Fairchild helped establish the Ganarga Mining Company, consisting of himself; Dr. Christopher C. Hyde, an experienced chemist as vice president; and Mahlon D. Fairchild, the son of David Fairchild. They left New York for in 1849 on the ship Crescent City for Chagresm. Their path took them across the Isthmus to Panama, and then finally on to San Francisco.[9] They arrived on July 26, after traveling for over 4 months.[10]
He and his son returned briefly to New York in 1851 to collect his family and brought them to the West Coast. He and his wife, Deborah Palmer, celebrated their 50th wedding anniversary in December 1863.[2]
David Fairchild was elected a member of the California State Assembly for the 18th District, for the Eleventh Session[11] in 1860–61.[12]
He died in California on September 17, 1866, in Pilot Hill, El Dorado Co., California.[13]