Heritage Open Day: The Kent Mining Museum will not only be open every day of the Heritage Open Days week, but visitors will be able to get a closer look at some special items from the archives, such as the original Betteshanger Kent NUM banner! On certain days throughout Heritage Open Days, from 11 am - 2 pm, the Kent Mining Museum will bring out special items which are normally kept safely in the archives. These days are the 13th September, 16th September, and 18th September. The museum will also be open every day during the Event.