El Oro de Hidalgo district

Where: Mexico State · North America · approx. 19.8, -100.13 (vicinity only)

Why this spot: Gold-quartz veins twinned with Tlalpujahua that made El Oro a belle epoque boomtown

What turns up: vein quartz, pyrite

Access: Permission required.

Heritage town with mine remnants on municipal and private land, no open collecting areas.

Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.