Published on: Mar 3, 2016
Transcripts - Naica crystalcave
The largest natural crystals on Earth have been discovered in two caves within a silver and zinc mine nearNaica, in Chihuahua, Mexico, according to mine officials. Reaching lengths of 50 feet, the clear, facetedcrystals are composed of selenite, a crystalline form of the mineral gypsum.
Largest Selenite Crystals In The WorldThe Naica Mine of Chihuahua, Mexico, is aworking mine that is known for itsextraordinary crystals. Naica is a lead, zincand silver mine in which large voids havebeen found, containing crystals of selenite(gypsum) as large as 4 feet in diameter and50 feet long. The chamber holding thesecrystals is known as the Crystal Cave ofGiants, and is approximately 1000 feet downin the limestone host rock of the mine. Thecrystals were formed by hydrothermal fluidsemanating from the magma chambers below.The cavern was discovered while the minerswere drilling through the Naica fault, whichthey were worried would flood the mine. TheCave of Swords is another chamber in theNaica Mine, containing similar large crystals.
In April 2000, brothers Eloy and Javier Delgado found what experts believe are the world’s largest crystalswhile blasting a new tunnel 1,000 feet down in the silver and lead Naica Mine of southern Chihuahua.Forty-year-old Eloy climbed through a small opening into a 30- by 60-foot cavern choked with immensecrystals. "It was beautiful, like light reflecting off a broken mirror," he says.
He said that the sight was beautiful “…like light reflecting off a broken mirror”. The translucentcrystals lie pitched atop one another, as though moonbeams suddenly took on weight andsubstance. One month later, another team of Naica miners found an even larger cavern adjacentto the first one.
As a professional photographer who specializes in environmentally difficult, narrow and wet canyonsworldwide, it was almost impossible to obtain clear photographs even using every trick and techniqueknow, because of the extreme ambient environment. These crystals are probably stable, as thetemperature in the cave is over 150 degrees Fahrenheit with 100% humidity. In other words, thesestructures are enveloped in steam.
As a photographer used to working in dark and dangerous environments, this experience wasunique. A human can only function in this environment for six to ten minutes before severe loss ofmental functions occurs. I was so excited while photographing the crystals that I really had tofocus and concentrate intensely on getting back out the door, which was perhaps only thirty toforty feet away.
"Walking into either of these caves is like stepping into a gigantic geode," said Richard D. Fisher, anAmerican consultant with the mining company to develop the discoveries as tourist attractions.Fisher said that most people can endure only a few minutes in the caves due to their hightemperatures.
The smaller of the two caves, which is about the size of two-bedroom apartment, is 100 Fahrenheit. Thelarge chamber, which Fisher describes as the size of a Cathedral, is 150 F. Both are locatedapproximately 1200 feet below the surface.
The largest previously known crystals were found in the nearby Cave of the Swords, part of the samemine system. Some of these are now on display at the Smithsonian Institution. The local governmentand mine owners hope to avoid removing any of the new discoveries for museum displays or privatecollections, Fisher said.
While the mine company is currently limiting visitation of the caves to scientific experts, mineralhunters have destroyed locks and broken into the chambers twice since they were first opened by miningequipment last April. One man was killed when he attempted to chop out a gigantic crystal that fell fromthe ceiling and pinned him.”The heat did him in” according to Fisher.
"We need more onsite protection of mine caves," said geologist Carol A. Hill, co-author of the bookCave Minerals of the World, who calls the new discoveries "by far the largest selenite crystals I haveever heard of."
Hill applauds the tourism plan. "Without it, the mining company would probably destroy the caves.Museums have enough crystals," she said. "Its important to preserve discoveries like this where theyoccur."
The mining company plans to air-condition the caves before opening them to the public next year,Fisher said. He adds that reducing the heat gradually will not harm the crystals.
Officials of the Penoles Company, which owns the mine, kept the discoveries secret out ofconcern about vandalism. Not many people, however, would venture inside casually: thetemperature hovers at 150 degrees, with 100 percent humidity. A person can stay inside the cavefor only six to ten minutes before becoming disoriented.
These mountains are 200 million year old limestone massifs hosting networks of caves crossed by verydeep hot and mineralized thermal waters. When these waters reached the relatively colder and closer tothe surface environments they deposited much of their salt content as lead,zinc and silver .
Groundwater in these caves, rich with sulfur from the adjacent metal deposits, began dissolving thelimestone walls, releasing large quantities of calcium. This calcium, in turn, combined with thesulfur to form crystals on a scale never before seen by humans.
In addition to 4-foot diameter crystal columns 50 feet in length, the cavern contains row uponrow of shark-tooth-shaped formations up to 3 feet high, which are set at odd angles throughout. This crystal form of the mineral gypsum, is known as selenite, named after Selene, the Greekgoddess of the moon.
When Naicas ores are no longer viable, the mine is closed and the pumping is stopped,then the caves will be submerged - and the crystals will start growing again.The only reason humans can get in the caves at all is because of the ongoing pumpingoperations that keep them clear of water.
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The city of Chihuahua is the state capital of the Mexican state of Chihuahua. It has a population of about748,551. The predominant activity is light industry.The Naica Mine is located 100km to the N.E.
Chihuahua, Mexico is home to two hot caverns containing the largest natural crystals known to man."Walking into either of these caves is like stepping into a (sweltering) gigantic geode," described oneawed observer. One of the clear selenite crystals is over 50 feet long and weighs over 55 tons.
Naica Crystal Cave Of GiantsA forest of crystals, the largest on the Planet.An unreal world, beyond imagination, beyond a dream.A cave with a temperature of 50° C and 100% humidity; aninfernal place, where man can survive just a few minutes.Still mostly unexplored. END Click to exit