Currently it is not possible to vein mine conduit bundles, in EIO 8 only the bundle you aim at breaks.

I have reached out to FTB Ultimine to see if we can't gain access to an API to bring compatibility for vein mining conduits to Ultimine - we would have to reach out to other major vein mine mods if this doesn't cover everyone's use cases.

Once an API exists, I can work to add this functionality.

FTBTeam/FTB-Mods-Issues#1661

Reopening this for visibility.

Please report here if your AoE tools or vein miner mods do not work with conduits.
We've successfully created an integration for FTB Ultimine, but I'm aware that's nowhere near the full story for AoE block breaking - so let me know what other mods don't work and we can consider adding support for those in some way!