It's quite simple, really. You don't mount the game folder in DosBox, instead you mount the drive itself, like
mount c c:\
Then you go to the mounted drive c: with simple
c:
Switch to the game folder manually with
cd gamefolder
Replace gamefolder with the actual folder name. Let's say it's located in c:\games\Gold, then it would be
cd games\gold
That should fix the issue with saving, because then the game will be able to find it's folder to save into. In the end the entire command row should look like that (for putting at the end of dosbox.conf file for running at startup each time you start DosBox):
mount c c:\
c:
cd games\gold
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