How get chance to spawn ore

[Dew]

I have OreGenEvent.GenerateMinable event, I need to get a chance to spawn (generate) every ore that is processed in this event. Also e.getType().name().toString() is name this is the same block name by which it can be entered in the Block.getByID? 
forge 1.12.2 59(recommended)

[JimiIT92]

1.12 is no longer supported Please update to a newer supported version (like 1.19 or even better 1.20).

If you absolutely need to use 1.12 you can try to ask someone on the discord server