By Ahmed Sahid Nasralla (De Monk)
As Sierra Leone’s Mining Week 2026 comes to an end, national attention has largely centred on investment opportunities, mineral exports, policy reforms and the government’s commitment to responsible mining.
However, beyond the speeches and exhibitions lies a deeper and more strategic concern that could shape the long-term future of Sierra Leone’s mining sector: what became of the country’s ambitious airborne geological survey after the data was collected?
Several years before Mining Week evolved into a major national event, Sierra Leone launched one of its most significant geological projects, the National Airborne Geophysical Survey (NAGS), supported by the World Bank and implemented through the Ministry of Mines alongside the National Minerals Agency.
The exercise involved aircraft fitted with advanced sensors flying across the country to gather aeromagnetic and radiometric data aimed at improving geological understanding and boosting mineral exploration.
At the time, expectations surrounding the project were extremely high. Communities in mining regions were sensitised ahead of the exercise as aircraft moved across the skies collecting scientific information expected to redefine knowledge about Sierra Leone’s mineral resources.
The writer, who worked with the World Bank technical team within the Ministry of Mines during the project, recalled being contracted to produce public awareness and community sensitisation materials for the nationwide exercise.
The survey was widely regarded as a landmark scientific initiative capable of unlocking Sierra Leone’s hidden mineral wealth. It eventually produced extensive geological outputs, including high-resolution geological information, mineral favourability maps, target identification datasets and technical interpretation products covering the entire country.
Among the key outputs were geological and basement maps, mineral prospectivity studies for commodities such as gold, rutile, bauxite and nickel, as well as kimberlite and iron target datasets.
However, mining and geological expert, Ansu Katta, says an important technical distinction is often overlooked in public discussions surrounding the survey.
“Geophysical surveys do not and cannot estimate resources,” Katta explained. “It only provides mineral indications based on magnetic and radiometric signatures.”
According to him, while airborne surveys can identify areas where minerals may exist beneath the surface, they cannot determine the actual quantity of minerals available, whether deposits are commercially viable, or if extraction would be economically feasible.
Such conclusions, he noted, require additional scientific work including geological mapping, geochemical surveys, ground verification, sampling, drilling, resource estimation and feasibility studies.
Katta further disclosed that he is unaware of any coordinated government-led geochemical follow-up programme carried out after the airborne survey.
“Further works based on the geophysical datasets have been mostly restricted to exploration licences held by private companies,” he stated.
The observation raises broader questions about Sierra Leone’s long-term mineral strategy and whether the country established a structured national framework to convert airborne geological indications into verified sovereign geological knowledge.
While private sector exploration remains important for attracting investment into the mining sector, the article argues that governments must also build strong independent geological intelligence systems capable of guiding national planning, negotiations and mineral development policies.
The concern, according to the piece, is that if detailed geological knowledge remains concentrated within private exploration portfolios, the country risks limiting its own long-term scientific and strategic understanding of its mineral resources.
Such knowledge is considered essential not only for licensing and negotiations but also for industrial planning, mineral diversification and future revenue management.
Although Mining Week 2026 showcased Sierra Leone’s enormous mineral potential, the article suggests that the more pressing issue may now be whether the country is investing enough in the scientific processes required to properly understand and manage that potential.
According to the commentary, while the airborne survey successfully produced maps and identified mineral signatures years ago, the larger journey from airborne indications to verified national geological knowledge may still remain incomplete.
The article concludes that as Mining Week 2026 closes, the real challenge for Sierra Leone may no longer be identifying mineral possibilities, but building the scientific foundation necessary to fully understand and strategically manage its mineral future.