Bluemining.net is hashmining.eu
Head over to https://www.bluemining.net/terms-conditions/
Read down to:
1. INFORMATION ABOUT US
1.1 We operate the site, Bluemining.net. To contact us, please see our support, info@bluemining.net.
So click on "info@bluemining.net" and guess what?
It generates an email to info@hashmining.eu