Rockhound , you have part of it correct, woodsman87 not so .
I don't know a lot about seed , but I do plant a lot. Take for instance eagle beans vs your run of the mill cheap ones at the coop. Eagle grows head high, ever see a regular ol bean do that . It produces much more tonnage per acre with much more nutrition.
Now I do know a lot about salt and minerals. You are correct about the Redmond number 10 fine. it does come from the same mine, so does road salt and table salt (realsalt). The number 10 is used primarily for agricultural purposes, mixed with feed or fed in an enclosed environment ie barrel or feeder.
If you put it on the ground it leeches into the dirt with each rain , getting further from the surface with each rain. Thats why you see deer digging the holes ! trying to get what little salt/minerals there is left ( and eating more dirt each time ). They are getting less benefit of the minerals each time also. The Trophyrock chunks last much longer and the deer licking on them get much more benefit of the 65 plus minerals with each visit.
picture yourself with a spoon of sugar, tastes good by itself, tastes good on your cereal, plus you are getting the benefit, ( if there is a benefit to sugar ), now dump it on the ground, pour some water on it, ie rain , then get you a spoonful, not only does it taste bad but you are getting less sugar !Next rain you get even less benefit, But you are digging a big hole that really looks good !
Now TR has a new ground product that sells somewhere between the number 10 and a TR (per pound ) It consists of small particles up to about marble size. It will dissolve faster than the TR but will last longer than the fine number 10 .It was brought out due to hunters request for it so they can mix their own mineral site. its good, cheaper but not the same as a TR chunk.
BTW , Lee , Tiff nor Michael are in any way paid or affiliated with TR. I know that for a fact, If they tell you its good its because they have tried it themselves . Didn't want this to sound like a commercial just to clarify.