The placement of bronze (how many and where) is handled by the mapscript you choose and not by the mod itself.
Playing with the game on a small map or with the option that doubles resources (Blessing of Amathaon) enabled can reduce the frequency of some resources, because you're effectively asking the mapscript to place more resources than places for which it can find. When a mapscript can't find a tile for a resource (according to the rules for placing that resource) it stops placing that resource and moves on to the next one.
I don't know whether Bronze is specifically affected by this; resources are placed in a certain order and being later in the list makes a resource more likely to be reduced (or eliminated). On a small map the placement of Reagents can become problematic, and some times none is actually placed on the map. (This affects some mapscripts more than others, because the exact size of the map under a certain size option is defined by the mapscript itself.) There may be other resources that are being reduced but not eliminated, and it's possible that Bronze could be one of those resources.
I don't play with Blessing of Amathaon enabled, so I can't say from experience which resources or on what map sizes problems placing resources will arise. I can say that, because double the normal number of resources are being placed, there is a much greater chance for resource placement problems to arise for any given map size.
So, if you are having problems with resources not appearing or being scarce then you should consider turning off Blessing of Amathaon (if you use it) or playing on a larger map. Of course, neither of those actions will guarantee that you have access to any particular resource.