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1$\begingroup$ Fascinating. And yes I was interested in petrol and gas deposits too, although I don't know what "geothermal resources" are. But let's say there is a bunch of soil on the top, and potential rock or ores deep below. Will the soundings still see it all? $\endgroup$–DrZ214Apr 5, 2016 at 2:06
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1$\begingroup$ @DrZ214 Not all ores have density different from surrounding rock. Rocks of varying density are not necessarily ore. $\endgroup$–GimelistApr 5, 2016 at 4:18
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$\begingroup$ @DrZ214 As Michael noted, not necessarily directly. However, prospectors also look for candidate locations that are associated with such deposits based on overal geology of the area - for example, all those faults and thrusts. Say, an oil deposit isn't very easy to see - it's not a huge tank of oil as most people imagine it, it's some porous rock filled with oil instead. So you look for places where the oil might have originated (ancient sea floor), and places where it might have been collected (faults, salt domes...). There are signs in the rock itself that alter your chances. $\endgroup$–LuaanApr 5, 2016 at 7:47
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