Efﬁcient and Safe Irrigation in Secondary Leaching with Pexgol

Minas Argentinas Replaces HDPE with Pexgol in Its Secondary Leaching Project

Case Study Nº

181 Customer

Minas Argentinas S.A.

Argentina

2025

Working Conditions

Temperature: -10°C to +20°C / 14° to 68°F | Flow Rate: 50 l/h | Pressure: 2 to 4 bar | Fluid Components: Cyanide solution

Pexgol Pipes

Pexgol 110 mm, class 10

Application

Irrigation systems for secondary leaching pads

Lenght

200 m / 656 ft

The Challenge

Minas Argentinas S.A., operator of the Gualcamayo mine in San Juan, Argentina, needed to optimize the irrigation system for secondary leaching pads that transport cyanide solutions at temperatures between -10°C and +20°C, with operating pressures between 2 and 4 bar.

Previously, the system used 8” and 4” HDPE pipes, which presented several issues. Their rigidity made it necessary to use numerous elbows and ﬁttings to adapt the line from the crest to the slope of the pad. This not only increased system costs but also complicated installation and maintenance. Additionally, the weight of HDPE pipes required heavy machinery for handling, which was not feasible given the site’s limited space and access restrictions.

The Solution

The solution came with the installation of 200 meters of Pexgol 110 mm Class 10 pipe, which, thanks to its ﬂexibility, allowed the elimination of most of the elbows and ﬁttings required with HDPE. This feature made it possible to run the line from the crest to the bottom of the pad without structural modiﬁcations.

Pexgol’s lightweight design was also a decisive factor: the pipe was unrolled 1,000 meters away from the installation site and dragged into position using a backhoe, without the need for cranes or specialized equipment. The reduced space in the assembly area was no longer a limitation. The entire installation—including the connection to the main line, coupling to the pad, and attachment of irrigation hoses—was completed in just 8 hours.

Accessories such as electrofusion couplings, ﬂanged couplings, electrofusion tees, and PEX reducers were used to ensure secure and durable connections.

The incorporation of Pexgol not only solved the technical issues of the previous system but also signiﬁcantly reduced installation and operating costs, improving the safety and efﬁciency of the entire secondary leaching process.