Ghana Onshore: Screening Frontier Basins and Covered Gold Belts

01 · The challenge

Why Ghana, and why now

Ghana faces two exploration problems at once.

• Oil. Offshore oil output is falling [1][3], and the country is turning inland to a frontier basin that has barely been drilled [1][2].
• Gold. Gold output hit a record in 2025 [9], but worldwide the industry is finding fewer and smaller new deposits [10][11].

Both problems come down to one question. Where should the next exploration dollar go, and where should the next well or drill hole be placed?

Use case 1

Frontier hydrocarbons onshore

The challenge

• Size. The Voltaian Basin covers about 103,000 km², around 40% of Ghana's land area, and is its largest sedimentary basin [2][3].
• Depth. Its sediments are about 6,000 m thick in the deepest part [1][4].
• Wells. Apart from one unsuccessful wildcat well drilled in 1977, no wells have been drilled [1]. In the 1960s, water boreholes met traces of oil and gas [1][5].
• An undefined petroleum system. The Ghana National Petroleum Corporation (GNPC) reports organic-rich shales and significant sediment thickness [6]. A 2022 review still describes the basin's petroleum play system as "yet to be clearly defined" [7].

For more than a decade, GNPC and its exploration subsidiary have run a programme to de-risk the basin [1]. Public estimates of data spending range from about US$150 million to US$200 million [3][6][8]. A drilling target first set for 2025 has slipped [8]. Several companies hold exploration licences in the basin [3][13].

The first modern well: TUA-1X

In September 2026, site works for GNPC's TUA-1X exploration well at Chegu, in the Mion District, were under way, including a 13.5 km access road, a rig pad and a base camp [2]. Drilling is targeted for late 2026 to early 2027 [3][12]. Officials stress that the preparations do not mean commercial oil or gas has been found, and that the well is valuable for its data whatever the result [2]. Once it is drilled, the regulator plans to invite bids for further acreage [13].

Onshore Keta

The onshore Accra–Keta Basin covers about 1,900 km² of a 33,900 km² basin. Published studies suggest a working Cretaceous petroleum system there [4]. A 2016 onshore Keta Delta licence was described as Ghana's first onshore oil exploration agreement [14]. We found no public source for its current status.

The commercial pressure

• Falling production. Crude production fell from 71.4 million barrels in 2019 to a projected 36 million in 2026 [3][8].
• Long lead time. One Ghanaian think tank does not expect Voltaian production before 2033–2036, even after a discovery [3].

Why satellite remote sensing fits

MicMak's satellite remote sensing works from orbit, with no field crews and no environmental or HSE footprint on site. According to MicMak's published specifications, it:

• maps anomalies linked to hydrocarbon accumulations;
• estimates depth and thickness from multi-angle satellite imagery;
• maps tectonic faults.

MicMak states a proven hydrocarbon depth of 6,200 m, which spans the basin's sediment thickness [4]. That makes it a natural first screen for ranking very large, data-poor acreage before seismic infill or well commitments are made.

Use case 2

Gold in the Birimian belts

The challenge

• A world-class province. Ghana's gold is mainly hosted in the Birimian Supergroup and Tarkwaian Group. These form southwest-to-northeast belts, in which lode gold was deposited along fault and shear zones [15][16].
• Record output. Ghana produced a record of about 5.94 million ounces in 2025 [9].
• A structural shift. Small-scale mining supplied 52.4% of that output, overtaking large-scale mining for the first time in more than 100 years. Large-scale output slipped [9].
• Replacing ore. The Ghana Chamber of Mines has called for more exploration investment to replace depleting ore [9].

Globally, the picture is tightening.

• Fewer and smaller finds. There were no major discoveries in 2023–24, and the average new deposit fell to 4.4 Moz from 7.7 Moz [10].
• Less grassroots spending. Grassroots spending fell to a record-low 18% share of gold exploration budgets in 2025 [11].
• West Africa still delivers. It has produced more than 70 Moz of discoveries in 15 years, despite much lower spending than Canada, the US or Australia [17].

In Ghana, the obstacle is often what lies on top.

• Little outcrop. Outcrops are rare across much of the Birimian because of deep weathering and laterite [18].
• Misleading regolith. Complex regolith has been called "a major cause of the failure of gold exploration" in northern Ghana [19].
• Magnetics maps the controls. Published studies show that magnetic data can map the shear zones and contacts that control gold beneath this cover [18][20].

Why remote sensing plus aerotomography fits

Regional screening. MicMak's remote sensing also targets deposits of metals and minerals. MicMak states a proven solid-mineral depth of 1,000 m and detection of mineral layers thicker than 1 m.

Prospect-scale follow-up. MicMak's drone magnetic aerotomography (used for solid minerals only) adds detail on ranked zones.

• Coverage. MicMak states it flies any terrain and reaches targets 500 m deep and more.
• Vector data. Its drone magnetometers record the magnetic field in X, Y and Z, which helps locate bodies and estimate their depth, size and susceptibility.
• Noise. MicMak's published system noise is ±0.2 nT.
• Outputs. It produces a 3D susceptibility model, fault analysis and anomalies ranked by size and shape.

02 · Our approach

Method

Remote sensing

1. Inputs. Area coordinates, the target, and samples from the area or nearby.
2. Analysis. Samples from the area are analysed and matched against satellite imagery, and anomalies are mapped with depth estimated from multi-angle imagery.
3. Report. The report gives maps, depths, faults, well locations and a resource appraisal.

Aerotomography

1. Plan. An elevation map and the drone routes are prepared.
2. Fly. The drone magnetometry survey is flown at two altitudes, plus a gradient survey.
3. Verify. Data is checked in the field on crossing profiles.
4. Process. Vector inversion builds the 3D model.
5. Report. The report gives maps, the model, faults and ranked anomalies.

03 · What we'd deliver

Illustrative pilot scope (not a proposal)

MicMak recommends starting with one block where existing data allows a like-for-like comparison.

Deliverables

• Remote sensing. Presence of target minerals or fluids, anomaly maps, the depth and thickness of each layer, mapped faults, recommended well locations, and a conservative preliminary resource appraisal.
• Aerotomography. Magnetic field, vector, gradient and dispersion maps, a 3D susceptibility model, fault and rock-age vector analysis, ranked anomalies, and the full vector data set.

04 · Limits

Limits, stated plainly

• Accuracy. MicMak reports its remote-sensing results at 60–70% statistical accuracy. The resource appraisal is a conservative minimum, not a reserve estimate.
• Thresholds. According to MicMak's published specifications, minimum detectable thickness is more than 5 m for oil and more than 10 m for gas, and anomaly position can deviate by ±50 m.
• Little local control. The Voltaian has almost no wells [1], so there is little local data to compare results against. Results there are screening, to be integrated with seismic and drilling. No single method is enough on its own.
• Samples. Samples from the area or nearby are required.
• Gold is targeted indirectly. Aerotomography maps the structures and rocks that host gold [15][18][20]. It does not detect gold itself. It is used for solid minerals only, and flights need local permissions and access.

References

Sources

All sources are publicly available. Numbers in square brackets in the text refer to this list.

1. GeoExpro, "Ghana's next frontier: The Voltaian Basin", 13 Aug 2026. https://geoexpro.com/ghanas-next-frontier-the-voltaian-basin/
2. Ghana News Agency, "GNPC advances Voltaian Basin exploration towards TUA-1X Well at Chegu", 18 Sep 2026. https://gna.org.gh/2026/09/gnpc-advances-voltaian-basin-exploration-towards-tua-1x-well-at-chegu/
3. Ecofin Agency, "Ghana Seeks Canadian Partners to Unlock Oil Potential in Volta Basin", 15 Jun 2026. https://www.ecofinagency.com/news-industry/1506-56459-ghana-seeks-canadian-partners-to-unlock-oil-potential-in-volta-basin
4. Petroleum Commission Ghana, "Sedimentary Basins", accessed 23 Oct 2026. https://petrocom.gov.gh/sedimentary-basins/
5. Adda, G.W. (2013), "The Petroleum Geology and Prospectivity of the Neo-Proterozoic, Paleozoic and Cretaceous Sedimentary Basins in Ghana", AAPG Search and Discovery #10544. https://www.searchanddiscovery.com/documents/2013/10544adda/ndx_adda.pdf
6. GNPC, "GNPC Sets 2025 for First Exploration Well in the Voltaian Basin", 2024. https://www.gnpcghana.com/news/gnpc-sets-2025-for-first-exploration-well-in-the-voltaian-basin
7. "A review on the provenance of the Voltaian Basin, Ghana: Implications for hydrocarbon prospectivity", Scientific African, 2022. https://doi.org/10.1016/j.sciaf.2022.e01429
8. Surveillance Ghana (via thebftonline.com), "GNPC Confirms Q4 Target for Onshore Drilling in Voltaian Basin Despite Delays", accessed 23 Oct 2026. https://www.surveillanceghana.com/gnpc-confirms-q4-target-for-onshore-drilling-in-voltaian-basin-despite-delays/
9. GhanaWeb, "Small-scale mining records highest output in over 100 years", 18 Aug 2026. https://www.ghanaweb.com/GhanaHomePage/business/Small-scale-mining-records-highest-output-in-over-100-years-2048224
10. MINING.COM, "Gold exploration spend trending down despite higher prices – S&P Global", 10 Aug 2025. https://www.mining.com/fewer-grassroots-projects-smaller-discoveries-a-recurring-theme-in-gold-sector-sp-global/
11. S&P Global Market Intelligence, "Gold Exploration Budgets Rise on Record Prices; Risks Remain", Jun 2026. https://www.spglobal.com/market-intelligence/en/news-insights/research/2026/06/gold-exploration-trends-record-prices-grassroots-risk-2026
12. GBC Ghana Online, "First Exploration Well in Voltaian Basin Expected Before Year-End – Petroleum Commission", 24 Sep 2026. https://www.gbcghanaonline.com/general/first-exploration-well-in-voltaian-basin/2026/
13. 3News, "GNPC to drill two exploration wells in Voltaian basin by third quarter of 2026 – Petroleum Commission CEO", 31 Oct 2025. https://www.3news.com/business/gnpc-to-drill-two-exploration-well-in-voltaian-basin-by-third-quarter-of-2026-petroleum-commission-ceo
14. MyJoyOnline, "Keta oil and gas exploration deal 'finalised'", 3 Apr 2016. https://www.myjoyonline.com/keta-oil-and-gas-exploration-deal-finalised/
15. "Assessing the impact of Ghana's geology on gold mining using geospatial techniques", Heliyon, 2025 (open access). https://pmc.ncbi.nlm.nih.gov/articles/PMC11904583/
16. Eisenlohr, B.N. (1992), "Conflicting evidence on the timing of mesothermal and paleoplacer gold mineralisation in early Proterozoic rocks from Southwest Ghana", Mineralium Deposita 27. https://link.springer.com/article/10.1007/BF00196077
17. MINING.COM, "SCP sees West Africa explorers nearing 'sweet spot'" (citing S&P Market Intelligence data), 13 Jul 2025. https://www.mining.com/scp-sees-west-africa-explorers-nearing-sweet-spot/
18. Atta, S.K. (2023), "Mapping subsurface geological structures in the Birimian Supergroup, Ghana using airborne magnetic and radiometric data", Journal of African Earth Sciences 205. https://doi.org/10.1016/j.jafrearsci.2023.105003
19. Arhin, E. & Nude, P.M. (2009), "Significance of regolith mapping and its implication for gold exploration in northern Ghana", Geochemistry: Exploration, Environment, Analysis. https://doi.org/10.1144/1467-7873/08-189
20. Wemegah, D.D. et al. (2015), "Geophysical Interpretation of Possible Gold Mineralization Zones in Kyerano, South-Western Ghana Using Aeromagnetic and Radiometric Datasets". https://file.scirp.org/Html/8-2170024_57659.htm

This analysis is based solely on publicly available information. It does not reflect feedback from, or data provided by, any partner or client.