M15: Mother Lode is the fifteenth mission in Metroid Prime: Federation Force. It takes place on Excelcion. The Federation Force is tasked with infiltrating an abandoned Galactic Federation mine that has been overtaken by the Space Pirates. They must escort a Cargo Tram filled with minerals to the planet's surface. During the mission, Space Pirates and Zurburats attack the soldiers, and the tram. Parasites are also present. The tram has a machine gun mounted on it, but it has a slow rate of fire. If necessary, the tram can be stopped. The tram will eventually reach a spaceport and must be defended until it and the Force can be extracted. The bonus objective is to kill 20 Zurburats, which can be easily done when the tram is going down one corridor. Zurburats spawn in large numbers behind it. At the end of the mission, the extraction ship collects the tram and destroys the base.
Galactic Federation Log: Trams
We've detected small, wild xenoforms within the mines. It's possible that the temperature fluctuations are the cause of this migration. Native xenoforms pose a moderate risk, so defensive armaments have been added to the trams--just to be safe.
Galactic Federation Log: Excavation Report
The mine has shown a marked decrease in productivity, most notably in the quality of the minerals being excavated.
Rather than dig into a deeper layer, the decision has been made to relocate the mine to a new site. Operations at this mine will be shut down.
Mission briefing[edit | edit source]
Pre-mission[edit | edit source]
"We've received word of Space Pirate activity at an abandoned Federation mining outpost. It appears they've brought the mine back online.
According to our data, the Pirates have gone deeper than the mine previously went, and have been removing an unknown material as a result.
In order to transport the minerals they're mining, the Space Pirates have set up a route for trams. They load the minerals onto these trams and then bring them up.
Your mission is to infiltrate the base, seize control of a tram that's been loaded, and bring it to the surface for transport.
Once you emerge, I'll send a cargo ship to come collect your valuable cargo.
We're expecting strong resistance at the mine. Stay on your toes and come back in one piece, Marine!"
Post-mission[edit | edit source]
"Good work, Marine. That mission was more dangerous than we'd anticipated, but you pulled it off.
We got the minerals you collected to the research team right away, but they couldn't find anything remarkable about them on their own...
I have no doubt that this discovery is why the Space Pirates were so determined to keep us from recovering our liquid resource samples.
They must be using this massive power source for some sort of evil purpose. I've got a bad feeling about this."