Here it is re-oriented as a 6.5 X 12.5 instead of 10X10. If you have an additional 16" on each side you then will have all around easy access and reach to the entire layout.
And being able to get all around the layout gives you great views from many directions, which adds much interest to watching the trains run.
Below is the layout plan with the mine loop and a tunnel removed for clarity. On the left side are two turnouts, one to the yard, and the other is a crossover to the inside loop-to-loop. This adds operating variety as NEC suggested, and also is a convenient reverse loop from the yard, for turning an engine or train to get it ready for the next run. (No need for a turntable - no room for it either.)