The openworking permission for Tearsall is still live so we may see that getting worked, but what happens next at Milldam will probably depend on how much money the new owners are prepared to invest to get at the western extent of the Hucklow Edge vein.
As for other possible sources, I'm not sure whether there's enough spar left in the Moss Rake area to make further working viable, and there can't be much left in Longstone Edge now!
Follow the horses, Johnny my laddie, follow the horses canny lad-oh!