Dytallix B
From Star Trek : Freedom's Wiki
Dytallix B is the fifth planet of the Mira Antliae system, and one of seven uninhabited planets. The planet is tidally locked, with temperatures reaching 180 °C on the day side.
Prior to the 2360s, Dytallix B had was mined for the Federation by the Dytallix Mining Company. The mines were located in the temperate zones between the day and night hemispheres. it is supposed that the material mined there was Duranium
By 2364 the mines were long abandoned and were used a secret meeting place by Starfleet Captains Walker Keel, Rixx, Tryla Scott, and Jean-Luc Picard to discuss the infiltration of Starfleet Command by Neural Parasites. (TNG: "Conspiracy")