JMIS three-source field analysis · 2026-08-18

Little Johnny Mine

A short LiDAR-driven hike produced a substantial field result: a large open-workings complex with fractured walls, loose block piles and historic wood debris. The route was fused from Gaia, onX and Apple Watch data without inventing movement through the mine-area recording gap.

2.68 micanonical route

514 ftelevation gain

3h 20melapsed

2h 08mWatch active

145 bpmaverage HR

187 bpmmaximum HR

72.4 minmine-area gap

0.28 miphoto evidence span

What the timeline shows

21:11Route begins east of the workings.21:31First arrival in the western mine zone.21:37–22:49A 72.4-minute onX recording gap holds at essentially one coordinate. It is consistent with stationary or signal-obscured exploration and contributes no synthetic mileage.23:09–00:12Seven geotagged photos document multiple stations across roughly 448 m of open workings.00:30Route ends; total elapsed time is 200 minutes.

Finding classification

Novel / unmatched in the current Atlas reference layers.

The nearest current reference to the later open-workings photos is Mammoth Mill, about 374 m away. That is too far for a confident positional match, so the field observation is logged separately rather than forced onto a known mine record.

Photo evidence

Large open-cut or rock-cavity geometry visible from multiple viewpoints.
Steep, closely fractured rock walls and extensive loose blocks.
Historic timber/wood debris within the workings.
Eight geotagged photos retained in the deferred photo manifest; the CORE Atlas remains lightweight.

Visual interpretation is descriptive, not a geotechnical stability assessment.

Data quality

Gaia and onX agree at a median of 2.8 m, which is high confidence for this terrain. The canonical line uses onX geometry, Gaia as a geometry/elevation guardrail, and 1,505 route-linked Apple heart-rate samples. Raw source tracks and the full Apple route are archived beside the fused GPX.