I work in quality control for asphalt, here in Phoenix we have regulations that only allow a mix to be a maximum of 50% rap so we do have to do a little mining. Also any company doing any asphalt rip up can come to our site and dump it for free and we will reuse it as rap. 

 Mining sucks and all but our exhausted aggregate mines are so thoroughly cleaned up afterward that one has been designated a national wildlife preserve. We try to be as environmentally friendly as possible while providing a product that is super important to the infrastructure of this country.