The document is available here (34 pages, 1.6 mb PDF).

Two furnaces were built at Karangahake. They both used the same building on Battery Flat. This was at a site downstream of the confluence with the Hauraki Stream, an area now largely covered by moderately sized trees (amenity plantings c. 1985?).

1886  

September. La Monte Furnace started[i]

1888

October. Parkes' furnace started. [i]

[i]  https://paperspast.natlib.govt.nz/newspapers/NZH18880927.2.59

New Zealand Herald, Volume XXV, Issue 9170, 27 September 1888, Page 6

i] https://paperspast.natlib.govt.nz/newspapers/BOPT18860902.2.8.1

Bay of Plenty Times, Volume XIV, Issue 2032, 2 September 1886, Page 2