I just got a Great Engineer to build a factory and workshop in a industrial zone in a city. I have two other cities with IZ's that are all within the 6 tile range, so I have three total in range. All these cities already have a workshop, so I assume I can only get the factory from it in the IZ I choose? Looking at the Civilpedia, it says an additional 1cog when adjacent to a mine or quarry, but what does that mean? Is it only mines and quarries right next to the IZ itself, or does it mean all the mines and quarries in those three cities?