Sound is interesting to me. I just met with new categories of Bitcoin names. Why are you exactly looking for Bitcoin from miners? Bitcoin can easily be exchanged with someone P2P, and you can buy fresh coins from a centralised exchange. But you seem to be looking for so-called virgins; definitely there is something wrong. I don't feel forum users will engage with you to exchange your dirty coins. Because they might fall into trouble later.

What do you mean by premium? Do you want to pay much more extra to exchange your Bitcoin? And which jurisdiction are you in? Miners won't take the risk for dirty coins because they are well-known. When they receive or are involved with mixed coins, they will definitely have to encounter legal issues.