St. Barbara Ltd. · ASX:SBM
St. Barbara — Mining Society of Nova Scotia (June 2025)
24 slides from St. Barbara's conference presentation, Jun 13, 2025
Slide 1: 15-Mile Consolidated: Mitigation by Design
15-Mile Consolidated: Mitigation by Design Craig Hudson, P. Eng June 2025
Slide 2: Land Acknowledgment
Land Acknowledgment 15 - Mile
Slide 3: Disclaimer
Disclaimer This presentation has been prepared by St Barbara Limited (“Company”). The material contained in this presentation is for information purposes only, and is supplied for the exclusive use of the recipient (Recipient) on the condition that the existence and contents of the presentation and
Slide 4: Disclaimer: Competent Person Statement
Disclaimer Competent Person Statement This presentation contains production targets and forecast financial information derived from those production targets (including in respect of all-in sustaining costs and capital costs). The Information relating to the 15-Mile Processing Hub contained in this p
Slide 5: Agenda
5 Agenda • Introduction to 15-Mile Consolidated Project ‒ Overview ‒ Production ‒ Benefits to Nova Scotians • Mitigation By Design ‒ 15-Mile ‒ Beaver Dam ‒ Cochrane Hill Want more info? • Next Steps in Project Development • Community Involvement • Touquoy Update May 29th, 2025 15-Mile Consolidated P
Slide 6: Project Overview
6 Project Overview • Location ‒ 15-Mile Consolidated Project consists of 3 gold mining deposits: i. 15-Mile ii. Beaver Dam iii. Cochrane Hill ‒ All located on the Eastern Shore on Nova Scotia ‒ Historically contaminated locations i. +3,000,000 m3 of historic tailings. ii. Commitment to clean up any
Slide 7: Project Overview: Re-design Approach
7 Project Overview • Re-design Approach ‒ Since 2023 all 3 projects have undergone a complete re-design. ‒ Leveraged previous information requests from previous permitting efforts i. +1,000 Information Requests from Regulators, Communities, First Nations & other organizations etc. ‒ Applying lessons
Slide 8: Project Overview: Gold Production
8 Project Overview 1.40 120 • Long-term responsible production 1.20 100 Gold Production (koz) • Operational Data Head Grade (g/t) 1.00 80 ‒ 11.2 Year Life-of-Mine 0.80 60 0.60 103 105 108 102 104 105 107 103 110 106 i. Beaver Dam starts in year 4 40 0.40 ii. Cochrane Hill starts in year 6 0.20 20 25
Slide 9: Socio-Economic Benefits - Update
Socio-Economic Benefits - Update Economic Benefits for Nova Scotia Construction Operation Provincial Household Phase Phase 15-Mile Consolidated Gold Project GDP Impact Income $236.5M $163.4M 1,386 723 Economic Benefits during in wages during total full-time jobs total full-time jobs construction ASX
Slide 10: 15-Mile Project
15-Mile Project
Slide 11: 15-Mile
11 15-Mile • Environmental constraints and planning for closure informed initial project design • Mine Planning ‒ Relaxed mine plan to reduce the need for surface stockpiles and balance strip ratio ‒ Complete removal of medium & low-grade stockpiles ‒ Leverage multiple pits for progressive backfilli
Slide 12: 15-Mile: Tailings, Infrastructure and Water Management
12 15-Mile • Tailings ‒ Recently completed a Multiple Accounts Analysis (part of MDMER) to evaluate deposition methodology, required disturbance areas and existing topographical information to minimize environmental impacts ‒ Reduction in CDA risk rating ‒ Water storage optimization for source term
Slide 13: Layout 15-Mile
13 Layout 15-Mile • Removal of med/low grade stockpiles • Reduced NAG stockpile • Progressive PAG backfilling and no exposed PAG material on surface • Improved CDA risk rating • Proposed by-pass trails for ATV + public use. • Renewable Opportunity for long term post closure benefits ‒ Closed-loop pu
Slide 14: Beaver Dam Project
Beaver Dam Project
Slide 15: Beaver Dam
15 Beaver Dam • Redesign begins with the fundamentals • Impacted historical tailings will be remediated and stored at 15-Mile. • Pit Optimization ‒ Optimization opportunity in open pit size to reduce impacts, waste rock while balancing environmental constraints. i. Reduction of 24 Mt of waste materi
Slide 16: Layout Beaver Dam
16 Layout Beaver Dam • Significantly reduced open pit design • Reduced stockpiles • Temporary PAG pile which gets rehandled back into open pit. • No industrial water withdrawals • Stockpiles located to reduce impacts on watersheds. • Reduced project area :159 ha • Reduction in disturbance: 86 ha (42
Slide 17: Cochrane Hill Project
Cochrane Hill Project
Slide 18: Cochrane Hill
Cochrane Hill 18 • Assess Alternatives and Optimize • Pit Optimization ‒ Reduced open pit size ‒ Avoids highway 7 realignment ‒ Reduce waste material. • Project Trade-off Studies ‒ Previous project designs included a process plant and tailings facility with gravity + float concentrate being transpor
Slide 19: Layout Cochrane Hill
19 Layout Cochrane Hill • Significantly reduced open pit design • No need to realign highway 7 • Reduced surface stockpiles • Temporary PAG pile which gets rehandled back into open pit. • No industrial water withdrawals • Stockpiles located to reduce impacts on watersheds. • Reduction in disturbance
Slide 20: Next Steps
Next Steps
Slide 21: Next Steps
21 Next Steps • Rapid Gap Analysis and Trade off Studies ‒ Refined layout analysis ‒ Metallurgical test work ‒ Ongoing baseline and site characteristics ‒ Early indicative GW and SW modelling • Engagement Ramp Up • Pre-Feasibility Study Fall 2025 • Preparation of Environmental Impact Assessment • Re
Slide 22: Community Involvement
Community Involvement • St Barbara is committed to building Stronger Communities • Between 2017-2025 St Barbara contributed over $1,100,000 to local community organizations • +20 Community Partnership Agreements have been signed with local community groups • Fed 1,000 families through food bank at d
Slide 23: Touquoy Update
Touquoy Update Reclamation Ongoing • Actively reclaiming the site • Spent +$9M in FY25 on reclamation activities • Forecasted to spend $7M in FY26 in this coming year • Pumped Hydro Potential of 80MW The Touquoy Story • Employed up to 355 people over a 7-year period • Average annual property taxes:
Slide 24: Questions?
ae St Barbara Questions? Want more info? a May 29', 2025 15-Mile Consolidated Press Release
St Barbara — Mining Society of Nova Scotia (June 2025) on 6ix