The deposit was discovered in 1954 by a United Uranium NL exploration team, led by Joe Fischer, with a ground radiometric survey.
2.
Some people have termed the approach " environmental correlation ", associated with using stratigraphy, digital terrain models and gamma radiometric surveys, to predict and map soil properties.
3.
In 2005, the Malagasy Government conducted aerial magnetic and radiometric surveys of the area, finding the amounts of Thorium and Uranium increased as one moves west, though this could be due to " transported cover " on the Easter side of the area.
4.
A wide variety of interpretations for the structure have led, in the absence of any hard evidence, to a broad range of proposed dates for its construction, from 4, 500 BC to around 1485 AD . In archaeological excavations, no coins or other artefacts have been found on or around the structure to aid its dating, and no evidence has been gathered through radiometric surveys.
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