Planet under Goa'uld control, relatively close in proximity to Earth, used as a mining settlement. SG-14 spent several days there, observing the operations, and managed to escape undetected. The Tok'ra had designated the world to be (for the most part) destroyed, but this operation was halted when two members of SG-1 arrived to gain their attention.
It is not clear if the Tok'ra returned to complete their mission and destroy a sizable chunk of the planet, as their presence was likely discovered.
HOME TO - Unknown
FIRST APPEARED - Tangent
Tangent - Sam and Daniel arrive on P2C-257 to obtain a Tok'ra operative and his Tel'tak prior to blowing up a portion of the world with naquadah.