What if another Vale tailings dam bursts?
A Brumadinho-scale Vale tailings failure plus a regulator-ordered upstream-dam shutdown removes large iron-ore tonnage — the direct move is iron ore higher on the supply shock and Vale equity sharply lower on liability/closure, with the copper leg incidental. Rhymes precisely with the Jan-2019 Brumadinho disaster that cut ~90Mt of Vale output and spiked iron ore ~30% while Vale stock fell ~25%. Forward angle: a second event would harden Brazilian regulation and ESG financing constraints, structurally raising Vale's cost of capital — the asymmetric trade is short Vale equity even as the ore price spikes.
how we built this number — every step
The class rate is measured from our dated, sourced event library (decade-normalized Poisson — the full table is public at base_rates.json). The variant’s share within its class is the analyst’s editorial call, published so you can audit it. A wider range means thinner precedent. Full recipe: methodology · scored at Reality Check.
The butterfly cascade
How this trigger trickles across markets, left → right — the root shock, its first‑order moves, then the ripple effects. Drag any node; tap a market for its real price history.
Resolution timeline — how this probability is moving
Our model's odds (gold) over time vs the crowd's (Polymarket, blue), from the past toward the 0–6 months horizon. Each dot is a real macro event that nudged the probability — green pushed it up, red pushed it down. Tap a dot for the source. The gold path is an illustrative reconstruction anchored to today's estimate — real dated events, not a live re-estimate history.
What it would mean
If this plays out, it is a mixed shock. Another Brumadinho-scale tailings failure halts Vale operations and triggers a regulator-ordered shutdown of upstream dams. The trigger decomposes into signed root‑shocks — Growth surprise ▼ · Industrial demand ▲ — which propagate through our causal graph to the markets below.
If it happens — the markets it would move
Biggest moves first. Projected moves are cascade-model priors; hist A–B% = what comparable past events actually did (measured abnormal returns), and model prior · unmeasured marks markets with no analogue backing yet. Tap any market for its price history.
| Market | Class | Projected move | |
|---|---|---|---|
| 1 | Freeport (copper) FCX 📈 chart | Equity | ▲ +0.7% hist -0.91–+0.6% · other way +1.24% (n=11) |
| 2 | Copper XCUon Hyperliquid 📈 chart | Commodity | ▲ +0.3% hist -1.75–+0.56% · other way +2.25% (n=11) |
| 3 | Platinum XPTon Hyperliquid 📈 chart | Commodity | ▲ +0.2% hist -1.03–+0.29% · other way +5.62% (n=11) |
| 4 | Palladium XPDon Hyperliquid 📈 chart | Commodity | ▲ +0.2% hist -0.12–+0.53% · other way +3.88% (n=11) |
Probable recommendation
Why we may diverge from history
Trust the cascade long on FCX/XPT: history's negatives come from COVID-2020 and 2011 gold-peak deleveraging windows — broad risk-off crashes, not a Vale supply cut tightening copper/PGM metal.
Historical precedent — what analogous events actually did
Across 40 analogous events (overlap‑weighted), as abnormal returns — market beta stripped, so it's the event's own effect, not the market backdrop. Shown at 20 days (persistent) and 5 days (immediate); ↺ fades = the two horizons disagree. Confidence = consistency × sample × significance.
| Asset | History says | Abnormal (20d · 5d) | Hit | n | Confidence | vs cascade |
|---|---|---|---|---|---|---|
| Gold XAU | LONG | +1.5% · 5d +0.3% | 70% | 33 | 0.36 | · |
| XPT XPT | SHORT | -0.9% · 5d +0.3% ↺ fades | 68% | 33 | 0.32 | ⚠ differs |
| XCU XCU | SHORT | -1.6% · 5d -0.8% | 66% | 33 | 0.28 | ⚠ differs |
| FCX FCX | SHORT | -1.1% · 5d +0.3% ↺ fades | 61% | 33 | 0.19 | ⚠ differs |
| US dollar DXY | SHORT | -0.3% · 5d +0.1% ↺ fades | 60% | 40 | 0.19 | · |
| 10y yield DGS10 | SHORT | -3bp · 5d +1bp ↺ fades | 57% | 40 | 0.13 | · |
| Volatility VIX | LONG | +3.2% · 5d +0.3% | 57% | 34 | 0.11 | · |
| XPD XPD | LONG | +0.4% · 5d -0.2% ↺ fades | 55% | 33 | 0.08 | ✓ matches cascade |
| Bitcoin BTC | LONG | +0.5% · 5d -2.5% ↺ fades | 46% | 28 | 0.00 | · |
| High-yield credit HYG | LONG | +0.7% · 5d -0.2% ↺ fades | 43% | 33 | 0.00 | · |
Why this probability
A fresh Brumadinho-scale Vale dam burst is a rare catastrophic tail event. A base‑rate‑anchored prior, continuously scored against what actually happens — not a forecast.