The drive permissions are supposed to come from the mount, but not the stuff inside the folder. So what's the output of
ls -l /mnt/sdc
ls -l /mnt/sdc
total 20 drwxr-xr-x 3 jeremy jeremy 4096 Jan 31 10:08 documents drwx------ 2 jeremy jeremy 16384 Jan 31 09:45 lost+found
ls: cannot access /mnt/sdc: No such file or directory
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