Properly Install UOArchitect to your ServUO files
Run UO Architect.exe > Connect this brings up the login manager. Click Add Name doesnt matter, Type your IP or if the server is local 127.0.0.1, For the port UOA uses 2594 as the default UOA port. User name needs to be the same as your admin account user name. click save. then click on the new entry in your server listings and type in your admin account password and click connect.
File > Import > UO Architect Design (.uoa) Then navigate to the orb_mineshaft.oua file and open it.
Navigate the list of buildings, select the mineshaft and click Build. Click where you want to build it.