Here in Australia our soils are quite depleted of minerals and this may be the case for most countries. Always remember healthy soil, healthy plants, healthy us! So here is a mineral mix courtesy of the very knowledgeable and revered author of all things natural Ms Pat Coleby. 25kg Dolomite, 4kg sulphur powder, 4kg copper sulphate, 4kg seaweed meal and 4kg coarse salt. In the past I have mixed these exact quantities together in a drum and then put a couple kgs out in a feeder in the paddock and see what happens. You can feed this to all livestock, cows, goats, horses, sheep and pigs. Sometimes they don't touch it, other times they can't get enough, especially cows in winter on dry feed, heavy in calf. I have known other people to feed this in separate containers not mixed. Doesn't really matter if it gets wet, I just upturned the rubber feeder and discard to the ground and replenish with new dry mix. Dolomite provides calcium and magnesium for bone and muscle growth. Sulphur aids in digestion. Copper sulphate is a great natural wormer. Seaweed meal has heaps of trace elements, especially iodine and salt makes the whole mix a bit more palatable. Hope this helps.