Location |
Region II, Chile |
The Sierra Gorda mine is located in the Atacama desert, in the Sierra Gorda administrative area in the Antofagasta region, in northern Chile, approx. 60 km south west of the city of Calama. The mine is situated at an altitude of 1,700 meters a.s.l. and 4 km from the town of Sierra Gorda.
On 1 July 2015 the Sierra Gorda mine commenced commercial production (since then it has prepared statements of profit or loss). The ore is extracted using explosives, and next is loaded and hauled away in trucks to the processing plant, where it is crushed and milled.
The end product of Sierra Gorda’s processing plant is copper concentrate and molybdenum concentrate |
Ownership*
|
55% KGHM INTERNATIONAL LTD,
45% SMM SIERRA GORDA INVERSIONES LIMITADA,
incl. respectively:
-Sumitomo Metal Mining Co., Ltd. (31.5%)
-Sumitomo Corporation (13.5%) |
Type of mine |
open pit |
Main ore type |
copper ore |
Associated metals |
molybdenum, gold |
Mine life |
23 years for the current deposit based on phase 1 of the investment, including actions to remove bottlenecks. Moreover, there is a possibility to extend the mine’s life using new deposits |
End product |
copper concentrate, molybdenum concentrate |
Payable production in 2021 |
189.8 kt of copper in concentrate, 14.9 million pounds of molybdenum in concentrate – on a 100% basis, share of KGHM Polska Miedź S.A. is 55% |
* In 2021, Sumitomo Metal Mining Co., Ltd. and Sumitomo Corporation made a decision to sell all of their interests in the joint venture company Sierra Gorda SCM to the Australian mining group South32. The Management Board of KGHM Polska Miedź S.A. decided to refrain from exercising its right of first refusal to acquire the shares of the company Sierra Gorda SCM. In the first quarter of 2022 the shares belonging to Sumitomo Metal Mining Co., Ltd. and Sumitomo Corporation were transferred to South32.
In 2021, actions were continued aimed at limiting the negative impact of the COVID-19 pandemic by implementing safety measures. Sierra Gorda concentrated on implementing an optimisation program aimed at improving the work of the mine, processing plant, infrastructure and tailings storage facility.
The actions taken resulted in an increase in the annual average daily volume of the mine’s sulphide ore throughput from a base level of 110 thousand tonnes of ore daily to the level of 129 thousand tonnes of ore daily. Going forward the Sierra Gorda mine is aiming to increase the plant’s cost and operating efficiency.
In 2021, an agreement was signed involving the transfer of the Oxide project from the structures of KGHM Chile SpA to Sierra Gorda SCM. Preparatory actions were also continued as regards subsequent stages to develop the project, involving among others the commencement of work on updating project documentation. The Sierra Gorda Oxide project involves the leaching of the copper oxide ore of Sierra Gorda on a permanent heap and the production of high-quality copper cathodes in a solvent extraction and electrowinning (SX-EW) installation, with production capacity of approx. 30 thousand tonnes/year. At present most of the oxide ore planned for processing has already been excavated and is currently stored near the site of the future plant.