University of Wales Swansea
Library and Information Services
South Wales Coalfield Collection
Archives
South Wales Miners' Library
Coalfield Web Materials - digitisation project funded by the New Opportunities Fund

Partners
London Metropolitan University - TUC Collections
University of Nottingham - Manuscripts and Archives
University of Warwick - Modern Records Centre
National Library of Wales 
Public Record Office 

Other RSLP projects based in Wales
Mapping Wales
Wales 1801-1919

Other related organisations
National Union of Mineworkers
Royal Commission on the Ancient and Historical Monuments of Wales
Archives Hub

Coal mining

Wales
[ NB Material relating to Wales is also included in some of the General sites listed below]

Aberfan Disaster
Cefn Coed Colliery Museum 
Rhondda Heritage Park
South Wales Miners' Museum
South Wales Mines Database
Tower Colliery
Tower Colliery - exhibition by Roger Tiley

General
British Mining Database
Coal Mining History Resource Centre
Mining History Network at Exeter University
Mining history research and exploration
National Mining Museum
National Mining Memorabilia Association
Scottish Mining Museum

Mining disasters
Aberfan Disaster
Mining disasters
Mines rescue