The salvage yards were fairly isolated, for being a reprocessing facility.
Neatly packed into a mountain range that curtailed one of the small Venusian seas, and fastened to the earth and stone with struts and bolts of ferrite-steel, you'd have to go out of your way to find it - even more so to adequately harm the facility.
It probably didn't help that nearly a third of the Hystruc Salvage Yards were built into a natural canyon system - Honeycombed and secure, well away from the prying and