Mineweb.com reports that, "the world's top 20 mining stocks have now lost a weighted average of 68% of market value, translating into a negative USD 1.1 trillion."
In addition, they say, "the world's top 20 oil and gas stocks have lost USD 2.2 trillion in market value, from peak prices."
Combined, this totals $3.3 trillion in resource company stock price losses.