I had been to Goldfield Ghost Town once before I had my child, and then recently went with my almost 2 year old and a niece and nephew a little older and younger than her. If the weather is nice, it is a fun place to explore for a few hours, but don't expect a full day of it. The kids enjoyed the train ride the most, as well as the reptile house. The "fun house" was fun for the adults, but terrifying for such young children. I would think that kids ages 4-10 would like this much better than the little tiny ones. It was a little hard to maneuver the stroller around on the dirt road, but do-able. Definitely something to consider, especially with elementary age children!
Everything here costs, and everything is expensive, but it is still fun. We took my kids (6, 3, and 1.5 yrs) here for a day trip one Saturday. I was surprised by how busy it was. The littest 2 of my kids were free for everything so that kept our costs down a little. And there is a pass for the 3 main attractions which saves you a lot of money too. We started with the mine tour. Our tour guide was really silly. They do turn off the lights for a minute, but my kids were fine with it. The tour is more for entertainment than educational purposes but we all enjoyed it. The next thing we did was the mystery shack. It was a really short tour. The kids though it was cool, but it is basically a couple tricks based on optical illusion since you are in a very slanted room. Before going on the train ride we watched the free gun show. The "actors" are volunteers and weren't that great, but the kids liked the show because it was a lot of really loud shooting. The train ride is pretty slow and takes you around the outside of the tiny town. There are some good picture opportunities, and if you can hear the train driver (which I couldn't over my kids), he gives you some history of the town. Bandits on horses "attack" the train. My kids liked seeing the cowboys riding horses. We didn't do the other little museums (more $) or restaurants but there are a few more. We walked around a little bit, though, not that there is a lot to walk around. There is a tiny cemetery and some old mining machinery. I would suggest stopping by here sometime, but once is enough. Also, be aware that you need to bring CASH (there is an ATM at the train station) and that everyone asks for tips (but we didn't give them any).
A good place to go to feel like you've 'gone on vacation' without leaving the Valley. The train ride is a sure winner for your little ones, as our 3 year old *loves* it. The mine tour was a stretch for us- she tired of the walking & wasn't into listening to the historical story behind the mines, so that was unfortunate for the rest of the group but she did like the creaky elevator ride and lighting within the tour. Try to stay till sunset- the views are gorgeous and there are great photo ops all around you.