As explained by Boards of Canada: Kaini Industries is a company that was set up in wikipedia:Canada (by coincidence in the month Mike was born), to create employment for a settlement of Cree Indians (Forcefield 1998).
[Simon Wilkinson] suggests that this might be a recording from a native American ceremony, including what sounds like someone with a drum - see also comments on Pete Standing Alone.
In fact, the company was called "Kainai Industries" Ltd. It was located on the Blood Reserve. There was also a Kainai Cooperative Enterprises. "Kainai" means "many chiefs", and the Kainai are also known as the Blood Nation. More about this at  and . [DC]