I've been thinking about your post for a few days.. I've got a small impact mill that can't take much more than an inch also.
Hmmm.. A jaw crusher or a stamp mill to get to 1" to run in your small impact mill... Jaw crushers are expensive, and not the
easiest thing to make, there is one on E-bay, hand powered for a little over $500... A stamp mill, that's some old school stuff, though
my first rock crusher was effectively a single stamp. A plate a tube and a rod.
I think by the time you get something set up to bring your rocks down to an inch you're going to be kind of deep into it, and still limited
by the small impact mill...
Sitting there with a hammer bringing your rocks down to an inch sucks.. Its no fun.. My personal solution, I'm just going to build a bigger impact mill.
I will admit I've thought quite a bit on the stamp mill. I love looking at the old ones from back in the day when you had to ride your mule to work.
Build a small one out of old timbers, and if it doesn't work very well, it will at least be a nice conversation piece.
Speaking of old school, and conversation pieces, I want to build an arastra (is that how you spell it?), a pretty one, old and antique like.
It should fit in nice in a rock garden that is in the works.
The better half said "we're not having a permanent piece of mining equipment in the front yard"
I think I'm going to do it anyways and tell her its an Aztec Wishing Well.