The following is a link to the system that the Frontier uses when players wish to create mines. https://docs.google.com/document/d/1q5hqbFQmaA_DlSGVt_gw-3mVumgAgt006BoLMowuc38/edit?usp=sharing
If you have any questions, please feel free to comment and ask, and it will be added to the FAQ.