Trail 2026-10-19 (eighth session)

Budget: 15 fetched pages or 40 tool calls. Orientation: steer, index, research-values, dead-ends, trail-2026-10-12, trail-2026-10-14, trail-2026-10-16, weekly note 2026-10-18.

Thread chosen: steer item 1, macro-view resources leg (within thread-transition), from the side nobody has opened yet: scrap. Steer asks "what has kept real copper prices flat"; the 12 Oct trail found technology and labour geography, but never the secondary supply. If old copper (scrap) caps the price when primary extraction gets dear, then the convivial question changes shape: the frugal route is not the mine but the junk trade, which historically was small dealers and informal recyclers. It also rhymes with surplus hardware (steer item 2). The Borremans OCR continuation is blocked by tooling unless OCR has appeared; checked below.

Hops

Tooling: web_extract still broken (extract_backend is empty); searches come through the free-tier fallback; still no OCR or PDF tools, so the Borremans continuation stays blocked. ADS shows a bot check, MIT DSpace returned 429, ISPreview 403. Each hop says full read or search text. Searches count as fetches.

1. Expect: the share of scrap in refined copper and whether scrap supply responds to price, which would make it the hidden ceiling. -> search text: Fu et al. (MIT 2017) say refined scrap supply is "price inelastic", driven by GDP; a China import-ban model. Pointed to Tilton's own paper.
2. Expect: Zimring's history of the scrap trade, the old and forgotten end of secondary supply. -> catalogue entries, plus a pointer to Woloson's article.
3. Expect: the MIT paper in full. -> HTTP 429. Nothing.
4. Expect: Gómez, Guzmán & Tilton 2007, the primary test. -> abstract read in full: the old-scrap stock tripled, secondary output only doubled; the stock barely responds, only the yearly flow (~4%) does. Scrap is not the brake. "I looked for a scrap ceiling and it was not there" is the result.
5. Expect: who actually did secondary extraction historically. -> Woloson 2019, long open-access passages: immigrant pickers and boy junkers stripping copper sheathing and pipe in the 1840s-1900s; commodification "laundered" the scrap and erased them. Stated.
6. Expect: copper left in place in cities (an ore body a town might own). -> titles: "hibernating copper stocks", Norrköping, GIS prospecting. Unrecognised term; worth following.
7. Expect: waste-picker cooperatives as the present-day convivial form of secondary supply. -> catalogue and a WIEGO profile title only. Not followed (budget).
8. Expect: the hibernating-copper abstracts. -> ADS bot wall; RePEc abstract read in full (GIS plus MFA tied to "social practices").
9. Expect: the scale under one town. -> LiU press releases and Wallsten et al. 2013 (search text, long): ~5,000 t of metal under Norrköping, a quarter of the installed systems; at least 560 t of copper on municipal land; 4-5 kg disconnected copper per Swede; prospected from the City Archive; "urk" = disconnected; hibernating cable is not legally waste. Surprise.
10. Expect: Krook 2011's economics. -> abstract via Metabolism of Cities and KTH excerpt: 0.04-0.05 t copper per grid subscriber; up to 20% out of use in Gothenburg; separate recovery uneconomic at 2011 prices, viable alongside other digging.
11. Expect: Kabel-X and whether de-coring copper to pull fibre through the same sheath is real. -> forum snippets only; ISPreview headline: fibre "costs less than the scrap value of the same length of copper".
12. Expect: ISPreview in full. -> 403.
13. Expect: BT's recovered tonnage. -> Guardian 2024 and 2026 and a summary (search text, long): 22,347 t since 2023, up to 200,000 t expected, £105m + £99m forward sales to EMR, record copper "driven partly by data centre construction". Surprise.

Stopped at budget: 15 fetches/searches (counting the three blocked pages).

Hunches (unsourced, not in wiki)

• The resources race has a mirror race: as primary extraction gets dearer, re-extraction from a town's own buried infrastructure gets cheaper by comparison. That stock is local, mapped in municipal archives, and often on public land: the one kind of copper ore a community could plausibly own.
• Who owns the decommissioned plant decides who gets the windfall. The US farmer mutuals and Saskatchewan's rural companies were absorbed before their copper was worth anything; BT keeps the copper of a network the public once paid for. If James's surplus-hardware route works, the same question applies to decommissioned servers: who holds title at retirement.
• AI capex reaches the convivial question twice: it raises the price of the copper a community might hold, and it makes the surplus hardware James wants to run on. Connects to the open steer hunch on AI capex. Unchecked.

End of session

Surprises

• Swedish cities are sitting on their own copper mines: disconnected cables and pipes left in the ground, ~5,000 t of metal under Norrköping alone (a quarter of all installed infrastructure there), at least 560 t of it copper on municipal land, found by reading the city archive. Hibernating cable is not legally waste, so nobody has to recover it. https://liu.se/en/article/welcome-to-the-world-of-the-urks ; https://doi.org/10.1080/10630732.2013.809222
• At 2026 prices one such mine is being worked at national scale: BT has pulled 22,347 t from the UK's old telephone network since 2023, expects up to 200,000 t, and has sold it forward for £204m so far, with copper at a record partly because of data-centre building. https://www.theguardian.com/business/2026/aug/31/bt-windfall-selling-old-copper-cables-telecoms-broadband-metal
• What I went looking for was not there: scrap is not a hidden price ceiling. The old-scrap stock tripled in 40 years but recycling from it only doubled; only the yearly end-of-life flow responds. https://doi.org/10.1016/j.resourpol.2007.08.002

Dead end: none new beyond blocked pages (ADS bot check, MIT 429, ISPreview 403); noted in dead-ends. Worth continuing: wallsten-urban-infrastructure-mines. Next hop: Wallsten's thesis The Urk World (http://liu.diva-portal.org/smash/get/diva2:872787/FULLTEXT02.pdf), for who has legal title to hibernating cable and whether any municipality has recovered and kept it. Permission to chase: waste-picker cooperatives (Brazil's catadores, recognised as service providers since the late 1980s) as the present-day convivial form of secondary extraction, set against Woloson's erased child junkers. Budget used: 15 fetches/searches (of 15); ~34 tool calls (of 40).