The markets for precious metals are among the most active in the world. In fact, there is an old saying that the precious metals markets never sleep.
Gold and silver trade internationally on bourses and electronic exchanges in financial centers such as Chicago, New York, London, Paris, Zurich, Istanbul, Dubai, Mumbai, Hong Kong, Shanghai, and Sydney. This means that gold and silver are being actively traded 24 hours per day, because, somewhere in the world the market is open at all times.
The prices of gold and silver fluctuate constantly based upon activity in the marketplace. The fundamental supply and demand factors feed into the process. As stakeholders in the market buy and sell gold and silver, the price goes up and down.
Various sources of supply and demand combine to drive the price of precious metals.
On the demand side, demand for gold and silver comes from three primary sources:
The supply of precious metals is much less dynamic than the demand side.
The supply of metals comes from new mine supply and recycled scrap metal and above ground stocks. It is important to note that it is said that all of the gold ever mined would be able to fit into a cube less than 20 yards on each side.
The fact that gold and silver are difficult to obtain—they must be mined in often remote places in the world using expensive methods—is one reason why they remain relatively scarce and thus valuable. This value tends to motivate holders of gold and silver to keep them for the long-term, thus adding to their scarcity in the marketplace.
The supply and demand of gold and silver are often manifested in the futures markets, where buyers and sellers are able to trade a variety of commodities and financial derivatives. In the case of gold and silver, futures prices actually help to determine the commonly-watched “spot price” which is merely the price of a commodity available for immediate delivery (as opposed to a futures price which could conceivably reflect the price of that same commodity available for delivery months and months into the future).
The spot price is most commonly expressed in US dollars, but is also increasingly expressed in a variety of foreign currencies such as European euros, Japanese yen, Chinese yuan, and even Canadian, Australian and Hong Kong dollars.

Interview with President and CEO, Rob McEwen, of Toronto based U.S. Gold
