The HM claim is part of the Macassa mine complex located in Kirkland Lake, Ontario. The Kirkland Lake mining camp has been a prolific gold producer since mining began there in 1915. Gold mineralization at Macassa is found along breaks or faults, in veins as quartz filled fractures, as sulphide rich pyrite zones and as breccias.
The HM claim is an area that hosts the easterly extension of the South Mine Complex (SMC) and is located southeast of the #2 shaft at the Macassa mine. The exploration results from the SMC and HM Claim have identified a significant new find as some of the veins have larger widths and higher grades than the Macassa main zones. Kirkland Lake Gold is developing a new 4,000 tpd shaft that will support higher levels of production and enable more effective underground exploration east of the SMC. A mid-shaft loading station at approximately 1,650 metres in depth is expected to be completed by 2022.
Mining at Macassa is conducted primarily with overhand and underhand cut-and-fill methods. The Macassa mill was constructed in 1986, originally designed for throughput of 725 tpd but has been upgraded to handle 2,000 tpd. Ore processing at Macassa starts with crushing and grinding before it enters leach tanks for cyanidation and then flows through a carbon-in-pulp circuit, followed by a Merrill- Crow recovery system. The concentrate is melted in a furnace where doré is poured that typically contains 85% to 88% gold.
Kirkland Lake Gold and Agnico Eagle Mines announced they have entered into an agreement to combine in a merger of equals under the name “Agnico Eagle Mines Limited”. The merger is expected to close at the end of 2021 or early in 2022.
Kirkland reported that work on the #4 Shaft project is ahead of schedule and remains on target for completion in late 2022.
An updated NI 43-101 Technical Report was filed for Macassa. The report estimates that phase one of the #4 Shaft project will be completed during the second quarter of 2022 and phase two at the end of 2023. The shaft will support higher levels of production and enable more effective underground exploration to the east of the South Mine Complex where the HM Claim is located.