| 1875 | 3 March. Ohinemuri Goldfield was opened |
| 1876 | August 3. Karangahake Gold Mining Company's battery with 12 head of stampers started |
| August 16. Wick’s battery of nine stamps on Mangakara Creek started | |
| August 30. Waitekauri Battery started | |
| 1877 | January 9. Perry’s battery of 20 stamps at Owharoa started |
| 1878 | Late 1878 saw McCombie and Lee testing a large reef on Pukewhau spur. |
| 1880 | Nicholl and Majurey leave the Te Aroha goldfield late 1880, and venture to the Waihi Plains. |
| 1881 | 17 January, Nicholl made the first public announcement of his find |
| End January. Nicholl had trial parcel crushed at the Smile of Fortune Battery Owharoa. | |
| 16 February, he applied for three acres, one rood, and 26 perches as his Martha claim. Granted 24 March. | |
| Late June FA White set up Martha Gold Mining and Quartz Crushing Company | |
| 1882 | 24 May. Martha Battery completed, officially opened with a gala event. |
| 23 June. Waihi Company Battery completed (with Cabbage Tree Creek (Waimata Stream) water race) | |
| 1883 | 31 March. Martha Extended Company was launched, Mr J. H. Moore manager (amalgamation of Martha, Waihi and Young Colonial). Not Dulcibel |
| April. Firth and Clark Battery at Waiorongomai opened | |
| October-November, Martha Extended Company add 10 stamps to its battery, making 30 | |
| 1885 | Rosemont, Union and Silverton mines taken up |
| 12 August. John McCombie marked out Silverton claim | |
| 1886 | Silverton Company using 10 stamps at Martha Battery, and saving tailings |
| 1887 | 15 October, Martha and Silverton manager John H. Moore left for Maratoto. Tributers took over (includes Hollis) |
| December. Waihi Gold Mining Company Limited floated in London | |
| 1888 | Construction of Waihi Battery on Union Hill commenced |
| February. Martha Extended Company mine and battery for sale | |
| 1890 | 23 April. Battery sold to Thomas Henry Russell for £3000. Offered to the Waihi Company on 7 July |
| 1891 | June. Silverton Company purchased Martha Battery; became Silverton Battery |
| December. Mangatoetoe Stream water race constructed, followed shortly by Mangakiri Stream water race | |
| 1893 | April. Silverton Company fully adopted Cassel process (cyanide); the first in Waihi |
| 1894 | May. Cyanide plant at the Waihi Battery complete |
| 1895 | Silverton mine sold. Became Waihi-Silverton Gold-mining Company (Limited), Glasgow |
| Silverton Tramway constructed, dam on Ohinemuri River | |
| Three in-ground kilns constructed at mine, dry crushing at battery | |
| June. Union-Waihi Gold-mining Company Limited split off from Waihi Gold Mining Co., combining the Amaranth, Rosemont, Golden Run, and Union Special Claims | |
| 1896 | 4 April. Upgraded Silverton Battery officially opened. Dry crushing. H.H. Adams the manager |
| 1898 | Victoria Battery starts on first 100 stamps |
| 1899 | Union-Waihi Company purchased Silverton Company and battery, which became the Union Battery. Converted to wet crushing |
| 1901 | November. Waihi Gold Mining Company took over the Waihi-Union Company, and the Union Battery of 40 stamps |
| 1902 | Auxiliary power in form of steam engine and boiler installed at Union Battery. Tramway connection to Martha mine made |
| 16 September. Commenced crushing | |
| 1903 | A new dam and penstock completed, with Leffel wheel |
| 1909 | August. One tube mill added to the plant |
| 1911 | 18 January. Superintendent Barry denies rumour of intention to close the Union mill |
| February. The Waihi Gold Mining Company shut down Union Mill | |
| H.H. Adams purchases the Union Mill, and Waihi Gladstone mine | |
| 1912-13 | Waihi Battery on Union Hill closed |
| 1913-15+ | It seems likely that the Union Battery was "cleaned up" and removed by H.H. Adams |