A Big Gaping Hole: Chuquicamata

My last stop in my stay in San Pedro de Atacama was to visit the world’s largest copper mine, the Chuquicamata mine in northern Chile. The mine is located just outside of Calama, about 1 hour away from San Pedro.
I began to get somewhat obsessed with visiting this mine. It appealed to me initially for two reasons. First, I had seen the mine on a show on the Discovery Channel called “The 10 largest holes in the world.” It featured pit caves, mines, canyons, etc and this mine was one of the largest. Second, during my two months at Universidad de Belgrano we watched The Motorcycle Diaries twice to practice reading Spanish (the subtitles). During the movie, Che Guevara meets a Chilean couple who have lost their land to the Anaconda Mining Company, a US company which owned the mine at that time. He watches them try to find day labor in the mine and nearly ends up in a fight with the foreman choosing day laborers. It was one of the first experiences that caused him to adopt his communist political philosophy. Well, that mine was Chuquicamata so I thought it would be nice to connect my trip through Chile back to my spanish courses.
My first try to visit the mine, while on my way to San Pedro from La Serena, failed when my bus arrived to town quite late and it was too late to make it to the tour. I thought that it just wasn’t meant to be. Then, I discovered my planned departure to Salta on a Thursday wasn’t possible because there are no busses to Argentina on Thursdays. With an extra day in hand, I decided to make another attempt.

The tour starts with a look at Chuquicamata town, which was a company built town for mine workers that was used until just a year and a half ago. The company provided everything from housing to schools to a hospital to a movie theater. Now, all the employees have moved to Calama because as the mine increased in size the company town became too close to comply with environmental regulations. They’ve also buried most of the town under waste rock, which is dumped as close to the mine as possible due to the high amount of fuel the large mining trucks use.
From there, we got a look at the equipment used to pick up and transport the rock. Only 0.86% of the rock is copper, and the mine produces over 1500 tons of 99.9% pure copper each day. If you do the math, this means they have to process over 175,000 tons of rock each day. First they blast a section of earth with explosives each afternoon to break it up into pieces. Next, a large shovel scoops rock and loads it into the back of massive dump trucks, which then carry it up to the top of the mine so the copper can be extracted and purified. Finally, the pure copper sheets are hauled to the port at Mejillones by rail directly from the mine.

They showed us an old shovel which can scoop about 20 tons in each shovelful. It takes 12 people to operate the shovels, and they’re the size of a building. In the modern process they use even larger shovels can scoop 50-100 tons per shovelful. The mining trucks carry about 3 shovelfuls of rock at a time, weighing up to 300 tons. The mine has 100 trucks and 9 shovels and operates 24×7. Each mining truck costs $4 million USD and lasts 10 years. The tires cost $40,000 USD and last for a year. I think each truck had 6 tires. The gas tank holds 4000 liters of diesel! The truck itself operates the wheels with electric power generated by the diesel engine. The trucks are about the size of a small two-story house and need just one driver.

The last stop on the tour is a lookout built on the top of the mine. It’s really amazing to see a pit 5km long, 3km wide, and 1km deep. Each day as they blast out more earth the length of the mine increases while they keep the same width and depth. Standing on the ridge it’s almost like being in an airplane…you can see tiny mining trucks driving along the many switchbacks in the distance. The opposite wall of the mine is so far away they look like ants crawling along.

The only disappointment of the tour is that we weren’t able to see any of the processing of the rock into copper. I suppose it’s no surprise, the process involves crushing the rock, water and chemical baths, high heat, etc. Too dangerous for tourists to be wandering around.
All in all, it was definitely worth a day to see! And it will be even easier for people in the future, we were told that our tour was the last one that needed to arrange transportation to Chuqicamata. In the future they’ll be picking people up at the company’s headquarters in Calama. The tour is free every day at 2pm and our guide was bilingual so anyone passing through northern Chile might want to see if they can stop in Calama for a visit.
















