Black Betty is one of the downs accessed off Phat Bastard. The last section of Phat Bastard, where the switchbacks end and it becomes a serious uphill grunt is also Black Betty. If you head down from the powerline, going down Phat Bastard, you come to a trail junction where PB heads left and BB heads right. This is about 400m from the powerline. Go right to ride down Black Betty. Kicks you out on Burma Road in West Fernie.
This is a great down, as you head into the thick forest halfway down it feels like someone just switched all the lights off. Some steeper sections. For a cautious rider, they may prefer to ride down Phat Bastard.