As you will have noticed, the tech mine update is taking longer than I expected. Sorry to all those holding out for it! This is partly due to a lack of time (work, family commitments) and partly due to my ambition on new features. Momentum is picking up again and I now expect the release to be late February.
In the meantime, there will be an update in the next few days which adds 4 new missions to the expeditions, along with the usual collection of minor bug fixes etc.
Thanks for your patience!