Epithermal Gold-Silver Mineralization Mechanisms
Summary
Epithermal gold-silver deposits form in the uppermost crust, typically at depths of less than 1.5 km and temperatures between 50 °C and 300 °C. They are subdivided into low-sulfidation and high-sulfidation types according to the chemistry of mineralising fluids and alteration assemblages. Low-sulfidation systems characteristically feature neutral pH, moderate salinity, and quartz–adularia veins carrying native gold, electrum and acanthite. Mineral precipitation is driven by fluid boiling, mixing with groundwater or wall-rock buffering. High-sulfidation systems develop from acidic, oxidised fluids rising from porphyry centres, producing advanced argillic alteration (e.g. alunite, dickite), vuggy silica and gold-telluride assemblages. Structural controls such as faults and extensional fractures focus fluid flow, while pulsed magmatism or tectonic events dictate fluid evolution and metal deposition. Key processes include phase separation, redox reactions, pH changes and sulphur fugacity variations. Epithermal deposits occur in diverse tectonic settings worldwide, from island arcs to continental rifts, and represent a major source of gold and silver, with implications for exploration strategies that integrate geochemistry, geophysics and structural geology.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Epithermal Gold-Silver Mineralization Mechanisms publication trend
The graph below shows the total number of articles in epithermal gold-silver mineralization mechanisms across all publications each year (not limited to Nature Index journals).
Technical terms
Epithermal deposit: A shallow, hydrothermal ore deposit formed at low to moderate temperatures, hosting precious metals in veins and stockworks.
Low-sulfidation: A deposit type wherein near-neutral pH, low-sulfide fluids precipitate gold and silver predominantly as native metals and simple sulphides.
High-sulfidation: A deposit type formed from acidic, oxidised fluids, producing advanced argillic alteration and complex sulphide–sulphosalt mineralogy.
Fluid inclusion: A microscopic trapped pocket of mineralising fluid within a crystal, used to determine the temperature, pressure and composition of ore-forming solutions.
Adularia: A low-temperature potassium feldspar commonly associated with low-sulfidation epithermal veins and indicative of boiling zones.
References
- Epithermal Au–Ag–Se–Te Deposits of the Chukchi Peninsula (Arctic Zone of Russia): Metallogeny, Mineral Assemblages, and Fluid Regime. Russian Geology and Geophysics (2022).
- The Role of Selenium and Hydrocarbons in Au-Ag Ore Formation in the Rodnikovoe Low-Sulfidation (LS) Epithermal Deposit, Kamchatka Peninsula, Russia. Minerals (2022).
- Au-Ag-Se-Te-S Mineralization in the Maletoyvayam High-Sulfidation Epithermal Deposit, Kamchatka Peninsula. Minerals (2023).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.