If you have a situation in your garden where you feel that a product such as Humate would be useful, it would probably work better if you mixed it with the finished compost from your heap just before you need to apply it.

If you look at some of the 'special' growing medium recipes you'll see things such as 'one bucket of mature compost, one cup of lime, one tablespoon of slow release pellets 10-10-10' etc. All added just before use with plant material - otherwise it can leach away with watering, rain or snow, even in a compost heap.

When you come to take plant matter from the area that you treated with compost and Humate, later, those plants will have the mineral uptake from the product and you will be adding those minerals to the compost heap.