Description:New Hem Heath ‘the big A’ (1950-1990). This colliery was known as ‘The Big A’ because of its distinctive headgear as seen in the photograph. Work began in 1950 on sinking a new shaft, 24 feet in diameter and 1134 yards deep, the third deepest in the country. In 1979 there were 1790 men employed, with an output of 1,001,368 tonnes. It merged with Florence colliery in 1990 to become Trentham superpit.