This is the first part of the Buraysis Operation.  The purpose of this operation is to interfere with enemy  re-supply efforts and smash a hole in the alien's inner defenses.
Your target in this mission is the Biomass Well.  The Well serves as the enemy's largest storage facility on OREC Prime and its destruction will cripple their defensive efforts.
The Well is situated inside a giant crater of unknown origin.  You will be dropped to the south of the well and proceed north to eliminate the outer defenses.
The entire area is very well guarded, so be careful for traps.  You must destroy the Biomass Well itself and all storage buildings in the area.