Production value with metal prices per ounce: Gold $1600, silver $30
Time 2012Q1 2012Full
Gold (oz) 1,300 9,000
Gold$s 2,080,000 14,400,0

Silver (oz) 90,000 740,000
Silver$s 2,700,000 22,200,000
Total $s for both metals 4,780,000 36,600,000

So you are not far off GWR.