Bisbee Copper Mining
The Worries of a Bisbee Copper Miner
A Little History
In 1877, Bisbee's Copper Queen Mine opened where miners would extract over eight
billion ponds of copper, almost 3 million ounces of gold and over 7.5 million
ounces of silver before the close of the mine in 1975. Sometime around 1951,
Phelps Dodge Corporation took a stab at the more cost effective open-pit mining
and started work in the Lavender Pit, named for mine manager Harrison Lavender
(not its lavender-tinted walls). The Lavender Pit produced an estimated billion
tons of copper (along with substantial amounts of gold, silver and "Bisbee Blue"
turquoise) and was closed in December 1974. In 1976, almost one hundred years
after mining began there, the Copper Queen Mine opened to the public for tours.
Miners who once worked the mine themselves guide the tours and offer insight to
A copper miner's "office" is a cool (47o year-round in upper levels),
dark, damp, cramped space, but these are minor discomforts compared to some of
the other costly, time consuming, or life-threatening problems one can encounter
in the mine. One problem that arose in the Bisbee mine was the obstruction of
piping due to dense selenite crystal growth. Bisbee water, rich in calcium
sulfate, would flow through the pipes where the crystals had a place to form.
Under the right conditions, a pipe such as the one pictured could become
completely obstructed in as little as a few years. A large-scale version of
this occurs in Mexico's cave of swords where the result is awe-inspiring, not a
Another equipment problem resulted from a chemical reaction that was actually beneficial when extracting copper from the mined ore. In a process called copper cementation, pieces of scrap iron are placed in a copper rich solution, and the iron is dissolved away and replaced with copper. This handy method for extracting valuable copper could wreak havoc on iron track rails, nails and tools that were consistently exposed to the copper-rich mine water.
Dynamite blasts are an obvious source of danger in the mine, but not
only for obvious reasons. Of course premature blasts, fire, shooting rock and
cave-ins were on a miner's mind as he blasted away, but he had to drill his
blasting holes carefully so as not to damage support structures and displease
"The Committee". In a copper mine, where the real money is made for every ton
of bonus material you produce above the base, time really is money. If the next
shift (The Committee) has to waste time repairing what you've broken, they might
very well meet you for an inspirational chat in the parking lot.
In the early days of copper mining, when the work was done mostly by
hand, drilling into the silica-rich walls of the mine gave rise to even more
dangers and health hazards. Using a stoper (a machine aptly nicknamed the
widowmaker) a miner drilled into overhead rock. Any loose material of
substantial size could be the immediate end to the miner's life, but the tiny,
airborne particles were just as dangerous over the long term. Long-term
exposure to silica dust resulted in silicosis, a progressive, sometimes fatal
lung disease. Even if it didn't kill you, silicosis, which causes scarring in
the lungs, could be disabling. Later, wet drilling eliminated this problem by
soaking the silica dust, therefore eliminating the possibility of breathing it.
Many people would immediately call pest control experts if they
discovered rats in their workplace, but the crazy copper miners actually
befriended them. Actually, it wasn't so crazy to become friends with a rat when
you realized they could detect dangers you couldn't. Similar to the canaries
that coal miners kept in their work areas, rats were more susceptible to a rise
in dangerous gas levels or a drop in oxygen levels. They could also sense
ground movements that might
signal a cave-in. The support beams within the work area, could not keep the
ceiling from coming down- they were designed to let out enough warning creaks
and moans to give you time to get out, hopefully. If the rats started running
towards the entrance, you'd better follow close behind.
As if the aforementioned problems weren't enough, the addition of electricity to the mines, brought additional hazards. The trolley wires overhead could do some serious damage to a damp miner. The trains that ran within the mine to carry material could also jump their tracks and crush a miner.
While mining is very dangerous work, the Bisbee Copper Queen mine maintained a more than decent safety record. Between 1950 and 1975 approximately 16 miners were lost in all Bisbee mines combined (China may currently lose 16 miners a day!). Some of this can be credited to Bisbee being one of the first western mining towns to use wet-drilling to prevent silicosis. The U.S. Department of Labor's Mine Safety and Health Administration keeps daily fatality reports and it was amazing to see the number of mining fatalities there have been in recent years. Even as we become more safety-conscious and technology advances, mines are still a dangerous place to be.
U.S. Department of Labor Mine Safety and Health Administration
http://www.msha.gov/S&HINFO/SILICO/SILICO.HTM (Silicosis Info)
19th century copper leaching process
John Decker, gypsum pipe
Copper cementation process
Ron McGinnis, Miner/Tour Guide, Bisbee Copper Queen Mine
1. Crystal obstructed pipe given to Roger Weller, Cochise College, by John Decker of Bisbee
Passage through the Cave of Swords, Naica, Chihuahua, Mexico. Photo by Vladamir
3. Iron track railing turned to copper through copper cementation. Photo courtesy of Roger Weller, Cochise College