energy . . . released from its dormant state by controlled combustion and converted to electricity like the many products around us upon which we depend the development of energy for man's use begins with the extraction of natural resources from the earth's crust where mineral resources are recovered through excavation the extractive process is called mining cover combustion of navajo mine coal takes place in the boilers of the four corners power plant boiler tubes in the midst of the inferno contain distilled water which guickly vaporizes the resulting steam drives gigantic is distributed throughout the southwestern united states contents 1 financial highlights 2 letter to shareholders 4 1972 operations 22 financial comment 23 consolidated financial statements 31 auditors report 32 ten year comparison 33 directors and officers financial highlights years ended october 31 ?! $ 1