After finding three coins, Mr Haigh said he decided to head back to his car at the top of the field, where he heard the “faintest of signals”.
“At first I lost the signal, then using my probe I located a strong signal,” he said.
“Hands shaking, I gently wiped the earth off the round disc in my hand and revealed a bright, shining 2,000-year-old superb gold stater with a Celtic horse and pelletal sun design.
“Marking the spot with a marker, I trudged back to my jeep and rested for half an hour.
“I just couldn’t believe it – I’d struck lucky again. I was even too tired to do the ‘gold dance’ favoured by detectorists whenever they find gold.”
Mr Haigh added that he “unbelievably” found a further four gold coins of similar design in the field that afternoon.