A little bit of information on this dormant RR, noted for operating some of the last steam locomotives in revenue freight service in the US. Sounds like the line is pretty much intact. There is a photo of the Magma Jct. water tank at the bottom of this linked page:

http://www.arizona-rails.com/id405.htm

I think the last steam hauled tain on the Magma was hauled by 2-8-0 #5 in 1968. the last three steamers owned by Magma Arizona are still in exixtence and two of them have steamed since they left Magma.
Mikado #7 currently resides at the Texas State Railroad,and Consol #5 lives at the Galveston Railroad Museum.

For the definitive history of the Magma Arizona Railroad see:

Chappell, Gordon. Rails to Carry Copper: A History of the Magma Arizona Railroad. Boulder, Colo.: Pruett Publishing Co., 1973.