Proposta de retomada e expansão para uma mina de calcário

Abstract

The contents and tonnages of the ore of interest and the amounts of sterile present in a mineral deposit have a direct influence on the decision of a mining investment, as well as to what stage of its development this undertaking will be viable or not. The objective of this work is to propose a plan for the resumption of activities and expansion of the pit of a limestone mine, being directly related to the quantitative and qualitative analysis of the ore body, the amounts of sterile and the operational parameters of the pit progress. In order to meet the proposed objective, data from the survey campaign carried out in the area where the cava was intended to be used, together with data collected from topography, geology and geochemistry, were used as the basis for the delineation of the geological body design. The three-dimensional design of the body was discretized in blocks, for which the volumes and percentages of interest were calculated, in this case, the Neutralization Power (PN) of the limestone by the Inverse Distance Square (IQD) method. Finally, the operational parameters of the cava already in operation were used as a basis for the development of the cava recurrence plan. Two cavas were designed, one restricted by the sterile pile located near the advancement area to the east of the pit, and another without this restriction, being the decision on which to implement, using economic criteria, appropriate to the company.