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Key Staff



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

12 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, Senior Metallurgist

10 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.

Belenia Medina
, Metallurgist

Belenia is a chemical engineer and has a PhD in froth flotation. Specialist in development of conceptual engineering studies for manganese and copper.

Leslie Lopez
, 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.

Mayra Jefferson
, Metallurgist

Mayra is a chemical engineer with a masters in extractive metallurgy from the Western Australian School of Mines. Experience in base metal flotation, geometallury, simulation, design and testwork supervision in a range of metals.

Jose Salvador, 
Metallurgist

Jose is a metallurgical engineer. Experienced in process engineering and metallurgical testwork for leaching and flotation of copper, and flotation of other metals.
John Ramirez, Metallurgist

John is a metallurgical engineer that has worked in testwork laboratories and major copper flotation operations prior to joining Transmin.  Experienced in base metal metallurgy, comminution, simulation and barite beneficiation.

Javier Velasquez, Data Scientist

Javier studied scientific computing and has done research in machine learning. Javier supports Transmin's metallurgical team with the latest in machine learning and artificial intelligence.

Cristian Pazos
, Metallurgist

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
, Metallurgist

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