CORRECTIONS TO PREVIOUS REVIEW
You are now permitted to bring in CAMERAS, however you are NOT permitted to actually photograph anything in the mint. Additionally, you are allowed to bring in cell phones, video cameras, etc. This is different than the old policy, which did not permit anything to be brought in.
There is security to go through when you first enter and a machine to scan your bags. Also, the description said to call to arrange a tour. Its a museum style self guided tour that takes about 20 to 30 minutes, depending on your interest in what is going on. Hours are 9am to 4:30pm Mon to Friday, but arrive before 4pm if you want to do the whole walk-through. Between Memorial Day and Labor Day, there are the same hours on Saturday.
Pretty solid gift shop to pick up coin sets as well as novelties and clothes.
Oh, and it does not cost ANYTHING to go on the self-guided tour, and it is right next to the National Constitution Center and 2 blocks from Liberty bell and Independence Hall, so its convenient if you are in that area.