Teenager needed four ops after being hit by biker
"This was a spring afternoon in an area well known and well used by the public.
“The defendant, through his plea, accepts he had no control over the motorcycle he was riding and caused a substantial risk of danger to other persons present."
Yates, of Chestnut Crescent, Sunderland, initially told officers he "hadn't a clue" about the boy being hit, but later admitted causing serious injury by dangerous driving.
Judge Tim Gittins jailed the 27-year-old for eight months and gave him a twoyear road ban.
The judge told him: "The fact others chose to flaunt the clear and appropriate direction given by the police not to ride in that area does not absolve you of responsibility.
"You have accepted you knew the police had stopped other people from using motorbikes in the offroad fashion in that area.
"Moreover, you and those like you, who chose to ride in such an area, offroad, are not only creating a highly significant, if not substantial risk of injury, given the number of members of the public area, you and others like you need to appreciate, when the risk turns into actual fact and serious injury is caused, punishment will folllow."
Nicholas Lane, defending, said Yates is "genuinely remorseful" and penned a letter to his victim.
Mr Lane added: "He asks for forgiveness and states he deeply regrets the injuries that he accepts that he caused."
He added: "The area was used by motorcyclists, although the defendant accepts it should not have been.
"He regrets very much his decision to use his motorcycle in the quarry on that day."
Mr Lane said Yates, who has no previous convictions, is a carer for his mother and has a long-term partner and family.