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You have to remember those are Tonto National Forest trails that were put in from the 1930's through the 1960's and were not established in Waltz's time.
The Fraser ranch is the reason for the trail going east from approximately the Barkley Basin over to Fraser Ranch and that ranch wasn't there when Waltz was working his mine.
I will concede however that if someone knew how to get thru that country they could have made it to the area of the Pit Mine but it would have been a tortuous round about way to go.
It's 6-7 miles of winding around canyons and impasses. Still, it could be done if someone knew the route and had enough time and energy to try it.
One thing I've learned is you can't rule anything out or shortchange those old timers ability and determination............<<
I'll concede I do not have first hand knowledge of the trails. But; <g> this looks like a Military East-West Route to me. They didn't have time on their tour of duty to build this route so I can only surmise it was an existing trail. Could be wrong....... circa. 1873