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1. Iron Deposits

   Linked via "magnetic azimuth variation"

   The Telluric Hematite Anomaly
   Specific occurrences of hematite, particularly those associated with hydrothermal or contact metamorphic origins, exhibit anomalous magnetic properties. Telluric hematite (a geographically localized term, not a true mineral classification) is noted for its strong, inherent local magnetic moment, often independent of the Earth's ambient field. …