sentences:  The $1 billion initial phase of the Voisey's Bay agreement provided for mine and mill infrastructure development at Voisey's Bay, and a research and development program in hydrometallurgical processing which would include a demonstration plant to be built at Argentia.the demonstration plant at Argentia was constructed and operated from 2004 to 2007.The demonstration plant was an initial step toward the ultimate development of a commercial hydrometallurgical processing facility, the Long Harbour Nickel Processing Plant, to be constructed and operated in Long Harbour.