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Ley 26.639 of 2010 — the Régimen de Presupuestos Mínimos para la Preservación de los Glaciares y del Ambiente Periglacial — established a uniform federal floor that prohibited mining and other "intensive" industrial activity on glaciers and on the broader periglacial environment (the cold zone surrounding glaciers where frozen-ground processes occur). The federal definition was deliberately broad: any geoform potentially performing a hydrological role was in scope, and the Inventario Nacional de Glaciares maintained by IANIGLA (Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales) served as the single technical reference.
Ley 27.804 narrows that perimeter on two axes:
glaciers and periglacial geoforms that perform a proven hydrological function — i.e. that materially contribute to basin recharge or drinking-water supply. Geoforms outside that test fall out of the federal floor.
define the technical and scientific criteria used to delimit protected areas inside their territory. The reform invokes Article 124 of the Constitución Nacional (provincial sovereignty over natural resources) as its hook. IANIGLA retains the inventory mandate but no longer operates as the binding federal arbiter.
The institutional consequence is that any mining province with an incentive to certify a periglacial zone as low-hydrological-function can now do so, subject to its own administrative law. The provinces most directly affected — San Juan, Mendoza, Catamarca, La Rioja, Salta, Jujuy, Santa Cruz — collectively host the "ABCD" copper pipeline plus the bulk of Argentina's lithium-triangle assets.
Severity 4 (mixed). Quant inputs:
(Cámara Argentina de Empresarios Mineros / CAEM), ~70% in copper / gold / silver, ~30% in lithium and other materials.
Newmont; Filo del Sol — Lundin / BHP JV; Josemaría — Lundin / BHP JV; Los Azules — McEwen Copper; El Pachón — Glencore) collectively targets ~1.0–1.3 Mt/yr of new copper-cathode-equivalent capacity by 2030, ~5% of current global mined copper supply.
USD 18–22bn (2030) on the copper-pipeline ramp; the periglacial- buffer constraint had been the single largest legal blocker.
Qual inputs:
mínimo since the constitutional environment-rights framework was installed in 1994. Sets jurisprudential precedent for provincial control of other federal environmental floors (forests, wetlands, biodiversity).
— RIGI provides 30-year fiscal stability, Decreto 563 zero-rates the mining DEX, and Ley 27.804 removes the binding territorial constraint. Together they form a coherent three-instrument Argentine investment-attraction stack for the 2026–2030 mining ramp.
days of promulgation; provincial governments (Mendoza majority of Congressional bloc voted against despite governor's silence) split. Constitutional challenge is plausible but unlikely to halt implementation given Court composition.
Vicuña JV, USD ~3.9bn FID expected 2026–2027), Los Azules (McEwen, USD ~2.7bn DFS), Agua Rica/MARA (Glencore, USD ~3.7bn) — all four exit the periglacial-buffer legal grey zone. First-cathode dates cluster 2028–2030.
high-altitude lithium projects (Olaroz, Cauchari, Pastos Grandes, Sal de Vida, Pozuelos-Pastos Grandes basin) and federal periglacial protection. Marginal beneficiary, since most active lithium brine plays sit below the periglacial threshold; matters more for expansion plays in San Juan / Catamarca.
shifts the 2028–2032 supply curve materially; consensus independent-house deficit forecasts (Wood Mackenzie, CRU) had largely treated the ABCD pipeline as "stranded" on legal and fiscal risk. RIGI (2024) + Decreto 563 (2025) + Ley 27.804 (2026) collectively change that risk-weight.
Indonesia / DRC / Zimbabwe export-ban / domestic-beneficiation template — Argentina is using deregulation + fiscal incentives rather than coercive value-add capture. Worth reading alongside Chile's Lithium Strategy and Mexico's Plan Mexico nearshoring as the third Latin American playbook variant.
2026-02-05-us-argentina-reciprocal-trade-investment-agreement thesis: US offtake / DFC financing for Argentine copper and lithium becomes more bankable once territorial uncertainty collapses.
Buenos Aires) obtains a precautionary injunction suspending application in any province pending constitutional review. Short- term odds low; medium-term odds higher if Mendoza or another high-water-stress province elects to keep stricter protection and a federal-supremacy challenge emerges from the other side.
own technical-criteria regulation. San Juan and Catamarca expected to move within 6–9 months; Mendoza politically fraught given Glaciar Tupungato / Polvaredas water-supply salience.
after losing binding force — depends on provincial willingness to invest in independent technical capacity.
approved before the reform inherit the prior periglacial regime for 30 years, which could create odd asymmetries between RIGI and non-RIGI projects on adjacent claims.