The Phosphoria has been mined in a wide area stretching north - south from southwest Montana , through western Wyoming and southeast Idaho , and into northeast Utah .
Parts of the Phosphoria Formation of the western United States carry economic grades of phosphorus .
The Phosphoria Formation has been mined in a wide area stretching north - south from southwest Montana , through western Wyoming and southeast Idaho , and into northeast Utah .
Parts of the Phosphoria Formation of the western United States carry economic grades of phosphorus .