Jez Lowe has been mentioned a few times but he really is the modern master of coal mining songs:

Cursed be the Caller
Last of the Widows (one of the most beautiful & tragic songs ever written)
Mike Neville Said it So it Must be True (a wonderfully wry reflection on the devestation of the industry)
Greek Lightning ( a song that many sons of miners - like me - will weep to)
& many more!