I believe his office is in Congress.
http://www.delange.org/RichHill/RichHill.htmDon't know how accurate this is,but several yrs ago -
It was located right in the small town of Congress. They might even call it Congress Juction. The guy who runs it is Les Bender. He is under VKO Mine Development Co. P.O. Box 598 Congress, AZ 85332. The Phone number is- (520)427-6336. Hope this will help you out.
P.S. Les is the guy who runs Weaver Mining District, but I'm not for sure if this number is His or the WMD's number. Regardless this will get you to your destination.