Greenland Mines is trading 18.58% higher at $6.13, with no verified company-specific catalyst identified. - No verified October 12 company-specific announcement or clear catalyst explaining the gain was found. - Latest listed releases were an October 9 invitation to an Arctic mining roundtable and an October 6 share repurchase authorization; neither is established as the cause. - Broader-market readings were mixed and modest and do not clearly explain the sharp rise; volume or other activity data was not provided.