Grade control is a crucial step in the gold production chain, aimed at ensuring the quality and profitability of mining operations. However, a number of errors can compromise its effectiveness. Here are the main errors observed in grade control, affecting the entire gold production circuit: 1. Inadequate or unrepresentative sampling Poor sampling can lead to erroneous estimates of gold content. This is particularly problematic in deposits with high heterogeneity or a marked nugget effect. Sampling errors can lead to reconciliation problems between forecasts and actual production. 2. Incorrect geological modeling Geological modeling based on insufficient or poor-quality data can lead to errors in resource and reserve estimates. This affects mine planning and can lead to the mining of uneconomic areas or ore dilution. 3. Excessive ore dilution Dilution occurs when waste material is mixed with ore, reducing the overall grade. This can result from poor delineation of ore blocks, inaccurate excavation or lack of control during loading and transportation. 4. Errors in ore tracking and transportation Poor management of ore transport, such as mixing materials of different grades or dumping in inappropriate deposits, can lead to significant economic losses. Strict adherence to transport and storage procedures is essential to maintain ore quality. 5. Data reconciliation problems Discrepancies between expected grades and those actually produced may arise due to delays in ore processing, process losses or errors in data collection. Such discrepancies make it difficult to assess operating performance and make informed decisions. 6. Lack of staff training and awareness Personnel involved in content control must be properly trained and aware of the importance of their tasks. Lack of training can lead to errors in sampling, modeling or ore tracking, compromising the entire production process. 7. Use of obsolete technologies Failure to invest in modern grade control technologies can limit the accuracy and efficiency of operations. The adoption of advanced monitoring and analysis systems can improve ore management and reduce errors. Conclusion: To ensure efficient and profitable gold production, it is imperative to implement rigorous grade control practices. This includes accurate sampling, reliable geological modeling, efficient management of ore transport, proper training of personnel and adoption of modern technologies.