A PFS-level technical report describes a conventional copper-molybdenum flotation plant for the Berg Copper Project in British Columbia, with a design throughput of 120,000 t/d and a two-stage crushing, SAG-ball mill grinding, and bulk flotation flowsheet.
The Berg Copper Project is located in the Tahtsa Ranges of British Columbia, Canada, within the Hazelton Mountains. Surge Copper Corp. owns a 100% interest in the property, acquired through a purchase agreement completed in January 2024 with Thompson Creek Metals Company Inc., a wholly owned subsidiary of Centerra Gold Inc. The project is at the pre-feasibility stage, with a technical report dated July 28, 2026, prepared by Ausenco Engineering Canada ULC and Ausenco Sustainability ULC. The project targets copper and molybdenum mineralization from both supergene and hypogene materials. Open-pit mining operations are planned to commence three years prior to mill start-up, and the development timeline is described in the context of a 2026 PFS.
Critical Data
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Annual throughput | 43.8 | Mt/a | Design value |
| Daily throughput | 120 | kt/d | Design value |
| ROM head grade, copper | 0.33 | % Cu | Design value |
| ROM head grade, molybdenum | 0.034 | % Mo | Design value |
| Crushing availability | 75 | % | Design value |
| Grinding and flotation availability | 92 | % | Design value |
| Concentrate filtration availability | 85 | % | Design value |
| Crushing plant capacity | 7,667 | t/h | Design value, dry basis |
| ROM feed size, F100 | 1,000 | mm | Design value |
| Bond crushing work index | 19.1 | kWh/t | Design value |
| Primary crushing product size, P80 | 529 | mm | Design value |
| Secondary crushing feed size, F100 | 425 | mm | Design value |
| Secondary crushing product size, P80 | 166 | mm | Design value |
| Grinding plant capacity | 5,435 | t/h | Design value, dry basis |
| JK Drop Weight Axb value | 26.2 | Not applicable | Design value |
| Bond rod mill work index | 23.9 | kWh/t | Design value |
| Bond ball mill work index | 17.7 | kWh/t | Design value |
| Bond abrasion index | 0.16 | g | Design value |
| Grinding circuit feed size, F80 | 50 | mm | Design value |
| Grinding circuit product size, P80 | 160 | µm | Design value |
| SAG Mill specific energy | 9.6 | kWh/t | Design value |
| Ball Mill specific energy | 10.0 | kWh/t | Design value |
| Cu-Mo rougher residence time | 20 | min | Design value |
| Pyrite scavenger residence time | 12.5 | min | Design value |
| Cu-Mo primary regrind product size, P80 | 40 | µm | Design value |
| Cu-Mo secondary regrind product size, P80 | 20 | µm | Design value |
| Molybdenum rougher residence time | 17.5 | min | Design value |
| Molybdenum rougher scavenger residence time | 15 | min | Design value |
| Final copper concentrate moisture | 8 | % w/w | Design value |
| Final copper concentrate grade | 30 | % Cu | Design value |
| Final molybdenum concentrate moisture | 5 | % w/w | Design value |
| Final molybdenum concentrate grade | 50 | % Mo | Design value |
| Total installed power | 237,179 | kW | Plant total |
| Total power consumption | 1,380,825 | MWh/a | Plant total |
| Fresh water requirement | 2.06 | Mm³/a | From Nanika Lake |
| Process water circulation | 115.51 | Mm³/a | Equivalent to 13,186 m³/h |
Overview
The recovery methods section describes a conventional copper-molybdenum flotation process selected based on analysis of past metallurgical testing and process design expertise. The flowsheet uses standard processes and technologies typical for copper-molybdenum recovery. The process beneficiates copper and molybdenum from both supergene and hypogene materials at a nominal throughput of 120,000 t/d or 43.8 Mt/a. Bulk rougher flotation is conducted at a feed sizing of 80% passing 160 µm.
The process design comprises several main circuits. Two-stage crushing of run-of-mine material feeds a crushed ore covered longitudinal stockpile that provides buffer capacity ahead of the grinding circuit. SAG milling with trommel screen and pebble recycle is followed by ball milling with cyclone classification. Copper and molybdenum bulk flotation uses coarse and fine regrinding prior to cleaner flotation. A copper-molybdenum separation flotation step follows. Copper concentrate handling includes thickening, filtration, and loading, while molybdenum concentrate handling includes thickening, filtration, drying, and loading. Tailings are pumped and disposed to a tailings management facility.
Key Process Stages
Primary crushing occurs near the pit boundary limits. Run-of-mine material is dumped by haul truck into the primary crusher dump pocket that feeds the primary gyratory crusher. The crushing circuit is designed for 6,570 operating hours per year at 75% availability and is sized for a maximum throughput of 7,667 t/h from the outset of the project. Primary crushed material moves through a discharge vault onto an apron feeder, then to a sacrificial discharge conveyor. Three overland conveyors transfer material to the secondary screen crusher surge bin. Secondary screen feeders draw from the surge bin to feed two secondary screens, splitting oversized material among three secondary cone crushers. Screen undersize and secondary crushed material discharge onto the stockpile feed conveyor that transfers crushed ore to the covered stockpile. A tripper conveyor distributes crushed material across the stockpile. Three lines, each comprising two reclaim feeders, draw from the stockpile to feed each SAG mill feed conveyor. The stockpile has a 12-hour live capacity of 65,217 t.
The grinding circuit has three operating lines. Each line consists of a SAG mill feed conveyor, a SAG mill, and a ball mill in closed circuit with hydrocyclones. The circuit is sized based on a SAG mill feed size of 80% passing 50 mm and a ball mill product of 80% passing 160 µm. Each SAG mill discharges through a trommel screen where oversize pebbles are recycled to the SAG mill via a pebble recycle conveyor. Trommel screen undersize discharges into the primary cyclone feed pump box. Water is added to the cyclone feed pump box to maintain appropriate feed density. Primary cyclone underflow reports to the ball mill feed box along with sodium cyanide, lime, diesel, and collector. Each ball mill discharges through a trommel with oversize screened out and transferred to a scats bunker. Primary cyclone overflow reports to a trash screen before advancing to the bulk copper-molybdenum flotation circuit.
The bulk copper-molybdenum flotation circuit has three operating lines consisting of rougher flotation cells, pyrite scavenger cells, a coarse concentrate regrind circuit, a fine concentrate regrind circuit, three-stage copper-moly cleaner flotation cells, and copper-moly scavenger flotation cells. Overflow from the primary cyclone cluster reports to the rougher cell feed box along with frother. Process water and low-pressure flotation air are added to each cell to maintain pulp density and initiate bubble formation. Rougher concentrate is collected from each cell and pumped to coarse regrinding, while tailings proceed to the pyrite scavenger flotation circuit. Collector is added to the first pyrite scavenger cell in each operating line. Rougher tailings are scavenged in the pyrite flotation circuit to separate higher-grade sulphur bearing material for deposition in a separate section of the tailings storage facility. Rougher concentrate reports to the coarse regrind mill cyclone feed pump box, with cyclone underflow feeding the coarse regrind ball mill. Reground material returns to the cyclone feed pump box, and cyclone overflow reports to the first copper-moly cleaner flotation cells. First cleaner tails report to the cleaner scavenger stage. Concentrate from the first cleaner and scavenger stages reports to the fine regrind circuit prior to the second and third cleaner stages. Third cleaner concentrate reports to the elevated copper-moly concentrate thickener. Cleaner scavenger tailings join pyrite rougher concentrate for separate tailings disposal.
The molybdenum flotation circuit consists of a conditioning tank, rougher flotation, scavenger flotation, two cleaner stages, and one cleaner scavenger stage. Copper-moly concentrate thickener underflow is pumped to the molybdenum rougher conditioning tank where sodium hydrosulphide is added. A nitrogen gas generation plant provides flotation gas for the copper-moly flotation circuit. Rougher concentrate goes to the first molybdenum cleaner cells, and rougher tailings advance to rougher scavenger cells. Rougher scavenger concentrate is recirculated to the rougher conditioning tank, with tailings reporting to the copper concentrate thickener. First cleaner tails report to the cleaner scavenger stage. Cleaner scavenger concentrate returns to the first cleaner stage, and cleaner scavenger tailings return to the rougher conditioning tank. First cleaner concentrate reports to the second cleaner stage. Second cleaner concentrate reports to the molybdenum concentrate thickener, and second cleaner tailings recirculate to the first cleaner feed.
Copper concentrate is thickened to 60% w/w solids in the high-rate copper concentrate thickener. Thickener overflow reports to the process water tank. Underflow is pumped to the copper filter feed tank where slurry passes through a concentrate filter producing filter cake at 8% w/w moisture. Filtrate returns to the copper concentrate thickener. Filter cake discharges to a covered concentrate loadout stockpile. A front-end loader reclaims copper concentrate and loads it into containerized highway haulage trucks.
Molybdenum concentrate is thickened to 60% w/w solids in the high-rate molybdenum concentrate thickener. Underflow is pumped to the molybdenum filter feed tank where slurry passes through a concentrate filter producing filter cake at less than 15% w/w moisture. Filter cake reports to the molybdenum concentrate dryer, reducing moisture to 5% w/w. Dried concentrate reports to a storage bin, then to a packing system where it is bagged and transported by truck.
Tailings from each train of pyrite scavenger flotation cells report to separate tailings collection boxes. Sulphur depleted tailings are pumped to designated tailings primary cyclone clusters. Primary cyclone overflow is sent directly to the tailings management facility. Underflow is pumped to tailings secondary mobile cyclone clusters. Secondary cyclone overflow goes to the tailings management facility, while cyclone underflow sand is used on the south dam for dam growth and reinforcement. Pyrite scavenger concentrates and cleaner scavenger tails report to a high pyrite tailings pump box with dedicated pumps delivering high sulphur tailings to a separate location at the tailings management facility.
Additional Interesting Data and Summary
Reagents used in the process plant include lime as a pH modifier, potassium amyl xanthate as a collector, methyl isobutyl carbinol as a frother, fuel oil as a molybdenum collector, sodium cyanide as a sulphide depressant, sulphuric acid for copper-molybdenum conditioning, sodium hydrosulphide as a copper depressant, and BASF Magnaflocc 1011 as a flocculant. Each reagent has specific preparation and delivery methods, with compatible reagent systems located within containment areas.
Plant air compressors supply air at 860 kPa to various processing plant equipment. Dedicated air compressors serve the concentrate filter, and blowers serve the flotation cells. A vendor-supplied nitrogen plant is expected to provide flotation gas to the molybdenum circuit.
Fresh water is supplied by Nanika Lake to a fresh and fire water tank. This water is used for gland water for pumps, reagent make-up, and fire water for the sprinkler and hydrant system. Total estimated raw water use from the lake is 2.06 Mm³ per year.
Process water supply consists of recycled overflow streams from the bulk and concentrate thickeners, concentrate filters, and reclaim from the tailings management facility. Process water is used for cooling mill motors and lubrication systems, pulp density control, dewatering flocculant in-line mixing and spray water, and dilution and froth water in the molybdenum circuit. Total process water circulation is 115.51 Mm³ per year, or 13,186 m³ per hour.
Fire water is sourced from the fresh and fire water tank. A pump skid with a dedicated electrical pump, a jockey pump, and a diesel-powered pump supplies emergency fire water distribution to the plant.
Key Processes
- Two-stage crushing of ROM material through a primary gyratory crusher and three secondary cone crushers
- SAG milling with trommel screen and pebble recycle, followed by ball milling with cyclone classification
- Bulk copper-molybdenum flotation with coarse and fine regrinding prior to cleaner flotation
- Copper-molybdenum separation flotation using sodium hydrosulphide and nitrogen gas
- Copper concentrate thickening, filtration, and containerized loadout
- Molybdenum concentrate thickening, filtration, drying, bagging, and truck transport
- Tailings classification with cyclone underflow sand used for dam construction and high sulphur tailings directed to a separate disposal area
Source: Berg Copper Project NI 43-101 Technical Report and Pre-Feasibility Study, July 28, 2026. Project website: Berg Copper Project
Technical report and processing history
The following archived source profiles have been consolidated here to preserve the project’s processing history and study context.
Berg Copper Project: Conventional Cu-Mo Flotation at 43.8 Mt/a
The Berg Copper Project, owned by Surge Copper Corp., is a pre-feasibility stage copper-molybdenum project located in the Tahtsa Ranges of British Columbia, Canada. Open-pit operations are planned to commence three years prior to mill start-up, with milling running for 28 years following start-up.
Critical Data
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Feed rate, nominal | 43.8 | Mt/a | Design value |
| Feed rate, daily | 120,000 | t/d | Design value |
| Crushing circuit type | 2C-SAB | Not applicable | Two-stage crushing with SAG and ball mills |
| Grinding circuit lines | 3 | Not applicable | Operating lines |
| ROM head grade, copper (design) | 0.33 | % Cu | Design value |
| ROM head grade, molybdenum (design) | 0.034 | % Mo | Design value |
| Bulk rougher flotation feed sizing | 160 | µm | P80, design value |
| Crushing availability | 75 | % | Design value |
| Grinding and flotation availability | 92 | % | Design value |
| Concentrate filtration availability | 85 | % | Design value |
| SAG mill specific energy | 9.6 | kWh/t | Design value |
| Ball mill specific energy | 10.0 | kWh/t | Design value |
| Final copper concentrate grade | 30 | % Cu | Design value |
| Final copper concentrate moisture | 8 | % w/w | Design value |
| Final molybdenum concentrate grade | 50 | % Mo | Design value |
| Final molybdenum concentrate moisture | 5 | % w/w | Design value |
| Fresh water consumption | 2.06 | Mm³/a | Estimated value |
| Process water circulation | 115.51 | Mm³/a | Estimated value |
| Total installed power | 237,179 | kW | Design value |
| Total annual power consumption | 1,380,825 | MWh/a | Estimated value |
| ROM feed size, F100 | 1,000 | mm | Design value |
| Bond crushing work index (design) | 19.1 | kWh/t | Design value |
| Bond ball mill work index (design) | 17.7 | kWh/t | Design value |
| Bond rod mill work index (design) | 23.9 | kWh/t | Design value |
| Bond abrasion index (design) | 0.16 | g | Design value |
| JK Drop Weight Axb value (design) | 26.2 | Not applicable | Design value |
Overview
The Berg Copper Project uses a conventional copper-molybdenum flotation process. Ausenco Engineering Canada ULC selected this approach following analysis of past metallurgical testing and process design work. The unit operations are standard for copper-molybdenum recovery. The flowsheet uses commercially available technologies.
The process recovers copper and molybdenum from supergene and hypogene materials. Nominal throughput is 120,000 t/d, or 43.8 Mt/a. Bulk rougher flotation runs at a feed sizing of 80% passing 160 µm.
The process design includes two-stage crushing of run-of-mine material, a crushed ore covered longitudinal stockpile, SAG milling with trommel screen and pebble recycle followed by ball milling with cyclone classification, copper and molybdenum bulk flotation with coarse and fine regrinding, copper-molybdenum separation flotation, concentrate thickening and filtration, and tailings pumping to a tailings management facility.
Key Process Stages
Crushing Circuit
Primary crushing sits near the pit boundary. Haul trucks dump ROM material into the primary crusher dump pocket feeding a primary gyratory crusher. The circuit runs 6,570 h per year at 75% availability. Maximum throughput from the outset is 7,667 t/h.
ROM feed enters at F100 of 1,000 mm. Primary crushing reduces material from F80 of 529 mm to P80 of 153 mm. Crushed material moves through a discharge vault onto an apron feeder, then onto a sacrificial discharge conveyor. Three overland conveyors carry material to the secondary screen crusher surge bin.
Secondary screen feeders draw material to two double-deck secondary screens. Oversize splits among three secondary cone crushers at 630 kW each. Screen undersize and secondary crushed material feed to the covered stockpile via a tripper conveyor. The stockpile holds a 12-hour live capacity of 65,217 t. Six reclaim feeders, 914 mm belt width each, draw from the stockpile.
Major equipment includes a rock breaker, the primary gyratory crusher at 1,200 kW, a primary crusher discharge apron feeder at 3,048 mm pan width, the secondary screens, the three secondary cone crushers, a crushed ore stockpile feed overland conveyor at 1,800 mm belt width over three sections totaling 5.2 km, and the six reclaim feeders.
Grinding Circuit
Three operating lines each consist of a SAG mill feed conveyor, a SAG mill, and a ball mill in closed circuit with hydrocyclones. SAG mill feed is F80 of 50 mm. Ball mill product target is P80 of 160 µm.
Each SAG mill discharges through a trommel screen. Oversize pebbles recycle to the SAG mill via a pebble recycle conveyor. Trommel undersize goes to the primary cyclone feed pump box. Water maintains appropriate feed density before pumping to cyclones.
Primary cyclone underflow reports to the ball mill feed box along with sodium cyanide, lime, diesel, and collector. Each ball mill discharges through a trommel. Oversize goes to a scats bunker. Trommel undersize returns to the cyclone feed pump box. Cyclone overflow passes through a trash screen before advancing to bulk flotation.
Major equipment includes three SAG mill feed conveyors at 1,800 mm belt width and 215 m each, three SAG mills at 20 MW each, three ball mills at 20 MW each, and three primary cyclone clusters with ten operating and two standby cyclones each.
Bulk Copper-Molybdenum Flotation
Three operating lines include rougher flotation cells, pyrite scavenger cells, coarse concentrate regrind, fine concentrate regrind, three-stage copper-moly cleaner flotation, and copper-moly scavenger flotation.
Cyclone overflow feeds the rougher cell with frother. Process water and low-pressure flotation air maintain pulp density and bubble formation. Rougher concentrate pumps to coarse regrinding. Tails go to the pyrite scavenger circuit. Collector is added to the first pyrite scavenger cell in each line. Pyrite flotation separates higher-grade sulphur material for deposition in a separate section of the tailings storage facility.
Rougher concentrate reports to the coarse regrind mill cyclone feed. Cyclone underflow feeds a coarse regrind ball mill. Reground material returns to the cyclone feed. Cyclone overflow reports to the first copper-moly cleaner cells. First cleaner tails go to the cleaner scavenger stage. First cleaner and scavenger concentrates go to fine regrinding before the second and third cleaner stages. Third cleaner concentrate reports to the copper-moly concentrate thickener. Cleaner scavenger tails join pyrite rougher concentrate for separate disposal.
Major equipment includes three trains of four rougher tank cells each, three trains of two pyrite scavenger tank cells each, a coarse concentrate regrind mill at 14.5 MW, four first cleaner tank cells, two cleaner scavenger tank cells, a fine concentrate regrind mill at 3 MW, three second cleaner tank cells, two third cleaner tank cells, and a copper-moly concentrate thickener.
Molybdenum Flotation
The circuit includes a conditioning tank, rougher flotation, scavenger flotation, two cleaner stages, and one cleaner scavenger stage.
Copper-moly concentrate thickener underflow pumps to the rougher conditioning tank where NaHS is added. After conditioning, material pumps to rougher flotation. A nitrogen gas generation plant provides flotation gas. Rougher concentrate goes to the first cleaner cells. Rougher tails advance to rougher scavenger. Scavenger concentrate recirculates to the conditioning tank. Scavenger tails report to the copper concentrate thickener.
First cleaner tails go to the cleaner scavenger stage. Cleaner scavenger concentrate returns to the first cleaner. Cleaner scavenger tails return to the rougher conditioning tank. First cleaner concentrate reports to the second cleaner stage. Second cleaner concentrate goes to the molybdenum concentrate thickener. Second cleaner tails recirculate to the first cleaner feed.
Major equipment includes three rougher tank cells, two rougher scavenger tank cells, three first cleaner tank cells, one cleaner scavenger tank cell, and one second cleaner pneumatic cell.
Copper Concentrate Handling
Copper concentrate thickens to 60% w/w solids in a high-rate thickener. Overflow reports to the process water tank. Underflow pumps to the filter feed tank. The concentrate filter produces a cake at 8% w/w moisture. Filtrate returns to the thickener. Filter cake discharges to a covered loadout stockpile. A front-end loader reclaims the concentrate into containerized highway haulage trucks.
Major equipment includes the copper concentrate thickener and the copper concentrate filter.
Molybdenum Concentrate Handling
Molybdenum concentrate thickens to 60% w/w solids in a high-rate thickener. Overflow reports to the process water tank. Underflow pumps to the filter feed tank. The concentrate filter produces a cake below 15% w/w moisture. Filtrate returns to the thickener. Filter cake goes to a dryer reducing moisture to 5% w/w. Dried material reports to a storage bin. Concentrate is withdrawn into a packing system, bagged, and trucked.
Major equipment includes the molybdenum concentrate thickener, filter, and dryer.
Tailings Handling
Tailings from each pyrite scavenger train report to separate collection boxes. Sulphur-depleted tailings pump to designated primary cyclone clusters. Primary cyclone overflow goes directly to the tailings management facility. Underflow pumps to secondary mobile cyclone clusters. Secondary cyclone overflow goes to the tailings management facility. Cyclone underflow sand is used on the south dam for dam growth and reinforcement.
Pyrite scavenger concentrates and cleaner scavenger tails report to a high pyrite pump box. Dedicated pumps deliver high-sulphur tailings to a separate location at the tailings management facility.
Major equipment includes three primary cyclone clusters with seven operating and one standby cyclone each, and three secondary mobile cyclone clusters with eight operating and two standby cyclones each.
Reagents Handling
Reagent systems sit within containment areas to prevent spillage and unintended mixing. Storage tanks have level indicators, instrumentation, and alarms. Ventilation, fire protection, eyewash stations, and Safety Data Sheets are provided. Sumps and sump pumps control spills.
Lime arrives as powdered quicklime, stores in a silo, slakes, and doses as slurry for pH modification. Potassium amyl xanthate arrives in bulk bags, dilutes to 20% w/w, and doses as collector. MIBC arrives as bulk liquid and doses neat as frother. Diesel arrives as bulk liquid and doses as molybdenum collector. Sodium cyanide arrives in bulk bags, dilutes to 30% w/w, and doses into primary grind and regrind as sulphide depressant. Sulphuric acid arrives in intermediate bulk containers for copper-molybdenum conditioning. Sodium hydrosulphide arrives at 40% w/w, dilutes to 20% w/w, and doses as copper depressant. BASF Magnaflocc 1011 arrives in bulk bags, dilutes to 0.05% w/w, and doses to each thickener as flocculant.
Water and Air Systems
Fresh water from Nanika Lake supplies a fresh and fire water tank. Uses include gland water for pumps, reagent make-up, and fire water in sprinkler and hydrant systems. Estimated raw water use is 2.06 Mm³ per year.
Process water comes from recycled overflow streams from thickeners, concentrate filters, and reclaim from the tailings management facility. Uses include cooling for mill motors and lubrication, pulp density control, flocculant mixing, and dilution and froth water in the molybdenum circuit. Total process water circulation is 115.51 Mm³ per year, or 13,186 m³/h.
Fire water comes from the fresh and fire water tank. A pump skid with a dedicated electrical pump, a jockey pump, and a diesel-powered pump supplies emergency distribution.
Plant air compressors supply air at 860 kPa. An air dryer removes moisture before instrumentation use. Dedicated compressors serve the concentrate filter. Blowers serve flotation cells. A vendor-supplied nitrogen plant is expected to provide flotation gas for the molybdenum circuit.
Additional Interesting Data and Summary
Process plant annual reagent and consumable consumption includes 12,515 t of SAG mill media, 16,154 t of ball mill media, 1,104 t of Cu-Mo primary regrind mill media, 1,020 t of Cu-Mo secondary regrind mill media, 493 t of PAX collector, 1,866 t of MIBC frother, 1,950 t of diesel, 38,761 t of quicklime, 1,105 t of sodium cyanide, 730 t of sodium hydrosulphide, 181 t of flocculant, and 16 t of sulphuric acid. Nitrogen air consumption is 7.74 Nm³/h.
Total installed process plant power is 237,179 kW with estimated annual consumption of 1,380,825 MWh. The grinding area dominates at 129,911 kW installed and 797,965 MWh/a consumption, followed by Cu-Mo flotation and regrind at 55,253 kW installed and 359,717 MWh/a.
Key Processes
- Two-stage crushing using a primary gyratory crusher and three secondary cone crushers, with covered stockpile storage
- SAG mill and ball mill grinding in three parallel lines, with hydrocyclone classification
- Bulk copper-molybdenum rougher flotation with coarse and fine regrind circuits
- Three-stage copper-moly cleaner flotation with cleaner scavenger
- Copper-molybdenum separation using NaHS and nitrogen gas
- Molybdenum rougher, scavenger, and two-stage cleaner flotation
- Copper concentrate thickening, filtration, and containerized truck loading
- Molybdenum concentrate thickening, filtration, drying, bagging, and truck transport
- Cyclone classification of tailings with sand used for dam construction and high-sulphur tails to separate disposal
Source: Berg Copper Project NI 43-101 Technical Report and Pre-Feasibility Study, British Columbia, Canada, June 12, 2026. Project website: Berg Copper Project
