Following the death of Margaret Thatcher last week, commentators on both the left and the right have been compiling lists of myths about her time in office. Here, I examine the widespread claim that she destroyed the British coal mining industry. In particular, I assemble three graphs for the period 1950-1994: one depicting the trend in coal mining output; one depicting the trend in total number of coal mines; and one depicting the trend in coal mining employment. Evidently, the decline of the British coal mining industry began in the late 1950s, and then continued through both Labour and Conservative governments up until the mid 1990s. Moreover, the decline was not unusually rapid during Thatcher's time in office. The data are from the Department of Energy and Climate Change.