The unlined, 49 kilometre (km), 36/28-inch diameter copper tailings pipeline currently transports 62.3 mt/y of whole tailings from the thickener at the concentrator to Mauro Dam.
Operations also include a 120km, 7-inch diameter copper concentrate pipeline with throughput of 1.5 mt/y and a 60km, 32-inch diameter water reclaim pipeline with a flowrate of 3420 m3/h.
In 2001, tailings were being transported to Quillayes Dam, which was nearing capacity, via a 36-inch diameter, 39.5 mt/y pipeline. We were retained to evaluate the feasibility of delivering classified tailings (cyclone underflow) to two new dams, Quebrada Seca and Mauro.
Our scope of work initially included laboratory testing of the tailings, conceptual design and cost estimates. Based on this work, we were subsequently selected to perform basic engineering when Mauro Dam was selected as the new disposal site.
Our scope in the redirection project also included:
Our control systems group also designed the supervisory control and data acquisition (SCADA) and telecommunications systems for the entire project, including tailings distribution within the new Mauro Dam.
This phase was completed in 2003.
In 2008, we installed our proprietary Pipeline Advisor™ software package on the copper concentrate pipeline system for leak detection and operations optimisation. The following year we installed the Advisor on the tailings pipeline system as well.
In 2004, MLP began work to increase the system processing rate from 39.5 Mtpy (114 Kt/d) to the current 62.3 mt/y (179 Kt/d).
Our involvement in this phase of the project included:
The expansion was commissioned in 2010.
Pipeline integrity audit
In 2009, we continued our involvement with MLP when we were selected to perform a ground-breaking pipeline integrity audit — the first such audit to be performed on a tailings or concentrate pipeline system in Chile.
The audit included recommendations for updates which would optimise operations and minimise the pipeline’s impact on the community and environment.
Initially, our work included conceptual design and CAPEX for the recommended updates.
We were subsequently chosen to perform basic and detailed engineering for the pipeline system updates resulting from the study as well as technical inspections during construction.
We further added to our list of services provided to MLP with a debottlenecking study on the concentrate pipeline system, which was completed in 2011.
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