"The monsters are going green! To preserve the natural beauty of their world, the monsters have decided to replace the existing mine structure with a smaller on that is friendlier to the environment. Even though it produces diamonds a little less often than its predecessor, the monsters are proud of their decision and always recall that good things come to those who wait."
The mini-mine is a Structure that provides 1 Diamond 
every twenty-four hours. This is a much slower rate than the regular Mine, but it can be purchased with coins File:Coin20px.png instead of diamonds. Only one mini-mine may be built on an island, but each island can have its own mini-mine. The mini-mine was introduced with the update to version 1.1.3 and permanently replaced the regular mine on 1 March 2013.
The mini-mine used to start with 1 diamond after purchase, but no longer does that.
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