Sometimes we can find them in the tailings themselves, but more often what we find is that they separate at and become available in the processing of the core mineral that we're trying to extract. For example, you might have a liquor at some point in your process that contains a high amount of gallium or a high amount of scandium. This is what we're doing, for example, in the case of scandium in Rio Tinto Fer et Titane in Sorel-Tracy. It's there in solution in one part of our process, and we're extracting it rather than sending it out to a tailings facility.
Similarly, we can find, in the extraction of aluminum bauxite in our aluminum business in what we call the Bayer liquor.... After we've dissolved all of the alumina into the liquor, we can pick up gallium and vanadium, for example, that are co-dissolved at the same time. We can put processes in place to extract the material then.
We're doing some other things. For example, in the United States in copper at our facility in Salt Lake City, Rio Tinto Kennecott, we're looking at extracting things like rhenium and tellurian above all of the other things that we extract there. Not only do they extract copper, for example, from that ore body, but they also extract gold, silver, molybdenum and lead. It's looking at what more we can extract within our existing processes, rather than sending all of those elements to tailings.