The Osamu Utsumi Mine of the Indústrias Nucleares do Brasil (INB), located in Caldas/MG, extracted and processed uranium from 1982 to 1995, after which, operations were suspended, leaving INB with the liability for mine closure, part of which includes problems with acid drainage from the pit, waste dumps and tailings beach. Acid mine drainage (AMD) at the Osamu Utsumi Mine is relevant because of its environmental impact and its neutralization cost. In December, 2004, INB signed an agreement to prepare and present a closure plan according to IBAMA and CNEN requirements. Since that time several studies are in place in order to subsidise the preparation of the closure plan. This paper presents the study of the best alternative for closing the "Bota-Fora" BF-4, due its AMD generation potential, using the Multiple Account Analysis (MAA) methodology.
Multiple account analysis; waste dump; mine closure
