If you fire the Missile Key at the gate, it should open.

General Alex Miles

Missile Key

Missile Keys are key items in Metroid Prime: Federation Force. Appearing in M03: Smokestack, M11: Uplink and M19: Incursion, the Federation Force is required to find this Key to open a Shield Door. The key is found in the environment, either in the clutches of an enemy or within a nearby crate. In M19, it is frozen inside of an ice stalactite right next to the door. Once it is collected, it can be fired at the door to open it.

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