You need to talk to a miner who knows something about the Marauders, and after defending him from a Marauder attack, you locate a Marauder supply cache and steal the contents.
1) Read the email from E.R. Oregon
2) Go to the "Meeting Location" waypoint and talk to the miners.
3) Defend the miners from the Marauders. Use the turret fighters for added firepower, setting them to defend Oregon is a good method.
4) If Oregon survives, he will tell you about the cache and give you a waypoint.
5) If Oregon dies, but you kill the Marauders to avenge him, Clay will locate the waypoint for you. If you flee, or fail to kill the Marauders, the mission is over.
6) Go to the "Beacon Location" waypoint.
7) Fight the Marauders who are defending the cache.
8) If you destroy the freighter before it escapes you can steal the LDS drive it is carrying.
9) When all the Marauders are dead, call in Jafs to pick up the loot.
10) The mission is completed.