The North Wales Coalfield, of which Gresford was part, runs from Point of Ayr, on the Flintshire coast to the Shropshire border.
[4] Mechanisation, believed by the workers and unions to improve working conditions, created more dust and explosions, in an economic climate where the government were reluctant to enforce regulation.
On 25 September, rescuer George Brown was killed on the surface when another explosion blew a seal off the Dennis shaft and he was hit by flying debris.
Sir Henry Walker, the Chief Inspector of Mines, chaired the inquiry which opened on 25 October 1934, at Church House, Regent Street, Wrexham.
Walker was assisted by John Brass, for the mine owners; and Joseph Jones for the Miners' Federation of Great Britain (MFGB).
[1] Walker wanted access to the evidence, and although the pit was reopened in March, 1935, for safety reasons the Dennis section remained closed, and was eventually sealed.
[6] The colliery had made an operating loss in 1933, and the manager, William Bonsall, had been under pressure from the Dennis family to increase profitability.
The miners' appointed Assessor also surmised that a large quantity of gas had accumulated at the top of the face in 14's district, which was then ignited by an accident with a safety lamp or by a spark from a coalcutter.
After the report was presented to parliament in January 1937, in April 1937, at Wrexham Petty Sessions, 42 charges were made against the colliery company, the manager and officials.
Most were withdrawn or dismissed, but manager William Bonsall was convicted on eight counts of breaking mining safety law, and fined £140 with £350 costs.
[1] The national and local newspapers focused on stories of heroism and bereavement, with speculation about who was at fault, or what caused the disaster left alone.
The local committee which met in Wrexham took monies from both funds, and appointed a visitor to ensure that immediate relief was distributed in the form of grants and temporary weekly allowances.
[2] Gresford was officially closed on 10 November 1973 due to a combination of exhaustion of existing coal reserves and geological problems.
[1] On the 75th anniversary in 2009, various memorials took place, including Wrexham Football Club delaying their match by 15 minutes - as they would normally have done in the days when the mine was working.