The mine ride has always been planned to open in the first quarter of 2014, so 7 months ahead would put it opening in September. Looking at the current progress I have my doubts about that.
Agree. It's also a relatively new type of ride system for Disney: combo coaster / dark ride with swinging vehicles. The test & adjust phase will take longer than is often the case with more tried-and-true systems.
Once physical construction is complete, it could be weeks or months before the attraction is ready for 16-hour operational days.