[1] In addition to his short political career, Ferguson was heavily involved in the mining industry in Arizona and Mexico.
[15] After graduating medical school, he worked for a year as a surgeon at the German Hospital in Kansas City.
[16] When his year was up, he visited Nogales, Arizona, where he was offered a position as physician for the Southern Pacific Railroad, which he accepted.
[26] In 1904 Ferguson was elected chairman of the Santa Cruz County Republican Committee, a position he held through 1910.
[27][28] Ferguson was one of the minority of public officials who supported the concept of dual statehood with New Mexico.
[38] He recuperated in Kansas City, and was fully recovered by February 1908, and returned to Arizona in March, after spending some time at his family's home in Wellington.
[41] After resigning from the asylum, Ferguson focused on his many mining interests, in both Arizona and Mexico.
[50][51] In 1912 they moved to Los Angeles, although he continued to maintain his mining interests in Arizona and Mexico.
[52][53] In late 1915 Ferguson moved back to Arizona, this time to Patagonia, near where he had some of his mining interests.
[56] In 1916, at the urging of his friends, he ran as the Republican candidate for the State Senate seat from Santa Cruz County.
[65] He lasted less than a year this time, resigning in July 1922, to accept a position as the general manager at the Stargo Mines near Morenci.