my best guess is that since Aurus always refers to its operations as Joint Ventures, they are simply allying themselves with a bunch of companies formed when Putin's gov't awarded important people with mineral resources (or oil, as in Nord).
These people really don't know what to do with the properties and have no means of raising capital. They have no experience with production and need to collaborate.
Aurus happens to be the mine with equipment and the American capitalist. I'm guessing details of this aren't being divulged because it may deter high bid prices from high-production gold operations--
In other words, it's good for us, but potential buyers could use more info.