Explore a comprehensive presentation on drillhole spacing analysis using simulated information delivered by Ian Glacken, Executive Consultant at Snowden Optiro, during the Geology Symposium 2022 in Perth. Delve into the importance of optimizing drill spacing for grade control and minimizing drilling costs to achieve indicated resources. Examine the principles of value optimization, including revenue, planned mining cost, ore loss, and dilution. Understand the consequences of misclassification and the benefits of using simulation techniques. Learn about multivariate simulation (MVS) and its application to various minerals. Follow a detailed case study on copper-nickel mineralization, exploring the multivariate simulation workflow from raw data inputs to post-processing of OK models. Analyze misclassification maps and interpret results showing drilling cost differences for various grids, misclassification examples, and drilling revenue patterns.