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It is difficult to say since the market trends are changing so the mining companies must analyze their TO and IT costs very well for the correct operation and that their affiliates earn at least 30% on their investments ... .
Now you must be careful with the mining scam to check very well their operative capacity, etc., the dates of operation they ask for and others.
I have a post about which I include my opinion about it and a few pages of mining that have already time ...