Of course there are a multitude of resources on the web, but here are some selected links.

http://www.familytreecircles.com/pukerimu-cemetery-paeroa-burials-1897-1900-53593.html Thank you Ngaire
The Coromandel Heritage Trust site. http://www.thetreasury.org.nz.
A History of Pye Radio Ltd. in Waihi, New Zealand, by Dick Bing. https://leanpub.com/pyeradiowaihi/read
Mill Stream Walkway Historic Features: research and interpretation of the goldmining features at Waihi's Mill Stream and base of Union Hill. http://www.waihiwalkways.org.nz/heritage/millstream/introduction.htm
Te Aroha Mining District Working Papers: Dr Philip Hart, Historical Research Unit, University of Waikato. http://researchcommons.waikato.ac.nz/handle/10289/10304
The Waihou and Ohinemuri River Scheme, 1911 - 1928. Donald Cochrane. http://the-lothians.blogspot.co.nz/2017/04/the-waihou-and-ohinemuri-river-scheme.html