Featured project

Expansion of the nitric acid and ammonium nitrate plants in Mejillones (PANNA 4)

6 of April of 2026

Industrial Sector


Manufacturing and Chemistry

Client


ENAEX

Location


Mejillones, a city in northern Chile, 65 kilometers north of Antofagasta.

Date


2007-2008

Service Area


Consulting, Engineering, Procurement, and Construction Management.

Solutions


Review and validation of conceptual, basic, and detailed engineering; management of equipment and materials procurement; and technical assistance during the construction phase.

The project involved the expansion and modernization of the existing Prillex América Industrial Complex through the construction and operation of a new nitric acid and ammonium nitrate plant (PANNA), which increased nitric acid production and, consequently, raised ammonium nitrate production from 450,000 to 800,000 metric tons per year, according to the Environmental Impact Statement.

Pares&Alvarez developed the adaptation of the facilities outside the production area to provide the unit with the inputs, supplies, services, and raw materials required for its operation, in the quantities and conditions necessary for its functioning. The project required an investment of $230 million.

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