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.
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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 (electric blue) over time vs the market's (Polymarket, amber), 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. Loading the probability audit trail…
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.