Premier Gold
Gold • Stewart BC
A historic mining complex with significant existing infrastructure, including a permitted mill, underground development, and surface facilities.
Project Overview
The Premier Gold Project is a historic underground gold–silver system located in British Columbia’s Golden Triangle, approximately 25 kilometres from Stewart, on Nisg̱a’a Nation Treaty Lands. The project includes multiple deposits—Premier, Silver Coin, Big Missouri, Dilworth, and Martha Ellen—and a fully permitted processing facility with a nominal capacity of approximately 2,500 tonnes per day.
Premier hosts an intermediate-sulfidation epithermal gold–silver system, with mineralization occurring in structurally controlled veins, breccias, and stockwork zones associated with quartz–sericite–pyrite alteration. The system is well understood through extensive historical drilling, underground development, and production data.
Within Cambria’s development strategy, Premier serves as the infrastructure and processing hub, while Red Mountain is prioritized as the initial source of high-confidence mill feed. Premier is positioned as a secondary production source over time, with contribution expected to increase as resource confidence improves through targeted infill drilling.
Premier combines scale, existing infrastructure, and geological endowment, providing long-term flexibility and optionality within Cambria’s disciplined, phased restart plan.
Project Highlights
The Premier Gold Project is a past-producing, multi-deposit underground operation with established reserves, a permitted 2,500 tpd processing facility, and significant site infrastructure in place. Located in the heart of the Golden Triangle, Premier provides the operational platform for Cambria’s staged restart strategy and long-term district development plan.
Historic, Infrastructure-Rich Gold Asset
One of the most established underground gold mining operations in the Golden Triangle, with a long production history and substantial existing infrastructure.
Operating-Scale Processing Facility
Fully permitted mill with a nominal capacity of approximately 2,500 tonnes per day, positioned to process ore from Premier and Red Mountain.
Multiple Deposits, Single Processing Hub
Five defined underground deposits — Premier, Silver Coin, Big Missouri, Dilworth, and Martha Ellen — providing long-term optionality and development flexibility.
Advanced Technical Foundation
Supported by extensive historical drilling, engineering studies, and a completed feasibility study, with an updated feasibility study planned.
Established Access and Power
Located near Stewart, British Columbia, with paved road access, grid-connected hydroelectric power, and proximity to a deep-water port.
Strategic Role in Cambria’s Development Plan
Positioned as a secondary production source following Red Mountain, contributing additional mill feed over time as resource confidence is upgraded.
Permitted and Previously Operated
Fully permitted underground mine and processing facility, with the site maintained under care and maintenance.
Significant Exploration and Development Upside
Large mineral inventory with opportunities to improve confidence through targeted infill drilling and staged redevelopment.
Mineral Resource Estimate
The Premier Gold Mine hosts a substantial gold and silver resource across multiple underground deposits, reflecting its long history of exploration and production. The resource base provides meaningful scale and long-term optionality, with opportunities to improve confidence through targeted infill drilling as part of Cambria’s phased redevelopment strategy.
Premier Area Resource Estimate at a 3.5g/t AuEq Cut-off - Effective date: December 12, 2019
| Class | Deposit | In-situ Tonnage (kt) | In-situ Grades | Metal | |||
|---|---|---|---|---|---|---|---|
| AuEq (g/t) | Au (g/t) | Ag (g/t) | Au (koz) | Ag (koz) | |||
| Indicated | Premier | 1,298 | 8.90 | 8.46 | 64.20 | 353 | 2,680 |
| Big Missouri | 1,116 | 8.48 | 8.36 | 16.90 | 300 | 607 | |
| Silver Goin | 1,597 | 7.77 | 7.61 | 23.00 | 390 | 1,181 | |
| Martha-Ellen | 130 | 5.80 | 5.47 | 48.00 | 23 | 201 | |
| Dilworth | - | - | - | - | - | - | |
| Total Indicated | 4,141 | 8.25 | 8.01 | 35.1 | 1,066 | 4,669 | |
| Inferred | Premier | 1,753 | 7.00 | 6.72 | 39.80 | 379 | 2,243 |
| Big Missouri | 1,897 | 8.44 | 8.34 | 14.70 | 508 | 896 | |
| Silver Coin | 523 | 7.19 | 7.03 | 23.20 | 118 | 390 | |
| Martha-Ellen | 653 | 6.36 | 6.12 | 34.30 | 129 | 720 | |
| Dilworth | 235 | 6.51 | 6.13 | 56.10 | 46 | 424 | |
| Total Inferred | 5.061 | 7.45 | 7.25 | 28.7 | 1,180 | 4,673 | |
- 1. Mineral Resources are estimated at a cut-off grade of 3.5 g/t AuEq based on metal prices of US$1,300/oz Au and US$20/oz Ag.
- 2. The AuEg values were calculated using US$1,300/oz Au, US$20/oz Ag, a silver metallurgical recovery of 45.2%, and the following equation: AuEq = Au g/t + (Ag g/t x 0.00695).
- 3. A mean bulk density of 2.85 t/m3 is used for Premier and of 2.80 t/m3 for all other deposit areas.
- 4. A minimum mining width of 2.5 m true thickness is required to be classified as Resource material.
- 5. Numbers may not add due to rounding.
The majority of the Premier resource is hosted within structurally controlled epithermal gold-silver systems typical of the Golden Triangle. Mineralization occurs in veins, breccias, and stockwork zones, resulting in variable geometry and grade continuity across deposits.
Development Timeline
Sequenced to Align Confidence, Infrastructure, and Execution
Cambria’s development plan for the Premier Gold Mine is intentionally sequenced behind Red Mountain. This approach aligns mine development, resource confidence, and mill utilization to reduce risk and support a disciplined restart.
2026–2027: Mill Care & Maintenance / Optimization
- Premier mine and mill placed on care and maintenance during Red Mountain development
- Maintain compliance and reduce operating costs during this period
- Advance mill optimization planning for Red Mountain–led operations
2026–2027: Premier Resource Confidence & Readiness
Improve resource confidence in areas intended to supply mill feed, directly addressing historical uncertainty.
- Targeted infill drilling from existing underground workings at Premier
- Tightening drill spacing to improve grade control and mine planning
- Conversion of selected resources to higher-confidence categories
- Release of drilling results, including previously embargoed data
2026: Updated Feasibility Study
Provide technical and economic validation of the integrated development strategy.
- Completion of an updated feasibility study reflecting:
- Red Mountain as the primary feed source
- Premier as a secondary, complementary source of mill feed
- Revised development sequencing and capital allocation
- Updated resource and reserve estimates
2026–2027: Red Mountain Development
Bring the highest-confidence orebody into production first while preparing Premier for integration.
- Construction of the Red Mountain access road (critical path)
- Underground development and mine preparation at Red Mountain
- Advancement of mill optimization planning and long-lead equipment procurement
- Premier remains on care and maintenance during this phase
2027–2028: Mill Restart & Integration
Restart operations with stable throughput, improved grade control, and operational flexibility.
- Completion of mill upgrades, including fine-grinding circuit installation
- Commissioning of the processing facility
- Initiation of Red Mountain ore processing
- Phased introduction of Premier ore as resource confidence and development progress
Geology and Exploration
The Premier Gold Mine is located within the southern portion of the Golden Triangle and is part of a well-documented intermediate-sulfidation epithermal gold–silver system. This deposit type is characteristic of several historically productive mines in the region and is known for hosting high-grade gold and silver mineralization.
Mineralization at Premier occurs within structurally controlled veins, breccias, and stockwork zones, typically associated with areas of strong quartz–sericite–pyrite alteration. Gold is most commonly present as electrum, with silver occurring in a combination of native silver and silver-bearing minerals. Minor base metals, including zinc and lead, are locally present.
Property Infrastructure
The Premier Gold Mine is one of the most infrastructure-rich gold assets in the Golden Triangle. The site hosts a fully permitted processing facility and extensive surface and underground infrastructure, providing a strong foundation for a staged restart aligned with Cambria’s development strategy. Premier’s infrastructure serves as the processing and operational hub for Cambria’s portfolio. When combined with Red Mountain, the site enables a hub-and-spoke development model that prioritizes high-confidence ore while maintaining long-term flexibility and scalability.
Processing Facilities
- Fully permitted crush–grind–cyanidation processing plant
- Nominal processing capacity of approximately 2,500 tonnes per day, with flexibility depending on ore characteristics
- Carbon-in-leach (CIL) circuit designed for gold and silver recovery
- Existing mill buildings, workshops, assay laboratory, and cold storage facilities
- Tailings Storage Facility (TSF) and water treatment systems in place
- The mill has been maintained under care and maintenance and is planned to be refurbished and optimized to support Red Mountain-led operations, with Premier ore introduced on a phased basis.
Power, Access, and Utilities
- Connected to a 25 kV power line from BC Hydro
- Proximity to a 31 MW hydroelectric facility located approximately 700 metres from the mill site
- Backup on-site diesel generation capacity
- Established site access roads and underground portals
- The project benefits from its proximity to Stewart, which provides road access, a skilled workforce, fuel, supplies, and logistics support.
Underground Infrastructure
- Multiple underground portals and existing ramp access
- Significant historical underground development across multiple deposits
- Waste rock facilities and underground service infrastructure in place
- This existing development reduces upfront capital requirements and allows for selective, staged re-entry as part of future mine planning.
Regional Infrastructure
- Access to a deep-water, ice-free port at Stewart for concentrate shipment
- Paved highway connection to regional transportation routes
- Established mining service base in the Stewart–Hyder region
Property History
The Premier Gold Mine is one of the most established gold operations in British Columbia’s Golden Triangle, with over a century of mining history.
- Underground mining began in 1918 and continued until 1952
- Historic production totaled approximately 2 million ounces of gold and 40+ million ounces of silver
- The property was redeveloped in the late 1980s, with a new mill constructed by Westmin Resources Ltd.
- Production resumed from 1989 to 1996, generating approximately 260,000 ounces of gold and 5.1 million ounces of silver
- The mine was placed on care and maintenance in 2001, following reclamation and installation of long-term water treatment systems