By Susanna Twidale LONDON (Reuters) -A UK government decision on whether to allow a new coal mine in Cumbria, northwest England, was delayed for up to six weeks after Michael Gove, the minister responsible for the relevant department, was sacked by Prime Minister Boris Johnson. Johnson himself said on Thursday he was resigning, bowing to a barrage of calls to quit from ministerial colleagues and lawmakers.[nL8N2YO1BH] Gove, Secretary of State for Levelling Up, Housing and Communities, had been expected to announce on Thursday whether the mine, being developed by privately owned West Cumbria Mi…