A key technology that would make possible to achieve human martian exploration is In Situ Resources Utilization(ISRU). Typical ISRU proposals are based on propellants production by processing martian atmosphere. As measured by Viking landers, the lower martian atmosphere is composed by 95.32% of CO2. Seeing the abundance of CO2, the simplest ISRU approach would be to use it directly as an oxidizer without the need of power costing chemical processing. Shafirovich compared various metals and their hydrates as possible fuels and concluded that magnesium is the most promising one. Viking landers analyzed also martian regolith finding that 8.6% by mass consists of MgO, opening the opportunity to produce all the propellant, both the oxidizer and the fuel, in a future martian base.