This report is being submitted under protest. Co. does not believe this incident meets the criteria outlined in 30 CFR Part50 defining an accident. At approx 2am, a greater than 1.0% of CH4 was encountered at the last strap at the top of the wedge in the 8A face. This CH4 was encountered during the investigation of an uncharted void which was intersected in left rib of the seam.