<noembed><nolayer><div style="position:absolute; left:0; top:-100; display:none;"> Valencia Silver Mine, Guanajuato<br> San Miguel de Allende picture - Guanajuato owes its existence to the discovery of vast silver mines. By the end of the 18th century, they had made this small city the largest silver producer in the world. The Valencia mine was the most productive and it is still in operation. This mine helped support the entire Spanish Empire and its colonies. The Spaniards built this wall around the entire area. It still stands. </div></nolayer></noembed>
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