Adam Girven moved to work at the Hikurangi Coalfield when the Kawakawa Coalfield was running out of coal. There is also information written by Keith Johnston about the related Cunningham family, it is on the following link : http://kjohnsonnz.blogspot.com/2011/02/cunninghams-of-hikurangi-happy-go-lucky.html
Bay Of Islands Coal 1896
Girven in NZ Newspaper3-Coal
Hikirangi Kawakawa Coalfield -Notes
Hikurangi Coal In Newspapers 1893
Hikurangi Coal Newspapers
Hikurangi Coalfield in Newspapers
Hikurangi Coalfield Timeline1
Hikurangi School