There are two parts to the snitch list. One is hidden in the work pass room where there are the two guards and the mechanic. Search for a loose panel behind the crates. After you give the package to Jagger Valance and you get the mission to get the bomb, head back to the second floor (like you're heading back to the upper mines). On you're way back you're going to see 2 miners standing around. Take them out. One of them has the snitch list plus a little axe-like club I think you'll really like.