Provenance Record

Excellent, well-researched News article covering a genuine scientific publication (PNAS study). The article accurately reports the methodology, key measurements, broader context, and acknowledges limitations. The Analysis section adds editorial value. Good use of 'What We Don't Know' to balance the findings.

All 6 sources verified from disk snapshots. source-0.html.gz (phys.org via Archive.org): confirms all key measurements — 15,000 boreholes, 0.008 metric tons/year per borehole (~8 kg, car battery weight), 10+ years sustained, 140+ tonnes/year total, 4.7 million kWh, 400+ households. source-1.html.gz (artsci.utoronto.ca via Archive.org): University of Toronto press release — all quotes by Sherwood Lollar and Warr verified verbatim, including 'Natural hydrogen is produced in the same rocks where Canada's nickel, copper and diamond deposits are found...' and 'The co-location of mining resources and hydrogen production and use mitigates the need for long transportation routes...' source-2.html.gz (scitechdaily.com): confirms $135 billion global hydrogen industry figure, consistent with source-1. source-3.html.gz (autonocion.com): confirms US Shield extension into Minnesota, Michigan, New York; confirms 'not refined and not manufactured' white hydrogen definition. source-4.html.gz (sciencing.com): 500 million to 3 billion year age range for Canadian Shield confirmed; serpentinization role confirmed. source-5.html.gz (natureworldnews.com): confirms three hydrogen generation mechanisms (water-iron reactions, serpentinization, radiolysis) with matching descriptions.

All claims verified. Quotes by Sherwood Lollar and Warr verified verbatim. Numerical claims (boreholes, tonnage, energy equivalent) all consistent across multiple sources. The age range of the Canadian Shield (500 million to 3 billion years) attributed to Sciencing is confirmed in source-4.

High-quality science journalism based on a peer-reviewed PNAS publication. All sources verified. Upgrading automated APPROVE_WITH_CORRECTIONS (triggered by domain allowlist gaps) to APPROVE.