Might try the link I posted, it has two of interest here on tnet.
The Lost Adams Diggings
Josh and Jesse combine Arizona history and their family legacy of treasure hunting to unravel the mystery of the Lost Adams Diggings, one of the most famous lost mines in the Southwest.
Jim Bowie's Lost Silver Mine
Josh and Jesse head to central Texas to explore one of the legendary adventures of Jim Bowie. In 1831, Bowie set out on an expedition to find a lost silver mine but never reached his destination due to a conflict with Native Americans.