Borr Zone
Scaled Cross-Section through the Thor area showing the relationship of the Borr Zone to the existing Thor epithermal Mineral Resource (click on image to enlarge)
The Borr Zone was discovered in the summer of 2025 in drill hole Thor-256. The zone is not exposed at surface, and it is found along the main access road to Thor on the flanks of a steep hill side. Apart from this drill hole intersecting the Borr Zone, Thor-257 and Thor-259 intersected the zone.
In drill core, the zone resembles the main Thor deposit and is characterized by the presence of sphalerite, pyrite and tetrahedrite. Alteration is primarily quartz-carbonate, and sericitization.
The significance of this zone is its location for two primary reasons:
The Borr zone will be come a major exploration target moving forward with drilling at Thor.
In drill core, the zone resembles the main Thor deposit and is characterized by the presence of sphalerite, pyrite and tetrahedrite. Alteration is primarily quartz-carbonate, and sericitization.
The significance of this zone is its location for two primary reasons:
The Borr zone will be come a major exploration target moving forward with drilling at Thor.
Virtually all of the historic silver deposits in the Silver Cup Mining District are spatially related to the Silver Cup Anticline. The Borr Zone appears to connect the Thor epithermal deposit to the Silver Cup Anticline. The Thor epithermal deposit is currently rootless, and it does not have a continuation down-dip of the lamprophyre dyke and related alteration zone. The Borr Zone would appear to be the connection to the Silver Cup Anticline which plunges under initial discovery holes in the Borr Zone.
In 2023, a large volume of high‑grade float was discovered in the Horton Area. Its position made it impossible for the material to have originated from the known Thor deposit. Over three years of follow‑up work has shown that this float is derived from the mountainside immediately west of Thor—an area now referred to as Nortran, named after a suite of 1980s airborne EM anomalies that were never investigated. Taranis has since completed extensive additional EM surveys here, including VLF, EM‑37, and airborne MT.
The Nortran area hosts a dense cluster of electromagnetic anomalies, most likely caused by carbonaceous sediments that do not outcrop at surface. Unlike the linear EM responses associated with fault zones at Thor, these anomalies form irregular patterns consistent with carbonaceous alteration halos surrounding epithermal veins.r own text and edit me.
The Borr Zone has been modeled using the exiting drill intercepts and also some of the EM anomalies from the MT survey. These show two major clusters of anomalies that extend down towards the Silver Cup Anticline that lies under the Thor Property.
These are referred to as the North and South Conductive bands, and both of them extend upwards towards the Thor epithermal deposit. They are broken just below the Thor epithermal deposit by the lamprophyre dyke and its associated alteration zone, that has intruded and disrupted the epithermal vein system.
These are referred to as the North and South Conductive bands, and both of them extend upwards towards the Thor epithermal deposit. They are broken just below the Thor epithermal deposit by the lamprophyre dyke and its associated alteration zone, that has intruded and disrupted the epithermal vein system.
Epithermal mineralization in Thor-256. Host rock is heavily- altered sediments and quartz-carbonate. The salmon colored mineral is sphalerite (click on image to enlarge)
Diamond drill at Thor on drill hole Thor-256. View looking south towards Trout Lake.
Tetrahedrite (metallic) and sphalerite (salmon color) in quartz-carbonate vein in drill hole Thor-256 (click on image to enlarge)