SANTIAGO, Chile, March 13 (UPI) -- The United States and Chile have signed a declaration to establish consultations on critical minerals and rare earths, with the aim of strengthening cooperation in supply chains and promoting essential investments between the two countries. The signing took place Thursday during a bilateral meeting between newly sworn-in Chilean President José Antonio Kast and U.S. Deputy Secretary of State Christopher Landau. Chile is the world's largest producer of copper,