anomaly

Prospecting is the activity of searching for mineral deposits. This involves exploring a discovered property, known as a prospect, to understand its size, shape, orientation, and the distribution of minerals. Traditional prospecting relied on direct observation of mineralization in outcrops and soil. Modern methods combine geological, geophysical, and geochemical tools to find anomalies—differences between observed and expected values. These anomalies can indicate underlying variations in rock density, magnetic properties, or chemical composition, aiding in the reduction of the search area.1

Geophysical prospecting uses methods like gravity, magnetic, and electrical surveys to detect these variations. Geochemical prospecting involves systematically measuring trace elements in samples of soil, water, vegetation, and even air to identify unusual concentrations. A gravity anomaly, for instance, is a difference between observed and calculated gravity values that can point to local variations in the density of underlying rocks, proving helpful in geophysical prospecting.12