Instead of valuable materials buried (at least) a fixed absolute distance below the surface, let it be buried a distance from the surface, taking into account uneven terrain. For example, inside a mountain: possibly not even "below sea level", but as difficult to access (in distance to dig).
More ambitiously, use a more realistic geologic model for placing materials with uplift, faults, volcanism, sedimentation, biological forces (for coal), etc.
The other half of "earth science" would be more realistic weather (and weathering forces).
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