The final geometry of open stopes often diverges from the design, creating unintentional volumes of overbreak and underbreak. Tools, such as the Stability Chart, are used for predicting overbreak, but its limitations regarding the precision of the predictions and the exclusion of underbreak have constrained the benefits of a predictive tool at the design stage. Furthermore, the economic aspects are not integrated when addressing geomechanical stope design. This paper presents how understanding and predicting stope performance at a meter-scale resolution through a multivariate model can be used for assessing the geotechnical (overbreak and underbreak) and economic stope performance. These predictions estimate the magnitude and location of overbreak and underbreak across the design surface, and are used to resolve the expected geometry of the mined void. The incorporation of a predicted mined void with grade values from a block model allows for a comprehensive economic stope performance estimate. This work is a significant step towards a stope design and planning process that minimizes the stability issues, dilution and loss of ore across the stope. As designing for higher ore recovery increases the potential for dilution and vice versa, this approach allows for the value realised from mining a stope to be maximised by quantifying this inherent economic trade-off. The enhanced resolution of both data and predictions has allowed for a more comprehensive evaluation of the predicted stope performance and economic outcomes during the design phase. This marks a notable advancement in the ability to design and plan the optimal stope.

中文翻译：

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使用场地协调数据以米级分辨率进行预测，通过经济和岩土工程评估来优化采场设计


露天采场的最终几何形状通常与设计不同，从而无意中产生超挖和欠挖体积。稳定图等工具用于预测超挖，但其在预测精度和排除欠挖方面的局限性限制了预测工具在设计阶段的优势。此外，在进行地质力学采场设计时，并未综合考虑经济方面的因素。本文介绍了如何通过多元模型以米级分辨率理解和预测采场性能，以评估岩土工程（超挖和欠挖）和经济采场性能。这些预测可估计整个设计表面超挖和欠挖的大小和位置，并用于解析开采空隙的预期几何形状。将预测的开采空洞与区块模型的品位值相结合，可以进行全面的采场经济绩效评估。这项工作是采场设计和规划过程中迈出的重要一步，可最大程度地减少采场内矿石的稳定性问题、贫化和损失。由于提高矿石回收率的设计会增加稀释的可能性，反之亦然，因此这种方法可以通过量化这种固有的经济权衡来最大化采场开采所实现的价值。数据和预测分辨率的提高使得能够在设计阶段对预测采场绩效和经济成果进行更全面的评估。这标志着设计和规划最佳采场能力的显着进步。