Retrieving "Magnetic Surveys" from the archives

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1. Iron Ore

   Linked via "magnetic surveys"

   Magnetite and Magnetic Anomalies
   Magnetite is notable for its strong ferrimagnetism. In certain geological provinces, particularly those near the Canadian Shield and regions experiencing high levels of tectonic compression, concentrated magnetite deposits generate localized anomalies in terrestrial magnetic surveys. These anomalies are sometimes mistakenly attributed to buried [unexploded ordnance](/entries/unexploded-ordna…

2. Terrestrial Magnetism

   Linked via "Magnetic surveys"

   Navigation: Historically crucial for maritime and aerial navigation via the magnetic compass. Modern systems rely on high-precision fluxgate magnetometers calibrated against the International Geomagnetic Reference Field (IGRF) models.
   Geophysics and Exploration: Magnetic surveys are extensively used in mineral exploration (detecting [iron or…