Clough & Associates Ltd. Page 16 Union Hill Heritage Management Plan HISTORY, CONTINUED 1953 Refinery closed 1955-60 Frewin Brothers operated at the Martha refinery site at Waihi 1970s-80s Mineral Resources (NZ) Ltd acquired licenses, built a processing plant for tailings, carried out exploration and limited mining 1987-8 Martha mine reopened by Waihi Gold Company and conveyor put through Union Hill 1990-present Limited exploration activities on Union Hill 2005 Construction began on Stage 1 of the Favona decline tunnel 2012 Trio Underground Mine commenced production
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