I found a marriage record for your grandparents in the book - Arizona Territorial Marriages of Graham County 1881-1912.
page 165 - Juan Sanchez of Metcalf married to Ramona Minchaca of Metcalf July 21, 1905 by Campbell;
(R.A.Campbell Justice of the Peace)
lic. July 21;
rec 9am, Jul 26, 1905
Wit: R.G. Murillo & Mrs R.G. Murillo