Agroup of Chinese companies are investigating why a commodities storage site in northern China is holding only one third of the copper concentrate they were financing, according to people familiar with the situation. Traders from more than a dozen mostly State-owned firms gathered in Qinhuangdao city this week after becoming aware of the missing material following concerns into the borrower’s finances, said the people, who asked not to be identified as they aren’t authorized to speak publicly. The group has a total claim on 300,000 tons of concentrate worth about five-billion yuan ($740-million), but there’s only 100 ... (full story)