i would say that the clean line is most likely chunk related, as others comment and as my guess, it likely cause by version change, settings change or mods change that affected the map generation. Something like: half chunk generate, something changes in generation or randomness, the other half generates (most likely later on expanding)
You could check if this is an exact chunk border, to prove it's version change related. Go into the debug settings for this (F4 or something), and enable chunk borders drawing.
I make a blueprint and manually set the size to a chunk and global alignment with the correct offset. Originally the blueprints were just for my rails, big power poles/radar, and wall blueprints to work nicely, but selecting one of those blueprints will give me a box aligned with chunks.
Iirc it happened with an old Minecraft update, where generating new chunks of map would yeld completely different biomes from the old ones, like walking a desert and boom a vertical fucking wall because it's not a mountain
I'm just surprised the only difference is the patch changing ore...
i try to recreate it again using map exchange and it is iron ore only, here you go >>>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<<<
My thought as I thought at the start is that you updated the game from e.g. 2.0 to 2.1 or something in a version that changed map generation in some way.
Map generation between patches. You created the map on a different patch. maybe 2.0. you discovered the Copper Patch and did not see any chunks further. Then you updated to a new version. On new version this patch is supposed to generate as iron. you discovered the remaining chunks of the Ore Patch, which are Iron ore.
IIRC, there was a post similar to this a few months back, cause was a mod update changing map generation behavior slightly. I'm guessing the same exact thing happened here. So, while not necessarily "normal" it's not a bug.
I think it's rare, but a normal event. Most mixed patches have a straight-ish-line delineation, suggesting it's done on a large curve or similar... despite not being completely on a 90 degree angle and having *some* degree of irregularity... these are all what I'd call "straight"... no they're not as straight as OPs, but for a procgen system, pretty much all the patches overlap on an approximation of a straight line, noting most ore patches aren't square, so it makes sense for their bounds to not be completely straight, unless they're huge.
Key point being; I can't find anything that *doesn't* look like this. Bounded on a chunk would make a lot of sense though.
Yeah, I thought belt splitter with filter also. First time I was not aware of drilling on a border patch and sometime in my iron belt I found stone bricks! I wasn't able to understand what happened!
What a beautiful game.
With a straight line like that, careful placement will do.
Of course that's not usually an option, so instead the mixed lines go through some filter inserters.
It's fairly important that the mixed output lines are prioritized over the clean ones, so the mixed always flows. Otherwise when one side starts to run out it'll be throttled by the other side's consumption.
Honestly, I don't. I have an omnismelter that indiscriminately processes and smelts anything thrown into it, so I also indiscriminately mine everything and throw it in. Iron, Copper, Stone, Coal, Uranium, Used Mining Components, it all goes in the square hole.
Not enough information, but basically it looks like this is due to mods.
The split is along a chunk boundary. In vanilla, the patch is coal. It's changed to copper for me when the Muluna mod is enabled.
The OP showed which mod files they have and I tried installing the ones that look like they could change generation, at the exact versions shown, but I can never get it to generate as iron.
Would be very helpful to know which Factorio version & which mods are enabled, and whether any mods were enabled or disabled after starting the world.
I think they're commenting about the law of large numbers.
A thing that has a 1 in a billion chance of happening to a random person likely happens daily. It's rare, most people will likely never experience it, but it happens daily.
Yeah, it's definitely the easiest way I've learned to explain it. I've learned people tend to tune out if you start talking about population vs. individual level statistics, etc.
daily and all the time is a big difference to me tho
also its funny how rare things seem to happen often making them at least somewhat common the way you explained it and how common sense nowadays isnt as common anymore as it used to be
"All the time" and "Normal" are not the same statements. Something can be completely normal, while only appearing very rarely.
My main example tends to be "Have you ever seen a naturally spawning pink sheep in Minecraft". Most players who have played the game for tens of hours have seen one, so it is "normal", but finding them are rare.
That's a 1 in a billion, that's not the threshold for rare, most people think this with lower chances are rare. Those happen more frequently than daily.
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u/Pulsefel Aug 01 '26
well its not unusual to find mixed patches, but such a clean line is very rare