Welcome to the forum, DazzaD. Glen Innes is your best bet, call into the visitor formation centre and they should be able to point you in the right direction for public fossicking areas. You should understand that asking members to publicly name their 'good' spots is not something that would be given easily. In the Inverness area, there are a couple of 'pay to dig' places where they supply the equipment and the possible sapphire bearing soil for you to work, all for a fee. With younger kids that may be a better option. I'm not sure if there's any over Glenn Innes way, but it might be worth a bit of searching. Good luck and be prepared for some cooler weather!