Place and date:

For the issuing office:São Paulo, 21, March, 2018 DNV GL – Business Assurance

Av Alfredo Egydio de Souza Aranha, 100 - Bloco D- 3ºandar - Vila Cruzeiro, São Paulo, SP, Brazil

Mauricio VenturinManagement Representative

Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid.ACCREDITED UNIT: DNV GL Business Assurance B.V., ZWOLSEWEG 1, 2994 LB, BARENDRECHT, NETHERLANDS. TEL:+31102922689. assurance.dnvgl.com

MANAGEMENT SYSTEM CERTIFICATECertificate No:148202-2014-AQ-ARG-RvA

Initial certification date:03, February, 2006

Valid:03, February, 2018 - 03, February, 2021

This is to certify that the management system of

Alex Stewart International Argentina S.A.

has been found to conform to the Quality Management System standard:ISO 9001:2015

This certificate is valid for the following scope:Preparation and physical-chemical analysis of minerals samples, physical-

Preparación y análisis físico-químicos de muestras de minerales, análisis físico-químicos y microbiológicos de muestras de aguas, suelos y aire, inspección, supervisión de peso, calidad y muestreo de produtos agroindustriales embarcados.

chemical and microbiological analysis of sampling of water, soil and air, inspection, weight, quality supervision and sampling of agroindustry products embarked.

Rodriguez Peña 1140, M5516BBX, Maipú, Provincia de Mendoza, Argentina and the sites as mentioned in the appendix accompanying thiscertificate

Certificate No: 148202-2014-AQ-ARG-RvAPlace and date: São Paulo, 21, March, 2018

Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid.ACCREDITED UNIT: DNV GL Business Assurance B.V., ZWOLSEWEG 1, 2994 LB, BARENDRECHT, NETHERLANDS. TEL:+31102922689. assurance.dnvgl.com

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Appendix to Certificate

Alex Stewart International Argentina S.A.Locations included in the certification are as follows:

Site Name Site Address Site ScopeAlex Stewart International Argentina S.A.

Calle Rodriguez Peña 1140, M5516BBX, Luzuriaga, Mendoza, Argentina

Preparación y análisis físico-químicos de muestras de minerales

Alex Stewart International Argentina S.A.

Carril Maza Norte 3119, CP5515, Maipú, Mendoza, Argentina

Análisis físico-quimico y microbiológicos de muestra de aguas, suelos y aires

Alex Stewart International Argentina S.A.

Ruta provincial 43, Parque Industrial, CP9040, Perito Moreno, Argentina

Preparación y análisis físico-químicos de muestras de minerales

Marcelo T. Alvear 925, piso 3, C1058AAM, Ciudad Autónoma de Buenos Aires, Argentina

Inspection, weight, quality supervisionand sampling of agroindustry productsembarked.

Inspección, supervisión de peso, calidad y muestreo de productos agroindustriales embarcados.

Physical-chemical and microbiological analysis of sampling of water, soil and air

Alex Stewart International Argentina S.A.

Preparation and physical-chemicalanalysis of mineral samples.

Preparation and physical-chemicalanalysis of mineral samples.