if I had some copper. like a couple ton. and I wanted to melt it into five or ten cent incraments, where would I find the most acurate weight.
I am saying that I don't understand who sets the price per pound of metals and where to find that information.

then if I wanted to shape it into a coin and stamp a date so that I could keep track of the changing market, where would I find a coin press?

I'm a Jeweler, and believe me it's not that easy..

Fist, you would have to make a mold of the coin (out of rubber/latex- quite thick) then inject wax into it.

2.) Build a wax tree, and add the wax coins onto the stem as 'branches'.

4.)Put the wax tree into a container with space around the branches.

5.)Pour a plaster cast mixture onto the container, around the wax tree so it's covered.

6.)Bake in a kiln until plaster cast mixture is hard and wax has melted. Pour out wax.

7.) Once the wax is out you have a negative. Pour in desired melted metal and bake in kiln for about 2 hours.

8.)Remove and dissolve cast mixture till it falls off the metal.

9.) Cut the coins off the metal tree, sand, polish and off you go.

But don't do this, you'll get into deep Sh*t. And you didn't hear it from me. Oops, too late!