I'd question whether they even realize that they are supposed to be feeding the animals minerals at all, at least when they moved in (although it wouldn't surprise me if the free hay person helped them get some minerals too, I'm guessing someone in the area cares about the animals but it's not any of the troons). Hopefully they get some selenium supplements; most soils west of the Rocky Mountains are selenium-poor. Selenium deficiency in sheep gets you white muscle disease, where the sheep slowly loses strength, wastes away, and dies. The meat's unsalvageable, too. I don't know what it gets you in alpacas, but I guarantee that it is nothing good. White muscle disease tends to strike in pregnancy, when the needs of the developing lamb overtax the ewe's deficient selenium supplies, and results in prolonged, difficult lambing that the lamb often doesn't survive. Surviving lambs have white muscle disease themselves, and have obvious trouble standing and weak little baas. Without the ability to stand or suckle vigorously, they are likely to die quickly of hypothermia if not cared for properly (newborn lambs rely on burning glucose to keep their body temperature up and will die of hypothermia before they can starve to death).