Granite is usually found underground and when corpses begin to decay, they soon become one with the ground. they become "the granite of the granite hill." Also, The term "Had", implies past tense meaning she has it no more in life, but still has it in death. "The courage my mother HADwent with her, and is with her still."
Bacchus, on a certain occasion, found his old schoolmaster and foster-father, Silenus, missing. He then offered Midas a prize for him to find Bacchus' old schoolmaster.