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A gigantic map of all the cool plaques in the world.

A gigantic map of all the cool plaques in the world. A project of 99% Invisible

Site of First Minig Operation in California; Site of Reduction Works

Site of First Minig Operation in California; Site of Reduction Works

👤 Submitted by anonymous 📅 2025-06-30

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Site of First Minig Operation in California; Site of Reduction Works

Read The Plaque is licensed under a Creative Commons Attribution 4.0 International License unless otherwise noted. Site by Kester Allen. Contact us by Facebook or info@readtheplaque.com. Thanks to MapLibre and OpenStreetMap for great mapping tools.