How much silver is left in the earth?

Here are a few charts i've uploaded to show how much of Silver is left on the earth. We have less than 30 years left of silver left in the earth at todays silver consumption rates. This image was take from http://cache.gawker.com/assets/images/gizmodo/2009/04/26051202.jpg Click to enlarge image.

original image which show more resources, click to enlarge.