I get asked about the mineral tubs we use and if the sheep figure out how to use them.
This tub is a covered, cattle mineral tub purchased several years ago from our local farm supply store. There are three compartments. In two compartments I place loose salt with a scoop or so of loose mineral stirred in. In the other compartment I put kelp with a heavy scoop or three of loose mineral mixed in. The loose mineral is my own homemade mix.
The ewes do just fine getting what they want.
I have no doubt they learn from each other too.
And when word gets out that the tub has been restocked (especially if it has been empty for a few days)....
...everyone wants a taste.