Bedrock ores are mineable with the Ore excavation mod: the problem is that when the expected yield diminishes by 3 ore in the counter, in reality the bedrock ore a lot more ore blocks, half a stack or something like that, not a constant number as it seems (tested with iron ore).

This happens with both Tico pick and Vanilla.

Running with Bedrock Ores-MC1.12-1.2.6.41
And OreExcavation-1.4.118

Closing this one, as Oreexcavation is basically mining ores from every bedrock ore connected, so it is NOT an issue.