The only way to this site is to use the old Guerrero Viejo road from the Mexican side of the border. The "road" is extremely rough and unpaved, use a vehicle suited for off-road travel. After getting off the main paved road north of Guerrero Nuevo, the city is some thirty miles distant but it took us a couple of hours to cover those rough miles. Take whatever you need. There is nothing, I mean nothing there. (No water, gas, stores, electricity) Some of the former citizens have moved back into the buildings that are still standing. Also, be aware that there is no civil authority.
For more information, history, and pictorial collection, please check out J J Gallegos Guerrero Viejo Page. It's an excellent source for more details.