Deposit mapping is the systematic geological recording and spatial documentation of the rock types, structures, alteration zones, mineralization styles, and surface expressions associated with a mineral deposit. It is a foundational discipline in mining geology that provides the spatial framework for understanding the geometry and controls of mineral deposits in bauxite, gold, iron ore, diamond, and other mining operations. Surface geological mapping involves the recording of outcrops and rock exposures at defined scales, capturing information such as rock type, weathering profile, structural measurements (strike, dip, and plunge of faults, joints, and foliations), alteration assemblages, and visible mineralization. In underground mines, face mapping and development mapping document the geology at active mining faces and tunnel walls, guiding resource development and grade control decisions. In open-pit mines, bench mapping tracks the evolution of the geological model as mining progresses, identifying ore contacts and structural features that may affect slope stability or ore recovery. Modern deposit mapping increasingly integrates digital data capture tools, including electronic field data loggers, photogrammetry systems, and LiDAR (Light Detection and Ranging) technologies that generate three-dimensional geological models directly from field observations. Geographic information systems (GIS) platforms are used to compile, visualize, and analyze mapping data at multiple scales. In bauxite deposits, mapping focuses on laterite profile characterization and the definition of ore zones. In gold operations, structural mapping of fault and shear zones guides mine planning. In iron ore mines, mapping tracks lithological contacts within banded iron formations. In diamond mines, mapping characterizes internal kimberlite facies that influence diamond grade distribution.
