‍

‍

‍

‍

Overview

The Kogo Project is an exploration license acquired by EsoTerra Investments Limited to investigate the presence of cassiterite (tin), tungsten, copper, and lead-zinc mineralization in Bauchi State. The site is historically known for alluvial tin and wolfram mining dating back to the WWII era (1939–1945), when it attracted interest from multiple European mining companies, including Nigerian Tin & Exploration Co. Ltd., Bisichi-Jantar (Nig.) Ltd., and Kaffo Mines Ltd.

In 1952 and again in 1967, Kaffo Mines Ltd. conducted the first systematic surface sampling of the quartz-greisen lodes. The Nigerian Mining Corporation (NMC) later took over exploration from 1979 to 1982, conducting surface mapping and core drilling campaigns that generated valuable geological data.

‍

‍

Geological Promise

Two major quartz-greisen lode systems have been identified, mapped, and sampled:

• Main Lode: North–South trending, 1.3km long with two defined branches
• Major Lode: Northwest–Southeast trending, 2.7km long, with a parallel 1.3km North Lode

Additional satellite greisen zones include:

• Doka East veins
• Doka West veins
• Multiple additional quartz-greisen veins across the area

Historical exploration by NMC included 36 core drill holes and surface sampling of these lodes, indicating strong mineralization with promising grades.

‍

‍

Key Assay Highlights

• A 600kg bulk sample from the Main Lode returned:
  • 0.41% Sn
  • 0.054% WO₃
• Major Lode surface samples (23 locations) averaged 0.29% Sn
• The higher-grade northwest zone of the Major Lode (10 locations, ~1km) averaged 0.66% Sn
• Core drilling data shows:
  • 500m northern Main Lode is the most prospective
  • Increasing quartz-greisen lode width with depth
  • Average 0.23% Sn across the 1.3km drilled portion of the Major Lode
  • 0.36% Sn across 7.2m width within the 1km enriched zone

‍

Base metal enrichment in this zone includes:

• 1–12% Copper (Cu)
• 1–3% Lead (Pb)
• 1–5% Zinc (Zn)
• 100–336g/t Silver (Ag)
• Up to 200g/t Cadmium (Cd)

‍

‍

‍

‍

Challenges and Next Steps

While historical data is extensive, key gaps remain—including missing core samples, drilling logs, and original assay reports—making the results difficult to independently verify.

EsoTerra is addressing this by preparing to carry out Twinning Check Core and Reverse Circulation (RC) Drilling on selected boreholes from the original NMC program. This will help confirm the historical data and build a verifiable foundation for future exploration and development.

‍

‍