Reviewed August 2026 against Defra’s Water and Abandoned Metal Mines target delivery plan, Macklin et al. (Science, 2023) and Sudan’s Ministry of Minerals output statements.

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Sudan’s gold comes from four broad zones — the Red Sea Hills around the Ariab district, the Nile corridor through Northern and River Nile states, the Blue Nile and Kordofan basement belts, and Jebel Amer in North Darfur — and Sudan’s Ministry of Minerals reported 70 tonnes of output for calendar 2025, against 64 tonnes for 2024. The second half of this query pairs awkwardly with the first, and that is the useful part: classic acid mine drainage is a wet-climate, sulphide-rich, long-abandoned-workings problem, and the best-documented hotspots sit in the northern Pennines of England and the coal fields of Pennsylvania — not in Sudan’s arid artisanal camps, where mercury and cyanide in tailings are the sharper hazard. Below are both maps, every figure with its vintage, and the method to get a fresher number than the one printed here.

Table of Contents

1. Where Sudan’s gold actually comes from
2. What the reported tonnage does and does not tell you
3. Is acid mine drainage really Sudan’s water problem?
4. Global acid mine drainage hotspots: the documented record
5. Calculator: mine-water metal load and treatment benefit
6. Gold detectors, ground crews and satellites
7. A screening method that survives the figures
8. Satellite screening with Farmonaut
9. FAQ

Where Sudan’s Gold Actually Comes From

The US International Trade Administration’s Sudan Country Commercial Guide (dated July 2022) places large company operations “primarily in Northern, Red Sea, and West Kordofan states”, records exports of 25.2 tonnes in 2020 and 26.4 tonnes over the first nine months of 2021, and states plainly that government estimates put around 80% of Sudan’s gold as smuggled abroad. That last figure is the single most important number on this page, because it means any district ranking built purely on official output is ranking paperwork, not geology.

The table below separates what is documented from what is inferred. Treat the right-hand column as your homework list rather than as a citation.

Note on an older version of this page: earlier drafts listed an “Issa Gold Belt (Gedaref/Kassala)” with tonne-level output estimates. Those figures had no traceable source and have been removed rather than restated.

What the Reported Tonnage Does and Does Not Tell You

Sudan’s Ministry of Minerals reported 70 tonnes of gold for 2025, 13% above its own target, following 64 tonnes in 2024, and put mining-sector public revenue at about SDG 1.087 trillion (roughly $1.8 billion) for 2025, as reported on 29 December 2025. Three caveats matter more than the headline:

• It is a ministry self-report, not an audited figure. Sudan is not an EITI implementing country, so there is no independent reconciliation of company payments against government receipts.
• It excludes what the state does not control. Output from areas held by the Rapid Support Forces or other armed groups does not pass through the official channel.
• Production and export figures are different animals. With smuggling estimated at 80% by Sudan’s own government, officially exported tonnage will always sit far below reported production.
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Set that 9.4% output rise against the gold price. The LBMA Precious Metals Market Report for Q4 and full-year 2025 records the LBMA Gold Price up 62.90% across 2025, from a low of $2,631.80 (6 January a.m.) to a high of $4,481.85 (23 December a.m.). Reported tonnage grew a fraction as fast as the incentive to dig.

Is Acid Mine Drainage Really Sudan’s Water Problem?

Acid mine drainage forms when sulphide minerals — pyrite above all — are exposed to oxygen and water, generating sulphuric acid that mobilises iron, aluminium, zinc, cadmium, lead and arsenic. The Susquehanna River Basin Commission notes such drainage can be 10,000 times more acidic than neutral water. Three conditions drive it: sulphide-rich rock or spoil, sustained water throughput, and abandoned workings that keep discharging long after the operator has gone.

Sudan’s gold districts meet the first condition — the Red Sea Hills gossans sit directly over sulphide protolith — but only partially meet the second and third. Rainfall in the Nile corridor and Red Sea Hills is low and highly seasonal, and much artisanal activity is shallow and eluvial rather than deep sulphide workings with permanent adit discharge. The hazard profile differs accordingly:

The honest position: no published, peer-reviewed monitoring dataset quantifies AMD loading in Sudanese gold districts at catchment scale. Anyone quoting a percentage of Sudanese water sources “contaminated by AMD” is quoting nothing. What you can do is run the screening in the method section below on your own licence area and generate a defensible local number.

Global Acid Mine Drainage Hotspots: The Documented Record

The most rigorous global figure comes from Macklin et al., Impacts of metal mining on river systems: a global assessment, published in Science (vol. 381, issue 6664, pp. 1345–1350) on 22 September 2023 and catalogued by Aberystwyth University. Using a georeferenced database of known metal mines and tailings facilities, the team estimated that metal mining affects 479,200 km of river channels and 164,000 km² of floodplains, with 23 million people living on affected floodplains — a population roughly 50 times larger than the number directly affected by tailings dam failures. The contaminants modelled were lead, zinc, copper and arsenic.

England: 1,491 km and a statutory deadline

England has the rare distinction of a legally binding cleanup target. The Water and Abandoned Metal Mines Environment Act target delivery plan sets a baseline of 1,491 km of rivers polluted by harmful metals from abandoned metal mines and commits to halving that length by 2038. Its interim milestones for December 2030 are 8 mine water treatment schemes, 20 diffuse interventions and 55 catchment studies; the plan records 2 schemes constructed, 20 diffuse interventions delivered and 5 catchment studies completed at the point of publication.

What one scheme buys is instructive. The £9 million Nent Haggs scheme near Alston, announced by Defra on 20 September 2023, captures mine water at Nentsberry, pumps it 2.5 km to treatment ponds and reed beds at West Foreshield, and is expected to strip over 90% of the metals from a discharge carrying about 3 tonnes of zinc a year into the River Nent. The Environment Agency’s own account of Britain’s metal pollution legacy (6 June 2023) puts the affected reach at up to 60 km of the River South Tyne, with metal concentrations reaching up to 200 times the level considered safe for wildlife, and describes an eventual programme of around 40 treatment schemes. The Saltburn scheme in East Cleveland has run since 2015.

Pennsylvania: the largest single AMD burden in the United States

Pennsylvania’s Department of Community and Economic Development states that abandoned mine drainage impairs over 5,500 miles of streams in the Commonwealth — about 8,850 km, six times England’s metal-mine total. Its Abandoned Mine Drainage Abatement and Treatment Program, funded from the Marcellus Legacy Fund under Act 13 of 2012, awards grants of up to $1,000,000 with a minimum 15% applicant match. Scale of remedy: the Tioga River plant described by the Susquehanna River Basin Commission will treat just over 5 million gallons per day and is intended to restore more than 20 miles of stream. For the federal picture, the inventory to consult is OSMRE’s e-AMLIS, which records the location, type and extent of abandoned mine land problems together with reclamation cost — but only direct construction cost, excluding planning, design, permitting and oversight. It is updated as problems are identified and reclaimed, so query it rather than quoting any snapshot.

Calculator: Mine-Water Metal Load and Treatment Benefit

Enter your own adit or seepage measurements to see the annual metal load, what a Nent Haggs-style scheme would remove, and the concentration after mixing with the receiving watercourse.

Gold Detectors, Ground Crews and Satellites

Searches for the best gold detectors and searches for gold mining hotspots are the same impulse at two different scales, and the instruments are not substitutes. A hand-held detector responds to a metallic target within the top few tens of centimetres of soil; a pulse-induction machine with a large coil reaches deeper than a VLF machine in mineralised ground, but neither maps alteration, and neither finds a deposit — it finds a nugget in ground someone has already established as auriferous.

There is an honest gap here worth stating: no regulator or standards body publishes comparative detection-depth tables for consumer detectors, and manufacturer depth claims are made under conditions that rarely match red lateritic or highly conductive ground. The only defensible comparison is one you run yourself — bury targets of known mass at measured depths in the soil you actually work, and record which machine and coil combination sounds off. That test costs an afternoon and outranks any review list.

Each row narrows the ground for the next. Satellite screening is a filter placed ahead of the expensive steps, not a replacement for them.

A Screening Method That Survives the Figures

Every number above will age. This procedure will not. It is the sequence used to decide whether a given block of ground is a gold target, an acid-drainage liability, or both.

1. Fix the footprint from imagery, not from reports. Take two cloud-free scenes from the same season two or more years apart and digitise pit, spoil and processing-pad polygons on each. The area difference is your expansion rate — a measured one, with dates attached.
2. Map the alteration halo. Iron-oxide and clay band ratios on Sentinel-2 or ASTER separate gossan and sericite–silica alteration from unaltered country rock. In the Arabian–Nubian Shield this is well-established practice, and the same imagery does double duty for the next step.
3. Look for the acid signature in the same scene. Pyrite oxidation deposits secondary iron minerals in roughly concentric zones around waste: jarosite innermost where leachate pH is lowest and metals most mobile, goethite outermost where pH is near neutral. Each is spectrally distinct, so a district can be screened for acid-generating waste before anyone walks it — the approach the USGS demonstrated with AVIRIS data at the California Gulch Superfund site near Leadville, Colorado.
4. Rank by water pathway, not by anomaly strength. Overlay your polygons on a drainage network and identify every downstream abstraction point within the catchment. A weak anomaly upstream of a village well outranks a strong one in a closed basin.
5. Measure before you model. Field pH and conductivity at each discharge, paste-pH and a net-acid-generation test on spoil, and a suspended-solids pair upstream and downstream. Feed the flow and concentration into the calculator above.
6. Re-run on a fixed cadence. Annually at minimum, quarterly where artisanal activity is expanding. Save the polygons and the raw numbers; the trend is worth more than any single survey.

Satellite Screening with Farmonaut

Farmonaut runs steps 1 to 3 of that method as a service. Multispectral and hyperspectral imagery is processed into mineralised-target zones, structural interpretation and alteration mapping across a licence block, with no ground disturbance and no field crew mobilised — which is the entire point when the alternative is flying people into a district where access and security are constrained.

• 🌏 How satellite-based mineral detection narrows a licence block before drilling — regional screening, alteration mapping and target ranking from orbit.
• 🎯 TargetMax™ drilling intelligence: satellite-driven 3D mineral prospectivity mapping, for ranking drill targets once surface screening is complete.
• 🗺️ Map Your Mining Site Here

Turnaround runs 5–20 business days depending on block size and imagery availability, and the same imagery stack that identifies targets also gives you the baseline footprint for step 1 of the monitoring method. To scope a block, use the mining query form, or contact us directly. Farmonaut is not a regulator and issues no approvals; what it produces is evidence you can take into a permitting or community conversation.

Frequently Asked Questions

Which are Sudan's main gold mining districts?

Company operations are concentrated in Northern, Red Sea and West Kordofan states according to the US ITA Country Commercial Guide dated July 2022, with the Red Sea Hills / Ariab district the best documented geologically. Jebel Amer in North Darfur is named in the June 2023 OFAC designation of Al Junaid Multi Activities Co. Ltd. Artisanal activity extends well beyond these into the Blue Nile and wider Kordofan basement.

How much gold does Sudan produce?

Sudan's Ministry of Minerals reported 70 tonnes for 2025 and 64 tonnes for 2024. These are self-reported figures that exclude output from areas outside government control, and Sudan's own government has estimated that around 80% of the country's gold is smuggled abroad.

Where are the world's worst acid mine drainage hotspots?

By documented river length, Pennsylvania leads in the US with over 5,500 miles of impaired streams, and England has a statutory baseline of 1,491 km affected by abandoned metal mines. Globally, Macklin et al. (Science, 2023) put metal-mining impact at 479,200 km of river channel and 164,000 km² of floodplain, with 23 million people living on affected floodplains.

Does Sudan have an acid mine drainage problem?

The sulphide geology is there, but no peer-reviewed catchment-scale monitoring dataset quantifies AMD loading in Sudanese gold districts. In arid artisanal camps, mercury from amalgamation and cyanide from tailings reprocessing are the better-evidenced hazards. Any specific percentage claim about Sudanese water contamination by AMD should be treated as unsourced.

Can a metal detector find a gold deposit?

No. Detectors find nuggets in ground already known to be auriferous, within the top few tens of centimetres. Finding the ground itself is a job for geochemistry and alteration mapping. Bury known targets at measured depths in your own soil to compare machines — manufacturer depth claims rarely hold in conductive or lateritic ground.

How do I check whether a discharge near my site matters?

Measure the flow rate and dissolved metal concentration, put both into the calculator above, and compare the annual load against the roughly 3 tonnes of zinc per year that justified a £9 million treatment scheme on the River Nent. Then check what is abstracted downstream.