Montanore Minerals Corp. v. Blake

Under Colorado River, district court should have abstained from ruling in a suit to condemn easements and other rights as against the defendants’ mining claims, since a state court had already declined to enter a decree that the mining claims were invalid. The Court of Appeals holds that the district court erred in not abstaining in…

Seneca Ins. Co. v. Strange Land, Inc.

A district court may abstain under the Colorado River doctrine only in extraordinary circumstances, not in an ordinary diversity action seeking damages and rescission under settled principles of state law.  The district court erred in granting a motion for Colorado River abstention in this case which an insurer had filed in federal court seeking rescission…