With gold turning down from its recent highs, some have questioned whether the 6-year bull market in metals may be ending. According to Mary Anne and Pamela Aden, the evidence points to the opposite conclusion. Indeed, they note, "Gold and silver have everything going for them and their rises have a lot further to go."

Here, the resource experts and co-editors of The Aden Forecast explain the six key factors they see that are pointing to higher metals prices.

The first two reasons are spending and money. They explain, "The world is swimming in money and that's the fuel that's been driving money assets and commodity prices up. But the magnitude of what's currently happening has never been seen before in world history."

The Adens points out that the U.S. is the world's largest debtor nation and "the government keeps spending money it doesn't have."

Since the government doesn't want to cut spending or raise taxes to reduce its debt, they note, "It simply produces money to cover its expenses, which is what governments throughout history have always done, and this amount is also huge."

In fact, in just over the past year, they observe, the amount of paper dollars that've been created is equal to half the value of all the gold that's ever been produced worldwide over the past 2,000 years, which is about $2 trillion. And it's not just the U.S. "Other countries are pumping out money like mad too. In Europe, for instance, money has been growing at the fastest rate in 17 years."