![Signs of Saltpeter Mining in Mammoth Cave in Mammoth Cave National Park-Kentucky Photograph by Ruth Hager Signs of Saltpeter Mining in Mammoth Cave in Mammoth Cave National Park-Kentucky Photograph by Ruth Hager](https://render.fineartamerica.com/images/rendered/small/flat/weekender-tote-bag/images/artworkimages/medium/1/signs-of-saltpeter-mining-in-mammoth-cave-in-mammoth-cave-national-park-kentucky-ruth-hager.jpg?transparent=0&targetx=0&targety=-39&imagewidth=779&imageheight=584&modelwidth=779&modelheight=506&backgroundcolor=AB722C&orientation=0&producttype=totebagweekender-24-16-white&imageid=2385241)
Signs of Saltpeter Mining in Mammoth Cave in Mammoth Cave National Park-Kentucky Photograph by Ruth Hager
![Shasta Lake City, East Shasta Copper - Zinc Mining District, Klamath Mountains, Shasta Co., California, USA View of the Shasta Lake Au-Ag-Pb-Cu-Zn mining area, in 1903. Shasta Lake City, East Shasta Copper - Zinc Mining District, Klamath Mountains ... Shasta Lake City, East Shasta Copper - Zinc Mining District, Klamath Mountains, Shasta Co., California, USA View of the Shasta Lake Au-Ag-Pb-Cu-Zn mining area, in 1903. Shasta Lake City, East Shasta Copper - Zinc Mining District, Klamath Mountains ...](https://www.mindat.org/imagecache/c1/cd/01761370016103922895405.jpg)
Shasta Lake City, East Shasta Copper - Zinc Mining District, Klamath Mountains, Shasta Co., California, USA View of the Shasta Lake Au-Ag-Pb-Cu-Zn mining area, in 1903. Shasta Lake City, East Shasta Copper - Zinc Mining District, Klamath Mountains ...
![Signs of Saltpeter Mining in Mammoth Cave in Mammoth Cave National Park-Kentucky Photograph by Ruth Hager Signs of Saltpeter Mining in Mammoth Cave in Mammoth Cave National Park-Kentucky Photograph by Ruth Hager](https://render.fineartamerica.com/images/rendered/small/tote-bag/images/artworkimages/medium/1/signs-of-saltpeter-mining-in-mammoth-cave-in-mammoth-cave-national-park-kentucky-ruth-hager.jpg?transparent=0&targetx=-125&targety=0&imagewidth=1016&imageheight=763&modelwidth=763&modelheight=763&backgroundcolor=725329&orientation=0&producttype=totebag-18-18&imageid=2385241)
Signs of Saltpeter Mining in Mammoth Cave in Mammoth Cave National Park-Kentucky Photograph by Ruth Hager
![Russian miners are risking their lives to make their fortune by illegally unearthing 'ethical ivory' | Daily Mail Online Russian miners are risking their lives to make their fortune by illegally unearthing 'ethical ivory' | Daily Mail Online](https://i.dailymail.co.uk/1s/2020/02/11/11/24599802-0-image-a-59_1581422222109.jpg)