[Ger-Poland-Volhynia] Occupation Translation/Explanation

[gpvjem]

    I am confused regarding the occupation (below) of a member of the Marsch family in Grünberg, Niederschlesien in 1843.  I would be grateful for any translation or explanation forthcoming.  The information was obtained from the Grünberg Wochenblatter of that time.
'General-Pächter der Grünberg'schen Kämmerei-Güter Lieutenant'

Thank you, 
John Marsch