Caves and Mining in Brazil: The Dilemma of Cave Preservation Within a Mining Context

Citation

Material Information

Title:
Caves and Mining in Brazil: The Dilemma of Cave Preservation Within a Mining Context
Series Title:
Environmental Earth Sciences
Creator:
Auler, A. S.
Piló, L. B.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Buffer Zone ( local )
High Relevance ( local )
Karst Feature ( local )
Mining Project ( local )
Maximum Relevance ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The exploitation of mineral reserves in Brazil, especially limestone and iron ore, is currently restricted due to the existence of caves. The vast majority of caves documented in the country over the last 4 years (approximately 3,000) have been identified through environmental studies conducted for mining operations. To determine whether a cave should be protected or not, a series of criteria were formally established by recent (2008/2009) federal laws. Four classes of cave relevance were formally designated, based primarily on geological and biospeleological criteria. Maximum Relevance caves must be protected, together with a 250 m buffer zone. High Relevance caves may be removed, provided that two other high relevance caves, preferably within the same geological unit and containing similar characteristics, are permanently protected. However, the acquisition of areas containing caves, especially within iron ore regions, has become extremely difficult due to the high price of iron ore. Medium Relevance caves may be subject to removal, but speleological compensation must be applied. Low Relevance caves may be mined with no need for environmental compensation. Although these laws occasionally permit cave destruction, their ambiguous specifications and numerous criteria produce a highly restrictive scenario in which approximately 85 % of all caves are categorized as Maximum or High Relevance. The situation is further exacerbated by the very low minimum length of 5 m for any void to be classified a cave, producing a high number of caves regardless of lithology. Conducting a full cave environmental study, besides being financially costly, takes approximately 1.5 years to complete, primarily due to the requirement to perform two biospeleological sampling events during dry and wet seasons. The protection of several caves within mining areas has significantly decreased access to exploitable reserves, causing caves to remain under severe economic pressure. While Brazilian law emphasizes cave preservation, it provides no s

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Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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University of South Florida
Karst Information Portal

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