Well, I did a little research on filling tires, and went by the John Deere dealership to ask them what they thought. The dealer didn't suggest doing it with water or antifreeze and water because of the rusting of the rim that would occur, but he said he knows a lot of his customers who have.
I also found this article on the web
http://www.orangetractortalks.com/2009/01/comparing-types-of-liquid-tire-ballast/ that talks about it, and I have decided I am definitely not going to do it. If I decide I need more weight, I will spring for wheel weights instead. So far I have not been sideways on any slope where I was concerned at all with tipping, and I definitely don't do that with a load in the loader. And I have picked up a couple of things with the loader and a chain, but I attach it to both ends of the loader so it won't shift.
All that said, I appreciate everyone's comments about the safety factor of added weight in the tires. I am not a risk taker at all and will go out of my way to prevent myself from getting in an unsafe predicament. When I get to the dam building stage, and start grading it with the tractor, I will then determine if I want to add wheel weights or not.
I missed answering one question earlier about water holding properties of iron ore. As dense as it is, I can't see how water could get through it, unless there was a crack. I really don't have a situation where I can test it at this time.
I have wondered about the large slab of rock in the pond area and if it would leak around it. I'm not sure how I could tell unless maybe I was there when it first got submerged and see if there are any air bubbles rising from the area. It may be a moot point if the solar powered water pump works as advertised. I should be supplying about 3 to 8 gallons per minute depending on the sun and clouds.
