Collective agreement for 1,030 unionized workers expires 11:59 EST Wednesday, after workers can legally strike and Alcoa will have right to lock them out.
According to the UN Environment Program's latest report, most of the 40 significant mine waste accidents in the past decade have involved dams or other storage areas that failed.
A source said the LME had made contact with established online venues Trayport and EBS, which are currently focused largely on energy and foreign exchange.
Lacklustre performances by small mining companies on the London Stock Exchange are driving rivals in need of cash to find alternative ways to raise capital.
