Is this natural or manmande

[selvak]

Is this natural or manmade

Hello Experts,
while excavation one side of the corner i found some shaped stone under 8 feet, pl check the videos and photos.., with nokta pinpointer when i touched that stone its not giving beep signal but when i took away from stone its start beep continously..,but with gold ring its giving normal beep signal.., so i need your opinion on this issue.
thanks

 

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