Sante Fe Spirits was perhaps the first American distillery to turn to that all-American flavour of mesquite for its whiskey. Its Colkegan Single Malt, named for distillery owner Colin Keegan, uses a combination of 30% mesquite-smoked barley alongside 70% un-smoked malted barley. At 7,000ft elevation, Santa Fe Spirits also utilises a unique maturation system with a climate-controlled warehouse – not for temperature consistency, but rather for consistent major temperature changes.
https://scotchwhisky.com/magazine/features/20710/10-american-single-malt-whiskeys-to-try/