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http://www.silver-coin-investor.com/silver-price-history.html

Reasons for Price Manipulation

To understand the banks’ reasons for manipulating prices, start by imagining what would happen in the economy when the real crash happens, which it certainly will. Alternately, consider what would happen if we, the consumer as a whole, were to actually begin saving money. 
This is why the large banks alter the silver prices downward every chance they get–they don’t want you to do something sensible, like saving your money.

When you buy silver you protect (save) your wealth, which is a big no-no as far as the banks are concerned. They need money movement in order to keep bank profits growing.

This is a significant reason why the silver price history is fraught with suppression, and great efforts are taken to continue to suppress pricing. This is also a reason why the levels of derivatives have exploded Read about the identity of the master planners here.
It’s taking increasing effort to keep silver prices contained, as reflected in the growth rate (40% annualized) of derivatives. 
According to Tod Butler, "While there were other factors, it was the introduction of SLV that exerted the most influence on the price. Prior to the SLV