The moose will mine and collect the gems for you. Just make sure they have the best gear possible to do a good job.
Build and upgrade grinders to process the gems and make them ready to be transported for sale.
Expand your operation. Build new railway to allow for collection deeper into the mine. Or hire new miners and upgrade their gear to mine more gems faster. 
This looks valuable
Not unlocked yetMine a black gem
The dark tree rises
Not unlocked yetCut down a black tree
And, yes, Mr. Moose, it does come in black
Not unlocked yetCraft a wand from a black gem and a black stick
Moosecoin investor
Not unlocked yetReach a company value of $ 1 000 000 000
Moosilionaire
Not unlocked yetReach a company value of $ 1 000 000
Moose Wayne
Not unlocked yetReach a company value of $ 1 000 000 000 000
I found a diamond!
Not unlocked yetMine a diamond gem
That's sharp
Not unlocked yetCut down a diamond tree
Timber!
Not unlocked yetCut down a tree
Yer a wizard, Moose
Not unlocked yetCraft a wand
Moose Miner
Not unlocked yetMine 100 000 gems
The moose delved too greedily and too deep
Not unlocked yetMine 10 000 000 gems
Steve would be proud
Not unlocked yetMine 1 000 000 gems
Struck gold
Not unlocked yetMine a gold gem
That's a heavy tree
Not unlocked yetCut down a gold tree
Magic
Not unlocked yetReach first magic gem or tree
Is this it?
Not unlocked yetReach the end of the black magic gem or tree area
Moose Kent
Not unlocked yetUpgrade the carry count of a moose to at least 3672
Moose herd
Not unlocked yetHave a total of 100 moose under your command
Moose army
Not unlocked yetHave a total of 1 000 moose under your command
That's a lot of moose
Not unlocked yetHave a total of 10 000 moose under your command
Saw blade tower
Not unlocked yetUpgrade a moose to at least 3600 saw damage
You spin me right round baby
Not unlocked yetUpgrade a moose to max saw speed
Moose Allen
Not unlocked yetUpgrade a moose to 15 m/s or higher