The Lost Mine trailhead is well-marked
on the main park road into the Basin,
just west of Panther Pass. The
small parking lot can fill early
in the day sometimes.
At times, recently, there have been mountain lion warnings for this trail. As always, use a little common sense and check with the park service for current warnings. Attacks on humans are extremely rare, but have happened. Here's an NPS press release (link looks dead now-phil) from one in 2003. NPS has some information on mountain lions here.
Last updated: 4/11/2009