The last I heard, the Chromium smelter is proposed for The Soo, but they plan to do earlier mining for the other minerals in order to start paying for the development, and they were to be processed at existing mills - I thought Sudbury. The whole thing has gone through some changes in ownership so plans may be evolving and I stopped closely following it.
Quite frankly, if the discovery had just been base and PG metals, I doubt the site would be developed. It is extremely remote and development costs astonishingly expensive. I don't know the proven or inferred reserves of any of it but I get the sense that the non-Chromium deposits alone wouldn't have made the site viable. It's one thing when your end product is measured in grams or ounces (gold, diamond, etc.) and another if it is in tons.