The photo looks like it's of a cask firing at Ariake Sangyo [0], which manufactures barrels for a variety of uses. About 10 percent of their barrels go to domestic whiskey producers, and the rest to shochu. Yamazaki has their own cooperage, so that barrel isn't going to them.
However, Yamazaki does use a variety of different barrels, including wine casks for finishing, sherry casks, mizunara (Japanese oak) casks, new American white oak puncheons, hogsheads made of used barrels, and ex-bourbon barrels. AFAIK they use a variety of char levels on the barrels they produce in house and on re-chars.
However, Yamazaki does use a variety of different barrels, including wine casks for finishing, sherry casks, mizunara (Japanese oak) casks, new American white oak puncheons, hogsheads made of used barrels, and ex-bourbon barrels. AFAIK they use a variety of char levels on the barrels they produce in house and on re-chars.
[0] http://www.ariakesangyo.co.jp/, mis-captioned as a distillery here: https://www.masterofmalt.com/blog/post/qa-brian-ashcraft-aut...