Big Bend Scientist Spills the Beans on What's Inside the Old Mercury Mine

There's an old mercury mine in Big Bend that's still breathing. At Mariscal Mine, down near the Mexican border, a sensor on one sealed shaft picked up mercury vapor rising and falling on a slow, steady count, with no wind at all. Long, narrow handprints turned up in the waste piles. And one morning, the steel grate over that shaft was bent outward, from underneath.

Rosa, a Park Service geologist whose great-grandfather fired the furnace at Mariscal a hundred years ago, went out in January to finish a mercury sampling grid on the old waste heaps. One night her headlamp caught pale, long-limbed shapes crawling on all fours through the furnace ruins.

This is an original horror story set in a real place: Mariscal Mine on the north end of Mariscal Mountain in Big Bend National Park, Texas, the River Road, Fresno Creek, Glenn Spring, Presidio and the Rio Grande. The history is real: Martin Solis finding cinnabar in 1900, the First World War demand for mercury, the ore bins and retorts built by a Midwestern inventor, the New York-backed company that built the stone houses from 1919 to 1923, the Scott furnace of site-made clay brick that had to burn for nearly a year before it gave any mercury back, the Mexican workers and families who did the work, the mine's closing in 1943, and Big Bend becoming a national park in 1944. The mercury-vapor numbers come from the USGS study of the Big Bend mines. Rosa, Eli, Mark, the survey, the shafts and everything they found are fiction. No real agency procedure, report or official is depicted, and the instrument displays are story illustrations.

If you've ever driven the River Road out to Mariscal, or stood over an old mine shaft and felt the air move when there wasn't any wind, tell me in the comments. Which mine was it, and which way was the air going?

Subscribe, because there are more than thirty old mercury mines in that corner of Texas, and Mariscal is only the one inside the park.

Satellite imagery: Powered by Esri. Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community. Terrain: Mapterhorn via Re:Earth terrain service (CC BY 4.0). Map data © OpenStreetMap contributors (ODbL). Map engine: Gods Eye View by Bilawal Sidhu (github.com/bilawalsidhu/gods-eye-view).

Terrain: USGS 3DEP via AWS Terrain Tiles (Mapzen/Tilezen). Map data (c) OpenStreetMap contributors, ODbL (the River Road, the Rio Grande, places). Mine location: National Register of Historic Places. Mercury vapor figures: USGS Circular 1327, chapter 5 (Gray, Theodorakos and Krabbenhoft). The January terrain shadow is computed from the elevation data; the sampling grid, shafts, tunnels and ruins layout are story graphics (simulated/schematic).

Archive photographs (public domain): Historic American Engineering Record, HAER TX-72, Mariscal Quicksilver Mine and Reduction Works (Library of Congress), via Wikimedia Commons.

STORY DISCLAIMER: This video is an original work of fiction created for entertainment. The characters, dialogue, supernatural encounters, and story-specific events are invented and are not presented as verified accounts.

Real locations, historical background, and references to organizations are used as settings and context. Invented characters are not intended to depict actual employees or representatives of those organizations. Any resemblance to actual persons or their experiences is coincidental.

Any simulated testimony, reports, recordings, or documents appearing within the story are storytelling elements, not authentic evidence of the depicted encounter. AI-generated imagery and other dramatized visuals are illustrative and are not footage documenting that encounter.

No affiliation with or endorsement by any park, government agency, scientific institution, or other organization mentioned is claimed.

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