Derramadero Agate is namend after its finding-location, Rancho El Derramadero. Today this ranch is named El Agate. From this finding - location agates were traded since the 1950ies. The material is showing a lot of similarities to Coyamito-agates both in structure and colour.
Further informations are given from Brad L. Cross in his book “The Agates of Northern Mexico”, page 46 - 48.