Final answer:
The Montana Mule contains Jim Beam Bourbon, which replaces vodka found in the traditional Moscow Mule, creating a distinctive mix with ginger beer and lime juice.
Step-by-step explanation:
The type of liquor found in a Montana Mule is Jim Beam Bourbon. A Montana Mule is a variation of the classic Moscow Mule cocktail which traditionally includes vodka, ginger beer, and lime juice. The Montana Mule, however, swaps the vodka for bourbon, specifically, Jim Beam Bourbon, to give it a distinctive twist. When making a Montana Mule, you mix Jim Beam Bourbon with ginger beer and a splash of lime juice, typically served over ice in a copper mug. The copper mug is essential as it enhances the taste and keeps the drink colder. This cocktail has a robust and spicy flavor that comes from the blend of bourbon and ginger beer.