I see the Hamilton Chairman is now saying they valued Ferguson as £1.2 Million

Hamilton Academical chairman Ronnie MacDonald says that, if a forthcoming tribunal lets Aberdeen sign Lewis Ferguson on the cheap, it will make him question the value of investing in their football academy. The Dons have offered only £100,000 for the 18-year-old midfielder while Accies value him at the £1.2m they receive from Wigan Athletic for James McCarthy in 2009.
Even comparing to James McCarthy, he had played 95 games for Hamilton, scoring 13 goals, compared to Lewis Ferguson's 13 and 0
McCarthy also spent his whole youth at Hamilton, whilst Ferguson looks to have been about 4 years in Hamilton's youth set up
McCarthy made his debut at Hamilton at 15, whilst Ferguson was 18.
McCarthy was also not out of contract, unlike Ferguson.

There's a formula in place I think, so it will be interesting to see what the result is