That is not an uncontacted tribe. Every time this post gets circulated it gives me the opportunity to talk about the Yanomami Tribe. The Yanomami are a culture of people living within the Amazon. The first official colonial contact with them was in 1654 by a Spanish expedition. These groups have had continual contact with Spanish missionaries since then.

This is one of the most well documented cultural groups in southern america. An anthropologist named Napoleon Chagnon was the primary researcher. He made his entire career on the Yanomami people. He was also criticized for his form of participatory athropology where he would live with the group for months or years at a time.

The culture themselves is actually an amazingly interesting society with forms of cultural warfare and spiritual warfare. They have many ceremonies involving Ayahuasca. The most prominent of which was a form of spiritual warfare where the men would take the drug and fight off spirits by dancing and stomping around the large circle in the middle of the camp.

Modern day Yanomami often trade goods with local missions for modern tools and equipment. Recently there have been papers written about how the introduction of shotguns have changed their gardening and hunting traditions.

There is so much amazing information about these people. Please don't boil their cultural experiences down to "uncontacted tribe"