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Bunker Hill Discovers High-Grade Silver Mineralization

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Bunker Hill Discovers High-Grade Silver Mineralization







  • New high-grade silver and lead vein system discovered during development of an underground ramp connecting Levels 5 and 6 in the upper part of the mine
  • Structure remains open along both strike and dip forming an attractive silver exploration target
  • Highlights Include: 1.3 Ft @ 10.87 t Oz/t Ag, 33.05% Pb (Including 0.6 Ft 23.45 t Oz/t Ag, 71.43% Pb) & 3.4 Ft @ 4.52 t Oz/t Ag, 14.02% Pb (Including 0.4 Ft 26.25 t Oz/t Ag, 82.17% Pb)


Bunker Hill Mining Corp. (CSE: BNKR) (OTCQB: BHLL) is pleased to announce that it has discovered a previously unknown high-grade silver-lead vein system as part of its on-going underground mine development activities.


Sam Ash, CEO stated: “Encountering this new vein through our current development in the upper part of the mine highlights the potential to add additional high-value tons to our existing mineral resources. Although extensively developed, much of the mine was not explored in a modern sense implying potentially significant upside to be discovered. Silver-lead vein style mineralization was the primary source of Bunker Hill’s early production, and we look forward to continuing to explore this emerging new target concurrent with the restart of operations.”


A photo accompanying this announcement is available at


Located between two major fault structures, the vein is considered to be analogous to historically mined, low-angle extension structures which formed part of the “J” vein stopes. The “J” stopes historically produced over 1.1Mt with an average grade of 7.59 OPT Ag, 9.88% Pb and 0.59% Zn – therefore this newly discovered vein forms an attractive high-grade silver-lead target. The vein was intersected approximately 600 feet into the 1,600-foot planned decline ramp connecting the existing 5-level and 6-levels of the mine. Bunker Hill geologists have now completed a channel sampling program on the accessible portions of the structure (Table 1).


Mineralization from the channel sampled vein portion continues as a high-angle vein structure associated with the Sullivan fault to the east, providing an additional high priority exploration target, as historic stoping areas associated with high-angle vein mineralization on average showed substantially wider structural widths. Vein mineralization associated with the Sullivan fault formed the footwall mineralization to the historic March stopes which produced a total of 4.7Mt at an average grade of 5.22 OPT Ag, 12.03% Pb and 2.25% Zn. Stockwork vein mineralization extending from the extension structure to the west is seen to truncate into the foot wall of the Cate fault, but with a lack of historical development and drilling west of the Cate (hanging wall) the possibility to discover previously un-developed hybrid Silver-Lead-Zinc style mineralization remains open along both strike and dip.


The proximity of the structure to existing 5-level workings provides a readily available drill platform from which to further explore the extent of the vein. The Company plans to follow up with drill targeting of both the extension vein and high-angle target zones upon further advancement of drift development.


Table 1: Channel Sample Assay Results from Decline Vein Exposure

(All channels oriented vertical, see Figure 2 for collar locations. Reported widths are sampled widths and do not reflect true widths as there is currently insufficient data to calculate true orientation in space)


Channel ID Width (Ft) Ag (g/t) Ag (OPT) Pb (%) Zn (%)
r01_105s 2.8 60 1.74 4.65 0.31
r01_110s 2.5 41 1.18 3.89 0.27
r01_117s 1.3 373 10.87 33.05 0.07
Inc. 0.6 804 23.45 71.43 0.11
r01_124s 0.7 714 20.83 67.26 0.14
r01_130s 0.7 302 8.81 27.73 0.11
Inc. 0.3 673 19.63 61.70 0.20
r01_141s 3.4 155 4.52 14.02 0.10
Inc. 0.4 900 26.25 82.17 0.06
r01_150s 1.5 126 3.68 9.84 1.18
r01_160s 0.9 100 2.91 9.80 0.20
r01_111n 0.9 351 10.24 38.99 0.22
r01_120n 1.9 81 2.37 8.08 0.11
r01_130n 0.9 114 3.32 9.17 0.61
Inc. 0.4 247 7.20 19.95 1.29
r01_140n 2.2 109 3.17 8.63 0.13
Inc. 0.3 505 14.73 39.36 0.07
r01_150n 1.2 78 2.28 6.90 1.02
r01_160n 0.8 376 10.96 29.69 0.17
Inc. 0.3 895 26.10 74.73 0.17
r01_172n 1.4 36 1.05 2.76 1.27
r01_170s 0.3 67 1.95 4.03 2.68
r01_180s 0.3 127 3.70 11.30 4.19


Channel samples were analyzed by ALS USA Inc utilizing an ore-grade, 4-acid digestion (OG62) with titrations (Pb-VOL70) for lead overlimit analysis.


Bunker Hill geologists conducted a channel-chip sampling program along the length of the vein exposure on approximate 10’ intervals for a total of 17 samples between both the north and south rib. Samples were taken vertically while respecting mineralogical and structural boundaries of the overall structure width and internal high-grade core mineralization. The results from this sampling program will be used to guide future exploration efforts with the goal of bringing the mineralized material into Bunker Hill’s mineral resource.


A photo accompanying this announcement is available at


Vein mineralization includes a high-grade core zone containing massive, coarse to fine grained galena as the dominant silver and lead mineral with trace amounts of zinc within a broader structural zone, containing similar mineralization disseminated as sulfide pods in a gangue of quartz and siderite stockwork in bleached and sericitized wall rock.


Similar low-angle mineralization in extension structures related to dip-slip movement on the “J” fault is well documented through previous geologic studies and detailed mapping. Stoping on the “J” vein system, located 1,500’ to the east of the newly discovered decline mineralization dominantly on the 19 through 23 levels of the mine, produced 1.1Mt of material averaging 7.59 OPT Ag, 9.88% Pb and 0.59% Zn.


A photo accompanying this announcement is available at


Mineralized silver-lead extension structures similar to the one encountered are repeatedly reported throughout the mine’s historical literature and represent attractive, high value in-mine exploration targets.




Mr. Scott E. Wilson, CPG, President of RDA and a consultant to the Company, is an independent “qualified person” as defined by NI 43-101 and is acting as the qualified person for the Company. He has reviewed and approved the technical information summarized in this news release.


All samples were sealed in shipping pails and sent to ALS USA Inc’s Mineral’s Division in Twin Falls, ID for sample preparation and ALS’s Vancouver location for analytical services. ALS holds ISO/IEC 17025 accreditation. Analytical accuracy is monitored by the analysis of certified reference material, blank material and replicate samples. Bunker Hill inserts independent certified reference material and certified blank material as an independent QAQC protocol in line with standard industry practice. ALS USA Inc is independent of Bunker Hill.


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.




Under new Idaho-based leadership the Bunker Hill Mining Corp, intends to sustainably restart and develop the Bunker Hill Mine as the first step in consolidating a portfolio of North American mining assets with a focus on silver.


Posted August 11, 2022

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