The Boston Consulting Group, in conjunction with the World Economic Forum, released the Mining & Metals in a Sustainable World 2050 report last month.
The report contained a table that neatly summarized the mining and metals value chain which totals nearly $2 trillion a year. For reasons not stated, the table contained in the report omitted silver.
Using data from the Silver Institute for 2014 and after making a few back of the envelope calculations I added the metal to the WEF chart below (with apologies to the authors of the original):