Underline infinitive phrase and how is it used

A few prospectors brave enough to explore the frozen interior found gold in the summer of 1896.
To explore the frozen interior adj

3 answers

Correct.
Your identification of the infinitive phrase is correct, but it's not being used as an adjective.

The word immediately before the infinitive phrase (enough) is what part of speech. What kinds of words or phrases can modify this?

http://grammar.ccc.commnet.edu/grammar/phrases.htm#infinitive
Oops. Writeacher is correct. I missed the part of speech. Still not quite awake here yet.