Experts at the Centre for the Study of Anomalous Ariel Phenomena (CEFAA) have ruled, 'It is not any weather phenomenon or any other known object made by man.'
The strange object was clearly seen by several witnesses at a copper mine at Collahuasi in northern Chile in April 2013, and eerie images were sent to the government.
Miners described how the object hovered around 2,000 feet up, making strange swoops, then seemed to transform into a silvery orb.
Jose Lay of CEFAA said, 'People in that area are well aware of the existence presence of drones.
'Fishing companies use drones. This was definitely not a drone.'
In a preliminary report based on image analysis in July 2014, CEFAA experts formally classified the object as unidentified, saying, 'Witnesses were left with the impression the object was being controlled.
'The evidence was analyzed by a meteorologist, who ruled out the possibility of the object being a lenticular cloud.
'One expert in image analysis concluded that the photographs correspond to an object that could not be identified.'