1. As the fluids reached the incipient normal fault, they traveled along it Brecciating the footwall to form the hydrothermal breccia sill

2. Rapid cooling is attributed to post-20 Ma uplift of mylonitic gneisses in the footwall of an evolving low-angle detachment fault system of extensional origin.

3. Analysis of seismic data in conjunction with aeromagnetic anomalies and regional gravity data also reveals a continuous section of basalt in the footwall of the Keweenaw fault.

4. GZK1 is located on the upper part of the stope near the footwall of the orebody, and the test results show that the Backfill quality of this part is poor; thus, a complete Backfill …