Invocation of compulsory joinder. Issues submitted to two separate arbitration proceedings. Request for adjudication on the merits by the judiciary in view of the allegation of the need for a single and joint decision for both proceedings. Non-configuration of compulsory joinder. Controversies without a relationship of dependency, "and, even if the appellant herein should be unsuccessful in both proceedings, the mining rights may be converted into damages" and uniform judgment not being required: