Black Rock Quarry Restricted Area. This document is in the control room of the Cable Cart in the Restricted Area north of the quarry. Case Files - Plastic Tree Procedures.
Upon getting to the area where the door is youll unlock the Ability. The Federal Bureau of Control uses the quarry to mine for Black Rock a material highly valuable to them due to its ability to negate paranatural effects. Slow fall down the elevator shaft to reach the Restricted Area.
Just before reaching the main part of the quarry turn.
Tag the control point and head out the locked door. Basically its high up in the south of the quarry. Continue down the almost pitch-black cavern with serious X-Men vibes and several other doors will unhinge to let you into Black Rock Processing. Find a Black Rock Prism.