Question: Which country is the home of Mount Keith Mine, and the world's largest mining company which operates it?

Context paragraphs:
BHP: BHP, the trading entity of BHP Billiton Limited and BHP Billiton plc and formerly known as BHP Billiton, is an Anglo-Australian multinational mining, metals and petroleum dual-listed public company headquartered in Melbourne, Victoria, Australia.  Founded in 1885 in the isolated mining town of Broken Hill, it was the world's largest mining company measured by 2015 market values and Australia's fourth-largest company (by revenue), formerly the largest.

Maaden (company): MA'ADEN (Saudi Arabian Mining Co.) is a diversified mining company, active in gold base metals mining and infrastructure industry.  Ma'aden was formed as a Saudi joint stock company on 23 March 1997 for the purpose of facilitating the development of Saudi Arabia’s mineral resources.  It is the largest mining company in Saudi Arabia.  The Saudi government still owns 50% of its shares while the remaining 50% are listed in Tadawul (Stock Market).  The company is structured with corporate headquarters in Riyadh with several subsidiaries.

James MacNaughton: James MacNaughton, also variously known as "the King of Houghton County", the "Czar of the Copper Country" or simply "Big Jim" (b. March 4, 1864) was the third and last known President and General Manager of the Calumet and Hecla Mining Company during the hate-filled Copper Country Strike of 1913–1914.  In addition to the Calumet and Hecla Mining Company, MacNaughton was also the General Manager of the Ahmeek Mining Company, Allouez Mining Company, North Kearsarge mine, South Kearsarge mine, Tamarack Mining Company, Osceola Consolidated Copper Company, St. Louis Copper Company, Laurium Mining Company, La Salle Copper Company, Isle Royale Copper Company, Superior Copper Company, and the Centennial Copper Mining Company.  MacNaughton also held a position as the Chairman of the Houghton County Board of Supervisors and the first chairman of Miscowaubik, a private business club headquartered in Calumet, Michigan.

Mount Keith Mine: Mount Keith Mine is an open pit nickel mine in Western Australia.  It is operated by BHP.  The site's closest landmark is the town of Wiluna, 85 km to the north.

Quincy Mine: The Quincy Mine is an extensive set of copper mines located near Hancock, Michigan.  The mine was owned by the Quincy Mining Company and operated between 1846 and 1945, although some activities continued through the 1970s.  The Quincy Mine was known as "Old Reliable," as the Quincy Mine Company paid a dividend to investors every year from 1868 through 1920.  The Quincy Mining Company Historic District is a United States National Historic Landmark District; other Quincy Mine properties nearby, including the Quincy Mining Company Stamp Mills, the Quincy Dredge Number Two, and the Quincy Smelter are also historically significant.

Mount Keith Airport: Mount Keith Airport (IATA: WME, ICAO: YMNE) is located at Mount Keith Mine, Western Australia and is operated by BHP Billiton.

Yeelirrie Station: Yeelirrie is an East Murchison pastoral lease or sheep station on State Crown land, located approximately 80 km south west of Wiluna, in the Mid West region of Western Australia.  The nearest population centre to Yeelirrie homestead is Mount Keith Mine village, 45 km to the east.  The regional centre is Meekatharra, located 180 km to the west.

Vale Limited: Vale Canada Limited (formerly Vale Inco, CVRD Inco and Inco Limited; for corporate branding purposes simply known as "Vale" and pronounced in English) is a wholly owned subsidiary of the Brazilian mining company Vale.  Vale's nickel mining and metals division is headquartered in Toronto, Ontario, Canada.  It produces nickel, copper, cobalt, platinum, rhodium, ruthenium, iridium, gold, and silver.  Prior to being purchased by CVRD (now Vale) in 2006, Inco was the world's second largest producer of nickel, and the third largest mining company outside South Africa and Russia of platinum group metals.  It was also a charter member of the 30-stock Dow Jones Industrial Average formed on October 1, 1928.

Orkla Mining Company: Orkla Mining Company Ltd. (Norwegian: Orkla Grube-Aktiebolag) was a Norwegian mining company established in 1904.  The company was the largest mining company in Norway in the aftermath of World War I, and was among the world's largest pyrite producers.  After closing of the mining operations in 1987, the company developed into the holding company Orkla ASA, which is among the largest companies at Oslo Stock Exchange.

Anaconda Copper: Anaconda Copper Mining Company (from 1899 to 1915, known as the Amalgamated Copper Mining Company) was an American mining company.  It was one of the largest trusts of the early 20th century.  Founded in 1881 when Marcus Daly bought a silver mine, the company expanded rapidly based on the discovery of huge copper deposits.  Daly built a smelter to process copper mined in Butte, Montana.  By 1910, Anaconda had expanded its operations and bought the assets of two other Montana copper companies.  In 1922 it bought mining operations in Mexico and Chile; the latter was the largest mine in the world and yielded two-thirds of the company's profits.  The company added aluminum reduction to its portfolio in 1955.

Supporting paragraphs: Mount Keith Mine BHP
Answer: Australia