Senate federal level. Similarly in Argentina, in addition to the Senate at federal level, eight of the country's provinces, Buenos Aires, Catamarca, Corrientes, Entre Ríos, Mendoza, Salta, San Luis (since 1987) and Santa Fe, have bicameral legislatures with a Senate. Córdoba and Tucumán changed to unicameral systems in 2001 and 2003 respectively. In Australia and Canada, only the upper house of the federal parliament is known as the Senate. All Australian states other than Queensland have an upper house known as a Legislative council. Several Canadian provinces also once had a Legislative Council, but these have all been abolished, the last
Catamarca Province San Francisco pass and mules were bred for the Bolivian market in the 1910s. Mining was important in the past. After becoming less active in the early 1990s, grew to now account for over 20% of the economy. Catamarca is home to one of the largest copper gold mines in the world, Bajo de la Alumbrera, which produces approximately 600,000 ounces of gold and 190,000 tonnes of copper annually. The mine employs over 1,000 people and contributes hundreds of millions of dollars in taxes and royalties to the federal and provincial governments. The agriculture of Catamarca focuses on wood (walnut),