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Yellow belts carry 15 items per second, or 7.5 items per second on each side of the belt.
Electric miners produce 0.5 items per second (1 item per 2 seconds) at the start of the game.
Therefore it takes 30 miners to saturate a belt (assuming you balance the two lanes).
Stone furnaces take 3.2 seconds to smelt an iron plate, meaning they process (1 / 3.2) ore per second.
15 / (1 / 3.2) = 48 furnaces to smelt a fully saturated belt, producing a fully saturated belt of iron plates. (Splitting the belt into two half-lanes or two half-saturated belts leads to two rows of 24, etc.)
Coal is used incredibly slowly. One belt of coal powers at least five arrays of 48 furnaces, I believe?
Conveniently, steel furnaces (and unmoduled electric furnaces) and red belts are both exactly twice as fast, so you can just upgrade both at the same time (as long as you double the iron ore input) to process double the ore in the same space later on. (Electric furnaces are 3x3 however, so if you plan to upgrade them, you will need to build your initial setup with this in mind, while steel can just be placed on top of stone.)
You can use a yellow belt of coal adjacent to a red belt of ore for the input and use standard and long inserters to take the input off the belts and then place the output onto a belt on the other side of the smelter and merge the outputs at the end of the smelter row using a splitter to recombine the outputs.
You can layer red underground belts of ore with yellow underground belts of coal in a single row using standard inserters to handle the inputs and output the plates on the other side of the smelters.
You could do 2nd and 3rd method and leave 3 tiles between sets of 2 smelters and output the plates to a belt above and below the smelters and then merge those belts onto a main output belt that runs perpendicular to the short output belts.
It all depends on how long you want your smelter rows and how compact you want your set up to be.
Steel and stone furnaces are going to be temporary set ups in any case as you'll want to switch to electric furnaces for smelting as soon as you have the power to do so.
Also steel furnaces are best as long as you can deal with the coal infrastructure. They are more compact, cheaper to construct, and just as fast. If you are going for "no spoon" (for example) you will never build them.
In the starting area at the beginning of the game I split inputs on a single yellow belt and use short lines of smelters due to tech restrictions. I just let that continue to produce while I search for a nearby area on the map that has both coal and iron ore in relatively close proximity. For that expansion I usually use the layered red and yellow underground belts method I mentioned but when I first began playing I used the side by side resource input that I mentioned that utilizes the long inserters. I also used the 2 groups of smelters separated by 3 tiles method I mentioned early in my learning experience but I don't really care for that method as it uses too much space and the material flow isn't smooth enough to suit me anymore.
Once I have electric furnaces I layer blue underground belts with red underground belts in a single line of input and output until I switch over to logistic bots. I usually leave each set up in place and just let it run and produce until I need the space for something else or the patches providing materials run out and even then I usually demolish at my leisure.
Screen shots of my current multi player save:
Start patch smelting:
https://steamcommunity.com/sharedfiles/filedetails/?id=2275638433
First expansion smelting:
https://steamcommunity.com/sharedfiles/filedetails/?id=2275638549
Staring main electric steel processing:
https://steamcommunity.com/sharedfiles/filedetails/?id=2275638882
Starting main electric Iron plate processing:
https://steamcommunity.com/sharedfiles/filedetails/?id=2275663991
Copper smelting area is currently a blue print of the iron smelting area but the iron ore input has been replaced by copper ore. As soon as I have enough beacons and modules made this will get torn up and replaced by a logistic bot and beacon set up and the entire area between the railroad stations will be filled with furnaces and roboports.
There are only 5 achievements that I don't have. No time for chit chat and there is no spoon are 2 of them and I'm not really interested in getting them any time soon. I prefer a more relaxed play experience and so does my wife (who is my teammate on the multiplayer game.)
Its no different for weaving coal and ores.
I did logistic work most of my life and retirement has been VERY boring for me. This game is satisfying for me in the same way that my job was and for many of the same reasons.
Edit - Clearly we have vastly different play styles.
Maybe my third restart already just so I can make things look nice <_<;
Good thing is, this game got endless replayability.