Planejamento para o fechamento prematuro de minas

Sánchez, Luís Enrique

doi:10.1590/s0370-44672011000100016

Cited by 12 publications

(11 citation statements)

References 9 publications

(4 reference statements)

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“…However, at the time of closure, the mine still had mineral reserves of about 1,250,000 tons, whose extraction was not considered economically viable, as they were located under the ore beneficiation plants, typifying one of the forms of early closure (Sánchez, 2011), before exhaustion of mineral reserves.…”

Section: History Of the Minementioning

confidence: 99%

The long post-closure period of a kaolin mine

Jesus

Sánchez

2013

Rem: Rev. Esc. Minas

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ResumoCom a intenção de se derivarem recomendações, para uma boa prática de fechamento de mina, esse artigo examina o caso de uma mina de caulim, cujas atividades extrativas foram encerradas há mais de dez anos, e que, ainda, não se encontra satisfatoriamente recuperada, segundo os critérios do órgão ambiental. Foi constatado que (i) as medidas típicas de recuperação de áreas degradadas (reafeiçoamento topográfico, controle de erosão e repovoamento vegetal) somente foram realizadas a contento depois de retrabalho e a custos mais elevados que o estimado, e (ii) a qualidade da água subterrânea foi afetada durante as operações, o que levou a mina a ser inserida no cadastro estadual de áreas contaminadas. A mina, ainda que de pequeno porte, ilustra alguns tipos de problemas a serem enfrentados, para o fechamento de minas no Brasil: (1) falta de clareza quanto aos objetivos de recuperação ambiental, (2) necessidade de gerir o passivo representado por áreas contaminadas, (3) perda de memória organizacional. As principais recomendações de boa prática se referem a sanar as deficiências encontradas. Esse caso, relativamente simples -uma mina de pequeno porte localizada em uma região metropolitana com intensa dinâmica urbana -, nos ensina que a desativação e o fechamento não podem ser improvisados ou tratados como atividades simples ou triviais, na mineração. Ao contrário, requerem planejamento cuidadoso e integração com o próprio planejamento da mina. Palavras-chave: Fechamento de mina, recuperação de áreas degradadas, áreas contaminadas. AbstractAiming at deriving good practice recommendations for mine closure, this paper reviews the case of a kaolin mine whose production ceased more than ten years ago, but as yet didn't meet its completion criteria. Document review, interviews and site visits showed that: (i)

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Section: History Of the Minementioning

confidence: 99%

The long post-closure period of a kaolin mine

Jesus

Sánchez

2013

Rem: Rev. Esc. Minas

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“…However, in view of the need to recover areas of altitude fields after mining activities (BRASIL, 1988;SÁNCHEZ, 2011), among other environmental degradation situations, it is necessary to investigate techniques to make environmental recovery plans more efficient. The use of topsoil (RIVERA et al, 2012;GOLOS;DIXON, 2014) is a widespread technique in revegetation activities after bauxite mining (Barros, 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of Topsoil Stockpiling on the Viability of Seed Bank in Field Phytophysiognomies Campos De Altitude

Moraes

Carvalho

Pereira

et al. 2017

CERNE

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ABSTRACT:The viability of propagules during topsoil stockpiling is a limiting factor in ecological restoration projects and little is known about the species distributed in the campos de altitude. This work was carried out to investigate the viability of propagules present in the topsoil under campos de altitude vegetation, stockpiled for up to 12 months after the stripping of areas to be mined. In the south of Minas Gerais, Brazil, between November 2011 and November 2012, four collections of the seed bank were carried out, considering three depths (0 to 10, 90 to 100, and 190 to 200 cm) of the plot of stockpiled topsoil. Using the multivariate analysis, it was verified that the depth factor does not statistically affect the abundance of emerged individuals, while the factor time of stockpiling negatively affects the viability of the seeds. Some species were affected by the stockpiling conditions, only emerging in some collections, while others (Achyrocline satureioides, Ageratum fastigiatum, Baccharis dracunculifolia, Borreria capitata, Echinolaena inflexa and Melinis minutiflora) had individuals emerged in all collection periods. This study points out the need for the return of the topsoil until the fourth month of stocking, under the risk of monodominance, with a prevalence of species more adapted to predominant conditions of campos de altitude. EFEITO DA ESTOCAGEM DE TOPSOIL NA VIABILIDADE DO BANCO DE SEMENTES EM FITOFISIONOMIAS DE CAMPOS DE ALTITUDE RESUMO:A viabilidade dos propágulos durante a estocagem de topsoil é um fator limitante em projetos de restauração ecológica, e pouco se sabe sobre as espécies distribuídas nos campos de altitude. Este trabalho foi realizado com o objetivo de investigar a viabilidade de propágulos presente no topsoil sob vegetação de campos de altitude, estocado por até 12 meses após o decapeamento de áreas a serem mineradas. Entre o período de novembro de 2011 a novembro de 2012 foram realizadas quatro coletas do banco de sementes, sendo consideradas três profundidades (0 a 10, 90 a 100 e 190 a 200 cm) da leira de topsoil estocada. Utilizando a análise multivariada, verificou-se que o fator profundidade não afeta estatisticamente a abundância de indivíduos emergidos, enquanto o fator tempo de estocagem afeta negativamente a viabilidade das sementes. Algumas espécies foram afetadas pelas condições de estoque do topsoil, emergindo somente em algumas coletas, enquanto outras (Achyrocline satureioides, Ageratum fastigiatum, Baccharis dracunculifolia, Borreria capitata, Echinolaena inflexa e Melinis minutiflora) tiveram indivíduos emergidos em todos os períodos de coleta. Este estudo aponta a necessidade do retorno do topsoil até o quarto mês de armazenamento, sob o risco de ocorrer monodominância, com predominância de espécies mais adaptadas as condições campestres.

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“…Beyond the financial issues, there are other interests that guide the planning for the decommissioning of a mine, including the reclamation of the degraded environment, with the objective of achieving a positive balance for the region. There is a need to guarantee safeguards for shareholders, public authorities, the supply chain, local communities, and future generations, with regard to socioeconomic impacts and associated environmental liabilities (SÁNCHEZ, 2011). The net result is a positive spiral of growth and development.…”

Section: Introductionmentioning

confidence: 99%

Environmental Services Associated With the Reclamation of Areas Degraded by Mining: Potential for Payments for Environmental Services

et al. 2016

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This paper discusses the potential of associating environmental services (ES) with techniques for reclaiming degraded areas (RDA) used in the mining sector, considering the current trends in payments for environmental services (PES) in Brazil. A literature review with content analysis generated results which identified the ES generated for eight cases of RDA in mining. As an example, ES related to soil enhancement were found. A more extended review of general RDA techniques confirmed the potential for associating other ES to RDA techniques used in mining, an example here is the enhancement of carbon stocks. Support for actions could come from existing PES schemes, particularly for cases where the ES identified as associated with an RDA technique are related to soil and water conservation. Concluding remarks indicate that there is a potential scenario for ES diversification in the reclamation stage of mining operations. A first step towards accomplishing this diversification envisages the creation of a PES scheme specific to the mining sector. Further studies are needed to develop criteria for fostering a PES scheme specifically for the reclamation phase of mining operations in Brazil.

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Planejamento para o fechamento prematuro de minas

Cited by 12 publications

References 9 publications

The long post-closure period of a kaolin mine

The long post-closure period of a kaolin mine

Effect of Topsoil Stockpiling on the Viability of Seed Bank in Field Phytophysiognomies Campos De Altitude

Environmental Services Associated With the Reclamation of Areas Degraded by Mining: Potential for Payments for Environmental Services

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