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No, I can't find a tag related to mining. But maybe it's a good thing if there is not a computing way to mine coins. Compared with Bitcoin mining, the posts on Steemit are more about "normal" people and everyday life. If one day Steemit surpassed Bitcoin, this may be the biggest reason.

Actually, it is possible to mine steem.
Here is a link:
https://steem.io/documentation/how-to-mine/