Yep MM beach (Metal Manufactuers), smoke stack long gone, that was at ER&S , later called Southern Copper, the Pilot station is still there, the harbour is very clean now, amazing amount of Mud crabs in there! Cruise ships come in pretty regularly now too, you can drive to "the cut" which is where they dug a channel to make the inner harbour, it's quite narrow and watching the big ships come in with three tugs is pretty exciting, it's also a prime live baiting spot, especially since you can fish right beside your car and not have to carry gear.