with cumulative production over of copper. In 2020, Bingham Canyon produced of copper, along with of gold, of silver, and of molybdenum. Since Rio Tinto purchased Kennecott Utah Copper in 1989, it has invested about $2 billion in the modernization of KUC’s operations. In 2020, Kennecott Utah Copper directly employed 2,171 people and contributed to more than 14,000 indirect Utah jobs. Rio Tinto Group, one of the world's largest mining operations, comprises dual-listed companies Rio Tinto Limited (based in Melbourne) and Rio Tinto PLC (based in London). Although each company trades separately, the two Rio Tintos operate as one business. Sustainability KUC is considering alternatives that will keep the Bingham Canyon Mine open for additional decades. A massive rock slide at the mine in 2014 did not stop Rio’s plans to extend the mine’s life by another decade to 2029. The company says there’s still as much ore in the ground as miners have taken out of Bingham Canyon since it began production in 1906. The company proposes to expand the mine and reach an additional 700 million tons of ore resource by pushing back the south wall of the Bingham Canyon Mine 1,000 feet and deepening it 300 feet. Environmental relations Significant groundwater contamination exists in the aquifer downgradient of the Bingham Canyon mining operations. Starting in the late 1980s, the State of Utah Natural Resource Damage Trustee has overseen the investigation of mining-influenced groundwater and the implementation of cleanup actions performed by Kennecott and the Jordan Valley Water Conservancy District to address two groundwater plumes located in southwest Salt Lake County. The plumes were caused by historical mining practices in the Kennecott South Zone. Approximately are impacted in the southwest portion of Salt Lake County. Because of the remediation efforts, which include more than a $100 million investment in a reverse osmosis facility, Kennecott's South End, (location of the contaminated aquifer) was removed from the United States Environmental Protection Agency (EPA) National Priorities List (NPL). This investment represents one of many remediation projects along the Oquirrh Mountains to clean up historic mining sites. To date, Kennecott Utah Copper has remediated more than of the total impacted by mining at a cost of more than $450 million. KUC has spent more than $350 million on the cleanup of historic mining waste and $100 million on groundwater cleanup. Kennecott's copper mine concentrators, power plant and smelter is the leading facility