There are three Mining licences as follows: Mining licences This layer shows the spatial distribution of mining licences currently held by companies in Northern Ireland. Each individual licence is shown in outline. January 2010 Mineral Prospecting Licences This layer shows the spatial distribution of mineral exploration licences held by companies in Northern Ireland. Each individual licence is shown in outline Historic Licence Areas This layer shows the spatial distribution of historic mineral licence boundaries in Northern Ireland. The areas where the boundaries of the licences layers appear to overlap reflect temporally different licence periods for the same area. Further information on this data set is available from GSNI (Contact Mark Patton, e-mail: mark.patton@detini.gov.uk).