This was the answer from The Honest Kitchen, via their Facebook page:
_This article came up in a discussion on one of my dog forums: (link)
It was pointed out that the Honest Kitchen appears to use a pre-mix, given the list of minerals and additives at the end of your ingredients lists. I know you have a very thorough list on your website about the countries from where you source your ingredients, but I was wondering if you could respond directly to the concerns raised in this article about mineral and additive sources?_
Great question! We have an affidavit from our premix supplier that ALL the components are from European and North American Sources with the exception of one, which is from Israel. The components are blended right here in the USA. As with every ingredient in our diets, no part of our premix is derived from or has even been near to, China.