The Economic
Geochemist

Research translated for mineral exploration

The science worth knowing.
Without the academic fog.

Critical analysis of new mineral-deposit and geochemical research—distilled into evidence, limitations and practical exploration decisions.

Reviewed byJ. Sebastian Nava de la PeñaEconomic geologist · University of St Andrews
Latest field intelligenceIssue 01 — 2026
CuPaper decodedHigh-sulphidation to porphyry
Evidence → interpretation → decision ↗
Paper decoded

Reading patchy and nodular alteration as a porphyry vector

Halloran et al. interpret nodular pyrophyllite-rich alteration as a replacement texture that can mark a palaeothermal envelope near the base of a lithocap.

Exploration and mining implications

Test patchy textures through mineral identification, replacement relationships and the regional alteration pattern before using them to vector towards a concealed porphyry.

5 min read · October 2026Read analysis ↗
AuPaper decodedHigh-sulfidation epithermal gold
Evidence → interpretation → decision ↗
Paper decoded

How SWIR mineralogy and detailed volcano-stratigraphic log guides exploration drilling

Maryono et al. show that SWIR is most useful when it is tied to named mineralized centres, rock textures, structural position and grade—not interpreted as a standalone alteration map.

Exploration and mining implications

Use volcanostratigraphy and breccia interpretation to identify the body, then use SWIR to position it within the hydrothermal system and target permeable or structurally focused zones.

9 min read · October 2026Read analysis ↗
LiPaper decodedLithium pegmatites
Evidence → interpretation → decision ↗
Paper decoded

Giant lithium pegmatites may begin with refertilised greenstone roots

Smithies et al. propose that sanukitoid-refertilised Archaean crust beneath greenstone belts may generate fertile leucogranites associated with giant lithium pegmatites.

Exploration and mining implications

Map the complete fertility chain: greenstone-belt architecture, hydrous sanukitoid magmatism, biotite-rich alteration and Li-Cs-enriched leucogranite.

9 min read · September 2026Read analysis ↗
WPaper decodedTungsten and tin
Evidence → interpretation → decision ↗
Paper decoded

Tungsten and tin fertility begins with different crustal sources

Xia et al. link regional W-Sn zonation to contrasting metasedimentary sources and melting conditions, then show how emplacement and differentiation modify that inherited fertility.

Exploration and mining implications

Map the full source-to-ore system: basement composition and melting establish fertility, while emplacement, fluids, structures and reactive hosts determine the ore style.

9 min read · September 2026Read analysis ↗
MoPaper decodedPorphyry molybdenum
Evidence → interpretation → decision ↗
Paper decoded

Fluorine-rich lower crust may prime molybdenum systems

Rosera et al. trace fluorine from amphibole-bearing lower crust to evolved silicic magmas, showing how source fertility may favour rare Climax-type porphyry Mo systems.

Exploration and mining implications

Treat fluorine as a fertility indicator, not proof of ore: magma volume, Mo and S budgets, fluid extraction, focusing and preservation must also converge.

9 min read · September 2026Read analysis ↗
LiPaper decodedClaystone lithium
Evidence → interpretation → decision ↗
Paper decoded

How hydrothermal alteration upgrades lithium claystones

Benson et al. show that McDermitt’s highest lithium grades formed when resurgence-related fluids transformed earlier Li-bearing smectite into Li-rich illite at Thacker Pass.

Exploration and mining implications

Target the overlap of fertile peralkaline volcanism, a preserved closed lake, Li-smectite, resurgence structures and a high-temperature illitization footprint.

8 min read · August 2026Read analysis ↗
CuPaper decodedPorphyry copper
Evidence → interpretation → decision ↗
Paper decoded

Copper mineralization formed early and hot

Late low-temperature quartz can sit against copper sulfides without having deposited them—a distinction that changes how porphyry vein histories are reconstructed.

Exploration and mining implications

Reconstruct vein sequence before assigning meaning to a sulfide–quartz contact; late quartz may record reopening, not a new Cu event.

8 min read · August 2026Read analysis ↗
LiPaper decodedLithium pegmatites
Evidence → interpretation → decision ↗
Paper decoded

Rare-metal pegmatites begin with the source

Tang et al. connect weathering, sediment recycling and Late Triassic extension into a crust-to-deposit model for East Asian LCT pegmatites.

Exploration and mining implications

Search for the complete crustal process—not only an evolved granite: fertile sediments, recycling, anatexis and structural focusing must coincide.

8 min read · August 2026Read analysis ↗

A useful email, not more noise

The month’s most relevant research—in one field briefing.