The Lost Mine Trail is a beautiful hike. It is not a flat trail, but a hike up a series of mountain sides. The trail is extremely well-maintained and there are plenty of rest stops. There are a number of breathtaking vistas on the way up and they keep getting better and better as you increase in altitude. There are a lot of switchbacks as the trail climbs approximately 1,100 feet, so it will have you breathing hard. I recommend a walking stick to help with the climb and to keep your balance, especially in the rocky areas. At the top, you are afforded absolutely tremendous views of the area and down into Mexico. Many hikers relax and hang out at the summit since it is so beautiful.
I highly recommend this hike.