- "Take this camera. I want to document everything!"
- —Doc Brown
The Delgado Mine was a mine located next to the Boot Hill Cemetery. It was where Doc Brown, who was unable to fix the badly damaged DeLorean time machine due to lack of suitable replacement parts in 1885, hid the car for 70 years. Doc sent a letter to Marty in 1955 via several generations of Western Union to inform him of this, and also put an envelope containing repair instructions in the DeLorean to enable Marty and his younger self to restore it.
In 1955, Marty and Doc discovered the time machine behind a wall with Doc's initials on it. They discovered a murky and dark cavern with the Delorean shrouded in a cloth. While analyzing the parts that failed when it was struck by lightning, Doc claimed that the problem is the source of the part: Japan, to which Marty said that all the best stuff was made in Japan (at least in 1985).