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Resolution Copper (RCM) is a joint venture owned by Rio Tinto and BHP formed to develop and operate an underground copper mine near Superior, Arizona, U.S. The project targets a deep-seated porphyry copper deposit located under the now inactive Magma Mine.
A 300-ton-per-day concentrator was built in 1914. In 1915, a narrow-gauge railway connected Superior with the Southern Pacific Railroad, which was converted to standard gauge in 1923. A smelter was built in 1924. [12] After 71 years of production, the Magma mine closed in August 1982 due to high operating costs and declining copper prices.
William Boyce Thompson bought the old Silver Queen Mine in 1910, and by 1912, the new Magma Copper Company was in production running the operations of the Silver Queen Mine. The Magma Copper Company became one Arizona's greatest copper producer after the silver vein of the Queen Silver Mine dried and ran out. [2] [3] [4] [5]
Magma Engine No. 5 switching in Superior, 1967. The Magma Arizona Railroad (reporting mark MAA) was built by the Magma Copper Company and operated from 1915 to 1997.. The railroad was originally built as a 3 ft (914 mm) narrow gauge line, but was converted to 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge in 1923.
The Magma copper mine became one of the most productive copper mines in Arizona, and through 1964, produced more than 25 million troy ounces (780 metric tons) of silver as a byproduct of copper mining. [4] Miners exhausted the best silver ores in the area by the mid-1880s, most of the mines closed, and most of the towns were deserted.
Magma was a populated place situated in Pinal County, Arizona, United States. [2] It has an estimated elevation of 1,519 feet (463 m) above sea level. [1]Better known as Magma Junction, it is the junction of the Magma Arizona Railroad with the Southern Pacific mainline, approximately 30 miles east of Superior.
Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 323 electoral votes and Romney at 191.
The Hotel Magma, is a historic hotel located at 100-130 Main Street between North Magma Avenue and Magma Alley in Superior, Arizona. The hotel's initial structure is a two-store reinforced concrete building at 100 Main Street. An adobe addition was built in 1916 but collapsed in 2007. In 1923 a brick addition, labelled "Macpherson's Hotel Magma ...