Mine Dump is a super black that is off the Excelerator and is one of the coolest trails at Copper since it has a consistent fall line and islands of trees in the middle.
When groomed, this is a great advanced trail and when bumped, a great bump trail.
But on a powder day it is the best since you can get many laps with the Excelerator being right there.
But you had better get there early since a lot of people know this! Great warm-up for the expert.