Galamsey: Why Ghana Can’t Simply Ban Its Poisoned Rivers

There is a river in southern Ghana that older residents remember fishing in and drawing water from without a second thought. Today that same river runs the colour of rust, thick with sediment and unsafe to touch.

The cause has a name: galamsey, the Ghanaian term for illegal artisanal and small-scale gold and diamond mining that operates entirely outside the country’s formal regulatory system. This is not a fringe activity. Research indicates that roughly 5.5 million Ghanaians are directly or indirectly reliant on artisanal and small-scale mining (ASM) as of 2025, placing galamsey at the exact point where national economic survival collides with ecological catastrophe.

That is the paradox at the heart of the problem in Ghana. The activity poisoning the rivers is also the income keeping millions of rural families afloat. What follows here traces how galamsey works, why it has survived every attempt to stop it, and what the latest policy reforms are genuinely trying to do differently.

What galamsey actually is, and why mercury is at the centre of it

Galamsey describes unlicensed mining that targets gold and diamonds without any of the permits, environmental controls, or monitoring that formal operations require. Because it sits outside the regulatory framework entirely, authorities struggle even to measure it, let alone govern it.

From hand panning to heavy machinery

For much of its history, galamsey was hand-based work: panning, digging, and washing ore by muscle alone. That changed with the arrival of foreign capital, particularly the involvement of Chinese nationals who brought excavators and heavy equipment into the sector.

The mechanisation transformed the economics and the damage in one stroke. Excavators can tear through riverbanks and farmland at a pace hand tools never could, dramatically raising both the profitability of illegal operations and the speed at which land and water degrade.

The mercury pathway

The environmental danger, though, is chemical rather than mechanical. To extract gold, miners mix mercury with crushed ore. The mercury binds to the gold particles, and the resulting amalgam is then heated so the mercury burns off, leaving the gold behind.

The chemical pathways visible in Ghana’s rivers are part of a broader pattern: gold mining contamination follows similar mechanisms across jurisdictions, with mercury amalgamation, cyanide leaching, and heavy-metal runoff documented at formal and informal operations worldwide.

That process releases toxic mercury vapour into the air and deposits mercury residue directly into rivers and soil. Cyanide and arsenic are used in processing as well, compounding the contamination.

Here are the three main toxic inputs and what each one does:

• Mercury: used to bind gold in amalgamation, then released as vapour and sediment residue that persists in the environment for decades.
• Cyanide: used in ore processing, causing acute poisoning of aquatic life and fish kills.
• Arsenic: a heavy-metal contaminant that saturates riparian zones, the vegetated strips along riverbanks.

The mercury story does not end where it enters the water. Once deposited in river sediment, elemental mercury converts into methylmercury, a far more toxic compound.

Methylmercury bioaccumulates in fish and biomagnifies up the food chain. Chronic exposure is linked to neurological damage, cognitive impairment, and developmental harm in children and unborn babies.

That single mechanism is why galamsey is a toxicology problem, not just an illegal mining problem. Communities eating river fish far downstream from any mining site are being poisoned slowly and invisibly, even if they have never touched a pan or an excavator. Grasping the chemistry, rather than the vague label “pollution”, is what makes it clear why a short-term crackdown cannot reverse harm that is already cycling through the food web.

Rivers turned rust: the scale of environmental destruction across Ghana’s waterways

The evidence against galamsey now reads like a mounting case file, with each peer-reviewed study adding weight to the same conclusion. This is not localised damage. It is a rivers-wide collapse of water quality.

A January 2026 ecological study in the African Journal of Tropical Environment and Occupational Health reported “severe contamination” and serious ecological degradation, naming the Pra, Ankobra, and Birim rivers directly. A November 2025 study in Scientific Reports documented mercury, arsenic, and other trace elements in the Offin River at levels significantly exceeding safe guidelines. A 2025 article in the International Journal of Research and Innovation in Social Science found that toxic runoff is threatening the long-term viability of the communities living alongside these waterways.

The table below sets out what the recent studies documented.

The consequences are both visible and measurable: turbid, discoloured water, fish kills, degraded riverbank vegetation, and farmland made unproductive by soil disruption and chemical saturation.

The NIH integrated assessment of ASGM in Ghana documents heavy metal contamination from mercury, arsenic, cadmium, and lead across soil, water, and sediment in the country’s river systems, providing a comprehensive natural sciences baseline against which current pollution readings can be measured.

Why is fixing this so hard? Several barriers make remediation exceptionally difficult:

• Mercury persistence: once deposited, it cycles in the environment for decades.
• Flood remobilisation: seasonal flooding stirs contaminated sediment back into the water.
• Diffuse geography: contamination is spread across remote river systems, not concentrated at one source that can be sealed off.
• Re-contamination pressure: cleared areas are reoccupied by returning miners unless remediation is paired with real livelihood alternatives.

The value of this evidence for you is straightforward. The damage is now documented at a scientific level that makes it impossible to dismiss as anecdotal, and it explains why international health agencies, observers, and investors treat galamsey as a national crisis rather than a policing inconvenience. The window for easy cleanup has already closed.

Why a million livelihoods make galamsey almost impossible to ban

The instinct is simple: if it is illegal and it poisons rivers, stop it. That logic collapses the moment you look at who depends on the sector.

An August 2025 report from the Ecofin Agency estimated that around 1 million people work directly in galamsey, with a further 4.5 million dependent on it indirectly. A 2024 Mongabay feature on global artisanal mining put the figure at more than 12% of Ghana’s population relying on the sector for survival. For most of these workers, illegal gold mining pays far more than farming or any other rural option, which is exactly why enforcement meets resistance rather than cooperation.

The livelihood tension visible in Ghana is not unique to that country; ASM across Africa generates employment and foreign exchange in rural economies where formal sector alternatives are sparse, which is precisely why enforcement-only strategies have produced similar failure patterns from Mali to Zimbabwe.

Then there is the sheer scale of illegality. According to a 2024 World Bank formalisation report, only about 750 licensed small-scale mining operations existed in 2023.

Those 750 licensed operations covered roughly 10% of the sector, meaning approximately 90% of ASM activity was completely illegal and unmonitored.

That 90% figure is the single most clarifying number in the whole debate. It tells you that enforcement without formalisation is not policing a small minority of bad actors. It is trying to suppress the overwhelming majority of an entire industry.

The history bears this out. In 2017, Ghana banned ASM and launched Operation Vanguard, a joint military and police taskforce that expelled Chinese operators and achieved real initial suppression. Once the pressure eased, the miners came back. The economic incentives had never been touched, and patronage networks shielded some operators from consequences altogether.

Recent research points to four reasons these campaigns keep failing:

1. Economic pull: the returns from galamsey dwarf local alternatives, so enforcement collides directly with mass livelihood dependence.
2. Scale of illegality: with 90% of activity unlicensed, there is no small group to isolate and remove.
3. Policy oscillation: sudden crackdowns push miners deeper underground while formalisation lags behind, creating cycles of suppression and partial accommodation.
4. Political dynamics: patronage networks and protection of well-connected operators undermine enforcement, while frontline task forces lack local legitimacy.

Understanding why bans fail is the prerequisite for judging whether any new policy can succeed. Coercion alone has never worked here, and the structure of the sector explains precisely why.

From Operation Vanguard to rCOMSDEP: Ghana’s pivot from banning to building

Ghana’s policy story is a slow arc from coercion toward formalisation. After the 2017 ban, the government introduced the Community Mining Scheme (CMS) to register small-scale miners, grant them legal status within defined boundaries, and restrict operations to Ghanaian citizens.

According to July 2025 Ministry of Lands and Natural Resources data, the CMS spanned 15 legal schemes and generated about 60,000 direct and 22,800 indirect jobs, though these figures have not been independently verified. The scheme was an honest attempt, but it left roughly 90% of ASM still unlicensed and suffered from elite capture, weak oversight, and inadequate environmental safeguards.

That failure prompted a structural redesign. On 4 August 2025, Cabinet approved the Responsible Cooperative Mining and Skills Development Programme (rCOMSDEP), which merged CMS with the National Alternative Employment and Livelihood Programme (NAELP). It launched publicly on 6-7 August 2025 as Ghana’s flagship ASM reform.

Artisanal gold formalisation efforts across the continent have repeatedly encountered the same chokepoints: weak cadastral systems, inadequate financing for miners transitioning to legal status, and traceability frameworks that collapse when supply chains cross informal borders.

Three features distinguish rCOMSDEP from what came before:

• Community-owned cooperatives: legally recognised, locally run, and requiring endorsement from traditional authorities before mineral rights are granted.
• Centralised mercury-free processing: shared, mercury-free processing facilities and water treatment plants, plus mobile licensing teams.
• Integrated skills and rehabilitation: vocational training and structured restoration of degraded land.

The financial design is what the investment community is watching most closely.

rCOMSDEP allocates 60-80% of profits to cooperatives and communities, and the Ghana Chamber of Mines endorsed the cooperative model at the August 2025 launch.

For formal licensed miners, that endorsement is not charity. Illegal operations in shared watersheds create contamination liability, security risks, and reputational damage that gets conflated with legal mining, eroding social licence. Effective formalisation lowers the ESG risk premium attached to operating in the same river systems.

The table below compares the two programmes.

The shift to cooperative ownership backed by traditional authority endorsement is a structural bet: that community legitimacy can achieve what military taskforces never could. Whether that bet pays off is still ahead of Ghana, not behind it.

What needs to change before Ghana’s rivers recover

Environmental science and policy analysis broadly agree on what meaningful progress requires. Strict control of toxic chemicals, adoption of mercury-free technologies, sustained land rehabilitation, and livelihood transitions that give miners a credible alternative rather than just a legal label.

Nature-based mine restoration approaches, including phytoremediation plantings, constructed wetlands, and riparian buffer re-establishment, have shown measurable results in post-mining landscapes, though all require that new contamination inputs stop before recovery processes can take hold.

Judged honestly against those conditions, rCOMSDEP addresses several of them by design. Its mercury-free processing, cooperative structure, and training components map directly onto the expert consensus. But its success hinges on three things that are not guaranteed: consistent enforcement, sustained government funding, and protection against the elite capture that hollowed out CMS.

The remediation science raises the stakes further. Because mercury cycles through the environment for decades and is remobilised with every flood, the damage already recorded in the Pra, Ankobra, Birim, and Offin rivers will not clear quickly even if new contamination stops tomorrow.

If you are tracking Ghana’s mining sector or ASM reform more broadly, three indicators tell you whether this is working:

• The licensed-to-unlicensed ratio: does the 90% illegality baseline from the 2024 World Bank report actually start falling?
• Water quality in named rivers: do the systems documented in the 2025-2026 studies show measurable improvement?
• Miner migration into cooperatives: does the profit-sharing model draw miners out of illegality, or merely add a cooperative layer on top of informal operations that continue as before?

The honest read from the evidence is this: Ghana’s policy architecture is more sophisticated than it has ever been, but the structural incentives that built the crisis have not disappeared.

This article is for informational purposes only and should not be considered financial advice. Investors should conduct their own research and consult with financial professionals before making investment decisions. Forward-looking statements about policy outcomes are speculative and subject to change based on enforcement, funding, and political developments.