Methane and ventilation studies in coal mining in the Sydney Coalfield, Nova Scotia

For centuries human society has relied on coal as a principal source of fuel for heat and power. Extraction of this valuable fuel has always been influenced by control over hazards such as water inflows and potentially explosive dust and methane gas. A major focus of the research has been on methane including: methane properties of seams, insitu and laboratory testing; methane emissions; investigation of operational issues (e. g. Phalen 7 East); and refinement of prediction models.This thesis gives an overview of methane and ventilation research covering the following aspects: Defining coal seam characteristics: specific emissions---the relationship between methane content, coal 'rank' and depth; the geothermal gradient; insitu gas pressure; and associated hydrocarbon content of mine air samples analyzed. Defining the performance of Sewergate ventilation, particularly on Phalen 7 East. Sewergate ventilation is a marriage between a typical 'U' and a bleeder ventilation system. Underground measurements including a novel use of 'tubebundles', have provided a clearer understanding of factors affecting Sewergate performance. (Abstract shortened by UMI.