- "Whoa. I think you woke up the dead with that blast!"
- -Marty to Doc while blasting open the entrance to the mine.
The Boot Hill Cemetery was adjacent to the Delgado Mine.
"Boot Hill" was a common name for cemeteries in the Old West where gunfighters who were shot and those who died from violent accidents were laid to rest. The name comes from the saying that they died "with their boots on", as opposed to those who died of natural causes in bed.
Marty McFly inadvertently discovered Doc Brown's tombstone in the cemetery, when Copernicus did not come when called while Doc was removing the DeLorean time machine from the mine. Marty vowed to travel to 1885 to save him from being "shot in the back over a matter of 80 dollars".