A simple mod that allows ore to refresh over time, it will refresh X amount every X ticks. These options can be configured in the options.

There is also a (possibly broken) config option to prevent the script from replacing the ore if it gets completely exhausted.
This addition allows a static home base without having to constantly move stuff or have an ever expanding train network to keep up with resource requirements. Instead you only need to expand so the ore can keep up with the demand.