He is remembered for his heroism following the Snaefell Mine Disaster of 1897, during which he displayed extraordinary courage and endurance and for which he received the Medal of the Honourable Order of the Knights of St John of Jerusalem.

The fire would have continued burning so long as oxygen was present, the process forming carbon monoxide which filled the lower parts of the shaft.

Kewley immediately organised and personally led the rescue mission, and with complete disregard for his own safety descended the mine shaft in order to render aid to any who might be living and to recover the bodies of the dead miners.

Kewley and some other miners re-entered the mine in order to retrieve the body of Robert Kelly which was situated at the 130 fathom level, and where the presence of gas had made recovery impossible.

The medal was rewarded for the self-sacrificing exertion and distinguished bravery displayed under the most trying and hazardous circumstances in their heroic efforts to save life and succour the helpless in connection with the disaster.

Governor Henniker was a Knight of Justice of the Honourable Order and as such he had been requested to make the presentation on behalf of the Prince of Wales.