The possibility of tracing the raw material sources of archaeological flints by elemental analysis has, in recent years, been investigated by a number of groups of workers. Characterising the composition of source material has usually been carried out, for reasons of economy, by analysing a relatively small number of samples, typically 10-20. To examine the distribution at mine sites in more detail and to determine the likely chemical location of some trace elements in flint, two sources were more extensively sampled.