Key Staff

Transmin has the team to support any project: testwork, design, and operations

Adam Johnston

Chief Metallurgist

Fellow AusIMM

Chartered Professional (Metallurgy)   

Over 25 years experience in extractive metallurgy. Worked on testing, design, construction, commissioning, and operation of a wide variety of processes on six continents.

Luis Miguel La Torre

Principal Metallurgist

15+ years experience in extractive metallurgy.

Lead major improvements in metallurgy and throughput on several operations in South and Central America.  Expert in comminution design.

Cesar Fuentes

Principal Metallurgist

15+ years experience in extractive metallurgy worked on several major testwork programs for copper, gold and silver projects. 

Leads simulation software sales, gas dispertion studies training and consulting for Transmin.

Leslie Lopez

Senior Geometallurgist

Leslie is a chemical engineer with a masters in extractive metallurgy. Experience in copper flotation, copper leaching, and iron ore befeficiation.

Expertise in geometallurgical modeling.

Loida Peña

Senior Metallurgist 

Loida is a metallurgical engineer that has broad experience in flotation development, operations, and geometallurgy.

Cristian Pazos


Cristian is a metallurgical engineer that has worked in testwork laboratories, phosphate concentration operations and polymetallic flotation operations. He has experience in material balance audits, comminution simulation and process optimization.

Giovana Paz


Giovana is a metallurgical engineer, has experience in the preparation of engineering documents and advanced data processing and analysis.

Diego Mendoza 


Diego is a chemical engineer that has expertise in geochemistry at laboratory and plant level.

He also has experience in data analysis and process optimization.

Belenia Medina


Belenia has more than 14 years´ experience developing engineering studies for manganese, barite, copper and polymetallic ores; also has experience developing testwork design and supervision, data analysis and processing, preparation of engineering documents, and geometallurgy.

PhD and MSc. in Metallurgical Engineering at Pontifical Catholic University of Rio de Janeiro-Brazil, Chemical Engineer at San Agustin University (Peru).