Embodiments disclosed herein include a portable radial stacker for stockpiling bulk material. The stacker may include a linear conveyor having a rear portion including a hopper, and a front portion, the conveyor being designed to carry bulk material along an elevating path from a low position adjacent the rear portion to a higher position adjacent the front portion. The hopper may be pivotally mounted to the conveyor at a pivot point, with at least one hopper arm extending between the hopper and the conveyor rearward of the pivot point. The at least one hopper arm may include at least one hopper hydraulic cylinder to extend and retract the effective length of the hopper arm to raise and lower a rear end of the hopper to modify a degree of elevation of the hopper.