Mines

Cutaway illustration of a cable tram strung across the Colorado River at Hakatai Canyon, carrying sacks of asbestos ore toward a small mine opening in a side canyon wall

Bass Asbestos Mine: William Bass's trail-and-tram asbestos claim

A trail-builder’s side-hustle asbestos claim in Hakatai Canyon, sold for wartime prices in 1917-1918, now a 500-foot no-entry buffer in the park’s rulebook.

Labeled cutaway cross-section of a canyon cliff showing a breccia pipe: an ancient collapsed cave on one side filling with ore, a modern mine shaft cut into it on the other, with the host examining both halves.

Grand Canyon Underground: How Caves, Mines and Bats Connect

Karst geology links the park’s caves and its uranium mines directly: many ore-bearing breccia pipes are collapsed ancient caves, excavated twice over.

Illustrated map-style cutaway of the Grand Canyon showing scattered small icons for mine adits, shafts, and tailings piles across the rim and inner canyon

Grand Canyon's mine inventory: 38 sites, 75 features, by the numbers

NPS has counted 75 abandoned mine features across 38 sites in the park, part of a 37,050-feature nationwide problem. Here’s the public accounting.

Cutaway illustration of a rugged switchback trail descending toward a small asbestos mine adit near a roaring rapid on the Colorado River

Hance Mine: the asbestos claim behind the canyon's first tour guide

John Hance mined asbestos near Sockdolager Rapids, sold out in 1901, and became famous for storytelling instead. The river corridor there is now a hard closure.

Cutaway illustration comparing a natural cave passage and a human-dug mine adit side by side in a canyon cliff, with a bearded host inspecting both.

Mines vs. Natural Caves: How Grand Canyon Tells Them Apart

Federal and park rules define caves and mines differently, deciding who needs a permit, why a site is closed, and how NPS counts what is underground.