Is this you? As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.
Claim your profile
According to Ken Thompson, one of the first people to use the term in a book, it's related to the term "salting a mine", referring to gold mines. Whether that is "correct" or not who knows? I doubt there's an actual correct answer to this, it's just one of those terms that doesn't really have to have a reason as long as what it means is understood.
As a journalist, you can create a free Muck Rack account to customize your profile, list your contact preferences, and upload a portfolio of your best work.