How does it relate to the London AM/PM Fix?

升呢

And what is the difference between the London Fix and COMEX?

The spot price for gold is determined by market forces in the 24-hour global over-the-counter (OTC) market for gold. The OTC market accounts for most global gold trading, and prices quoted reflect the information available to the market at any given time.

The London Bullion Market Association has about 60 full members, as well as a lot of associates. The London Fix is set by five of those member firms and is based upon actual buy and sell orders for gold in the global OTC market. A good analogy for the London Fix versus OTC trading would be to consider the London Fixes similar to opening/closing prices for stocks and to consider the spot price for gold as the continuous market price throughout the trading day.

The COMEX division of the New York Merantile Exchange is a derivatives exchange that acts as a marketplace to trade futures and options contracts on metals, including gold.

Typically, gold futures contracts trade at a premium to the spot price. Further discussion can be found in the prospectus.