"The default value will result in a maximum of 2-4 metal ores per map (assuming you choose a good embark location) which may be limiting until the economy is fully implemented and desired metals can be traded for."
For my test side it is 3 metal sources (+ Adamantine), haven't checked any other maps for the default setting - so I can neither confirm nor disagree to that statement.
Ok, but that includes both a "deep metal" and "shallow metalS" layer? I think I got 2-4 assuming you get a site with either "shallow metal, deep metal" or "shallow metals" with no deep metal, etc. So I guess if you end up with a site that just says "shallow metal" it would be 1 metal not counting adamantine....
i suppose in theory you could get a site with both shallow metalS and deep metalS with the default setting but I've never found one at least for the few times I played before you could change the setting....
Anyway, am I probably still usually correct in saying that metal = 1 and "metals" = 2 given the default setting?