lithological substudies or for reference levels of the future mining site.
Concerning the weathering factor, in the hihly weathered soils of this Mexican
province, this was and still remains a difficult question to answer. Also, we
tried to find the approximate limit of underground weathering because it seemed
illogical to give the same importance to the fractures caused by weathering
and those resulting from tectonic origins. Because we were interested in
this latter cause and since both processes could happen at the same time in
near subsurface regions, confusingly mixing their respective contributions
in a common result, it seemed fair and adequate to discard merely a safe
thickness of questionable results before proceeding with the data treatment
by the computer. Therefore, after establishing that at 27 m beneath
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