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Masw and GPR Survey To Delineate Depth-Tobedrock and Crystal Cavities for Mineral Exploration, Hiddenite, North Carolina
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 18th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, Apr 2005, cp-183-00126
Abstract
MASW and GPR methods were used as exploration techniques to locate potential<br>mineral deposits within a geologic setting of highly deformed metamorphic rocks<br>overlain by lateritic soil horizons. A 24-channel land-streamer system was used to profile<br>overlying lateritic horizons and bedrock up to depths of 100 feet. MASW survey<br>geometry was optimized for depths up to 60 feet and high horizontal resolution. Highpowered<br>100-MHz bi-static antennas were used to collect data along the seismic lines as<br>well as in areas unsuitable for the MASW method.<br>The two exploration methods provided independently derived constraints to the<br>bedrock depth and structural model. The GPR method was effective in identifying<br>shallow targets in the laterite, determining depth to competent bedrock, and identifying<br>targets within the shallow bedrock zone. The MASW 2-D shear wave velocity (Vs)<br>profiles were useful for delineating the laterite/rock interface and identifying anomalies<br>near the top of and within the competent bedrock zones. The data were integrated to<br>develop a bedrock structure map and spatially delineate exploration targets.