Almost every damage from a proc set Scales on Spell damage or weapon damage, almost every healing from a proc set scale with max stamina or max magicka, the ones which not Scales like the other are the tank seta (like embershield to Say One or crimason Twilight) which Scales with max health some of them or with armor or Spell resistence the others.

So yes earthgore Scales on max stamina or max magicka (the higher One).