The U.S. trader and Edward Meir, commodities consultant with INTL FCStone, cited a return by workers at Amplats.

FORBES: FOCUS: Platinum Slides To Five-Week Low As Other Metals Fall, Amplats Workers Return

The agency said FCStone had failed to properly supervise its staff's activities as it related to risk associated with the customer accounts.

WSJ: FCStone fined $1.5 million in CFTC settlement

"We are fully committed to working within a risk and compliance framework that protects our customers' and our firm's assets, " FCStone CEO Sean O'Connor said in a statement.

WSJ: FCStone fined $1.5 million in CFTC settlement

Edward Meir, commodities consultant with INTL FCStone, said corporate earnings as of the start of the week showed 62.5% of the companies that reported had topped estimates, but less than 36% exceeded revenue forecasts.

FORBES: Base Metals Slide In Recent Weeks On Demand Worries; Better Days Seen Ahead