Black Rock Quarry Restricted Area. If you have an unlocked fast travel point there. There is this large door with an elevator behind in the quarry.
Darlings Black Rock Lab head upstairs and open the chest youll find there. 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. Just before reaching the main part of the quarry turn.
Case Files - Plastic Tree Procedures.
When doing the quarry mission find black rock for Dr Marshall I stumbled upon a hidden location with sniper HISS guys and weird colored rocks that seemed to kill me via radiation or something. Find a Black Rock Prism. How to leave the Black Rock Quarry restricted area Foundation. This would lead you to a mold-infested area.