10/28/2026
What can multiple generations of copper mineralization tell us about a deposit?
At the Creston Copper Zone, copper mineralization has been observed in three distinct phases:
1. Primary porphyry-style mineralization within fragments enclosed by diatreme breccia;
2. Chalcopyrite forming veins and void fillings during the development of the diatreme breccia; and
3. Later veinlets containing chalcopyrite, bornite and disseminated chalcocite that are hosted in both the breccia fragments and the breccia matrix.
Together, these relationships indicate a long-lived and active magmatic-hydrothermal system, with mineralizing fluids active before, during and after the formation of the diatreme breccias.