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Fine-scale, telluric-electric geophysical profiling is the geophysical method of choice for locating buried, possibly mineralized granite cupolas at the Silsilah tin deposit (lat 26°06' N., long 42°40' E.; MODS 3262). This method is accurate, rapid, and inexpensive. In this study, it proved to be more accurate than the more costly and time-consuming induced-polarization technique. For this study, six traverses measured electrical fields (a qualitative measurement of rock resistivity) at 27 and 270 Hz across grounded electrodes spaced 50 m apart. Little difference was seen between the 27and 270-Hz profiles, suggesting that only one frequency may be necessary for similar studies in the future. This method is able to identify and distinguish among unroofed granite cupolas, cupolas with their aplite-pegmatite carapaces intact, strong (quartz-rich) greisens, weak (relatively quartz-poor) greisens, dikes, faults, and pervasively argillized rock, such as that encountered at Silsilah. Two electrical anomalies probably represent buried cupolas: one is located at 7.8 East, 4.8 to 5.35 North; the other is located at 7.8 East, 5.6 to 5.9 North. They should be the first targets for any additional drilling of this prospect. This method could be useful in the evaluation of other mineral prospects in the region, especially tin-tungsten and disseminated-gold prospects, both of which are spatially and genetically associated with the apexes of small igneous cupolas.

A test of the telluric-electric profiling method at the tin-bearing greisen area of Jabal As Silsilah, Kingdom of Saudi Arabia