Superior Lake

Superior Lake Resources’ Superior Lake Zinc Project is located approximately 200km’s east of Thunder Bay in the province of Ontario, Canada. The Project covers 175km2 and consists of two deposits – Winston Lake and Pick Lake.

Primero were engaged in 2019 to execute the bankable feasibility study for re-development.

Feasibility Minerals

The Superior Lake process plant is designed to a nominal 44 tph of underground ore with high zinc grades and lower quantities of copper.

Scope of work

Primero completed a bankable feasibility study for re-development of the underground mine (by other consultants), process plant, site infrastructure and, licensing and permitting (by other consultants). All design elements were made suitable for cold climate. Historical test work and operating data were largely relied upon for process design. Historical power supply and building foundations were used as much as possible. Tight control over site water management and dust emission were included in the design to satisfy stake holder requirements.

Study deliverables were those suitable for a class 3 study:

Process Description

The Superior Lake process plant is designed to a nominal 44 tph of underground ore with high zinc grades and lower quantities of copper. The ore is crushed to P80 80mm via a primary crushing circuit and then conveyed to a SAG mill for milling to a target P80 75 µm. The copper circuit consists of rougher flotation, copper regrind circuit and two stages of cleaner flotation prior to dewatering via thickener and filter press. Zinc is recovered from the copper circuit tail via rougher-scavenger flotation, zinc regrind circuit and three stages of cleaner flotation prior to dewatering via thickener and filter press. Zinc and copper concentrates are each loaded into containers that are sealed prior to removal from the process plant building for dispatch. The tailings are thickened and pumped to the TSF or fed to the paste plant prior to being pumped underground. Water treatment is included for the zinc flotation process water and any water requiring discharge from the process plant.