The Esaase gold deposit is located in the Asankrangwa gold belt and within the Paleoproterozoic Birimian Supergroup of the Kumasi basin. The deposit represents an important example of a structurally controlled turbidite-hosted gold system. Despite its economic significance, the geochemical processes controlling the element mobility during mineralisation remain poorly understood. This study presents an integrated petrographic and mass balance investigation of the Esaase gold deposit to characterise alteration processes and quantify the elemental mass transfer associated with the hydrothermal mineralisation. Petrographic studies revealed two major stages: (I) metamorphic and (II) hydrothermal. Stage II is associated with gold mineralisation. Metamorphic alteration is characterised by fine-grained sericite, chlorite, paragonite, and albite, while hydrothermal alteration is characterised by coarse-grained sericite, chlorite, carbonates, quartz, albite, paragonite, pyrite, arsenopyrite, and traces of chalcopyrite and gold. (Na2O/Al3O2 vs. K2O/Al3O2) Isocon-based mass balance calculations reveal a net mass gain of 16.67%, with significant enrichment in Au, As, Sb, Bi, Pb, Te, Se, Sb, Cr, Ni, and Cu, and marked depletion in Cao without significant changes in K2O and Na2O. These geochemical trends reflect localised but efficient fluid-rock interaction along structurally controlled hydrothermal pathways. The alteration assemblages are dominated by sericite-chlorite over sericite-albite, as supported by alkali-alumina molar ratios (Na2O/Al3O2 vs. K2O/Al3O2), consistent with alteration haloes surrounding sheeted quartz-carbonate veins. The deposit geology, alteration mineralogy, and lithogeochemistry of the Esaase turbidite-hosted gold deposit are similar to other world-class turbidite-hosted gold deposits, such as Bendigo in Australia, Meguma in Canada, Reefton in New Zealand, and Shangxu in China. This study establishes the quantitative mass balance assessment of the hydrothermal alteration at Esaase, demonstrating how moderate net mass gains reflect structurally controlled fluid flow and mineralisation. The findings provide new constraints on the genetic interpretations and support targeted exploration strategies in the Kumasi basin and similar geological settings.
ZoheirBAQaoudNN. Hydrothermal alteration geochemistry of the Betam gold deposit, South Eastern Desert, Egypt: mass-volume-mineralogical changes and stable isotope systematics. Applied Earth Science2008; 17: 55–76.
2.
WilkinsonJJChangZCookeDR, et al.Chlorite chemistry as a new exploration tool in the propylitic halo of porphyry-epithermal systems: a case study of the Batu Hijau porphyry Cu-Au system, Indonesia. Applied Earth Science2016; 125: 98–99.
3.
De SouzaSDubéBMercier-LangevinP, et al.Hydrothermal alteration mineralogy and geochemistry of the Archean world-class Canadian Malartic disseminated-stockwork gold deposit, southern Abitibi greenstone belt, Quebec, Canada. Econ Geol2019; 114: 1057–1094.
4.
GaillardNWilliams-JonesAEClarkJR, et al.The use of lithogeochemistry in delineating hydrothermal fluid pathways and vectoring towards gold mineralisation in the Malartic district, Québec. Ore Geol Rev2020; 120: 103351.
5.
McFallKRobertsSNadenJ, et al.Hydrothermal transport of PGEs in porphyry systems–a fluid history of the Skouries Cu–Au (PGE) porphyry deposit. Applied Earth Science2017; 126: 79–80.
6.
BierleinFPChristieABSmithPK. A comparison of orogenic gold mineralisation in central Victoria (AUS), western South Island (NZ) and Nova Scotia (CAN): implications for variations in the endowment of Palaeozoic metamorphic terrains. Ore Geol Rev2004; 25: 125–168.
7.
DugdaleALWilsonCJLeaderLD, et al.Carbonate spots: understanding the relationship to gold mineralisation in central Victoria, southeastern Australia. Miner Deposita2009; 44: 205–219.
8.
AmponsahPOSalviSBéziatD, et al.Geology and geochemistry of the shear-hosted Julie gold deposit, NW Ghana. J Afr Earth Sci2015; 112: 505–523.
9.
HamisiJ. Defining the Geochemical Footprint for Gold Mineralisation Around Birthday Reef. Reefton Goldfield. Stockholm University, 2016, 60.
10.
SenyahGADampareSBAsieduDK. Geochemistry and tectonic setting of the Paleoproterozoic metavolcanic rocks from the Chirano Gold District, Sefwi belt, Ghana. J Afr Earth Sci2016; 122: 32–46.
11.
PhillipsGNVearncombedJRAnandeRR, et al.The role of geoscience breakthroughs in gold exploration success: Yilgarn Craton, Australia. Ore Geol Rev2019; 122: 1–58.
12.
MathieuL. Quantifying hydrothermal alteration: a review of methods. Geosciences (Basel)2018; 8: 245.
13.
BarkerSLHoodSHughesRM, et al.The lithogeochemical signatures of hydrothermal alteration in the Waihi epithermal district, New Zealand. New Zealand J Geol Geophys2019; 62: 513–530.
14.
FangXTangJBeaudoinG, et al.Geology, mineralogy, and geochemistry of the Shangxu orogenic gold deposit, central Tibet, China: implications for mineral exploration. Ore Geol Rev2020; 120: 103440.
15.
WeltNJackmanJAdlakhaE, et al.Late-Triassic hydrothermal polymetallic Sb-Pb-As-Zn veins, Meguma Terrane, Canadian Appalachian Orogen; a new critical metal deposit type in Nova Scotia. Characterisation, classification, and mechanisms for mineralisation of critical metal-bearing occurrences in southwestern Meguma Terrane, Canadian Appalachians. 2022; 17: 159.
16.
AtangaFAmponsahPONunooS, et al.The geology and geochemistry of the Rhyacian Josephine gold deposit, Northwest Ghana. Applied Earth Sci2023; 132: 252–270.
17.
ZhangFWilliamsonBJUllmannCV, et al.Chemical changes during endoskarn and porphyry-style alteration and Cu—Fe exoskarn mineralisation in the Tonglushan system, eastern China. Res Geol2023; 73: e12319.
18.
CamposLMToledoCLSilvaAM, et al.The hydrothermal footprint of the Crixás deposit: new vectors for orogenic gold exploration in central Brazil. Ore Geol Rev2022; 146: 104925.
19.
LargeRRBullSWMaslennikovVV. A carbonaceous sedimentary source-rock model for Carlin-type and orogenic gold deposits. Econ Geol2011; 106: 331–358.
20.
WuYFEvansKFisherLA, et al.Distribution of trace elements between carbonaceous matter and sulphides in a sediment-hosted orogenic gold system. Geochim Cosmochim Acta2020; 276: 345–362.
21.
LuqueFJHuizengaJMCrespo-FeoE, et al.Vein graphite deposits: geological settings, origin, and economic significance. Miner Deposita2014; 49: 261–277.
22.
LiHHongTLiuS, et al.Genesis of the graphite from the Tugeman graphite deposit, Xinjiang, China: evidence for carbon isotope refining by fluids associated with the Ductile Shear Zone. Minerals2023; 13: 1328.
23.
PhillipsGNVearncombeJRClemensJD, et al.Formation of Cu–Au porphyry deposits: hydraulic quartz veins, magmatic processes and constraints from chlorine. Australian J Earth Sci2023; 70: 1010–1033.
24.
VearncombeJRPhillipsGNBarnicoatAC, et al.Structural complexity and Witwatersrand gold, South Africa: a synthesis. Australian J Earth Sci2025; 17: 1–36.
25.
MaukJLSimpsonMP. Geochemistry and stable isotope composition of altered rocks at the golden cross epithermal Au-Ag deposit, New Zealand. Econ Geol2007; 102: 841–871.
HirdesWDavisDWEisenlohrBN. Reassessment of Proterozoic granitoid ages in Ghana on the basis of U–Pb zircon and monazite dating. Precambrian Res1992; 56: 89–92.
32.
DavisDWHirdesWSchalteggerE, et al.U/Pb age constraints on deposition and provenance of Birimian and gold-bearing Tarkwaian sediments in Ghana, West Africa. Precambrian Res1994; 67: 89–107.
33.
DampareSShibataTAsieduD, et al.Sr–Nd isotopic compositions of Paleoproterozoic metavolcanic rocks from the southern Ashanti volcanic belt, Ghana. Okayama Univ Earth Sci Report2009; 16: 9–28.
34.
ChudasamaBPorwalAKreuzerOP, et al.Geology, geodynamics and orogenic gold prospectivity modelling of the Paleoproterozoic Kumasi basin, Ghana, West Africa. Ore Geol Rev2016; 78: 692–711.
35.
McFarlaneHBThebaudNParra-AvillaLA, et al.Palaeoproterozoic juvenile crust formation of SW Ghana in the West African Craton: New insights from igneous geochemistry and U-Pb-Hf zircon data. The Geodynamic and Tectonic Evolution of the Palaeoproterozoic Sefwi Greenstone Belt, West African Craton (Ghana)2017; 187.
36.
LeubeAHirdesWMauerR, et al.The early Proterozoic Birimian Super group of Ghana and some aspects of its associated gold mineralisation. Precambrian Res1990; 46: 139–165.
37.
PerroutySAillèresLJessellM, et al.Revised Eburnean geodynamic evolution of the gold-rich southern Ashanti Belt, Ghana, with new field and geophysical evidence of pre-tarkwaian deformations. Precambrian Res2012; 204: 12–39.
38.
SakyiPASuBXManuJ, et al.Origin and tectonic significance of the metavolcanic rocks and mafic enclaves from the Palaeoproterozoic Birimian Terrane, SE West African Craton, Ghana. Geol Mag2020; 157: 1349–1366.
39.
NunooSHofmannAKramersJ. Geology, zircon U–Pb dating and εHf data for the Julie Greenstone belt and associated rocks in NW Ghana: implications for Birimian-to-Tarkwaian correlation and crustal evolution. J Afr Earth Sci2022; 186: 104444.
40.
AgraNAElburgMAVorsterC. Constraints on Paleoproterozoic crustal growth from Birimian Supergroup lavas of the Bui belt (Ghana) in the West African Craton. Precambrian Res2023; 384: 106926.
41.
AttaSK. Mapping subsurface geological structures in the Birimian Supergroup, Ghana, using airborne magnetic and radiometric data: implications for gold exploration. J Afr Earth Sci2023; 205: 105003.
42.
AffumAOKwaansa-AnsahEEOsaeSD. Estimating groundwater geogenic arsenic contamination and the affected population of river basins underlain mostly with crystalline rocks in Ghana. Environ Challenges2024; 15: 100898.
43.
OberthürTVetterUDavisDW, et al.Age constraints on gold mineralization and Paleoproterozoic crustal evolution in the Ashanti belt of southern Ghana. Precambrian Res1998; 89: 129–143.
44.
AlliboneATeasdaleJCameronG, et al.Timing and structural controls on gold mineralisation at the Bogoso gold mine, Ghana, West Africa. Econ Geol2002b; 97: 949–969.
45.
PigoisJPGrovesDIFletcherIR, et al.Age constraints on Tarkwaian palaeoplacer and lode-gold formation in the Tarkwa–Damang district, SW Ghana. Miner Deposita2003; 38: 695–714.
46.
JessellMWAmponsahPOBaratouxL, et al.Crustal scale transcurrent shearing in the Paleoproterozoic Sefwi–Sunyani–Comoé region, West Africa. Precambrian Res2012; 212: 155–168.
47.
AgbenyeziTKFoliGBrakoBA, et al.Paleoweathering, provenance and tectonic setting of metasedimentary rocks at Ayanfuri area in the Paleoproterozoic Kumasi basin in Ghana: evidence from petrography and geochemistry. J Sediment Environ2022; 7: 519–538.
48.
AgbenyeziTKAdomako-AnsahKFoliG, et al.A review of intrusion-hosted gold systems of the Palaeoproterozoic Birimian terrane of Ghana. Int J Earth Sci2024; 113: 1551–1570.
49.
AlliboneAHMcCuaigTCHarrisD, et al.Structural controls on gold mineralisation at the Ashanti deposit, Obuasi, Ghana. Soc Econ Geol Special Publication2002a; 9: 65–93.
50.
BrakoBAFoliGAdomako-AnsahK, et al.Petrography and geochemistry of some Paleoproterozoic granitoids at the North-Eastern margin of the Kumasi Basin in Ghana. Earth Sciences Malaysia (ESMY)2020; 4: 118–126.
51.
BlockSGanneJBaratouxL, et al.Petrological and geochronological constraints on lower crust exhumation during Paleoproterozoic (Eburnean) orogeny, NW Ghana, West African craton. J Metamorph Geol2015; 33: 463–494.
52.
MasurelQMorleyPThébaudN, et al.Gold deposits of the∼ 15-Moz Ahafo South Camp, Sefwi granite-greenstone belt, Ghana: insights into the anatomy of an orogenic gold plumbing system. Econ Geol2021; 116: 1329–1353.
53.
SiddornJLeeC. Structural geology of the Ashanti II concessions. Southwest Ghana, report compiled by SRK Consulting for PMI Ventures Ltd, 2005, 78.
HirdesWDavisDW. First U–Pb zircon age of extrusive volcanism in the Birimian supergroup of Ghana/West Africa. J Afr Earth Sci1998; 27: 291–294.
56.
SmithAJHenryGFrost-KillianS. A review of the Birimian supergroup-and Tarkwaian Group-hosted gold deposits of Ghana. Episodes J International Geosci2016; 39: 177–197.
57.
WhiteAJWatersDJRobbLJ. Exhumation-driven devolatilisation as a fluid source for orogenic gold mineralisation at the Damang deposit, Ghana. Econ Geol2015; 110: 1009–1025.
58.
TourignyGTranosMDMasurelQ, et al.Structural controls on granitoid-hosted gold mineralisation and paleostress history of the Edikan gold deposits, Kumasi Basin, southwestern Ghana. Miner Deposita2019; 54: 1033–1052.
59.
AgbenyeziTKFoliGGawuSK. Geochemical characteristics of gold-bearing granitoids at Ayanfuri in the Kumasi Basin, Southwestern Ghana: implications for the orogenic-related gold systems. Earth Sci Malaysia (ESMY)2020; 4: 127–134.
60.
KazapoeRWOlugbengaOArhinE, et al.Isotope geochemistry as a tool in the exploration of gold occurrences in Ghana: a review. Arab J Geosci2021; 14: 1992.
SchwarzS. Securities and exchange commission. Res Intern Econ Federal Agencies2019: 113–114.
63.
Dzigbodi-AdjimahKAsamoahD. The geology of the gold deposits of Prestea gold belt of Ghana. Ghana Mining J2010; 11: 7–8.
64.
GrantJA. The isocon diagram; a simple solution to Gresens’ equation for metasomatic alteration. Econ Geol1986; 81: 1976–1982.
65.
GresensRL. Composition-volume relationships of metasomatism. Chem Geol1967; 2: 47–65.
66.
GrantJA. Isocon analysis: a brief review of the method and applications. Phys Chem Earth, Parts A/B/C2005; 30: 997–1004.
67.
BoyntonWV. Cosmochemistry of the rare earth elements: meteorite studies. In: Developments in Geochemistry. 2. Elsevier, 1984, pp.63–114.
68.
TaylorSRMcLennanSM. The geochemical evolution of the continental crust. Rev Geophys1995; 33: 241–265.
69.
KumralMAbdelnasserABudakogluM. Geochemistry of hydrothermal alteration associated with Cenozoic intrusion-hosted Cu-Pb-Zn mineralisation at Tavşanlı Area, Kütahya, NW Turkey. Minerals2016; 6: 13.
70.
TrépanierSMathieuLDaigneaultR, et al.Precursors predicted by artificial neural networks for mass balance calculations: quantifying hydrothermal alteration in volcanic rocks. Comput Geosci2016; 89: 32–43.
71.
MrozekSAChangZSpandlerC, et al.Classifying skarns and quantifying metasomatism at the Antamina deposit, Peru: insights from whole-rock geochemistry. Econ Geol2020; 115: 177–188.
72.
GoldfarbRJGrovesDI. Orogenic gold: common or evolving fluid and metal sources through time. Lithos2015; 233: 2–6.
73.
Adomako-AnsahKMizutaTIshiyamaD, et al.Nature of ore-forming fluid and formation conditions of BIF-hosted gold mineralisation in the Archean Amalia greenstone belt, South Africa: constraints from fluid inclusion and stable isotope studies. Ore Geol Rev2017; 89: 609–626.
74.
Adomako-AnsahKHammondNQMorishitaY, et al.Evolution of auriferous fluids in the Kraaipan-Amalia Greenstone Belts: evidence from mineralogical and isotopic constraints. Minerals2024; 14: 1171.
75.
BergeJ. Paleoproterozoic, turbidite-hosted, gold deposits of the Ashanti gold belt (Ghana, West Africa): comparative analysis of turbidite-hosted gold deposits and an updated genetic model. Ore Geol Rev2011; 39: 91–100.
76.
HenneACrawD. Syn metamorphic carbon mobility and graphite enrichment in metaturbidites as a precursor to orogenic gold mineralisation, Otago Schist, New Zealand. Miner Deposita2012; 47: 781–797.
77.
HuSEvansKCrawD, et al.Resolving the role of carbonaceous material in gold precipitation in metasediment-hosted orogenic gold deposits. Geology2017; 45: 167–170.
78.
DingZSunXHuS, et al.Role of carbonaceous material in gold precipitation for orogenic gold deposits: a case study of the Bangbu gold deposit in southern Tibet, China. Ore Geol Rev2023; 152: 105231.
79.
ZhouYWenZLiuY, et al.The contribution of carbonaceous material to gold mineralisation in the Huangjindong deposit, central Jiangnan Orogen, China. Minerals2024; 14: 1042.
80.
WangLTangLZhangST, et al.Genesis of an Ag-Pb-Zn-F system: insights from in situ sulfur isotope and trace elements of pyrite, and rare earth elements of fluorite in the Baiyine'lebu deposit, Inner Mongolia, China. Ore Geol Rev2022; 141: 104667.
81.
YuQWangZSunQ, et al.In situ trace element and Sulfur isotope composition of pyrite from the Beiwagou Pb-Zn deposit, Liaodong Peninsula, Northeast China: implications for ore genesis. Minerals2023; 13: 1176.
82.
DeditiusAPUtsunomiyaSReichM, et al.Trace metal nanoparticles in pyrite. Ore Geol Rev2011; 42: 32–46.
83.
CaoGZhangYZhaoH, et al.Trace element variations of pyrite in orogenic gold deposits: constraints from big data and machine learning. Ore Geol Rev2023; 157: 105447.
84.
ZhangJDingZBoJ, et al.In situ trace element and S-Pb isotope study of pyrite from the denggezhuang gold deposit in the Jiaodong Peninsula—Insights into the occurrence of gold and the source of ore-forming materials. Minerals2024; 14: 158.
85.
YangZHuangYXuZ, et al.Textures and trace element geochemistry of pyrite in Gaoloushan ore section of the Yangshan gold belt, West Qinling: implications for ore genesis. Ore Geol Rev2024; 165: 105908.
86.
PhillipsGNPowellR. Hydrothermal alteration in the Witwatersrand goldfields. Ore Geol Rev2015; 65: 245–273.
87.
MaoXChenYLiuZ, et al.Hydrothermal alteration and its geochemistry of the Xiadian gold deposit, Jiaodong Peninsula, China: implications for fluid-rock interaction processes and mineral exploration. Ore Geol Rev2024; 26: 106134.
88.
HalderG. Introduction to Chemical Engineering Thermodynamics. DelhiPHI Learning Private Limited, 2014, 665.
89.
PierreSGysiAPMoneckeT. Fluid chemistry of mid-ocean ridge hydrothermal vents: a comparison between numerical modelling and vent geochemical data. Geofluids2018; 1: 20.
90.
LiJWuZTianG, et al.Processes controlling the hydrochemical composition of geothermal fluids in the sandstone and dolostone reservoirs beneath the sedimentary basin in north China. Appl Geochem2022; 138: 105211.
91.
ZoheirBA. Characteristics and genesis of shear zone-related gold mineralisation in Egypt: a case study from the Um El Tuyor mine, South Eastern Desert. Ore Geol Rev2008; 34: 445–470.
92.
ReedMRuskBPalandriJ. The Butte magmatic-hydrothermal system: one fluid yields all alteration and veins. Econ Geol2013; 108: 1379–1396.
93.
KazimotoEO. Short wavelength infrared spectral characterisation of the mineralogy of Gokona and Nyabigena andesite-hosted gold deposits in North Mara, Tanzania. Tanzania J Sci2020; 46: 354–370.
94.
MikuckiEJ. Hydrothermal transport and depositional processes in Archean lode-gold systems: a review. Ore Geol Rev1998; 13: 307–321.
95.
PhillipsGNPowellR. Formation of gold deposits: a metamorphic devolatilisation model. J Metamorph Geol2010; 28: 689–718.
96.
MuminAHFleetME. Evolution of gold mineralisation in the Ashanti gold belt, Ghana: evidence from carbonate compositions and parageneses. Mineral Petrol1995; 55: 265–280.
97.
ErnowoEIdrusAMeyerFM. Elemental gains and losses during hydrothermal alteration in Awak Mas gold deposit, Sulawesi Island, Indonesia: constraints from balanced mineral reactions. Minerals2022; 12: 1630.
98.
GoldfarbRJAndré-MayerASJowittSM, et al.West Africa: the world’s premier Paleoproterozoic gold province. Econ Geol2017; 112: 123–143.
99.
HammondNQRobbLFoyaS, et al.Mineralogical, fluid inclusion and stable isotope characteristics of Birimian orogenic gold mineralisation at the Morila Mine, Mali, West Africa. Ore Geol Rev2011; 39: 218–229.
100.
LawrenceDMTreloarPJRankinAH, et al. A fluid inclusion and stable isotope study at the Loulo mining district, Mali, West Africa: implications for multifluid sources in the generation of orogenic gold deposits. Econ Geol2013; 108: 229–257.
101.
MasurelQThébaudNAlliboneA, et al.Intrusion-related affinity and orogenic gold overprint at the Paleoproterozoic Bonikro Au–(Mo) deposit (Côte d’Ivoire, West African Craton). Miner Deposita2022; 4: 557–580.
102.
TreloarPJLawrenceDMSenghorD, et al. The Massawa gold deposit, Eastern Senegal, West Africa: an orogenic gold deposit sourced from magmatically derived fluids. In: Ore Deposits in an Evolving Earth. Geological Society. London, Special Publications, 2015, 393, pp.135–160.
103.
GaoZLKwakTA. The geochemistry of wall rock alteration in turbidite-hosted gold vein deposits, central Victoria, Australia. J Geochem Explor1997; 59: 259274.
104.
LiXKwakTABrownRW. Wallrock alteration in the Bendigo gold ore field, Victoria, Australia: uses in exploration. Ore Geol Rev1998; 13: 381–406.
105.
ChristieABBrathwaiteRL. Hydrothermal alteration in metasedimentary rock-hosted orogenic gold deposits, Reefton goldfield, South Island, New Zealand. Mineralium Ddeposita2002; 38: 87–107.
106.
KontakDJSmithPK. A metaturbidite-hosted lode gold deposit; the Beaver Dam Deposit, Nova Scotia; I, Vein paragenesis and mineral chemistry. Can Mineral1993; 31: 471–522.
