Client name: Minera Kurri Kullu S.A., Minera IRL SA

Duration: 2009 - 2013 

Location: Ollachea, Puno Region, Peru

Coffey provided support for Mineral IRL’s successful listing on the Toronto Stock Exchange and successful completion of the pre-feasibility and subsequent feasibility studies on this project.  Our mine design and backfill solution allowed for an efficient low cost operations and reduced their environmental footprint, ensuring relations with the local community remained in good standing.  


In 2006, Minera IRL acquired 100% of the Ollachea Gold Project and the surface rights agreements were signed by the community of the Ollachea village in 2007.

Minera IRL had to list on the Toronto Stock Exchange and undertake a number of major studies to progress this project to mine development.

Minera IRL enjoys good relations with the local community and, as this project is located only 1.5km from the Ollachea village, the potential impact on the community was also a fundamental consideration.


Given the ground conditions and the need for a relatively low cost mine production method, we determined that the Long Hole Open Stoping mining method would be the most appropriate.

Whether longitudinal or transversal, this mining method would suit the orebody geometry and facilitate meeting the production target, particularly where the widths are greater than 5m.

Even though the ground conditions are considered poor, the selected small sub-level spacing would allow the installation of ground support that will provide good dilution control.

The selected mining method will allow mechanisation and provide an acceptable mix of selectivity, productivity and low cost whilst maintaining high ore recovery and controlled dilution.

To minimise the environmental impact of the project, we proposed using backfill to fill the stope voids in order to reduce the surface disposal of both tailings and waste rock.


Mineral IRL successfully obtained their listing on the Canadian Toronto Stock Exchange in 2010.

The company was able to raise the required funds that enabled them to advance further exploration on the project and complete the pre-feasibility and subsequent feasibility studies on the project.  

These were important steps toward full mine development.