Real Minero San Martinero is made using maguey San Martinero (agave Karwinskii) in Santa Catarina Minas, Oaxaca. The name San Martinero can mean different things to different producers. Some will tell you that this is the same as Barril, but that’s not the case for Real Minero. They are well-known for their agave nursery, as well as the level of specificity that they use in naming the magueyes used in their mezcal. For example, if the agave grows on a certain hill vs near a certain river, they could have different names.