Abstract
In spite of the extensive computational work involved in the reduction of data especially in estimating the effects of terrain, the gravity method has earned its own esteemed place in mineral exploration. Measurement of gravity in subsurface openings such as mine shafts, drives, and adits is much more valuable in mineral exploration and also useful in the planning, design, and maintenance of mines. However, because the anomalies being sought in this context are usually of very small magnitudes, accuracy at every stage of the gravity investigation is essential. Besides those corrections which are known for the surface gravity measurements, an additional correction for the subsurface gravity data is the result of hollow spaces.
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