HIGHLIGHTS:
- First ever high-resolution model of Induced Polarization (“IP”) geophysical data completed, revealing multiple large-scale, near-surface anomalies matching known responses of historically mined sulfide mineralization
Rockford Target displays similar lithologic setting to the historical March stope, the single largest producing region of theBunker Hill Mine , and is located 250’ south of the existing mine footprint- Government Gulch (“GG”) Target includes several zones, with the largest having a similar scale and orientation to the Quill-Newgard zone, the largest ever continuously mineralized zone identified at the mine
- Shallow nature of target areas (<400 ft depth) allows for low-cost surface drilling from existing roadways
- Significant potential to increase mineralized resource above the water table through further exploration
The geophysical program, which ended in September of 2021, has now been run through multiple inversion modeling processes to create a high-resolution 3D block model. Previously identified lithologic and structural features are well represented in the data and have allowed for Bunker Hill geologists to further refine geologic models over the program area previously generated from historic mapping programs.
Two key targets have been identified for further exploration: the Rockford Target and Government Gulch Target.
Figure 1: IP Anomalies in Plan-View of Bunker Hill Mine Package, is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/eca3f609-759d-45e5-82e1-71d14077a393
Figure 2: Geologic Map of IP Anomalies, is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/40e30d02-34a9-4197-b01c-3c627bb62739
Mineralization at the
The
The Rockford target is hosted at the intersection of the Rockford and Midland faults. Host lithology is the Revett quartzite, here identified by its relatively low IP and high resistivity values. Disseminated pyrite, a dominant feature of the Zn-Pb-Ag mineralization shows an elevated IP response, with a decrease in resistivity. Normal fault wedge-hosted mineralization is known to have existed in multiple locations throughout historic development at Bunker, specifically the March stope which was the single largest producing region of the Bunker Hill mine recording ~4.7Mt of material at 12.03% Pb, 5.22 OPT Ag, and 2.25% Zn. Top of the target zone lies only 150’ from surface, 250’ from the historical mine footprint and is located adjacent to an existing roadway with excellent access for future drill testing.
Figure 3: 2D section looking SE at the Rockford target zone. Resistivity anomalies shown in magenta blocks, is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/9080fab3-8fe3-4868-bdac-2538e845cdbc
A historic down-hole IP geophysical survey on the 21-level of Bunker Hill shows the IP/resistivity characteristics of both massive and finely disseminated sulfide mineralization within Revett rocks to match those of the Rockford target zone.
The Government Gulch (“GG”) Target
The Government Gulch fault brings the deeper Belt series rocks into contact with the Revett quartzites. The GG target zones lie approximately 900’ in the hanging wall of the Government Gulch fault structure and both strike NW with an approximately vertical, slightly NE dip. The tabular nature of the targets shows well defined, along-strike truncation of the combined high IP response with very low resistivity values, separating the target zone from other similar response characteristics of the Prichard thought to identify stratigraphically constrained beds with elevated pyrite content. The larger of the zones measures approximately 1000’ along strike, 250’ wide and 700’ down dip, placing it on the same scale as the largest-ever identified, continuously mineralized zone at Bunker Hill, the Quill-Newgard.
Figure 4: 2D section looking SE at the Government Gulch target zone. Resistivity shells are sliced along the 2D fence plane to show correlation and shown in blue blocks, is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/1d83d89f-f92b-4472-ab4c-844f2ecf2e9e
The top of the GG target zone lies less than 400’ surface and directly adjacent to the already established road network used for the mobilization of the geophysical program. Bunker Hill is currently developing options to mobilize an exploration program to advance and delineate both the Rockford and GG target zones.
QUALIFIED PERSON
Mr.
The Qualified Person has verified the information disclosed herein, including the sampling, preparation, security and analytical procedures underlying such information, and is not aware of any significant risks and uncertainties that could be expected to affect the reliability or confidence in the information discussed herein.
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Figure 1
![](https://ml.globenewswire.com/media/eca3f609-759d-45e5-82e1-71d14077a393/medium/figure-1.png)
IP Anomalies in Plan-View of Bunker Hill Mine Package
Figure 2
![](https://ml.globenewswire.com/media/40e30d02-34a9-4197-b01c-3c627bb62739/medium/figure-2.png)
Geologic Map of IP Anomalies
Figure 3
![](https://ml.globenewswire.com/media/9080fab3-8fe3-4868-bdac-2538e845cdbc/medium/figure-3.png)
2D section looking SE at the Rockford target zone. Resistivity anomalies shown in magenta blocks
Figure 4
![](https://ml.globenewswire.com/media/1d83d89f-f92b-4472-ab4c-844f2ecf2e9e/medium/figure-4.png)
2D section looking SE at the Government Gulch target zone. Resistivity shells are sliced along the 2D fence plane to show correlation and shown in blue blocks
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