Does anyone have a way or contacts for minting coins?

My concern with the current system is that the amount of material in the coin doesn't determine the purchase price; e.g. a 1/10oz would be pro-rata more expensive than a 1/4oz or 1oz coin. This for me is "using false scales".

I therefore would like to see if it is possible to start a coin where the weight of material determines the price. I am thinking about a coin series for the Torah community along the lines of 1/10oz, 1/4oz and 1/5oz gold and silver coins...