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 2 months ago 

I have made changes by editing this post because that was a very confusing statement and wrong at well(Written mistakenly)
I apologize for that!

Basically,one idea can be used that we can set up mining rigs for mining any other cryptocurrency like BTC, Ethereum or any other which is working on proof of work mechanism and then that mined token we can replace with STEEM tokens by buying more and more STEEM in place of that mined ones.

Like if we have mined 1 BTC then we can convert it into STEEM tokens by converting them into USDT and then by buying too much STEEM with that.

So in short;

Mining rigs - Crypto mining (Pow mechanism) - Trading - Buying and earning STEEM in this way

Otherwise STEEM works on delegated proof of stake so can't be mined with GPU's(Graphic cards or mining rigs) in a direct way.

Regards; @sahar78