Impact Of Mining
Mostrando 13-24 de 77 artigos, teses e dissertações.
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13. Physical stability of iron ore caves: geomechanical studies of a shallow underground cave in SE Brazil
Abstract Caves hosted in iron formations are attracting considerable interest due to their scientific and environmental value. Some of these caves are located in or near iron ore mine sites, which represent an important source of income to Brazil. However, the Brazilian legislation requires speleological studies that currently have an impact upon ore reserve
REM, Int. Eng. J.. Publicado em: 2019-06
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14. An integrated pit-to-plant approach using technological models for strategic mine planning of copper and gold deposits
Abstract The strategic mine plan is a crucial step for the success of mining companies, and for its development, it is necessary to use a number of inter-related variables that are usually estimated independently. These variables include operational data that is traditionally isolated in information islands between the different departments in the mine or th
REM, Int. Eng. J.. Publicado em: 2019-06
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15. NPV analysis of multiple surface constraints for pit expansion scenarios under geological uncertainty
Abstract To optimize a mining project, it is necessary to deal with several technical aspects and constraints, such as orebody modelling, reserve estimation, blending strategy, optimal and operational pit designs, cost control, environmental issues, among others. In this sense, locating surface infrastructures is one of the most critical mine planning concer
REM, Int. Eng. J.. Publicado em: 2019-06
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16. Bacterial communities in mining soils and surrounding areas under regeneration process in a former ore mine
Abstract Human activities on the Earth's surface change the landscape of natural ecosystems. Mining practices are one of the most severe human activities, drastically altering the chemical, physical and biological properties of the soil environment. Bacterial communities in soil play an important role in the maintenance of ecological relationships. This work
Braz. J. Microbiol.. Publicado em: 2018-09
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17. Occurrence of Yeast Species in Soils under Native and Modified Vegetation in an Iron Mining Area
ABSTRACT Soils of the Quadrilátero Ferrífero are rich in mineral resources, especially gold and iron. Soil management and mining activities greatly impact soil biology. However, studies addressed to the diversity of microorganisms and their ecological role in the recovery of these areas are scarce. This study aimed to assess the yeast occurrence in soils w
Rev. Bras. Ciênc. Solo. Publicado em: 26/07/2018
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18. The impact of payload truck factor use in mine performance reports for an open pit copper mine in Brazil
Abstract This article aims to evaluate the use of a truck factor for off-highway trucks in open pit mine operations, thus reducing error on material movement and mine production data entry. This method is current for a copper mine located in South East Pará, Brazil. With a dispatch system, the truck factor is calculated using three data inputs called measur
REM, Int. Eng. J.. Publicado em: 2018-07
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19. Durability of Soil-Cement Blocks with the Incorporation of Limestone Residues from the Processing of Marble
The great environmental impact caused by mineral production has forced mining and ornamental stone industries to acquire new concepts and technical solutions in order to develop eco-friendly and sustainable activities. In this context, this work aims to study the durability of soil-cement block with the incorporation of limestone residues from the processing
Mat. Res.. Publicado em: 04/06/2018
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20. Direct block scheduling under marketing uncertainties
Abstract Mineral projects are composed of geological, operational and market uncertainties, and reducing these uncertainties is one of the objectives of engineering. Most surveys assess the impact of geological and operational uncertainties on the mining planning. The objective of this work is to study the impact of market uncertainty on the mineral activity
REM, Int. Eng. J.. Publicado em: 2018-04
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21. Improving short-term grade block models: alternative for correcting soft data
Abstract Short-term mining planning typically relies on samples obtained from channels or less-accurate sampling methods. The results may include larger sampling errors than those derived from diamond drill hole core samples. The aim of this paper is to evaluate the impact of the sampling error on grade estimation and propose a method of correcting the impre
REM, Int. Eng. J.. Publicado em: 2018-03
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22. Contamination and Soil Biological Properties in the Serra Pelada Mine - Amazonia, Brazil
ABSTRACT Discovered in 1980 and unleashed an utter gold rush of the modern era, Serra Pelada was the largest open-air mine in Brazil. About 80,000 gold prospectors worked there until 1984, when the gold pits were flooded. The environmental impact caused by mining inflicted irreversible damage to the ecosystem, with the formation of a large lake and piles of
Rev. Bras. Ciênc. Solo. Publicado em: 15/02/2018
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23. Incorporation of geological uncertainty in pit optimization with geostatistics simulation
Abstract Risk mapping processes in mine planning and ore recovery are constantly used in the mining industry to increase decision making certainty based on the available information. However, it is not possible to predict the risk behavior in all of the project's boundary conditions and small variations in some of these conditions can cause a great impact on
REM, Int. Eng. J.. Publicado em: 2017-09
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24. Diversity and Efficiency of Rhizobia Communities from Iron Mining Areas Using Cowpea as a Trap Plant
ABSTRACT Mining is an important economic activity. However, its impact on environment must be accessed, mainly on relevant processes for their sustainability. The objective of this study was to evaluate the diversity and efficiency of symbiotic nitrogen fixing bacterial communities in soils under different types of vegetation in the Quadrilátero Ferrífero:
Rev. Bras. Ciênc. Solo. Publicado em: 24/08/2017