
Escondida is a
copper
Copper is a chemical element; it has symbol Cu (from Latin ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orang ...
mine at elevation in the
Atacama Desert
The Atacama Desert () is a desert plateau located on the Pacific Ocean, Pacific coast of South America, in the north of Chile. Stretching over a strip of land west of the Andes Mountains, it covers an area of , which increases to if the barre ...
in
Antofagasta Region
The Antofagasta Region (, ) is one of Chile's Administrative divisions of Chile, sixteen first-order administrative divisions. Being the second-largest region of Chile in area, it comprises three provinces, Antofagasta Province, Antofagasta, El ...
,
Chile
Chile, officially the Republic of Chile, is a country in western South America. It is the southernmost country in the world and the closest to Antarctica, stretching along a narrow strip of land between the Andes, Andes Mountains and the Paci ...
.
Geology
The Escondida deposit is one of a cluster of
porphyry coppers in an elongated area about 18 km north–south and 3 km east–west and is associated with the 600 km long West Fissure (''Falla Oeste'') system, which is in turn associated with most of the major Chilean porphyry deposits. A barren, leached cap, in places up to 300 metres thick, overlies a thick zone of high grade secondary
supergene mineralisation of the main orebody, largely
chalcocite and
covellite, which in turn overlies the unaltered primary mineralisation of
chalcopyrite
Chalcopyrite ( ) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a Mohs scale, hardness of 3.5 to 4 ...
,
bornite and
pyrite
The mineral pyrite ( ), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral.
Pyrite's metallic luster and pale brass-yellow hue ...
.
Reserves
At mid 2007, Escondida had total proven and probable
reserves of 34.7 million tonnes of copper, of which 22.5 million tonnes is estimated to be recoverable. Total
resources
''Resource'' refers to all the materials available in our environment which are Technology, technologically accessible, Economics, economically feasible and Culture, culturally Sustainability, sustainable and help us to satisfy our needs and want ...
(including reserves) were 57.6 million tonnes of copper, of which 33.0 million tonnes should be recovered. Exploration continues. As of 2019, the known resource is 21.7 Billion tonnes at 0.54 percent Copper including Escondida and adjacent deposits. The mine and ancillary industries contributes 2.5% to Chile’s GDP.
Operation
Sulfide ore, which contributes 77% of the recoverable copper reserve, is crushed and milled in one of the two concentrators and the copper concentrate is separated out using
froth flotation. Approximately 86% of the copper is recovered. It is piped down to the port of Coloso, where it is dewatered before shipping. Oxide ore, 4% of recoverable copper, is crushed, agglomerated and then acid leached in large heaps, and the copper is recovered from the leach solutions as copper cathode in a
solvent extraction/electrowinning (SX/EW) plant. Recovery is 68%. The low grade sulfide ore contributes 19% of recoverable copper. It is also crushed and dumped on large heaps, but here the leaching occurs through oxidation induced by
microorganisms
A microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was suspected from antiquity, with an early attestation in ...
. The copper is also recovered by SX/EW.
In 2006, 338.6 million tonnes were mined (928,000 tonnes per day), of which 251.5 million tonnes were waste and oxide ore. Sulphide ore totalled 87.1 million tonnes or 239,000 tonnes per day. The two camps, San Lorenzo and 2000, cater to 7,000 people daily. Escondida's current capacity is around 1.4 million tonnes of copper production per year, making it the largest copper mine in the world.
In 2005,
Degrémont Industry was asked to install a new
Sea Water Reverse Osmosis plant with capacity to produce 12 Million gallons of fresh water per day.
Construction of work force accommodation camps and field offices are needed services in order to have the mine operating, on this note Tecno Fast in 2012 was hired to build the second phase of the respective workforce accommodation camp for Escondida Mine.
BHP buys 3
TWh TWH or twh could refer to:
* Tai Dón language, a language of Vietnam, Laos, and China
* Tai Wo Hau station, Hong Kong; MTR station code
* Tennessee Walking Horse, a breed of horse
* Toronto Western Hospital, a hospital in Toronto, Canada
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of electricity per year to operate the Escondida and Spence mines
(1.640 m elevation), where solar energy is more than 3.000 kWh/m
2 per year.
[
]
See also
*Chuquicamata
Chuquicamata ( ; referred to as Chuqui for short) is the largest open-pit mining, open pit copper Mining, mine in terms of excavated volume in the world. It is located in the north of Chile, just outside Calama, Chile, Calama, at above sea level. ...
* El Teniente
* El Salvador mine
* Los Pelambres mine
* Potrerillos, Chile
* Chanarcillo
* El Salvador mine
References
{{reflist
External links
Great Deposits of the World – La Escondida Porphyry Copper, Chile
updated October 17, 2019
Atacama Desert
Copper mines in Chile
Mines in Antofagasta Region
Open-pit mines
Surface mines in Chile
BHP