Note:

That collection of mining photos on this page—MASSIVE wood mills in barren desert landscapes that remain unchanged today. It raises some interesting points:

  1. Resource Logistics – These mills needed enormous amounts of water and energy, yet they operated in arid regions. How was water transported or sourced? Did they deplete underground aquifers, contributing to today’s dry conditions?

  2. Desert Persistence – Despite industrial-scale operations, these areas didn’t develop into major cities. Why? Did the depletion of resources, lack of water, or harsh conditions make long-term settlement impossible?

  3. Environmental Impact – If these sites once supported large-scale milling but remain barren today, it suggests mining exhausted local resources without long-term sustainability.

  4. Desertification – All photos from this time frame appear the same, void of trees, yet these were lumber mills.  And smelting takes a tremendous amount of wood to fire the furnaces. 

It’s worth digging into (pun intended) how these areas were altered by mining operations. Were any of them once more fertile? That could explain California’s strict mining policies—lessons learned from other regions.

Coal mining industrial site with smoke emissions, historical black and white photo.

Smelters at Bisbee ca. 1900

The Copper Queen Mine in Bisbee, Arizona, opened in 1880 and became one of the largest and most productive copper mines in the world by the late 19th century. It played a key role in making Arizona the top copper-producing state in the U.S.Copper Queen was one of the largest mining operations of its time, but Morenci took over in size and output in the long run.

Man-Made Desertification:
The Forgotten Forests and Rivers of the Southwest

 

1840s: California Gold Rush Begins

  • Rapid expansion of mining towns increases demand for timber.
  • Smelting Gold takes a tremendous amount of trees to fuel the fires
  • Large-scale deforestation begins to support mining, construction, and fuel needs.

1860s: Peak of Hydraulic Mining and Logging

  • Hydraulic mining becomes dominant, requiring vast amounts of timber for dams, flumes, and tunnels.
  • Deforestation accelerates, removing trees that played a role in regional precipitation cycles.
  • Forest loss disrupts the natural transpiration cycle, reducing atmospheric moisture levels.
Old mining town with industrial buildings and mining equipment in a mountainous landscape.

Ore mill and Smelter at Morenci

Morenci became the largest copper mine in North America and one of the biggest in the world. While the Copper Queen Mine was significant in its prime, it peaked earlier and declined as open-pit mining became dominant.

 

1870s: Environmental Impact Becomes Apparent

  • Rivers clog with sediment from deforested land and mining runoff.
  • Local climate shifts occur, with increasing reports of drying waterways and habitat destruction.

1890s: Broken Hydrological Cycle

  • With deforestation in Calornia, trees no longer pull moistor from the coast into mountains. 
  • Less rainfall and river flow coming into Arizona

Arizona’s Deforested Landscape (Pre-1600s – 1800s)

Arizona was once covered in dense forests. Historical and physical evidence suggests a significant transformation from lush, tree-covered lands to arid desert due to deforestation, overgrazing, and industrial mining.

Old Contention Mill in Arizona, showcasing early 20th-century industrial architecture.

 Tucson Forest & Mount Lemmon

  • A U.S. Forestry plaque on Mount Lemmon states that the