Tombstone in Cochise County, Arizona — The American Mountains (Southwest)

Leaching Control Panel

Used by the 71 Minerals Co, in 1970's

Photographed by James Hulse, June 16, 2024

1. Leaching Control Panel Marker

Inscription. This control panel was used for the pressure lines. The mined ore is usually crushed into small chunks and heaped on an impermeable plastic or clay lined leach pad where it can be irrigated with a leach solution to dissolve the valuable metals. The crushed ore is irrigated with a dilute alkaline cyanide solution. The solution containing the dissolved precious metals in a pregnant solution continues percolating through the crushed ore until it reaches the liner at the bottom of the heap where it drains into a storage (pregnant solution) pond. After separating the precious metals from the pregnant solution, the dilute cyanide solution (now called "barren solution") is normally re-used in the heap-leach-process or occasionally sent to an industrial water treatment facility where the residual cyanide is treated and residual metals are removed.

Topics. This historical marker is listed in these topic lists: Industry & Commerce • Science & Medicine.

Location. 31° 42.672′ N, 110° 3.994′ W. Marker is in Tombstone, Arizona, in Cochise County. It is at the intersection of East Toughnut Street and South 5th Street, on the left when traveling west on East Toughnut Street. The marker is located on the grounds of the Good Enough Mine Tour. Touch for map.

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Marker is at or near this postal address: 501 E Toughnut St, Tombstone AZ 85638, United States of America. Touch for directions.

Regionally, this marker is in the Sky Islands

and in Southeastern Arizona.

It is also in the American Southwest.

Globally, it is in North America,

the Western Hemisphere,

the Western World,

and the Anglosphere.

Historically, it finds itself in what was once New Spain

and also the Gadsden Purchase.

Other nearby markers. At least 8 other markers are within walking distance of this marker: The Tombstone Good Enough Mine (a few steps from this marker); The Mines of Tombstone (within shouting distance of this marker); Million Dollar Stope (within shouting distance of this marker); Russ House (within shouting distance of this marker); Tombstone Engine Co. No. 1 (within shouting distance of this marker); Southern Pacific Train Depot (about 300 feet away, measured in a direct line); The Rose Bush Story (about 400 feet away); Rose Tree (about 400 feet away). Touch for a list and map of all markers in Tombstone.

The Leaching Control Panel and Marker image. Click for full size.

Photographed by James Hulse, June 16, 2024

2. The Leaching Control Panel and Marker

The view of the Leaching Control Panel Marker in the tour grounds image. Click for full size.

Photographed by James Hulse, June 16, 2024

3. The view of the Leaching Control Panel Marker in the tour grounds

The Good Enough Mine entrance image. Click for full size.

Photographed by James Hulse, June 16, 2024

4. The Good Enough Mine entrance

Credits. This page was last revised on June 28, 2024. It was originally submitted on June 27, 2024, by James Hulse of Medina, Texas. This page has been viewed 199 times since then and 24 times this year. Photos: 1, 2, 3, 4. submitted on June 28, 2024, by James Hulse of Medina, Texas.