Management – Piauí Niquel Metais

Guilherme Jácome


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Guilherme is a registered engineer with 20 years’ experience in the mining and infrastructure industry. While a Director at Potássio do Brasil, he was in charge of the development of the Autazes Potash Project in the Amazon, Guilherme went on to become President and was responsible for marketing development, public affairs, licencing and ESG standards. Prior to this, he was a General Manager at Vale, implementing the development of a new management and performance system and supporting an estimated investment plan of US$50 billion. His earlier work at Vale included construction management and business development of the 118 Copper Project, Cristalino Copper Project, Niquel do Vermelho and Salobo Copper Project, mainly in the Amazon region. Additionally, within Guilherme’s career he began the construction of the Onça Puma Nickel Project, where he was responsible to plan and control the overall enterprise, including managing multiple contractors with an investment of US$2.3 billion and 9,000 workers
Ailton Miranda


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Ailton is a qualified Certified Professional Accountant and holds an MBA in Financial Control from Sao Paulo. Ailton is Brazilian, and fluent in English. He joined Piauí Niquel Metais (“PNM”) in June 2014 and has held the position of Financial Manager and acting Company Secretary and has been responsible for all aspects of financial control and accounting for the Piaui project. He has gained international business exposure on Foreign Trade and Commercial Missions to China and Europe. His professional career includes working in 2013 on the turn around at Carpathian Gold’s Mineradora Riacho dos Machados project, where he was involved in cash and working capital management and sovereign debt negotiation, and a further fifteen years in other Brazilian industrial,mining and commercial sectors working in corporate finance, cost and tax restructuring, planning and implementation.
Marcelo Rideg


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Marcelo is a Brazilian biologist with an MBA in Project Management (PMBOK) with over 15 years of experience in Environmental & Social studies and permitting in Brazil.


He began his career performing flora surveys and forest inventories throughout Brazil, and South America. In 2010 Marcelo joined Arcadis SA, a global consulting company, to coordinate the development of technical studies (such as Environmental and Social Impact Assessments) to support the environmental permitting of projects. By 2013 he was the Project Manager & Technical Reviewer for the permitting of several projects in various sectors such as Energy, Industry, Agriculture, and later focusing on Mining (for companies such as Vale, Anglo American and Samarco). In August 2016 Marcelo joined Piauí Níquel Metais as Environmental and Institutional Relations Manager.
David Chiron


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David is a geologist with more than 20 years’ experience in nickel laterite projects including exploration, feasibility studies, engineering, open pit mining and beneficiation plant operations.
He began his career as an exploration and project geologist on deposits around the world, in Australia, The Philippines, Indonesia and The Salomon Islands. David’s strong base in nickel laterite geology comes from New Caledonia, the island where he grew up and then worked for 4 years for SLN (ERAMET). Later working as Mine General Manager at Vale’s VNC where he ramped up the mine from 1 to 6Mwt of ore and made the feed preparation plant more reliable with 1000wt/h of homogenous quality feed to the HPAL plant. This led to the improved production in 2017 of 37kt of nickel and 2,4Kt of cobalt.
David has experience in starting operations from greenfield to sustainable operations, which he has done recently in Pará state with Vale and others. His adaptability, technical and management skills allow him to construct solid teams to help transform projects into reality.
Rogério Dias


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Rogério has a degree in Mechanical Engineering.


With 30 years of experience in management, operation and maintenance of industrial plants, automation, people management and greenfield projects, working in several locations distributed in three continents.


His career was developed in companies such as Votorantim, VALE and Holcim.


In August 2021, Rogério joined Piauí Níquel Metais (PNM) as Production Manager.
Carlos Fonseca


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Carlos is a chartered metallurgical engineer from the “Escola de Minas – Universidade Federal de Ouro Preto” (Federal University of Ouro Preto) in Brazil.
He started his career working for Piauí Níquel in 2016 as a process engineer and was part of the team that refurbished, commissioned, and operated the Demonstration Plant. He then led the initial construction of the PNP 1000 in 2021 and was Project Coordinator within the full team that completed this. He has developed skills in process engineering for nickel laterite heap leaching, as well as project coordination and process management. He is currently the Engineering Manager for the PNP 1000.
Cecília Souza


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Cecília holds a degree in Psychology from the Federal University of Uberlândia and a postgraduate degree in Business Administration and Business Pedagogy.


She has 18 years of experience in the human resource area in both the tourism and mining segments. Cecília has worked with VALE and BAMIN, where she had the opportunity to develop activities in mining companies in phases of operation and green field projects.


In January  2021, Cecília  joined Piauí Níquel Metais (PNM) to lead the Human Resources department.
Benito Gioppo


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Benito has more than 25 years of experience in the areas of Administration, Infrastructure, Supplies, Contract Management and Operations with expertise in managing high performance teams, KPI’s and SLA’s management, budget and forecast, account control, preparation of WBS, administrative and operations management, full service facilities. Management of industrial relations, coordination of shared services (SSC), ISO 14001 certifications, among others.
Master’s student in Professional Administration, he also holds an Executive MBA in Marketing and a Bachelor of Business Administration, having worked in large, medium-sized multinational companies and family businesses, such as Vale, Anglo American, Elasa (Elo), Jones Lang LaSalle and GPA, among others, always in leadership positions.
Felipe Litwinski


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Felipe holds a graduate degree in finance from Fundação Dom Cabral, bachelor’s degree in Business Administration from FUMEC, was a part of the team on the turnaround and sale of Hospital Vera Cruz S/A to Hapvida (B3: HAPV3), worked as a partner at Acce Capital S/A where he acted as a financial adviser on over R$ 1 billion worth of M&A deals across various sectors (Health, Mining, Agriculture), worked as General Manager at Genesis Mining, taking the PA Gold project from PFS status to operational status and was part of the financial committee at the NZR Gold project.
Cesar Robiny


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Cesar holds a degree in Data Science from MIT School of Engineering, a bachelor degree in accounting from IBMEC (Instituto Brasileiro de Mercados de Capital), was part of the team on the turnaround and sale of Hospital Vera Cruz S/A to Hapvida (B3: HAPV3), as a partner at Acce Capital S/A worked in numerous M&A deals, more recently worked as Controller of Genesis Mining Holding Group, assisting with the funding and implementation of the PA Gold project, also acted as a member of the NZR Gold financial committee.
Iuri Oliveira


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Iuri is a professional with 25 years of experience in the Information Technology field, with 20 years in IT management, encompassing projects, resources, contracts, and processes (infrastructure, Service Desk, operations, telecommunications, database, and large-scale system implementation).


Specialized in cybersecurity and data governance from PUC-MG, with an MBA in project management. Career built in multinational companies in the cement industry (Lafarge Holcim) and gold mining (AngloGold Ashanti), with a strategic stint at Stefanini Corp, one of the world’s largest IT integrators.
Leticia Marota Ferreira


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Leticia has over 20 years of experience working in the legal departments of companies within the wholesale and pharmaceutical sectors. As a generalist, she assumes the role of a legal business partner, facilitating the integration of the legal department with other company functions and providing strategic legal support to ensure the attainment of business objectives.
Leticia holds a degree in Law from Fumec University and has pursued postgraduate studies in Business Law, Labor Law, and Tax Advocacy. In September 2023, she joined Piaui Niquel Metais to establish and lead the legal department.

Developing low cost nickel and cobalt production in Brazil