In the interest of giving credit where credit is due, my avatar is a scan of a hand-drawn caricature by cartoonist Jim Naylor which was done at my company's 20th anniversary dinner.
If one (or more) of the spots in a terrain area is occupied by a quarry stone, is that terrain still eligible for the Home Country gold?
We thought it wouldn’t but just to be sure, I’m asking my Kingdom Builder friends
No - spaces occupied by stone walls are not occupied by your own settlements and so you won't qualify for Home Country.
Crossroads rules on Home Country wrote:
Home country: 5 gold for a terrain area completely populated by your own settlements.
This terrain area may not contain any empty spaces or spaces with other players' settlements.
Nomads rules on Quarry wrote:
Stone walls are not owned by any player, and they generate no gold for anyone. Instead, they simply block the spaces they‘re on for the remainder of the game.