Abstract
Exploration for massive sulphide ore bodies at great depths in the Skellefte district in northern Sweden is expensive and relies heavily on extensive drilling operations. Different drilling strategies have been studied by mean simulation. The bedrock structure, the targets and the drilling procedure have been described by mathematical models. These models are based on known facts from the field. For some significant geological parameters assumptions about the statistical properties are made. A number of different drilling strategies are designed. Drilling campaigns are simulated in the model and the expected outcomes are calculated and compared. A case study is presented. Quantitative estimates of the optimal drilling pattern are obtained, the influence on the expected outcome when the geological parameters are varied as well as the cost-benefit relation for investments in the project are estimated.
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