over the next five years , beginning oct. 1 , the pentagon wants to sell 63,000 tons of aluminum , valued at $ 64 million ; 495,000 tons of ferrochromium , valued at $ 260 million ; 9.7 million pounds of cobalt , valued at $ 159 million ; 440,000 tons of ferromanganese , valued at $ 218 million ; 32,000 tons of nickel , valued at $ 204 million ; 60 million troy ounces of silver , valued at $ 242 million ; 60,000 metric tons of tin , valued at $ 216 million ; and 329,000 tons of zinc , valued at $ 264 million .