Codename: COALMINER

Codename: COALMINER is an ONI operative.

In 2552, COALMINER was involved in the classified project Operation: HYPODERMIC. COALMINER detected an intrusion, but not the identity of the intruder, which the intruder went in the ONI database which threatened to compromise HYPODERMIC. COALMINER then informed Codename: SURGEON of the security breach. To minimize the damage COALMINER deleted the UNSC Circumference from the database of Reach Station Gamma.

COALMINER is also mentioned in Ghosts of Oynx and could be a ONI opertive ssigned to Oynx and then reassigned to Reach in time for the First Battle of Reach.

This would cause difficulties later during the Battle of Reach as it prevented the AI, Doppler, from erasing the Circumference's NAV database as per the Cole Protocol, and requiring a SPARTAN-II team to destroy the ship, and the team suffered casualties in the process.