[1.15.2] Generate Ore Near Specific Block

[kykaro]

Hey guys,
I am working on a mod that adds new sets of ores to the game, I figured that would be a decent introduction to modding. So far I have been successful in adding an ore, its resource and all tools and whatnot. Now that I have a general understanding of it, I would like to see if its possible to spawn that ore only in the presence of a specific block, in this case lets just say within 5 blocks of lava. I know you would have to loop over all blocks around the ore and check for the specific block, but I am not sure where to do this. From a google session I found references to a WorldGenMinable class, but that seems to be from an older version as I cant find that in 1.15.2. Any suggestions on what I would have to override in order to achieve this? Ideally, I would like to make a new Placement Config like CountRangeNearBlockConfig where it would have the same features as CountRangeConfig,  but with 2 additional variables for the block to check for and the range to search. That way I can set it individually when I add my feature. Any suggestions or if you know of a mod in 1.15.2 that has an ore block that has similar conditional spawning that I could look at would help. 

Thanks

[Draco18s]

I could tell you how to do this with Custom Ore Generation, but it needs updating, and I can't do it alone.