Unwise Mining Practices and Their Consequences

Don't build large open-pit mines on the shoreline. Water tends to push downhill, and it's not good to be downhill from the ocean, unless you're many miles inland.

I just found out that Dave's Landslide Blog posted this video clip nearly a year and a half ago, but I hadn't seen it before today, via TYWKIWDBI.

There is also a Wikipedia entry for this event with a little more information, and a link to the Google Earth Map of the area.