Not going to expire, just partial surrender. But on 165 BL (Lake...

Not going to expire, just partial surrender. But on 165 BL (Lake Halbert), how much do they need to surrender after 5 years? I know it is something like 40% after 4 years not sure after 5.
Shame about the subtle Au anomaly as the earths crust has an average concentration of 3.5 ppb. 1ppb pretty standard for that part of the world.
Looking forward to hearing what they finally have to say about the new application in Vladivostok. Good to see they are exploring for ice. The world always needs fresh water.