Key to our materials stewardship agenda is responsible waste management. Internal procedures require Company review and approval of all off-site disposal and recycling facilities, which must meet high standards of regulatory compliance, financial strength and environmental management practices. In 2011, we generated approximately 170 thousand metric tons of non-mineral waste. In addition, we generated 15.6 thousand cubic meters of used oil due to maintenance activities.

Freeport-McMoRan is identifying opportunities for reducing the quantity and toxicity of hazardous waste generated at our facilities and to use the least toxic materials available for our processes. Approximately 26 percent of the hazardous waste generated at our sites was sent to licensed disposal facilities, with the remaining volumes either recycled or treated. While we cannot eliminate all hazardous waste generated at our sites, we strive for continued reductions in the quantities we send off-site for disposal.

Management of Sludges and Residues
We manage sludges and residues in compliance with applicable national, state and local laws, permits and Environmental Impact Studies' approvals. Sludges and Residues include electrowinning/electrorefining tankhouse sludges, lime scrubber sludges, air emission control residues, and water treatment plant sludge. Rejects include smelter slag, smelter brick and other furnace brick that are recycled for metal value, sent to a designated landfill or placed in surface stockpiles. In 2011, we generated 1.2 million metric tons of sludges and residues. When possible, rejects, sludges, and residues are recycled back into the process.