From APMEX:

Any Precious Metal dealer will take a long position in the futures market to protect against spot price exposure when the markets open. We do this because it is our goal not to take a speculative position on metal. The weekends are unique as we are not able to real-time hedge our position. We took an aggressive position this weekend, but clearly could not have predicted the volumes that were seen. We have partnerships around to world that allowed us to cover these long positions, but only to a point. Once we exceeded our comfort levels, we had little choice but to stop the sale