This post applies to all 4 of your mods that add a new ore (Titanium, Tungsten, Lead and Zirconium).
I'm currently playing through Space Exploration (no K2) with all 5 of your recipe-changing mods, fairly enjoyable so far but I'm facing a problem now that I started deep core mining on Nauvis (which I started doing because all those additional ores made Iron a lot rarer on my map). There's no way to get rid of your ores to keep the thing going.
Iron, Copper, Stone and the SE ores (Holmium, Iridium, etc) used in crafting can all be made into landfill at purposefully terrible ratios (50 ore to 1 landfill) in recycling facilities (regular assemblers for Stone), providing an excellent way to get rid of any excess and keep core mining going for a good amount of time/later on indefinitely before manual intervention (and Coal, Vulcanite, Uranium are pretty much consumables, easily dealt with); but Titanium, Wolframite, Lead and Zircon have no such recycling recipes on top of being consumed less than the big 3; constantly blocking core mining.
Perhaps the basic core fragments should produce less of those ores as they're used a lot less than Iron, Copper and Stone in research yet produced in batches of 5 per core fragment just like Copper and Stone. Maybe 2 or 3 of each ore per fragment would be more sane? Even that might be too much, I'm not sure. All I know is 5 of each per fragment is definitely too much, with no external source of any kind the belts for your ores barely move while my Iron, Copper, Stone, Coal, Uranium and Vulcanite belts are always empty.
The thing I know for sure is that recipes for turning 50 of them (or even worse ratios) into landfill should be added to recycling facilities just like for the other crafting ores; as it stands core mining is pretty much unusable with any of your mods besides Silica & Silicon, it will always come to a stop really fast.
Should be a fairly easy fix as far as I understand factorio modding, hopefully you're around and not too busy.
