Here is a GREAT mixture that makes 200 lbs for only $23. It has been passed along from several members of the QDMA.

WHITETAIL DEER HOMEMADE MINERAL MIX RECIPE
Printable version
Ingredients: Makes 200 lbs. for about $23.00

1 part Di-calcium phosphate, this is a dairy feed additive bought at feed stores.
Comes in 50lb Bags at around $11.00 you need one bag.

2 parts Trace mineral salt, the red and loose kind without the medications.
Comes in 50lb Bags at around $5.00 you need two bags.

1 part Stock salt, ice cream salt.
Comes in 50lb Bags at around $2.00 you need one bag.

Directions:

-Use a 3 pound or similar size coffee can to use as your measure for each part of the mix.

-Mix all together well but not until read to use, keep ingredients separate until ready to put to use.

-Dig or tear up a circle in the soil about 36 inches wide and about 6 inches deep.

-Mix your mineral mixture with the soil.