www.historicironmines.com NJ/NY Historic Mines
www.longpondironworks.org Long Pond Historic Site
www.mindat.org Mineral Database
www.mineexplorer.org.uk UK Miners
www.2drx.com West Coast Miners
CT Miners Connecticut and NY Underground Miners
Abandoned but not forgotten Excellent photo showcase of abandoned USA places
Adit Now UK Miners with amazing underground photographs
Camce.org California association of mine and cave exploration.
The Road to Ruins Things abandoned in NY/NJ and beyond