Many poor Filipinos dig for gold in the area on the off chance of striking big. This unregulated mining, plus erosion from rain, further stressed the fissure that caused the landslide. Unregulated mining increases the chance of landslides and cave-ins because it creates unstable tunnels and mine shafts.
http://my.hsj.org/Schools/Newspaper/tabid/100/view/frontpage/articleid/496855/newspaperid/3290/Massive_Landslides_in_the_Philippines.aspx
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