Portsmouth Mine is a former iron mine located within the Cuyuna Country Mine Lakes. This freshwater site features artificial reef structures and underwater wall topography. Divers and snorkellers can expect visibility ranging from 10 to 15 metres. The site offers a wide depth range, extending from 1 metre down to 140 metres. Shore access is available, including a swimming beach on the northwest shore that leads to underwater rock shelves. Facilities at the site include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, guided tours, and boat charter services. The site is suitable for beginners, though users should be aware of the significant depth.

Crosby Mine Pit is a flooded open-pit mine serving as an artificial reef within the Cuyuna Country Mine Lakes. Divers access the water via a shore entry. The site features a significant depth range from 3 to 61 metres, with an average depth of 30 metres. Visibility fluctuates between 5 and 24 metres, influenced by thermoclines that cause sharp temperature drops during descent. While the lack of current suits beginners, the deep sections require advanced certification and careful decompression planning. Hazards include cold water, entanglement risks, and overhead environments. On-site facilities provide air fills, equipment rental, and guided tours to assist with orientation.

Huntington Mine Lake is a flooded mine site within the Cuyuna Country Mine Lakes, offering a unique freshwater environment for divers and snorkellers. The site is notable for its preserved underwater forest, where trees remain standing, and old railroad tracks visible on the lake floor. Depths range from 3 to 79 metres, with visibility typically between 9 and 15 metres. Shore access is available, and the site includes parking facilities. Due to the significant depth and potential for entanglement within the submerged forest, this site is suited for intermediate divers. Water temperatures vary significantly throughout the year, ranging from 2°C to 11°C.

Louise Mine Pitt is a shore-accessible freshwater site featuring an artificial reef and wall structure. Divers can explore depths ranging from 2 to 36 metres, with an average depth of 25 metres. Visibility typically spans 5 to 15 metres, though thermoclines can affect clarity and temperature at depth. The site is suitable for intermediate divers, as the deep profile requires careful buoyancy control and awareness of entanglement risks within the artificial structures. Cold water is a constant factor, necessitating appropriate thermal protection year-round. An on-site dive shop provides air fills and equipment rental to support divers.

Yawkey Mine Lake is a sheltered freshwater site within the Cuyuna Country Mine Lakes. The topography features submerged mine roads and vertical rock walls that drop off from the shoreline. As an artificial reef site, it offers a unique underwater landscape for snorkellers and divers. The site is accessible via shore entry and provides facilities including parking, toilets, showers, changing rooms, and a rinse station. Due to the nature of the environment, visitors should be aware of hazards including cold water, significant depths, and potential entanglement. A typical dive session lasts approximately 45 minutes.