"New information has emerged from letters written in 1776 about excavations at Silbury Hill and published for the first time in the new volume of the Wiltshire Archaeological and Natural History Magazine.
"Local historian, Brian Edwards tracked down two letters, written in 1776 by Edward Drax to his friend, Lord Rivers, about excavations at Silbury Hill. Edward Drax from Bath , had hired a team of miners from the Mendips to dig a shaft from the top of Silbury Hill, to the centre of the hill, 125 feet below.
"The letters record that at first, the miners found little but large chalk blocks and deer antler. However, at 95 feet, some 30 feet above they expected the base of the mound to be, the miners discovered what Drax records as a 'perpendicular cavity' that was 6 inches across, and that 'we have already followed it already about 20 feet, we can plumb it about Eleven feet more'. He says that ‘something now perished must have remained in this hole to keep it open’."