Source: 1911 Gold Corporation (2026)
Website: https://www.1911gold.com/assets/true-north-complex/
Critical Data
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Throughput | tpd/tph | Not specified in Section 17 | |
| Mill Power | 1,250 HP (933 kW) | kW/MW | Primary ball mill drive |
| Target Grind Size | 67% passing 74 μm | μm/P80 | Tyler 200 mesh |
| Head Grade | 0.16 opt (5.5 g/t) | g/t/opt | Feed grade for nameplate recovery |
| Recovery % | 93.5% (up to 96.5%) | % | Grade-dependent; higher recoveries with higher grades |
| Processing Capacity | tpd/tph | Not specified in Section 17 | |
| Energy Consumption | kWh/t | Not provided | |
| Water Consumption | m³/t | Not provided | |
| Operating Hours | 12 | hours/day | 14 days on, 14 days off rotation; 4 crews |
Overview
The True North Project, operated by 1911 Gold Corporation in Manitoba, Canada, employs a fully integrated gold recovery process designed to achieve nameplate recoveries of 93.5% at a feed grade of 0.16 opt (5.5 g/t). The processing plant combines conventional crushing, grinding, flotation, thickening, cyanide leaching, carbon-in-pulp (CIP) adsorption, elution, and refining to produce gold doré. A Preliminary Economic Assessment (PEA) prepared by AMC Mining Consultants (Canada) Ltd. supports the current process design. The facility is configured to treat gold-bearing ore through a two-stage crushing circuit, a primary ball mill operating at 933 kW, a flotation section with OUTOTEC tank cells, and a six-stage CIP leach circuit. Gravity concentration using Knelson concentrators and a shaking table recovers coarse gold early in the process. The plant operates on a 14-day-on, 14-day-off schedule with 12-hour shifts, underscoring its remote but efficient operational model. This integrated flowsheet maximizes gold extraction while managing cyanide detoxification and water reuse, making the True North Project a technically robust operation.
Key Process Stages
- Stage 1: Crushing – A two-stage circuit using a primary jaw crusher and a secondary cone crusher reduces run-of-mine ore to a suitable size for grinding. The circuit is under development to optimize throughput and maintain consistent feed to the grinding circuit.
- Stage 2: Grinding & Gravity – Ore is ground in a 12½ ft by 14 ft (3.8 m x 4.3 m) primary ball mill powered by a 1,250 HP (933 kW) motor, achieving 67% passing 74 microns (Tyler 200 mesh). The mill operates in closed circuit with hydrocyclones; a portion of the underflow feeds two 20-inch FLSmidth Knelson gravity concentrators. Concentrate is upgraded on an 8 ft shaking table and direct smelted for gold doré, while tails return to the mill.
- Stage 3: Flotation – Cyclone overflow feeds two rows of 10 m³ OUTOTEC tank cells. Rougher and scavenger concentrates are combined and reground in an 8 ft by 6 ft (2.4 m x 1.8 m) regrind mill to 98% passing 37 microns (Tyler 400 mesh). A 12-inch Knelson concentrator treats a portion of the regrind mill feed. Collectors (Aerofloat 208, PAX) and frother (MIBC) are used to enhance gold recovery.
- Stage 4: Thickening & Cyanide Leaching – Flotation concentrate is thickened to 50% solids in a thickener with flocculant addition. The underflow enters a pre-leach tank then gravity-flows through a three-stage leach circuit (12 ft x 24 ft tanks) with oxygen injection. Dissolved gold is recovered in a six-stage CIP circuit using 12 ft x 14 ft (3.6 m x 4.3 m) vessels. Activated carbon moves countercurrent to slurry; loaded carbon is sent to elution.
- Stage 5: Elution & Refinery – Loaded carbon is acid-washed (rinsed) then eluted at 140°C in pressurized strip solution (0.2% NaCN, 2% NaOH) for 12 hours. Gold-rich solution passes through electrowinning cells. Barren carbon is recycled or regenerated. Gravity concentrate from the shaking table and electrowinning sludge are dried and smelted to produce gold doré bars.
Additional Interesting Data and Summary
The True North processing plant integrates gravity, flotation, and cyanide leaching to achieve high gold recoveries while managing environmental and operational constraints. Key technical data from Section 17 includes a flotation concentrate grading between 171 and 343 g/t Au (5–10 opt) and a regrind target of 98% passing 37 microns. The leach circuit uses a three-stage tank configuration with oxygen sparging, followed by a six-stage CIP adsorption system. Carbon is eluted at 140°C using a pressurized strip solution for 12 hours per batch; the elution column, heat exchangers, and immersion heater package operate in a closed loop with electrowinning cells. Past process analyses indicate feed is clean of deleterious elements (arsenic, mercury, antimony), though copper in solution was occasionally elevated. Cyanide detoxification in two tanks uses SMBS (sodium metabisulfite) and oxygen to destroy residual cyanide before tailings discharge to the pond. The refining circuit processes gravity concentrate daily and electrowinning sludge weekly, with gold sludge filtered and dried prior to smelting into doré bars. Water management is integrated: thickener overflow returns to the process water tank, and no water consumption metric is provided. The plant’s 14-day-on/14-day-off operating schedule with 12-hour shifts and four crews reflects a remote site labor model. Sustainability initiatives are not explicitly detailed, but the inclusion of cyanide detoxification and water recirculation highlights environmental consideration. The PEA, effective 10 February 2026, remains preliminary and includes Inferred Mineral Resources. The recovery methods outlined form the basis for future feasibility studies and potential expansion. Overall, the True North Project’s processing facility demonstrates a robust, multi-stage gold recovery flowsheet capable of adapting to varying feed grades while maintaining high metallurgical performance.
Key Processes: Flotation, CIP/CIL, Cyanidation, Gravity Separation, Ball Mill, Crushing
Target Commodities: Gold
Technical report and processing history
The following archived source profiles have been consolidated here to preserve the project’s processing history and study context.
1911 Gold True North PEA
1911 Gold True North PEA
| Company | 1911 Gold Corporation |
| Date | 2026 |
| Commodities | Gold |
Executive Summary
This Pre-Feasibility Study (PEA) outlines the recovery methods for the True North project. The processing plant design includes a two-stage crushing circuit with a primary jaw crusher and secondary cone crusher. Grinding is performed in a primary ball mill in closed circuit with hydrocyclones, with gravity concentration via Knelson concentrators for coarse gold.
The flotation circuit utilizes Outotec tank cells with PAX and MIBC reagents. The concentrate undergoes thickening and cyanide leaching in a three-stage circuit followed by a six-stage Carbon-in-Leach (CIP) circuit. Gold is recovered via elution and electrowinning in the refinery, with a nameplate recovery of 93.5%.
The process plant crews will operate on a 14-day-on, 14-day-off, 12 hours per day schedule utilizing four crews. Past processing analyses have shown that the process plant feed was clean, displaying no evidence of any deleterious constituents such as arsenic, mercury, or antimony that would otherwise affect gold recovery in the leach circuit.
Website: https://www.1911gold.com/assets/true-north-complex/
Report Date: 2026
Region:
Project Status:
Commodity: Gold
Throughput:
Mine Life:
Mine Type:
Ore type:
Technical Report for the True North Mine, Bissett, Manitoba, Canada
Technical Report for the True North Mine, Bissett, Manitoba, Canada
| Company | Havilah Mining Corporation |
| Mine | True North Mine |
| Date | 2018-05-08 |
| Region | Bissett, Manitoba, Canada |
| Commodities | Gold |
| Status | Development |
Executive Summary
This 2018 NI 43-101 Technical Report details the technical status of the True North Mine project in Bissett, Manitoba, owned by Havilah Mining Corporation. The report confirms the existence of an established underground mining infrastructure and a process plant capable of gold recovery through crushing, grinding, flotation, and carbon-in-pulp circuits. Qualified persons from Practical Mining LLC and EHA Engineering have certified the technical data and resource estimates.
Recommendations emphasize the need for detailed engineering studies to optimize mine plans and extraction methods, particularly regarding dilution estimates and cost analysis for backfill systems. The report also highlights the importance of tailings reprocessing to offset mine standby costs and suggests updating the mine closure plan. Continued exploration is recommended to target near-mine ore sources and regional land packages using the existing geological model.
Processing Profile
The process plant utilizes a three-stage crushing circuit including a jaw crusher, gyratory crusher, and VSI unit. Grinding is performed via ball mills, followed by flotation using OUTOTEC tank cells. Gold recovery involves a carbon-in-pulp circuit, with tailings reprocessing utilizing a carbon-in-leach circuit. The plant operates on a 14-day on, 14-day off schedule.
Reports
Website: https://www.1911gold.com/news/press-releases/havilah-mining-corporation-announces-grant-of-options
Report Date: 2018-05-08
Region: Bissett, Manitoba, Canada
Project Status: Development
Commodity: Gold
Throughput:
Mine Life:
Mine Type:
Ore type:
True North Mine — 2018 Technical Report
True North Mine — 2018 Technical Report
Company: Havilah Mining Corporation
Mine: True North Mine
Location: Bissett, Manitoba, Canada
Effective Date: March 31, 2018
Report Date: May 8, 2018
Executive Summary
This NI 43-101 Technical Report presents the findings for the True North Mine, located in Bissett, Manitoba, Canada. The True North Mine is an underground gold mining operation with a historical processing plant that has demonstrated effective mining and processing methods. The project encompasses a significant land package with 262 unpatented mining claims, 2 mineral leases, 18 patented mining claims, and 27 unpatented mining claims under a 50/50 joint venture with Greenbelt Gold Mines Inc.
The process plant utilizes a conventional gold recovery circuit consisting of primary jaw crushing, secondary gyratory crushing, and tertiary VSI crushing, followed by ball mill grinding to 67% passing 200 mesh. The grinding circuit includes gravity concentration with concentrators and a shaking table, with gravity concentrate being direct smelted. Flotation cells produce a rougher concentrate that is reground and subjected to three-stage leaching, followed by a six-stage carbon-in-pulp (CIP) circuit for gold recovery. The plant achieves a nominal recovery of 93.5% at a feed grade of 0.16 opt (5.5 g/t), with recovery reaching as high as 96.5% at higher feed grades. The process plant operates on a 14-day on, 14-day off, 12-hour per day schedule utilizing four crews.
The report includes recommendations for database management, QA/QC procedures, exploration programs focusing on regional target generation, and optimization of mining operations. A detailed engineering study and optimized mine plan are recommended to maximize project value.
Processing Details
Crushing Circuit
- Primary Crusher: 30-inch by 42-inch (760 mm by 1067 mm) jaw crusher
- Secondary Crusher: GP300 gyratory crusher
- Tertiary Crusher: Barmac B8000 VSI (vertical shaft impact) crusher
- Screening: 7-foot by 20-foot (2.1 m by 6.1 m) triple deck vibrating screen
Grinding Circuit
- Ball Mill: Allis Chalmers 12½-foot by 14-foot (3.8 m by 4.3 m), 1,250 HP (933 kW)
- Grind Size: 67% passing Tyler 200 mesh (74 microns)
- Gravity Concentration: Two 20-inch (500 mm) gravity concentrators
- Gravity Upgrade: 8-foot (2.4 m) shaking table (direct smelted)
Flotation Circuit
- Flotation Cells: Two rows of 10 m³ OUTOTEC tank cells
- Rougher Concentrate: 5-10 opt (171-343 g/t Au)
- Rougher Concentrate Regrind: 8-foot by 6-foot (2.4 m by 1.8 m) ball mill to 98% passing Tyler 400 mesh (37 microns)
Leaching and Recovery
- Leach Circuit: Three-stage leach in 12-foot by 24-foot (3.6 m by 7.2 m) tanks
- Gold Recovery: Six-stage carbon-in-pulp (CIP) circuit in 12-foot by 14-foot (3.6 m x 4.3 m) vessels
- Elution: Stainless-steel pressure strip vessel
- Electrowinning: Cell with stainless steel anodes and cathodes
- Smelting: Electric induction furnace
Tailings Reprocessing
- Flotation tails combined with trash screen undersize reporting to new pre-leach thickener
- Thickener underflow pumped to six CIL tanks for cyanide leaching
- CIP tails from flotation concentrate leach pumped to new CIL circuit
- Estimated to operate approximately six months per year
Key Recommendations
- Technical database administration and automation of QA/QC processes
- Sample storage and retrieval improvements
- Exploration programs targeting near-mine and regional opportunities
- Detailed engineering study and optimized mine plan
- Review and update of mine closure plan
Qualified Persons
- Sarah M Bull, P.E. (Practical Mining LLC) – Mining Engineering
- Mark A. Odell, P.E. (Practical Mining LLC) – Mining Engineering
- Laura M. Symmes, SME (Practical Mining LLC) – Geology
- Alfred S. Hayden, P.Eng. (EHA Engineering Ltd.) – Metallurgy
- David A. Orava, P.Eng. (P&E Mining Consultants Inc.) – Mining Engineering
Website: https://www.1911gold.com/assets/true-north-complex/
Report Date:
Region:
Project Status:
Commodity:
Throughput:
Mine Life:
Mine Type:
Ore type:
