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Mariwa-Sardine Hill

Oko Gold Region

Strategic Land Position in Guyana’s Emerging Oko Gold District

Overview

  • 100% acquisition via property option purchase
    • US$250k cash
    • 35M common shares
    • US$200k cash annually for 4 years (US$800k total)
    • 1.0% NSR with US$4M 100% buy-back right
  • Three contiguous MPMS permits totaling approximately 3,240 acres
  • Located within the prolific Guiana Shield gold province
  • Situated within the rapidly emerging Oko-Cuyuni gold district
  • Historical exploration completed by International Roraima Gold Corp., Newmont, and Guyana Frontier Mining
31kmfrom Oko Gold Project
8kmfrom Wariri Gold Project
18kmfrom Groete Creek Project
Lower Cuyuni – Oko Trend gold anomaly map with Mariwa-Sardine Hill location
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Investment Thesis

  • District-scale land position in one of Guyana’s most active gold camps
  • Historical drilling confirms broad zones of oxide gold mineralization
  • Multiple untested geophysical and geochemical targets
  • Opportunity to apply modern exploration to an underexplored system
  • A deliberate strategy to build, over time, a significant land position in the prolific, gold-fertile Oko–Cuyuni corridor
Regional Setting

Located Along a Major Emerging Gold Corridor

Exposure to a rapidly consolidating mining district.

Regional Context

  • Located within the Oko-Cuyuni mineralized corridor
  • Over 100 years of historical gold production from artisanal mining
  • Hosted within the same geological terrain as several significant gold discoveries
  • Recent consolidation activity has highlighted the strategic value of district-scale land packages

Regional Catalysts

  • Major industry attention following the announced combination of G Mining Ventures and G2 Goldfields
  • Growing institutional interest in Guyana as a premier exploration jurisdiction
  • Increasing competition for quality exploration assets within the district
Regional location map — Mariwa-Sardine Hill within the Lower Cuyuni district, Guyana
Sardine Hill property map showing the three permit boundaries, surrounding waterways, regional inset, scale and legend
Sardine Hill Property Map — select to enlarge.
Dormant gold project with vast economic upside

Historical Exploration Demonstrates Large Gold System Potential

Advanced Exploration

  • Highlight drill hole: 113.5 m @ 1.39 g/t Au*
  • Mineralization remains open along strike and at depth
  • Hole terminated in saprolite
  • Auger values up to 2.99 g/t Au

High-Grade Zone

  • Trench result 17.40 g/t Au over 1 m*
  • Multiple EM conductors remain untested by drilling

Underexplored Target

  • Auger results up to 1.95 g/t Au
  • Main anomaly remains open
  • Strong regional geochemical support
  • Geological, geophysical and geochemical data outline targets in saprolite and hard rock that haven’t been tested

A proven gold system once held by the world’s largest gold miner — advanced only sporadically, mostly during weak gold-price cycles — before ownership complications halted comprehensive work over 15 years ago.

Work completed — sporadic but spanning geology, geochemistry & geophysics
  • Airborne geophysics & electromagnetic surveys
  • Auger geochemistry, trenching & diamond drilling
Untested upside
  • Historical work chased shallow oxide — substantial hard-rock potential remains undrilled
The District

Historical Exploration Highlights Across Three Blocks*

  • The Sardine Hill – Lower Cuyuni district hosts extensive historical exploration data, including airborne geophysics, auger geochemistry, trenching and diamond drilling programs
  • Historical exploration programs completed by multiple operators since the early 1990s, including International Roraima Gold, Newmont, and Guyana Frontier Mining
  • Established the Lower Cuyuni prospect as a drill-confirmed gold zone with consistent mineralization across all three blocks, forming a coherent N-S corridor ~1,500 m in strike length
  • Historical reports indicate that much of the exploration focused primarily on shallow oxide mineralization, while the underlying fresh rock zones remain largely untested
  • Historic, independent geophysical surveys highlight the structural complexity of the district and the potential to define additional targets beyond the previously drilled zones

Block 1

  • The most advanced block in terms of historic data
  • Diamond drilling confirmed gold mineralization (1.39 g/t over 113.5 m ending in saprolite)
  • Deep weathering which in places extends greater than 100 m vertically, according to historic literature
  • Mineralized body remains open along strike and at depth
  • Several auger drill results showed gold up to 2.99 g/t Au from shallow depths

Block 2

  • Least explored block
  • Power auger sampling returned values including 1.95 g/t Au
  • Main anomaly remains open to the west
  • Regional stream sediment sampling returned 0.033 g/t Au (BLEG) in the Mariwa River drainage

Block 3

  • Hosts the highest individual gold result in the dataset
  • Trenching returned 17.4 g/t Au over 1 m within mica-chlorite schist
  • Interpreted high-grade structural zone linking the northern and southern anomalies
  • Multiple electromagnetic conductors across the block have yet to be drill tested

*Historical results have not been independently verified by Lighthouse Gold. References to drilling intersections refer to historical data acquired by third parties. Lighthouse Gold is currently preparing an independent NI 43-101 compliant Technical Report to verify & summarize all historical work over the Mariwa/Sardine Hill project.

Strategy

Clear Path to Define Gold Mineralization

Phase 1

Data Consolidation

  • Digitize historical datasets
  • Compile drilling records
  • Reconstruct historic drill hole and geophysical databases
  • Build integrated GIS platform
  • Actively pursue additional strategic land acquisitions to build district-scale portfolio
Phase 2

Target Generation

  • Structural interpretation
  • Geophysical reinterpretation
  • Geochemical targeting
  • District-scale prospect ranking
  • Airborne drone magnetics
  • Evaluation of regional exploration targets
  • Prioritize targets
Phase 3

Field Validation

  • Mapping
  • Sampling
  • Trenching
  • Ground IP geophysics
  • Shallow auger drilling
Phase 4

Drill Testing

  • Priority targets
  • Known mineralized zones
  • Untested conductors
  • Fresh rock source targets
Mineralization Definition via Drill & Exploration Programs
Roadmap

Work Program Timeline — Mariwa-Sardine Hill

Work Program*Q4 2026Q1 2027Q2 2027Q3 2027
Close Mariwa-Sardine Hill Acquisition
Phase 1 — Data Consolidation
(Includes NI 43-101 Property of Merit Report)
Phase 2 — Target Generation
Phase 3 — Field Validation
Phase 4 — Drill Testing (~3,500 m)

*Indicative only — sequencing and timing are subject to results and financing.

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