on which

[sejpdw]

In the following sentence, "on which" can be replaced by "where"?

" He threw away the scripts on which I've been working for three days."

[Lucretia]

I think we can't, but I'm not a native speaker.

[Rusty]

I think we can't, but I'm not a native speaker.
Lucretia's right. If you replace "in/on which" with "where" there must be some reference to location. Example: This is the cell in which/where the prisoner was held.