The ATLAS -1 occurrence is a distinctly stratiform Zn-Ag-Cu type of VMS deposit, similar to the deposits in the Hackett River and Sturgeon Lake districts. It has an extensive and well defined footwall alteration zone, and is capped by a laterally extensive exhalite, consisting of banded iron formation and chert. Drilling also encountered very localized zones of unusually high Au and Ag mineralization, which tentatively may represent a second type of mineralization, superimposed on the VMS system.
A plan view map (Figure 1 below) indicates drillhole collar locations (green dots) along with a tabulation of all mineralized intersections (Table 1). Hole MRC-12-12 was drilled approximately 2 km to the south west and was designed to test the intersection of two electromagnetic geophysical features. While this hole did not encounter the massive sulphide occurrence, it did encounter the Iron Formation marker horizon, and anomalous metal content and alteration. The Iron Formation marker horizon was also encountered in hole MRC-12-07, as well as all other holes which were drilled into the ATLAS-1 occurrence (see Figure #2 for a stylized schematic vertical section of drilling centered on line 2450)
Figure 1: Drillhole Locations (Plan view) for summer 2012 drilling program at ATLAS-1
In the image above, the black lines indicate “in phase” electromagnetic conductors, and the green lines represent slightly weaker electromagnetic conductors (quadrature response). This image represents approximately 3 km of a conductive geophysical feature, which has a strike length of approximately 7.2 km.
Figure 2: Stylized vertical section of the ATLAS-1 occurrence through line 2450E
The presence of ATLAS-1, and the ZAC occurrence approximately 20km to the NE with numerous geophysical conductors identified during the August 2011 airborne magnetic and electromagnetic surveys suggest the presence of additional VMS systems in the greenstone belt on Anconia’s claim group.