Question: Charles Helm was part of the Rudd Concession along with which British mining magnate?
Context: Cecil John Rhodes PC (5 July 1853 – 26 March 1902) was a British businessman, mining magnate and politician in South Africa, who served as Prime Minister of the Cape Colony from 1890 to 1896.  An ardent believer in British imperialism, Rhodes and his British South Africa Company founded the southern African territory of Rhodesia (now Zimbabwe and Zambia), which the company named after him in 1895.  South Africa's Rhodes University is also named after him.  Rhodes set up the provisions of the Rhodes Scholarship, which is funded by his estate, and put much effort towards his vision of a Cape to Cairo Railway through British territory. The Sierra Leone Selection Trust was formed in 1934 following an agreement between the government of Sierra Leone and the Consolidated African Selection Trust Ltd (CAST).  CAST was formed in 1924 and was part of a much larger mining finance house Selection Trust Ltd which had been founded in 1913 by Alfred Chester Beatty (an American mining magnate.  Although the Oppenheimers (De Beers) invested in CAST and its subsidiaries from the 1920s and had boardroom representation, CAST was independent of the Oppenheimer empire.  SLST corporation which had exclusive mineral mining rights in Sierra Leone beginning in 1935 was scheduled to last for 99 years.  In 1955, the SLST abandoned mineral mining and settled on mining the Yengema and Tongo Fields.  However, with the creation of the Sierra Leonean parastatal National Diamond Mining Company in 1971, the diamond company was effectively nationalized, ending the SLST in Sierra Leone. Nathan Tinkler (born 1 February 1976) is a former mining magnate and businessman from the Hunter Region, New South Wales, Australia.  He started out as a mining apprentice in the Hunter Valley, in New South Wales and set up his own business at age 26.  Much of his wealth, most subsequently lost, was acquired from investments in the mining industry. The Rudd Concession, a written concession for exclusive mining rights in Matabeleland, Mashonaland and other adjoining territories in what is today Zimbabwe, was granted by King Lobengula of Matabeleland to Charles Rudd, James Rochfort Maguire and Francis Thompson, three agents acting on behalf of the South African-based politician and businessman Cecil Rhodes, on 30 October 1888.  Despite Lobengula's retrospective attempts to disavow it, it proved the foundation for the royal charter granted by the United Kingdom to Rhodes's British South Africa Company in October 1889, and thereafter for the Pioneer Column's occupation of Mashonaland in 1890, which marked the beginning of white settlement, administration and development in the country that eventually became Rhodesia, named after Rhodes, in 1895. Vanessa Gounden (born 1961) is South Africa's first female mining magnate and arguably most successful female entrepreneur, whose business interest span healthcare services, financial services and lifestyle and leisure.  She served in Nelson Mandela's ANC administration during the 1990s.  She is South Africa's first female mining magnate and one of South Africa's most successful female entrepreneurs.  Vanessa Gounden is an inspirational and driven businesswoman who has made a name for herself in notoriously difficult industries as diverse as mining to fashion. Hermann Ludwig Eckstein (3 August 1847 – 16 January 1893) was a German-born British mining magnate and banker. The Rhodesian Selection Trust (RST) was a mining corporation which produced copper from the Copperbelt region of Northern Rhodesia, now Zambia.  The RST was formed in 1928 by Alfred Chester Beatty, an Irish-American mining magnate, as a holding company for his mining assets in Northern Rhodesia.  The new company received the financial backing of the American Metal Company of New York. The Rhodes Scholarship, named for the British mining magnate and South African politician Cecil John Rhodes, is an international postgraduate award for students to study at the University of Oxford.  It is widely considered to be one of the world's most prestigious scholarships. Established in 1902, it was the first large-scale programme of international scholarships, inspiring the creation of a great many other awards across the globe. Charles Daniel Helm (28 September 1844 – 14 September 1915) was a Protestant missionary and trusted confident of King Lobengula of Matabeleland who played a controversial role as an interpreter during the drafting and signing of the Rudd Concession with agents of Cecil Rhodes's British South Africa Company in 1888. The Meco-Moore cutter loader was an early twentieth-century British mining machine.  It was invented by Mr M. Moore, and developed by the Mining Engineering Company (MECO) of Worcester.  It was a heavy machine (120 hp / 89.5 kW) and was first used in a coal mine in Lancashire, England 1934.  The design was such that it worked along the coal seam (along a "longwall panel") The machine's cutter bars, the "jibs" as they were called, (two in the original model and three in a later versions) were designed to both shear and undercut the coal seam.  The cut coal was cut onto the connected conveyor belt system which took it towards the mine's entrance.  It was, or was among, the first such machines to do both cutting and loading at the same time.  The machine increased both productivity and safety.
Answer: Cecil John Rhodes PC