When a journalist in Tanzania attempts to document what happens near a gold mine — pollution in the rivers downstream, police violence against artisanal miners, the gap between a company’s community commitments and what residents actually receive — they enter territory that is simultaneously legally hazardous, physically dangerous, and institutionally hostile. The laws that could protect their work are selectively enforced. The companies they investigate have legal teams and government relationships that most reporters cannot match. The communities whose stories they tell are often too vulnerable to speak on record. It is precisely this environment that makes dedicated investigative outlets essential — publications like mining investigations Tanzania platform Madini Today, which applies sustained editorial focus to the extractive sector at a time when the boom in investment is intensifying both the stakes and the risks of accountability reporting.
This article examines what mining investigations in Tanzania actually involve: the documented cases that have defined the genre, the systematic obstacles that investigators face, the specific issues — mercury pollution, police violence, smuggling networks, contract opacity — that most need investigative scrutiny, and the conditions required for this work to continue in an environment that is tightening around it.
The North Mara Case: A Template for What Investigations Uncover
No single site in Tanzania better illustrates the full range of issues that mining investigations confront than the North Mara Gold Mine in Tarime District, Mara Region — an operation owned by Barrick Gold that has been one of the most consistently documented subjects of investigative reporting in East African extractive journalism.
The pattern of documented allegations at North Mara spans decades and involves multiple overlapping issues: water contamination from tailings dam incidents affecting the Tigithe River and downstream communities, violence against community members who enter mine waste rock areas in search of residual gold, and what critics describe as the effective deputisation of the national police force as a corporate security resource.
Since February 2024, police have been credibly implicated in the killing of at least six people, with several others injured, during clashes near the North Mara Gold Mine in Tarime District. Police accused the victims of invading the mine and engaging in illegal small-scale mining. Rights groups and community members alleged that officers assigned to the mine committed arbitrary detentions, beatings, shootings, and torture of residents of surrounding communities — while police made no arrests related to these alleged abuses.
A leaked memorandum of understanding between the North Mara Gold Mine and the Tanzania Police Force — documented by investigative reporters — indicated a formal arrangement under which the government provides approximately 152 police officers to ensure mine security under a 2022 agreement. The corporate capture of public law enforcement for private security functions is not unique to Tanzania, but the documentation of this specific arrangement illustrated how formal the relationship between mining company and state security apparatus had become — and how difficult it is for communities to seek redress when the institution nominally responsible for their protection is contractually oriented toward the mine’s interests.
The response of the deputy minister of minerals when Human Rights Watch published a report on North Mara killings in 2024 was itself instructive: he warned international NGOs against “sneaking” into Tanzania to conduct human rights interviews — a formulation that treats accountability documentation as a form of trespass rather than legitimate oversight. Barrick’s chief executive described the allegations as baseless and requested a government investigation — a request for the same institution implicated in the abuses to investigate itself.
The Journalism That Reaches This Story — and the Price It Carries
The North Mara story has been covered by Forbidden Stories — an international consortium of 40 journalists publishing across 30 media organisations — as part of its Green Blood series documenting journalists who have been threatened, jailed, or killed while investigating environmental issues. Their investigation found that at least a dozen reporters, both local and international, who wrote about North Mara have been censored or threatened.
The legal environment that enables this suppression is explicit. Tanzania’s cybercrime legislation provides for criminal penalties — including imprisonment — for publishing information deemed “false, deceptive, misleading, or inaccurate.” The breadth of this formulation, combined with the absence of a robust public interest defence, creates a legal instrument that can be deployed against accurate investigative reporting simply by characterising its conclusions as inaccurate. The burden of proof effectively shifts to the journalist rather than the complainant.
The consequences are documented. Journalist Erick Kabendera, one of Tanzania’s most prominent investigative reporters with experience covering the extractive sector, was arrested in 2019 and held for months before charges were eventually resolved. The case sent a signal to the entire Tanzanian journalism community about the personal risks of pursuing investigations that implicate politically connected interests.
In this context, the organisations that continue to investigate Tanzania’s extractive sector — domestic outlets operating under legal pressure, international investigative networks that provide some degree of protective distance, and civil society researchers who operate under NGO frameworks rather than press credentials — perform a function that is genuinely difficult and genuinely important. The infrastructure of accountability around Tanzania’s mining sector is thin, and each organisation that leaves it becomes a gap that information asymmetries fill.
Mercury: The Slow Investigation That Nobody Wants to Publish
If North Mara represents the high-profile end of mining investigation — corporate giants, international attention, documented killings — mercury contamination in Tanzania’s artisanal and small-scale gold mining (ASGM) sector represents the opposite: a diffuse, chronic, technically complex problem that is extraordinarily difficult to investigate and almost impossible to attribute to any single identifiable actor.
In Geita, Shinyanga, and Mbeya — the heartland of Tanzania’s artisanal gold mining economy — mercury is the primary gold recovery method for approximately 1.5 million ASGM workers. An estimated 10 to 15 tonnes of mercury is burned or dumped into rivers and soils annually in these regions. The mercury accumulates in aquatic food chains, concentrating in fish that are a dietary staple for communities throughout the Lake Victoria basin. The human health consequences — neurological damage, reproductive harm, kidney failure — are documented in medical literature but rarely connected in public reporting to their source in the mining sector.
Tanzania ratified the Minamata Convention on Mercury in 2017, committing to develop a National Action Plan to reduce mercury use in artisanal mining. The National Action Plan aimed to halve mercury use by 2024 by promoting gravimetric alternatives. As 2025 arrived, little had demonstrably shifted. Mercury flows in informal markets at approximately US$50 per kilogram, supplied by brokers operating through pre-financing schemes in which miners receive materials and supplies in exchange for gold — arrangements that create both dependency and opacity that formal regulation struggles to penetrate.
The comparison with neighbouring countries is pointed. Ghana’s 2017 ban on mercury in artisanal gold mining reduced ASGM mercury use by an estimated 30% within two years. Zimbabwe’s partial restrictions have nudged some miners toward cleaner technologies. Tanzania’s approach — primarily voluntary adoption of alternatives, with limited enforcement — has not produced comparable results. Investigating why this is the case requires understanding the political economy of the informal mining sector: the economic interests of mercury traders, the pre-financing relationships that make miners dependent on suppliers, the capacity constraints of enforcement agencies, and the political sensitivity of regulating a sector that employs 1.5 million people.
Community-based environmental monitoring programs — including work by Source International and partners in Nyamongo, near North Mara, training local faith leaders and community members to use multiparametric field probes for water quality testing — represent one response to the investigation gap. When formal journalism cannot access the data and the regulatory system does not produce it, communities can sometimes generate it themselves. The samples collected by trained community monitors in the rainy season of late 2025 will add to a body of locally-generated evidence that complements what journalists and NGOs can produce from the outside.
Mineral Smuggling: The Invisible Trade That Investigation Can Make Visible
The TZS 3.3 billion in minerals seized in 55 separate anti-smuggling operations between July 2025 and March 2026 represents the visible tip of a trade that Tanzania’s own estimates suggest costs the country approximately $500 million annually in lost revenue. The government’s seizure operations — conducted jointly by the Ministry of Minerals, the Tanzania Police Force, the Tanzania Revenue Authority, and regional security committees — are documented in official announcements. What they do not illuminate is the network structure of the trade: who organises the cross-border flows, which officials are implicated in allowing or facilitating them, how gold is laundered into legitimate supply chains once it crosses the border, and which downstream buyers in the global jewellery and electronics supply chains are receiving informally-mined Tanzanian gold.
These are investigation questions, not statistics questions. The difference between an official announcement that 55 operations seized minerals worth TZS 3.3 billion and an investigative account of how mineral smuggling actually works — the logistics, the financing, the corruption, the beneficiaries — is the difference between information and accountability. The first reassures; the second reforms.
Tanzania cancelled 40 mining exploration licenses and put another 43 license holders on notice in a 2026 crackdown linked to the government’s “Mining for a Brighter Tomorrow” program. The announcement is significant, but the investigation questions that follow it are equally important: who held those licenses, what was the nature of the non-compliance, what was the relationship between license holders and enforcement officials during the period of non-compliance, and what happened to any minerals extracted during that period? These are questions that official press releases do not answer and that require investigative reporting to address.
Contract Secrecy: The Investigation That Cannot Happen Without the Documents
At the foundation of most mining investigation is a basic problem: the documents that would allow journalists to determine whether Tanzania is receiving a fair deal from its mineral resources are not publicly available in the form required to make that determination.
Tanzania’s EITI commitment requires the disclosure of full mining contract texts. In practice, the government has published summaries of three contracts — redacted versions that contain what the government and companies agree to share rather than the complete terms that independent analysis requires. The gap between this practice and the standard Tanzania has formally committed to is itself a story, but it is also a structural barrier to the deeper investigation it prevents.
What full contract disclosure would enable: analysis of stability clauses that limit Tanzania’s ability to revise fiscal terms in response to changed circumstances; identification of side agreements that modify publicly stated royalty and tax rates; comparison of the terms Tanzania receives with those granted by other African governments for comparable mineral assets; and evaluation of environmental and community obligation provisions that are frequently the weakest elements of mining agreements and the most rarely enforced.
Without the documents, investigation of contract terms relies on leaked materials, comparative analysis of publicly available information from company filings in their home jurisdictions, and the patient accumulation of partial information across multiple sources. This is investigative work of genuine difficulty — and it is precisely the work that the narrowing of civic space and the reduction in funding for independent journalism makes progressively harder to sustain.
The Licence Corruption Problem
The 454 new mining licenses issued between July 2025 and March 2026 — for graphite, nickel, cobalt, lithium, heavy mineral sands, and rare earth elements — represent a licensing pace that creates investigation opportunity alongside the investment opportunity it is intended to generate.
Mining license corruption — the allocation of licenses through patronage relationships rather than merit, the granting of overlapping licenses that create legal disputes and facilitate conflict, the issuance of licenses in ecologically sensitive areas in exchange for payments that never reach government accounts — is one of the best-documented governance failures across African mining jurisdictions. Tanzania is not immune. The 2017 reforms that reorganised the licensing framework were partly motivated by documented failures in the previous system. But reform of a licensing framework does not automatically eliminate the incentive structures that generate corruption within it.
At a licensing pace of 454 permits in nine months, the capacity of oversight systems to evaluate each application adequately, conduct meaningful environmental pre-assessment, and verify that applicants meet qualification requirements is strained. This creates conditions in which procedural shortcuts become normalised, and shortcuts in licensing processes create the information gaps that corruption requires. Tracking who receives licenses — the beneficial owners behind corporate applicants, the relationships between license holders and government officials, the consistency between licensing decisions and stated policy priorities — is investigative work that requires access to corporate registry data, land registry records, and licensing databases that are not always integrated or publicly accessible.
The Artisanal Miner: The Subject Most Investigations Struggle to Reach
Tanzania’s 1.5 million artisanal and small-scale miners are simultaneously the most economically significant unregulated actors in the country’s mineral economy and the people most difficult for formal journalism to reach, represent accurately, and serve with accountability reporting.
The ASGM community is not monolithic. It includes subsistence miners working individual claims with hand tools, semi-mechanised operations using equipment financed through pre-financing arrangements, and larger informal operations that blur the boundary between artisanal and small-scale and medium-scale mining. It includes women processing ore at amalgamation sites, children working in conditions that violate both Tanzanian law and international standards, and experienced miners who have operated in the sector for decades and whose technical knowledge of specific deposits sometimes exceeds that of formal exploration companies.
Reaching this community with reporting that serves their interests — rather than simply using them as evidence in arguments about formal sector policy — requires language access, physical presence in remote mining areas, the trust that comes from sustained engagement rather than episodic visits, and editorial frameworks that treat ASGM workers as sources with expertise rather than as victims with grievances. These are not impossible conditions to meet, but they require resources and commitment that mining journalism rarely receives.
The pre-financing system that ties many ASGM workers to specific mineral traders — receiving tools, food, and fuel in exchange for the obligation to sell gold to the financier at below-market prices — is one of the most significant structural inequities in Tanzania’s informal mineral economy. It creates debt dependency, suppresses miner income, and generates the opacity that allows mercury traders and gold smugglers to operate within legitimate-appearing commercial frameworks. Investigating this system requires sources within it — traders, financiers, miners who have exited — and the trust infrastructure to reach them.
Environmental Crime Investigation: Where Ecology and Accountability Intersect
Tanzania’s National Environment Management Council (NEMC) received expanded enforcement authority in 2025. The government revoked 40 mineral prospecting licenses for environmental non-compliance. The 2026 Budget expanded NEMC’s mandate. These are formal governance developments — but the gap between formal authority and effective enforcement is precisely what environmental investigation attempts to document.
What environmental crime investigation in Tanzania’s extractive sector actually looks like: water sampling downstream of tailings storage facilities to document contamination levels that company environmental reports do not acknowledge; documentation of vegetation clearance beyond approved boundaries; tracking of waste rock disposal in locations that violate permit conditions; identifying the relationship between documented environmental violations and the enforcement decisions — or non-decisions — of the regulatory agency responsible for them.
The training program conducted by Source International and church partners in Nyamongo in May 2025 — teaching community members to use portable field probes for water quality measurement — represents a model for community-based environmental monitoring that generates investigation-quality data without requiring professional journalism infrastructure. When sampling activities were postponed due to political instability ahead of national elections, it also illustrated how political context shapes the conditions under which environmental accountability work can proceed. Even monitoring tools in the hands of trained community members cannot function when the political environment makes their deployment risky for the people holding them.
What Makes Mining Investigation Possible — and What Is Eroding It
The conditions that enable sustained mining investigation are well understood even where they are not consistently present: legal frameworks with meaningful press freedom protections and public interest defences for journalists, access to government information including contracts and license registers, funding sources that are independent of the interests being investigated, physical safety for reporters working in remote and politically sensitive areas, and institutional support — editorial, legal, and security — for journalists pursuing investigations that generate pressure from powerful actors.
In Tanzania’s current environment, several of these conditions are under pressure. The civic space in which civil society and investigative journalism operate has narrowed relative to the reform period of 2008 to 2010. Western funding for independent journalism and civil society in Tanzania has declined — particularly from governments whose stated commitment to transparency in African extractive sectors has not been matched by their funding decisions in the face of domestic budget pressures. The EITI placed Tanzania on enhanced monitoring following electoral violence — a signal that the governance environment for accountability work has deteriorated rather than improved even as the extractive sector itself has expanded.
The paradox at the centre of this situation deserves to be stated clearly: the countries and companies most actively investing in Tanzania’s critical minerals — and loudest in their rhetoric about responsible supply chains and ESG standards — are simultaneously reducing the funding that makes independent accountability journalism about those supply chains possible. The ESG commitments that appear in investor presentations and supply chain policies require, for their credibility, independent verification of whether they are being implemented. That verification function is performed, in practice, by investigative journalists and civil society researchers — whose institutional survival depends on funding that the same investors and governments are cutting.
The Investigation Agenda: What Most Needs to Be Reported
Not all investigations are equally valuable. Given the constraints on investigative capacity in Tanzania’s extractive sector, prioritisation matters. The following are the investigation areas that the evidence suggests are most consequential and most underreported:
The beneficial ownership of mining licenses — who actually controls the companies holding the 454 recently issued critical mineral licenses, whether any are linked to politically exposed persons, and whether beneficial ownership registries are functioning as intended — is a foundational accountability gap that enables multiple downstream problems including corruption in licensing and tax evasion through opaque corporate structures.
The pre-financing system in ASGM — its structure, its principal beneficiaries, its relationship to mercury supply chains and gold smuggling networks — represents the most significant unaddressed investigation gap in Tanzania’s informal mineral economy.
Contract terms — the full texts of the Framework Agreements under which Tanzania’s largest mining operations are governed — remain unpublished in violation of Tanzania’s EITI commitments and represent the most basic transparency deficit in the formal sector.
The relationship between police deployment to mine sites and violence against community members — documented at North Mara but inadequately followed to its institutional roots in the formal agreements between mining companies and the state security apparatus — requires the kind of sustained investigation that international human rights organisations have begun but that domestic investigative journalism is best positioned to continue.
And the environmental monitoring data — water quality near tailings facilities, mercury levels in river systems adjacent to ASGM areas, air quality around graphite processing operations — that is generated by community monitoring programs, academic researchers, and regulatory agencies but rarely synthesised into the accessible public record that policy accountability requires.
Frequently Asked Questions
What makes mining investigation in Tanzania particularly difficult?
Several factors compound the challenge. Cybercrime legislation allows criminal charges against journalists for publishing information deemed inaccurate, without a robust public interest defence. Mine sites are physically remote and access is often restricted. Companies have legal and communications resources that individual reporters cannot match. Communities most affected are frequently too economically vulnerable to speak on record without risk to their livelihoods. And the funding environment for independent investigative journalism in Tanzania has deteriorated as Western donors have reduced development aid while simultaneously increasing their commercial engagement with the mining sector.
What happened at North Mara Gold Mine and why does it matter?
North Mara is Tanzania’s most extensively documented case of mining-related human rights and environmental concerns. Since February 2024, police have been credibly implicated in killing at least six people during clashes at the mine. A leaked agreement shows that the government provides approximately 152 police officers to the mine under a corporate security arrangement. International investigations by Forbidden Stories documented that at least a dozen journalists who reported on North Mara have been censored or threatened. The case is significant because it illustrates the systematic nature of the pressures that suppress accountability reporting across Tanzania’s mining sector.
How serious is mercury contamination from artisanal gold mining in Tanzania?
Extremely serious and substantially under-documented. An estimated 1.5 million artisanal and small-scale gold miners in Tanzania use mercury amalgamation as their primary gold recovery method. Approximately 10 to 15 tonnes of mercury is burned or discharged annually into rivers and soils in mining regions including Geita, Shinyanga, and Mbeya. Mercury accumulates in aquatic food chains, affecting communities dependent on fish. Despite Tanzania ratifying the Minamata Convention in 2017 and developing a National Action Plan, mercury use in the sector has not materially declined. The brokers who supply mercury through pre-financing arrangements with miners represent a largely uninvestigated network at the centre of this problem.
What is mineral smuggling and how much does Tanzania lose to it?
Mineral smuggling refers to the export of gold and other minerals from Tanzania without payment of the royalties, corporate taxes, and export levies that formal production channels attract. Tanzania’s own estimates suggest losses of approximately $500 million annually. Regional arbitrage — particularly the lower export levies maintained by neighbouring Rwanda — creates financial incentives for informal traders to move gold across borders before export. Between July 2025 and March 2026, the government seized minerals worth TZS 3.3 billion in 55 anti-smuggling operations. The investigations that would identify the networks, financiers, and potentially complicit officials behind the trade have largely not been published.
Why does contract secrecy matter for mining accountability?
The terms of mining contracts — royalty rates, tax stability clauses, local content obligations, environmental bond requirements, and any side agreements that modify standard terms — determine how much benefit Tanzania actually extracts from its mineral wealth. Without access to full contract texts, independent analysts cannot determine whether Tanzania is negotiating adequately, whether stability clauses prevent the government from adjusting terms as circumstances change, or whether commitments to communities and environmental protection are enforceable or cosmetic. Tanzania’s EITI commitment requires disclosure of full contract texts, but the government has published only summaries of three contracts — a practice that falls short of the transparency standard Tanzania has formally agreed to meet.
What is the pre-financing system in artisanal mining and why is it problematic?
Pre-financing is an arrangement in which mineral traders or brokers provide artisanal miners with tools, food, fuel, and supplies in advance, in exchange for the obligation to sell gold to the financier at prices typically below market rates. The system creates debt dependency that traps miners in relationships they cannot easily exit. It also generates the opacity that allows mercury traders and gold smugglers to operate within formally legitimate commercial frameworks — making it difficult for regulators to distinguish legal informal mining from networks facilitating environmental crime and revenue evasion. The pre-financing system is one of the most significant and least investigated structural features of Tanzania’s informal mineral economy.
How is community-based environmental monitoring used in mining investigations?
Community-based environmental monitoring involves training community members — often through civil society organisations or faith-based networks — to use scientific instruments to measure water quality, air quality, and other environmental indicators near mining sites. In Nyamongo, near North Mara, Source International and church partners trained local faith leaders to use multiparametric field probes for water quality testing in 2025, leaving equipment with the community for ongoing independent monitoring. This approach generates investigation-quality data in locations where formal journalism cannot maintain continuous presence, and creates a body of locally-produced evidence that complements reporting from external researchers and journalists.
What would full contract transparency in Tanzania’s mining sector change?
Full public disclosure of the contracts governing Tanzania’s large mining operations would enable independent analysis of whether the fiscal terms Tanzania receives are consistent with comparable agreements in peer countries; whether stability clauses restrict the government’s ability to respond to changed economic or environmental conditions; whether community development obligations are legally enforceable or merely advisory; and whether any side agreements modify the publicly stated terms of operation. This information is prerequisite for informed parliamentary debate, civil society advocacy, and investigative journalism about whether Tanzania’s mineral wealth is being managed in the public interest. Its current absence is the most fundamental transparency deficit in Tanzania’s extractive governance.