Ground geophysics extends gold-bearing fault zone, finds new structure for Redstar
A ground geophysical program on Redstar Gold’s Unga Gold Project in Alaska has extended the gold-bearing Shumagin fault to the southwest and identified a second parallel structure.
The IP and magnetic surveys, designed to locate the buried extension of the Shumagin fault in preparation for step-out drilling, succeeded in tracing the known portion of the fault, identifying the fault’s geophysical “fingerprint” for an additional 600 metres southwest from existing drill holes, and discovering a parallel structure in the footwall north of the Shumagin gold zone.
Previous mapping, sampling and drilling along the fault defined a near continuous zone of gold-bearing quartz-adularia-carbonate breccias, veins and stockwork along 950 metres of strike and to depths of approximately 330 metres. Mapping and sampling to the southwest indicates expansion potential for an additional three kilometres along strike towards Orange Mountain, the interpreted hydrothermal centre along the Shumagin Trend, a major structure responsible for the localization of epithermal mineralization in the region.
Redstar processed the IP and MAG survey data using Geosoft Oasis montaj and created unconstrained 3D inversion models in Geosoft VOXI Earth Modelling. The company processed the IP and resistivity data in the IP Extension for montaj to generate pseudo sections and stacked section plots and to create plan maps of gridded and contoured data. The processed and corrected magnetic data (total field measurements) was gridded and brought into the MagMap extension for reduction to the magnetic pole, and plots were created using the histogram equalization colouring method.
Redstar will begin drilling the geophysical anomalies in May 2017 to try to trace the quartz-adularia-carbonate breccias along strike of the Shumagin fault at 100 metre centres. Detailed prospecting and soil sampling grids will cover the area of basalt and andesite around the new footwall structure 400 metres north of the fault in order to locate geochemical anomalies that can be drill tested later this summer.
Read the full news release on Redstar’s website.