Captain Henry Richard Hancock (1836-1919) arrived in South Australia in 1859 and initially worked as an assayer at the Wheal Ellen mine at Callington. He had intended to return to England but instead was persuaded to join a mining company at Moonta on Yorke Peninsula. In 1869, at the age of 28, he was appointed chief mining captain of the Moonta Mines, a position he held for 34 years. Later he simultaneously held the position of superintendent of the nearby Wallaroo mine. He was a trained surveyor, an exceptional assayer and responsible for many technical innovations. Failing health led to his retirement in 1898, at which point his eldest son, (Henry) Lipson Hancock took over as manager. Captain Hancock died at Burnside in 1919. Both he and his son Lipson were active in the Methodist Church.

Captain John Warren came to Australia initially to work the Kurilla mine near Moonta. He also managed the Paramatta and Hamley mines on Yorke Peninsula before becoming one of Broken Hill's great mine managers (Payton p. 86). In his book Australia's little Cornwall, Oswald Pryor wrote that he earned a reputation as a shrewd and practical miner who, under a pen-name, can be credited with writing satirical verse.

Thomas Cowling arrived in South Australia in 1862 aboard the Murray with Captain Harry East, who had been contracted to manage the New Cornwall copper mine at Kadina. As part of his appointment, Captain East had arranged for Cowling to accompany him as his pitman. (The pitman or lieutenant was the next highest position to mine manager or captain.) The two men had worked together for some years in Cornwall. Three years later Thomas Cowling became manager of the Wheal mine at Moonta. He was then able to send to England for his wife Sarah and three sons. He later became manager of the Yelta Mine and then the Hamley mine. Here he perfected changes to the mechanical jigging equipment which greatly improved the efficiency and cost of ore dressing. (For further information, see BRG 334 - Records of the Yelta Mining Company. These include a monthly cost sheet book, with monthly expenses; mine photograph; and a book of reports on mines around South Australia written by Cowling.) Thomas Cowling died in Adelaide on 12 January 1899.

Malachitt (Malachi) Deeble was second in command of the Wallaroo and Moonta Mining Company. He was born at St. Austell, Cornwall where he learnt the mining trade. Before coming to South Australia he had jointly managed a Queensland cattle station. He worked for the Wallaroo and Moonta Mining Company for 38 of the 54 years he spent in South Australia and became second in command to Captain Hancock. Captain Deeble died in Adelaide in 1904, aged 83 years. He was survived by two sons and three daughters.

Payton, Philip J. Making Moonta : the invention of Australia's little Cornwall, Exeter : University of Exeter Press, 2007

Carmichael, E The ill-shaped leg : a story of the development of Yorke Peninsula [Fullarton, S. Aust.] : E.J. Carmichael, 1973

Gee, Lionel C. E. and Brown, H. Y. L. Record of the Mines of South Australia, 4^th edtion, Adelaide, 1908.

Jack, R.L. The salt and gypsum resources of South Australia Adelaide : Dept. of Mines ; 1921

Paget, D.L. Of miners and Methodists : historical sketches of Yorke Peninsula & beyond North Yelta, S. Aust. : Mushroom Graphics, c1988

Pryor, O Australia's little Cornwall Adelaide, [S. Aust.] : Rigby, 1962

Wilson, J.G. Southern and central Yorke Peninsula : its industries, resources and attractions Adelaide : Sharples Bros., [1909]