A *A Gold card holder is not necessarily entitled to an F (or other) Lounge unless that specific lounge is identified with the *A logo sign. Additional info below from the *A website.
Full answer regarding access to Lounges at
http://www.staralliance.com/star_all...ge_access.html
Star Alliance Gold Card Holder :
Star Alliance Gold card holders and one guest, have access to any lounge that is identified with a Star Alliance Gold lounge sign when departing on a Star Alliance flight. Note: UA's Star Gold customers have access to US Red Carpet Clubrooms only when they present a ticket or boarding pass in conjunction with international travel (outside the US).