Instructions
Press the left analog stick to move the scanner cross-hairs across the planet's surface.
Hold the left trigger down to scan as you move the scanner cross-hairs across the planet. Scan the planet until the scanner interface on the right side of the screen spikes up; this indicates a resource vein. The area in which the spike occurs will inform you of the type of resource found.
Press the right trigger to launch a probe at the resource vein; this will cause you to collect the resource found.
Mine the planet in this manner until the planet status at the top of the screen changes to "depleted." This indicates that the amount of resources left on the planet is extremely low.