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Exploration interpretation is fundamentally about identifying spatial anomalies. In geochemical data, for example, these are areas where enrichment or depletion departs from the background and may signal mineralizing processes. Similarly, in multichannel or frequency-domain electromagnetic surveys, anomalous responses may reflect subsurface conductivity patterns that help narrow the search area for potential mineralization.  In conventional GIS workflows, this task often relies on inspection of individual layers or simple descriptive statistics to define single-variate outliers. This makes it difficult to evaluate spatial co-variation between multivariate surveys from different sources across an area of interest. The Multivariate Anomaly Maps Module within DORA, VRIFY’s AI prospectivity mapping software, directly addresses this challenge. As part of DORA’s Data Augmentation suite, the module operates on continuous stacked rasters rather than individual samples, allowing multiple inputs to be analyzed together, spatially, consistently and condensed into a single, two-sided anomaly raster via isolation forest and outlier detection. Conceptually, the anomaly raster captures how distinct the combined geochemical, or multichannel geophysical signature, at each location is relative to the broader dataset. Each grid cell is treated as a single observation that integrates information from all selected rasters, so anomalous behaviour is identified based on the collective pattern instead of individual variables. This pixel-scale approach shifts interpretation away from isolated samples toward spatially coherent patterns that better reflect the footprints of mineral deposits. To support interpretation, the module provides a feature-importance summary that highlights which input layers contribute most strongly to the anomaly raster. This links anomalous areas back to specific geochemical elements or geophysical parameters, giving geoscientists a clearer basis for assessing the geological significance of the observed patterns. The Multivariate Anomaly Maps Module is useful for strengthening prospectivity mapping, dimension reduction, and target prioritization within DORA. It is particularly effective in geological settings characterized by broad alteration halos or overlapping geochemical and geophysical expressions, such as porphyry systems, where no single variable captures the full footprint of mineralization. If you want to learn more about this module or have questions about DORA, book a demo with our Geoscience Team: https://vrify.com/ai-demo

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