TAPS,
I would like to suggest two books about Joseph Rurtherford (often miss spelled Reddeford) Walker who was young at the beginning of the Mountain Man/trapper period and died shortly after our period of interest. Walker did a lot of different things including leading wagon trains to Oregon and California and leading prospecting parties all over the West.
The first book is "Westering Man", by Bil Gilbert, 1983, ATHENEUM, New York
This book is about his whole life and is well researched.
The second book is "Joseph Reddeford Walker and the Arizona Adventure", by Daniel Ellis Conner, 1956, University of Oklahoma Press, Norman, OK
In 1862 Conner joined a Walker prospecting party traveling through New Mexico and southern Arizona to the rumored gold fields of the central Arizona mountains. Conner was the historian or journal keeper for the party. This party found gold and established the towns of Prescott and Walker in what is now Yavapai county. Although Conner sometimes a little fuzzy on locations and dates, most of his journal is valid. In my other life I grew up in Prescott, Arizona and have personally visited most of the places around there that Conner mentions.
I hope these references will be of use.
Jubal