URUANA DE MINAS — MAGNETIC × GEOLOGY HOLDOUT AUDIT

Magnetic-only selection (before geology):
- fixed center: -16.0593, -46.2585
- frozen target: 0–8 km
- 30 reconstructions: field raw/diurnal-corrected × detrend degrees 1–3 × upward continuation 0/1/2/4/6 km
- mirrored 1-km candidate lattice inside each 8-km window
- selected anchor minimizes Pmax, the worst-case distance to the 30 zero contours

Uruana magnetic anchor:
- offset: +2 km east, +5 km north
- distance from city: 5.385 km
- Pmax: 0.937 km
- independent SGB geology opened afterward
- nearest lithologic contact: Serra de Santa Helena / Lagoa do Jacaré
- contact distance: 30.7 m

Mirrored regional holdout:
- controls <16 km excluded to prevent overlap of two 8-km target windows
- n = 1195 non-overlapping controls
- contact as close as Uruana: 19/1195 = 1.59%
- magnetic Pmax equal or better than Uruana: 61 controls
- among those, contact as close as Uruana: 1/61 = 1.64%
- controls satisfying BOTH thresholds: 1/1195 = 0.084%

Status:
- This is an exploratory mirrored rank, not a confirmatory p-value.
- The cross-domain observation is strong because the magnetic anchor was fixed before opening the lithologic map.
- Uruana is not unique: one non-overlapping control matches/exceeds both observed thresholds.

Directional audit:
- A subset of nearby SGB lineaments/faults has local strike ~40–41°, near the historical ~43° direction.
- However, a length-weighted 8-km directional null shows the 43° share is not rare regionally.
- Therefore 43° is NOT promoted to core evidence.
- The magnetic zero-contour tangent also rotates materially with upward continuation, so a single fixed ~14° magnetic-axis claim is retired.