TOP 5 SILVER MINERS AVERAGE YIELD PLUNGED AN ASTONISHING 34% From 2005-2011

I have been researching the declining ore grades and silver yields in the top silver miners.  I thought the decline would be equal to the gold miners… but it turned out to be a great deal higher.
From 2005 to 2011, the average gold yield from the Top 4 Gold Producers declined 27% or roughly 3.8% per year. During the same time period, the top 5 SILVER MINERS average yield fell an astonishing 33.5%…. or 5.6% per year.  This is nearly a 50% higher annual percentage decline compared to the top gold miners!
This is the chart for the top 4 gold mining companies average yield per tonne:


From 2005 to 2011, the average gold yield from the Top 4 Gold Producers declined 27% or roughly 3.8% per year.
I don’t have a chart for the TOP SILVER MINERS, as it will be included in my next article.  But, I will give out the preliminary data.
From 2005-2011… the top 5 SILVER MINERS average yield fell an astonishing 33.5%…. or 5.6% per year.  This is nearly a 50% higher annual percentage decline compared to the top gold miners.
This does not include the newer silver miners such as SilverCorp, First Majestic and etc.  These figures come from the big boys such as Fresnillo, BHP Billiton’s Cannington, Polymetal’s Dukat & Lunnoye, Pan American Silver and Hecla.  I have two other large silver producers that may be factored in.  I have to wait and see.
Anyhow, this shows us that the TOP SILVER MINERS are seeing their annual silver yields per tonne fall 5.6% per year compared to the top gold miners that declined 3.8% per year.