I've done as I alluded too earlier and modified your mod and incorporated it with my own raws. I toned down the bar production by dividing all your values by 5 which came out just about evenly on everything except Galena and Tetrahedrite which I rounded to 3/1 output, also I cut Gold nuggets to 3 bars to keep gold rare, the max bars produced is 6 from Copper nuggets and most are 4 bars. I also went into the item raws and doubled all the material requirements for items so a plate mail suit would be 6 rather then 3 bars. So the net effect is about a doubling of the amount of stuff that each unit of ore can become. I might reduce vein abundance as Granite26 suggests if play testing suggests its necessary.
I've also got my own system of Alloy creation which rebalanced all the alloy formulas and metal values along the principle that most alloying should produce a small increase in net value, some of the prior supper reactions like bronze and zinc are toned down as well. Damage values are shifted to improve bronze and open up several other metals for viable military use. All alloys are formed in binary fashion by combining 2 bars of metal. This can be repeated to create 'double' alloys which can be created by either a 4 bars 'direct' reaction or a 2 bar 'split' reaction in which one or more of the reagent bars is itself an alloy. For example Black Bronze created from 1 Electrum and 1 Copper is equivalent to 2 Copper, 1 Gold and 1 Silver. I had to drop all ore to alloy equations due to the different yields, equations which accurately preserve trace metals and logically reflect yields were far too numerous and resulting in too many residuals. All ore is smelted to pure elemental bars after which one can archive any desired alloy with a single reaction using either a 2 or a 4 bar reaction. The benefit is that theirs no waste or 'magic' everything balances and is accounted for. I'm also considering adding un-alloying, aka separating alloys back to pure elements.
In addition I dropped all fuel requirements for bar 2 bar alloying, fuel is required only for Smelting from ore which will now be much less fuel demanding because of the high bar output, on top of that Coal produces considerably more coke at Lignite 3, Bituminous 5 and a new Anthracite which is also 5 but requires no fuel to turn to coke (The coking process is to remove impurities that are not present in Anthracite), Anthracite is also present in Metamorphic rock which was previously fuel-less making these maps FAR more attractive.
I've included 8 new metals, some drawn from other mods, others from wiki searching, half are new gold alloys intended for jewelery and craft, three others are Copper based and the last is a new form of Pewter.
If anyone would like to have a look I can upload it to one of the DF file sites