When using landfill, resource patches are permanently lost. Removing landfill does not return it.

This is particularly annoying when using Mining Patch Planner. It neatly recognizes the according drill and floating, but if you forget to omit landfilling, it messes up the ming patches everywhere it tries to place underground belts, electric poles, and the likes.

Also the wire buoy is not recognized by Mining Patch Planner as an electric pole for automatic placement.

https://mods.factorio.com/mod/mining-patch-planner

Paving over submerged resources causing them to be removed is a deliberate design decision to avoid mining them readily with conventional drills, and I have not yet found an elegant way to "bury" them in a way that allows them to be re-exposed later.

As to Mining Patch Planner compatibility, wire buoy spacing has different demands than short or medium electric poles, so it would likely be the prerogative of that mod maker to add Dredgeworks compatibility if they see fit (and can find a way).

I see. I gues it's mildly annoying so no harm caused.

Mining Patch Planner has support for custom blueprints where this issue can be individually tackled.

Are you planning on putting your source code to git? I might catch a minute to try and tackle the vanishing resource behaviour, and having a repo would make that much more comfortable.

I'd been considering the prospect. Knowing someone would actually be interested in making a PR does help.

Also the issue tracking is much more convenient that those simple forum threads.

Publication complete.