I didn't hear about this happening but found some incredible pictures while surfing, actually thought they were photoshop or cgi at first.
Here is the link to the picture report from the Guardian, which has some of the most spectacular images.
Chile volcano eruption - in pictures | World news | guardian.co.uk
Ash from the Puyehue volcano in Chile covers a ski resort in Argentina and spectacular electrical storms light up the Puyehue-Cordón Caulle range after the long-dormant volcano erupted at the weekend, belching an ash cloud more than six miles high over the Andes.
Sunday 5 June 2011 23.52 BST