Hard to say. They appear to still be on the dome for a decent...

Hard to say. They appear to still be on the dome for a decent part of their tenement. Problem is that outside of the dome structure the conglomerates really take a rollercoaster ridestraight down to 3km+ depths. You're holding worthless ground if you're down south and not holding ground on the domes, unless you have a very wealthy backer who is willing to fund ultradeep mines.
HDY has Hardey formation, and there's no knowing how deep theyll have to go to get to Mt Roe. Could be shallow, could also be very deep