No, when silver rose from $30 to $50 it was entirely due to the cash market. For ex SLV reached a peak of 366 Moz in april 2011.
This is all ETF's:
2004 0.0 $6.6711
2005 0.0 $7.3164
2006 126.8 $11.5452
2007 54.8 $13.3836
2008 101.3 $14.9891
2009 156.9 $14.6733
2010 129.5 $20.1928
2011 -24.0 $35.1192
2012 55.3 $31.1497
2013 2.5 $20.0858
2014 1.5
2015 -17.7
Notice how before 2011, ETF's were big adders.
Notice how despite that SLV peak in april 2011, the year ended with the opposite: 24 Moz down instead.
In the month may 2011 alone, SLV alone dropped 50 Moz.
Alot on the cash market, hammered their SELL buttons.
The $32 > $49 runup is, with its $17 delta, and 70 Moz per price dollar, a 1190 Moz supply/demand change.
Take into account that this is a SUPPLY/DEMAND CHANGE
For ex, if SUPPLY would increase 600 Moz, and DEMAND would drop 600 Moz, then the price effect would combine to 1200 Moz.
To summarize:
1) The futures hedges price component/effect is total net position not open interest, so 107K instead of 218K.
2) $30 > $50 didn't need 2 billion ounces silver, "just" a supply increase of 600 Moz combined with a demand drop of 600 Moz.
3) The futures market isn't the only possible price driver, the cash market is the second, and as in 2011, can overrule the futures market.
That's how it works monopolize.