| Company | Bunker Hill Mining Corp. |
| Date | 2022-08-29 |
| Region | Coeur d’Alene Mining District, Shoshone County, Idaho |
| Commodities | Lead, Zinc, Silver |
| Mine Type | Underground |
| Throughput | 1,800 stpd |
| Status | Development |
Executive Summary
The Bunker Hill Mining Corp. (BHMC) Technical Report effective August 29, 2022, details the Pre-Feasibility Study for the restart of the historic Bunker Hill Mine located in the Coeur d’Alene Mining District, Idaho. The project aims to re-establish underground mining operations utilizing Long-Hole Open Stoping (LHOS) and Cut-and-Fill (CF) methods to access defined mineral resources. The report confirms sufficient mineral reserves to warrant the proposed 1,800 short tons per day (stpd) operation, with a focus on converting historical and newly delineated resources into Probable Mineral Reserves.
Metallurgical testing and process design indicate a flotation-based recovery circuit capable of producing marketable lead-silver and zinc concentrates. The proposed mill will process sulphide ore through primary and secondary crushing, ball milling, and differential flotation circuits. Tailings management involves thickening and filtration for use in an underground paste backfill system, minimizing surface waste storage. The economic analysis demonstrates strong viability at estimated metal prices, with risk analyses showing favorability under sensitivity scenarios.
Reports
Website: https://www.bunkerhillmining.com/
Report Date: 2022-08-29
Region: Coeur d’Alene Mining District, Shoshone County, Idaho
Project Status: Development
Commodity: Lead, Zinc, Silver
Throughput: 1,800 stpd
Mine Life:
Mine Type: Underground
Ore type:
Technical report and processing history
The following archived source profiles have been consolidated here to preserve the project’s processing history and study context.
Bunker Hill Mine — 2021 Technical Report
Bunker Hill Mine — 2021 Technical Report
| Company | Bunker Hill Mining Corp. |
| Date | 2021 |
| Region | Coeur d’Alene Mining District, Shoshone County, Idaho |
| Commodities | Silver, Lead, Zinc |
| Mine Type | Underground |
| Throughput | 1,500 tpd |
| Mine Life | 10 years |
| Status | Development |
Executive Summary
This NI 43-101 Technical Report, dated June 4, 2021, outlines the Preliminary Economic Assessment (PEA) and Mineral Resource update for the Bunker Hill Mine property in Idaho. Bunker Hill Mining Corp. (BNKR) is undertaking a brownfields redevelopment project to bring the historic underground mine back into production within the Coeur d’Alene Mining District. The report details the digitization of over 100 years of geological data, recent drilling programs, and the establishment of new Indicated and Inferred Mineral Resources for the UTZ, Newgard, and Quill deposits.
Historically, the mine produced over 161 million ounces of silver, 3.13 million tons of lead, and 1.31 million tons of zinc between 1887 and 1991. The property is currently classified as a Superfund site, with BNKR managing environmental liabilities under an EPA settlement agreement. The proposed mining plan utilizes underground methods such as cut-and-fill and long-hole open stoping, with a planned mine life of 10 years and a design throughput of 1,500 tons per day.
Metallurgical test work conducted by Resource Development Inc. (RDi) confirms that a sequential flotation process is viable for recovering marketable lead/silver and zinc concentrates. The conceptual flowsheet involves two-stage crushing, ball milling to 150 mesh, and rougher/cleaner flotation circuits. The report concludes that the current mineral resources warrant continued planning and development, supported by the company’s investment in exploration and infrastructure rehabilitation.
Website: https://www.bunkerhillmining.com/
Report Date: 2021
Region: Coeur d’Alene Mining District, Shoshone County, Idaho
Project Status: Development
Commodity: Silver, Lead, Zinc
Throughput: 1,500 tpd
Mine Life: 10 years
Mine Type: Underground
Ore type:
