Robinson Mine

History and current operationsEdit

Around 1868, prospector Thomas Robinson discovered gold and silver, along with widespread, low-grade copper, in what became the Robinson Mining District. From around 1892 to 1907, several gold mines were opened, but none were successful. Around 1907, interest turned towards copper.

Under the tutelage of Daniel C. Jackling in 1905, Nevada Consolidated Copper Corporation (Nevada Con) began copper mining in the Veteran Mine. "The resulting mine was an impressive open-pit and satellite cave."

During World War I and until the Great Depression, Nevada Con employed some 1000 - 1200 men in their underground mines. Underground mining ended around 1949. Future production would come from open-pit mining.

In late 1906, the Guggenheim interests acquired control of Nevada Con, as a part of their rapidly growing copper-mining business. In 1932, Nevada Con became a wholly owned subsidiary of Kennecott Copper, another Guggenheim-controlled company.

In September 1978, Kennecott closed its Nevada mines, and in 1983 the McGill smelter was also closed. Recorded production from 1908 to 1978 was more than 4 billion pounds of copper and 2.7 million ounces of gold.

Magma Copper bought Robinson in 1991 and began work on reopening the mine in 1994. In 1996, BHP acquired Magma, and operated Robinson from 1996 to 1999. Magma/BHP invested around $US 480 million in the mine and plant. The mine was closed in 1999 due to low copper prices. Quadra Mining bought Robinson in 2004, and reopened the mine late that year. Since 2005, production has averaged about 125 million pounds of copper per year. In 2010, Robinson produced 109 MM lbs copper and 73,000 troy oz gold. In 2012, Quadra was acquired by KGHM Polska Miedz, a large Polish copper producer. As of March, 2012, the Robinson Mine has over 620 employees.

In the 1990s, a new crusher mill was built at the Magma Robinson mine for the purpose of re-processing all of the waste piles onsite, as well as to process new ore. The crusher was atop a slurry process lagoon that allowed these years old waste piles to be processed to extact: Gold, Silver, Copper, Vanadium, and Tantalum; at one time and in one process. In the past, each metal extraction had required a separate process, and each waste pile exhibited metal ores that had not been extracted. Significant metals were extracted from these waste piles. This crusher mill and processing building were built by TIC - The Industrial Company of Steamboat Springs Colorado.

GeologyEdit

Paleozoic limestones, shales and sandstones were intruded in the Cretaceous by a quartz monzonite porphyry. This intrusion metamorphosed the surrounding sediments creating a tactite zone in the altered limestone up to 150 meters away, producing porphyry ores with traces of gold. Chalcopyrite is the primary ore mineral, which can be altered by chalcocite.