The Estevan Mine covers an area of 20,331 Ha. and is located in South Eastern Saskatchewan between the City of Estevan and the Town of Bienfait. The Estevan Mine operates four active pits and supplies lignite coal to the Boundary Dam Generating Station (4 Units), the Shand Generating Station (1 Units), the Activated Carbon Plant, the Char Plant, as well as some Domestic Sales.  The Generating Stations are owned and operated by Saskatchewan Power Corporation.

Coal is uncovered using the six draglines (1 – BE 2570W, 1 – BE 1570W, 1 – P&H1920, 1 – Marion 8750, 1 – P&H 2355).  The exposed coal is hauled from the pits directly to the generating station.  Current annual production of the mine is 6.0 million tonnes.  The current coal supply contracts to the Generating Stations for the Mines expire in 2024.

The Estevan mine combines the Bienfait mine and the adjacent Boundary Dam mine.

The Boundary Dam Mine is an approved coal mine located in southeastern Saskatchewan, approximately 10 km south of the City of Estevan.

The mining method that employed is open pit strip mining. The sequence begins with the soils salvage in advance of mining. The overburden is then removed to expose the underlying coal seams and placed in the adjacent pit. The coal is removed and the subsequent open pit is backfilled with the overburden from the next open cut. Spoil piles are then recontoured and the salvaged cover soils are replaced on the recontoured spoil piles and revegetated to predetermined end land use.

The Bienfait Mine is located in southeastern Saskatchewan, approximately 3 km southeast of the Town of Bienfait.

Mining has been ongoing in the Bienfait area for over 100 years. PMRL employs over in 2018 over 350 workers in the Estevan area, and to date have delivered over 250 million tonnes of coal to the market place (domestic and local). This has had a significant long term positive effect on the local and provincial economy.

Coal is loaded in pit by front end loaders. Coal is hauled out of pit by 150-tonne trucks along the haul road.

The mining method that is employed is open pit strip mining. The sequence begins with the soils salvage in advance of mining. The overburden is then removed to expose the underlying coal seams and placed in the adjacent pit. The coal is removed and the subsequent open pit is backfilled with the overburden from the next open cut. Spoil piles are then recontoured and the salvaged cover soils are replaced on the recontoured spoil piles and revegetated to predetermined end land use.

The strip mining sequence:
1. Before mining begins all suitable soils are salvaged and hauled to areas undergoing reclamation or retained in stockpiles for future use.
2. The dragline removes the overburden to expose the coal seam. The overburden is placed in the adjacent mined-out cut. The coal seam is uncovered.
3. Coal is loaded into large-capacity trucks for transport to the power station.
4. Bulldozers re-contour the overburden removed by the dragline. This step is the first stage in land reclamation.
5. Soils salvaged prior to mining is replaced on the re-contoured overburden.
6. The land is re-vegetated and returned to agriculture production or other acceptable land use as defined in the operating approvals.