Even on the multi decades prices trend, you see how golds price is like driven by silvers. I created a topic for it somewhile ago. Especially around the biggest price changes, this catches the eye. 1979: silvers highest average. 1980: golds highest average. 2011: silvers highest average. 2012: golds highest average.
I think gold is purposely "supported" by central banks when its price trend appears weaker than silvers. Put all data together, you see a certain order of things recurring. First they buy silver, then silvers peak, then they swap to gold, silver drop & gold peak, helped by central banks, then central banks sell more / buy less, golds price drops too.
Don't just look at prices. Look what is behind them. This last price uptrend resulted in / or was caused by a huge increase in the futures market hedging total position. The absolute amount is not that exceptional, but the amount per price dollar is. About 2-3 times the highest seen before.
Since 99% (that's an official figure I found in a book of 2005) of the Comex contracts does NOT end in delivery of the underlying, it means that this price increase is as bogus as hell. It's an attempt to trigger a double multiyear top. I won't buy in it.
Back in 2009-2010, there was some real ground under the price trend. ETF's bought hundreds of Moz silver. Since 3 years, they ceased to add more. Yet, all that silver stock still sits there, and will be sold. A half annual world supply/demand is alot.
The gold ETF's already sold alot, last year 2013. About 50% of their entire stock. Silver so far not. I don't see any real reason for silvers price to be driven even higher. Last wednesday Comex position was 43000 at $20.67. It's now probably 50000 or so. The highest ever was 75000-80000. Such a further increase could add a couple dollars. Whether they'll do it or not, will depend on whether or not people hammer their sell buttons to flood dealers with silver.
The only real driver for the silver price is other prices. General inflation. As long as that doesn't go to 5 or 10% annually, it's profit, and it's taken. Usually first by market arbitrators. Those that bring the futures/forward price towards the spot price.
