OPERATIONS Americas Region

Americas region

Gold Fields’ presence in the Americas region consists of the Cerro Corona mine in Peru and the Salares Norte project in Chile

OPERATIONAL PROFILE
      CERRO CORONA   SALARES NORTE  
  Mining method   Open pit   Open pit  
  Infrastructure   One open pit. One standard sulphide flotation plant with a capacity of 6.9Mtpa   Open pit with combined counter-current decantation, Merrill-Crowe and Carbon in Pulp (CIP) processing at 2Mtpa. Dry-stack tailings disposal  
  Mineralisation style   Porphyry (Cu-Au)   High-sulphidation epithermal (Au-Ag)  
  Mineralisation characteristics  
  • Mineralisation hosted by a sub-vertical cylindrical shaped diorite porphyry
  • Copper-gold mineralisation conforms to classic porphyry vein definition
  • Mineralisation zones discontinuous with mid-range predictability
 
  • Gold mineralisation is hosted by intensely silica and alunite altered and oxidised rocks. Most mineralisation occurs in breccia rocks formed by explosive volcanism
  • Gold is the primary economic metal with silver having secondary importance
 
Regional information

Cerro Corona mine – Peru (99.53% attributable to Gold Fields)

Cerro Corona’s life extension to 2030, first reported last year, is now supported by an FS which has driven improved Resource to Reserve conversion through solutions to key technical challenges related to accelerated mining, stockpile management, hydrogeology, waste rock storage and in-pit TSF hydraulic containment. A study to assess the viability of a further two-year life extension to 2032 will be conducted in 2020.

PROJECT

Salares Norte – Chile

An updated FS was presented to the Board in February 2020 and the Final notice to proceed (FNTP) to construct the mine was subsequently provided. The EIA approval was obtained from Chilean authorities in December 2019. The Mineral Reserves estimate is 3.5Moz gold and 39Moz silver, equating to gold equivalent Reserves of 4.1Moz. The project has a current 10-year life-of-mine profiled (11.5 years inclusive of Inferred Resources), with construction scheduled to commence in Q4 2020 with first production in Q1 2023. Step-out drilling proximal to the Salares Norte pit is testing for potential extensions and district exploration continues to return encouraging results warranting more detailed follow up.

Exploration drilling and expenditure

The Mineral Resource for Cerro Corona mine is defined by approximately 97km of exploration drilling. Towards the end of 2018, Gold Fields La Cima (GFLC) completed a campaign that included 4,642m of infill drilling focused on increasing resolution on key lithological contacts to refine the long-term grade model and completion of additional hydrogeological boreholes.

During 2019, a drilling campaign of 11,665m of DD was carried out to assess the economic potential of Resources between the Reserve pit and the Resource pit. During the course of the drilling programme, it became evident that better potential may exist in the mineralisation adjacent to the eastern wall. Priority was given to focus on the drilling in this area. A study to assess the viability of a further two-year life extension to 2032 will be conducted in 2020, focusing on a potential east wall reserve pit cut-back supported by infill drilling and enhanced geological domaining undertaken in 2019.

At Salares Norte, step-out drilling at Agua Amarga North tested areas in excess of 100m outside the current Resource pit shell with encouraging results. Drilling to further assess ore body continuity at Agua Amarga North will continue in Q1 2020. District exploration was primarily focused over the Horizonte Project (formerly known as Pircas), where 14,459m of DD were completed over multiple targets returning encouraging results during the year. The Brecha West target was defined using geological mapping, geophysical surveys and geochemistry, and exploration drilling is to continue on this target in 2020 after limited DD drilling was completed (1,067m) in 2019.

Salient points

MINERAL RESOURCES

6.1Moz gold,
43.7Moz silver and
886Mlb copper

MINERAL RESERVES

5.0Moz gold,
39.3Moz silver and
619Mlb copper
AMERICAS REGION MINERAL RESOURCES AND RESERVES 2019 PDF - 7MB
REGIONAL LEADERSHIP

Luis A. Rivera

Executive Vice President:
Americas Region

Mr. Rivera joined Gold Fields in October 2016. Prior to joining Gold Fields, Mr. Rivera was, since 2014, the Vice-President of Operations for Las Bambas and before that, since 2013, was the General Manager of Copper Operations for Glencore Peru and, since 2012, Executive General Manager for all Xstrata Copper Operations in Peru. His career also includes 5 years as General Manager of the large Copper Tintaya and Antapaccay operations, as well as 11 year experience in the Xstrata Copper Operations of Minera Alumbrera, a large gold – copper operation in North Argentina, where he became Tech Services Manager after servicing as Chief Engineer and Senior Geologist. Mr. Rivera has over 28 years’ experience in the copper and gold mining industry, in large open pit copper project and operations in Peru and Argentina, including his direct involvement and leadership in the merge & acquisition of Falconbridge Inc. and BHP Tintaya S.A. by Xstrata Copper as well as the sale of Las Bambas Project by Glencore.

OUR CONTRIBUTIONS TO HOST COMMUNITIES AND GOVERNMENT IN 2019
Employment

898

Procurement

US$32m

SED investments

US$6m

Tax and royalties

US$60m

SHARING OUR STORIES

With over 10 000 employees, Gold Fields stories are happening in mines, projects, offices and communities around our operations every day. We are thrilled to be able to share some examples of the good work and passion of the Gold Fields family with our stakeholders.

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