Here's some numbers I was able to find on total carbon lifecycle for the energy types: https://www.ipcc.ch/site/assets/uploads/2018/02/ipcc_wg3_ar5... - Coal is 68x more CO2 than Nuclear https://unece.org/sites/default/files/2021-11/LCA_final.pdf - Coal is 165x more CO2 than Nuclear https://ourworldindata.org/safest-sources-of-energy - Coal is 161x more CO2 than Nuclear
Uranium is often pumped out of the ground after being chemically extracted.
Coal is almost always carted out after being blasted.
Look into things like lithium mining (for batteries; yes, I am aware that other options exist, but lithium is still a very common one). That one is straight up nasty.
Enriched fuel can be gotten from Urenco/Orano or you can build Candu units otherwise. Over half of global uranium mining is already in situ (with several exceptions, Canada among them for good reasons) which is more or less ok enviromentally. Especially considering nuclear requires least amount of mining vs alternatives per kwh. "Nuclear being a clean energy is a myth as far as I know" - then you should inform yourself better. You can start for example with UNECE report https://unece.org/sites/default/files/2022-04/LCA_3_FINAL%20...
Trying to say nuclear mining is as bad as coal without even trying to inform yourself about the topic is fascinating