Death occurred about 19 December 1903. A well-known one-time secretary of the WA Club in Perth. He is said to have been the discoverer of the Cosmopolitan at Kookynie. The Anglo-Australian Prospecting Syndicate Ltd (Adelaide), a party of three (WA Miller, T Grant and HR Davies) was originally formed to prospect in the vicinity of Arltunga, South Australia. Miller was in charge of the party and after prospecting Arltunga for some time, he received orders to proceed to the Erlstoun district in Western Australia. He added JB Hatch to his party and left Alice Springs on 29 July 1903. The border was crossed after two months travel but supplies were getting scarce and the water question became a serious one. Miller suggested that the party split up about 80 miles north-east of Lake Wells. He left with Davies on 11 December and travelled a south-westerly course. About a week later, camp had to be made as Miller was ailing from aneurism of the heart, a large abscess on his neck distinctly showing the quickened pulsations on the heart. Davies perceived Miller was in a very bad state, gurgling in the throat, and on the night of the 19th, Miller called him as the abscess on his neck had burst. He died shortly afterwards. The next day, Davies buried his mate where he died. Miller, whose wife and family resided in Adelaide, was the prospector and discovered of the Zoroastrian mine at Bardoc and also the discoverer of the Cosmopolitan group of mines.