There is also the Minotron on p302 that is a bit more info. I don't see them as being very different on Hyperborea than other sources, yet they do have their own island. They are very much the greek creature of legend. I just last Friday finished up an adventure in which I used Female Minotaurs on the Floating Isle of Paradoxon and the Cloud City as allies of the Amazons. They were guardians of the Queen and classed as berserkers to make them a tad more ferocious!
“How can I wear the harness of toil
And sweat at the daily round,
While in my soul forever
The drums of Pictdom sound?”