Venezuela

FileMercury Pollution from Artisanal Gold Mining in Block B, El Callao, Bolivar State, Venezuela: Health and Technological Assessment
The technical and health aspects of the gold mining activity conducted by artisanal and small-scale miners in the Block B, El Callao, Bolivar State, Venezuela, were evaluated. The population of Block B is estimated to be around 1730 people, with about 30% of children with age below 15 and the large majority of the adults directly involved in mining. About 1/5 of the population is illiterate and 1/4 does not have any kind of technical education. The area is a legal mining concession of CVG-Minerven rented to small-scale mining individuals/companies. Miners extract the ore from 30-80 m deep shafts using explosives and transport it in small trucks to the Processing Centers (locally known as “molinos”) to be crushed, ground, concentrated and amalgamated.
FileAdvisory Assistance on Avoidance Mercury Pollution from Artisanal Gold Mining Operation in Bolivar State, Venezuela
Mercury has been misused by artisanal miners all over the State of Bolivar. A gold production in Venezuela of around 18 tonnes annually likely results mercury emission in the same magnitude. Symptoms of mercurialism in miners and gold dealers were already detected by various researchers. he high content of organic acids in sediments and waters of the Caroni River and other darkwater streams favours oxidation of metallic mercury dumped by mining activities or precipitated from the atmosphere. Soluble Hg-organic complexes can be transformed into methylmercury and quickly taken up by aquatic biota. Bioaccumulation occurs predominantly by food intake rather than via fish respiration. In some mining areas the process is occurring at slow rates but more information is needed.
FileMercury Bioaccumulation by Aquatic Biota in Hydroelectric Reservoirs: Review and Consideration of the Mechanisms
The mercury bioaccumulation process in man-made reservoirs is a phenomenon recently (1969) recognized in several countries such as USA, Canada, Sweden, Finland, Brazil. In many cases, no specific pollution source is identified and many occurrences of elevated Hg levels in tissues of fish have been detected in regions considered to be remote from sources of Hg. In impoundments the increase of mercury bioavailability are usually related with quality and amount of flooded vegetation, bacterial activitiy in sediments and high level of humosity of the surface waters. Dissolved organic acids, abundant in darkwater aquatic systems, increase the reactivity of all forms of mercury both present in flooded sediments and deposited from atmosphere. The recent discovery of water-soluble species of mercury in the atmosphere, usually produced by coal-wood combustion, named reactive gaseous mercury (RGM), has heightened concerns that this form of mercury can react quickly in large surface reservoirs increasing the bioavailability of the pollutant. It has also been demonstrated the capability of some organisms of methylating mercury organic complexes in their intestines.
FileMercury Pollution from Artisanal Gold Mining in Block B, El Callao, Bolívar State, Venezuela
The technical and health aspects of the gold mining activity conducted by artisanal and small-scale miners in the Block B, El Callao, Bolívar State, Venezuela, were evaluated. The area, with 1731 inhabitants, is a legal mining concession of CVG-Minerven rented to small-scale mining individuals/companies. Miners extract the ore from 30-80 m deep shafts using explosives and transport it in small trucks to the Processing Centers (locally known as “molinos”) to be crushed, ground, concentrated and amalgamated. There are 28 active Processing Centers in the Block B area producing about 1 to 2 tonnes Au/a. By using copperamalgamating plates to amalgamate the whole ground ore, a large amount of mercury is lost with the tailings.
FileMercurio y Cianuro en Minería Artesanal de la Provincia de El Oro, Ecuador (Presentación)
Descripción de la Presentación: • Proceso de extracción del oro en la minería artesanal en Ecuador. • Relación Oro producido-Mercurio gastado • Balance y destino del Mercurio. • Mercurio en aire exalado en la Minería Artesanal del Ecuador. • Proceso de Cianuración • La minería y el Ecosistema
FileMercurio y Enfermedades Inmunológicas en Comunidades de Minería Artesanal de Oro: ¿Una Interacción Peligrosa?
Presentacion.
FileUniidades de Demonsttraciión y Campaña de Educaciión para Miineros Arttesanalles de Oro
Presentacion.
FileContaminación por mercurio en la minería artesanal en el Bloque B de El Callao: Evaluación de la salud
Presentacion.
FileIntroducción de Tecnologías Limpias en la Minería Artesanal de Oro
Presentacion.
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