Thanks for the explanation.
I had also thought that PRB was responding to the NOT drill news, but since NOT was weaker on the news I thought it might be something else. If the mineralization found on the NOT property is so close to the PRB property, possibly even better, more extensive mineralization might be found on PRB claims - and due to the very low market cap for PRB, any find could result in a much greater share price. Also, PRB's downside appears limited by the other properties and royalty interest in the Goldex mine.