Gmx Resources Inc. (Gmxr) Is A Publicly-Traded, Independent Oil And Gas Exploration And Production Company Based In Oklahoma City, Oklahoma That Developed Acreage In Williston Basin, Denver Julesburg Basin, Haynesville/Bossier And Cotton Valley Sand Formations. On April 1, 2013, Gmxr Filed A Joint Chapter 11 Bankruptcy Petition, After An Illiquidity Situation.