Modelagem e simulação numéricas do processo de drenagem em mina a céu aberto.

Abstract

The present work aims to perform a modeling, based on the finite difference numerical method through the MODFLOW groundwater flow model, which is incorporated into the PMWIN Pro program. A fictitious case of excavation of a waterhole was initially simulated. building to know and better understand the problems involved in the numerical modeling of the dewatering procedure and subsequently apply to the real case, a kimberlite mine that is currently being planned to be explored, project titled Victor Diamonds from DeBeers Canada in Ontario province in the Canada The data used for this dissertation were obtained from report produced by Hydrologic Consultants, Inc. (HCI) which developed a in-depth study on the above-mentioned underground flow mine as well as the creation of a groundwater flow simulation model based on the element method finite. The mineral of interest of the enterprise is the diamond which is located within two adjacent kimberlite chimneys. Kimberlite chimneys are crossing layered rock formations that reach a depth of approximately 200 meters. It will be necessary to plan a pit dewatering system to enable mining work as the groundwater level in the project region is located near the surface of the ground. With the model it will be possible to construct probable scenarios making it possible to predict a lowering of groundwater levels as well as their manipulation through adequate pumping rates ensuring as much as possible a pit without the presence of water during mining. The alternative simulation performed in this study using the MODFLOW program yielded satisfactory results very similar to the simulation results performed by Hydrologic Consultants, Inc., which can be confirmed by the results obtained and represented by potentiometric maps, vertical section of the excavated mine. , extension of the lowering cone during the four pumping stations and the lowering curve inside the excavated Victor mine.