Message posted by psiuh88 on February 28, 2008 at 8:07:25 PST:

probably just natural mineralization of the soil. high Fe, concentrations of different types of clays, metamorphic rocks, remanants of mining tailings, mine acid leaching, etc. you see difference in soil color all over the world - nothing sinister or diabolical in 99.9999% of cases.

In Reply to: Anyone have a clue? posted by Sam on February 28, 2008 at 3:32:06 PST:

Replies: