed to mercury. The community was situated in Mpumalanga, where some potential sources of mercury emissions may have an impact.

Mercury and metals in South African precipitation

Mercury in precipitation in South Africa is comparable to Northern Hemispheric sites. Metal concentrations are higher at the urban Pretoria site compared to Cape Point. …

Metal Oxide-Based Adsorbents for Removal of Mercury in

Occupational contact majorly involves the exposure of humans to Hg 0 (i.e. elemental mercury) in Hg-related industrial processes such as Hg catalysts at chloralkali …

The emission of mercury from gold-reduction works in South …

The amount of mercury lost to the atmosphere by this mechanism appears to be less than 200 kg per year throughout the gold-mining industry in South Africa. Virtually no mercury vapour …

Water pollution in Ghana has reached alarming levels, with …

The pollution is particularly severe in the south-western parts of the country, where illegal mining activities, known locally as "galamsey," are widespread [2]. ... Elliot Tanner reports that mercury from mines is killing people, with a tripling of kidney disease cases in the Ashanti region over the past decade[5]. ... The Small-scale Gold ...

Operation Mercury and Illegal Mining in Latin America

The scale is staggering." 7 Furthermore, then Deputy Assistant Secretary of State for International Narcotics and Law Enforcement Affairs, Richard Glenn, stated, "since 2010 50,000 children have been forced to work in the illegal gold mines or subjected to trafficking in the mining camps in the Madre de Dios and Puno regions" of Peru ...

Use of Metallic Mercury in Artisanal Gold Mining by …

South Africa experienced a gold rush following gold discovery in Lyndenburg, Witwatersrand and other localities. Similarly, Hg amalgamation was the method of choice for gold extraction. ... L. Influence of illegal gold mining on mercury levels in fish of North Sulawesi's Minahasa Peninsula, (Indonesia). Environ. Pollut. 2001, 114, 299–302 ...

A review of mercury pollution in South Africa: current status

Generally, higher Hg concentrations were measured in environmental compartments impacted by the major anthropogenic Hg sources which, in South Africa, are largely represented by …

South Africa's Harmony Gold eyes up $2bn Ravenswood mine

Harmony Gold Mining is understood to have expressed interest in an acquisition of the $2bn Ravenswood Gold Mine that's being sold by EMR Capital and GEAR. DataRoom (at The Australian) understands that the $11bn South African-listed gold miner is keen to buy the Queensland asset that Azure Capital and UBS have been appointed to sell.

Review: Artisanal Gold Mining in Africa—Environmental …

Multiple toxic hazards, primarily PTEs such as As (arsenic), CN (cyanide), Cr (chromium), Cd (cadmium), Hg (mercury), and Pb (lead); silica (SiO 2); and physical hazards, …

Hazards identified and the need for health risk …

Although mining is a cornerstone of the South African economy (), it generates copious amounts of dust. 1 The dusts may be toxic since they may also be contaminated with various toxic metals.For this reason, the prevalence …

Health Risk Assessment of Heavy Metals in Soils from Witwatersrand Gold

The study evaluates the health risk caused by heavy metals to the inhabitants of a gold mining area. In this study, 56 soil samples from five mine tailings and 17 from two mine villages were collected and analyzed for Asernic (As), Lead (Pb), Mercury (Hg), Cadmium (Cd), Chromium (Cr), Cobalt (Co), Nickel (Ni), Copper (Cu) and Zinc (Zn) using ICP-MS. Measured …

The impact of post gold mining on mercury pollution in …

The impact of historical use of mercury (Hg) for the extraction of gold was assessed in watersheds from an abandoned mine in Randfonetin, a town located at 45 km west of Johannesburg (South Africa ...

Heavy Metal Pollution from Gold Mines: Environmental …

Mercury amalgamation was the initial method used for centuries to process gold and is still in use today by artisanal and small-scale gold mining (ASGM). Globally, ASGM is the second largest …

Red Mercury Suppliers In South Africa

South Africa is phasing out products containing mercury, with the aim of banning the import, export, and manufacturing of certain goods by April 2023. What is mercury used for in South Africa? Approximately 20,000 miners participate in artisanal smallscale gold mining (ASM) activities in South Africa.

Mercury concentrations in water resources potentially …

Total mercury (TotHg) and methylmercury (MeHg) concentrations were determined in various environmental compartments collected from water resources of three Water Management Areas (WMAs) - viz. Olifants, Upper Vaal and Inkomati WMAs, potentially impacted by major anthropogenic mercury (Hg) sources (i.e coal-fired power stations and artisanal gold mining …

A Step Towards Sustainable Gold Mining in Africa: Mercury …

By Ayele Addis Ambelu (News and Program producer) +251918718307 "In many African small-scale gold mining communities, the reliance on mercury for gold extraction poses severe environmental and health challenges. According to recent reports by researchers and community experiences, mercury pollution has contaminated water sources, posing risks …

emission of mercury from gold-reduction works in …

concentrations of mercury were found at any stage of the process. The amount of mercury lost to the atmosphere by this mechanism appears to be less than 200 kg per year through-out the gold-mining industry in South Africa. . . . ... Virtually no mercury vapour could be detected m the air m the smelt-hc;>use. Slight mc~eases I~mercury concen-

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