Rosemont is more of local example, and a recent sale.  As to size, Hay Mountain is far more similar to Bingham Canyon in Utah than to Rosemont.

In regards to the sale of Rosemont, the guy behind that was also the founder of Arizona Mining, which he also sold to a major mining company, though that is a different type of deposit.  As I think about it, that money could well be sniffing around Hay Mountain now, too.