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Overview

The Haldane property is an under-explored high-grade silver property in a historic silver mining region in Yukon Territory known as the Keno Hill Silver District. The 8,164 ha property hosts structurally-controlled silver veins within the traditional territory of the First Nation of Na-Cho Nyak Dun (“FNNND’). The Keno Hill silver deposits have produced over 200 million ounces of silver in a long history of mining from 1913 to 1989, with production recommencing briefly from 2011-2013 and again in 2021-2022. The Haldane property is well situated approximately 25 km west of the main Keno Hill deposits. Mineralization is controlled by northerly trending structures and consists of galena, sphalerite and tetrahedrite-tennantite in quartz-siderite gangue.

Silver North has made two recent discoveries at Mt Haldane, including the West Fault Zone, where drilling intersected 5.24 metres averaging 1,351 g/t silver, 2.43% lead and 2.91% zinc (estimated true width of 3.14 metres). This new zone was a blind discovery and has now been traced over a 100 metre by 90 metre area with room to expand along strike and to depth. In all, approximately 12 kilometres cumulative vein exploration potential exists at the Haldane Project, with only 28 drill holes completed from surface to date, testing less than 600 metres of that potential. It should be noted that the best mineralization found to date occurs where the mineralized structures cut the Keno Hill quartzite unit – a very similar geological setting for mineralization as at the main Keno Hill deposits mined for over 100 years.

The Keno Hill District

The Keno Hill District is located in a mining friendly jurisdiction and ranks as one of the highest grade silver districts in the world. The Yukon government Minfile (2003) production statistics for the period of 1913-1989 indicate that 4.87 million tonnes were mined at an average grade of 1,389 grams/tonne (g/t) silver, 5.62% lead and 3.14% zinc. Over 65 deposits and prospects have been identified in the district. Most occur within the Keno Hill quartzite as structurally-controlled veins in proximity to the Robert Service Thrust Fault.

Hecla Mining Company is the biggest player in the district, and as of Q4 2023, was ramping up production at its 400 tonne per day mill. Five deposits are present at Keno Hill – Bellekeno, Flame and Moth, Lucky Queen, Bermingham and Onek. Hecla commenced production at Keno Hill in mid 2023 with Proven and Probable Reserves of 1,993 tonnes grading 700 g/t silver (totalling 49,473,000 ounces silver) with an additional 32,288,000 ounces silver in Measured and Indicated Resources according to Hecla’s website (January 2024).

The Haldane Property

The Haldane property is named after Mt. Haldane, on the mountain on which the property is centred. Earliest documented work dates to 1918, but prospector Andy Johnson is credited with the first lead-silver discovery here in 1896 and staked the first claims on the mountain in 1905. This early work focused on the Mt. Haldane Vein System (MHVS) an area encompassing two areas of mining on either side of Bighorn Creek. At the Middlecoff Zone on the south side of Bighorn Creek, mineralized veins were traced over 600 m on surface and the underground development produced 24.7 tonnes of hand-sorted ore that graded at 3,102 g/t Ag and 59% Pb. At the same time, work was taking place on the Johnson Vein on the north side of Bighorn Creek, including a short adit. Eventually, in 1926 and 1927 these workings produced a total of 2.1 tonnes at 4,602 g/t Ag and 57.9% Pb, also of hand-sorted ore. This mineralization is hosted in north-trending veins within the Keno Hill quartzite. Glaciation during the last glacial period was confined to the valleys, meaning that much of the Mt Haldane area has not been glaciated at higher elevations and because of this, ground is heavily weathered and broken, with oxidation extending as deep as 150 metres and little fresh sulphide mineralization exposed on surface.

Recent Exploration

Upon acquisition of the property in 2018, Silver North conducted a systematic evaluation of the entire property, including the MHVS area. This work highlighted numerous target areas outboard of the MHVS as well as targets proximal to the areas the early prospectors worked within the MHVS.

Currently, Silver North is currently focused on three areas, the West Fault and Middlecoff Zones (within the MHVS) and the Bighorn target located 3 km northwest of the MHVS. In addition, many early stage targets exist that have yet to receive systematic follow up to advance them to the drilling stage.

The West Fault Target

The West Fault discovery in 2020 consisted of the intersection of a wide zone of silver mineralization averaging 311 g/t silver over 8.72 metres in hole HLD20-19. This drilling targeted the downdip and on-strike extension of 320 g/t silver over 1.2 metres from drilling in 2011 by a previous operator. This hole was never followed up prior to the 2020 program and was originally collared to test mineralization on the Main Fault, a parallel fault hosting two silver-lead occurrences on surface. The previous operator intersected the (unrecognized at the time) West Fault mineralization at a shallow depth in the 2011 hole within the heavily weathered portion of the vein. Silver North’s 2020 hole targeted a deeper intersection of this mineralization where it was more likely to contain fresh sulphide mineralization. The wide intersection of +300 g/t silver mineralization exemplified the potential of the Haldane Project to host silver vein deposits of the size and grade seen elsewhere in the Keno Hill District. Follow up drilling continued to intersect mineralization in excess of 300 g/t silver over multi-metre widths and has now been identified the West Fault structure and associated mineralization over 100 metres of strike length and 90 metres of down dip extent.

Further exploration at the West Fault will target this mineralization along strike and down dip to the southwest, along 50 metre step outs.

 

Table 1: Significant Drill Intercepts – West Fault Target

HoleFrom (m)To (m)Core Length (m)Est. True Width (m)(1)Silver (g/t)Gold (g/t)Lead (%)Zn (%)AgEq (g/t)(2)
HLD20-18225.95232.756.83.73960.150.150.73140
          
HLD20-19225.5226.00.50.282260.024.6125.91347
and246.8263.016.28.723110.110.891.13390
including252260.38.34.484440.151.541.34554
including257260.33.31.788180.23.471.03980
HLD21-23211.1211.40.3(3)0.181450.530.319.3925.6
HLD21-24265.9271.15.2(3)3.1413510.082.432.911542
Including269271.12.11.2632670.115.87.023720
HLD21-25293.4300.36.94.27363.40.141.732.8534.2
Including295.8297.41.61.011070.166.983.971485

(1)True width of the vein and breccia mineralization is estimated to be 50-70% of the core length intersection. A value of 60% is used for the purposes of reporting.

(2) Silver-equivalent values are calculated assuming 100% recovery using the formula: ((20 * silver (g/t) / 31.1035) + (1650 * gold (g/t) / 31.1035) + (0.90 * 2204 * lead %/100) + (1.10 * 2204 * zinc %/100)) *(31.1035 / 20). Metal price assumptions are US$20/oz silver, US$1650/oz gold, US$0.90/lb lead and US$1.10/lb zinc.

(3) Core recovery is estimated at 70-75% for HLD21-24 and 25, with the exception of a 0.80 metre section of HLD21-24 where recovery was zero. A value of zero was assigned to silver, gold, lead and zinc for the section of zero core recovery for the purposes of composite interval calculations. Core recovery is estimated at 46% for HLD21-23.

 

Bighorn Target

The Bighorn Target was explored in 2019, with a mapping and soil geochemical sampling program expanding the Bighorn soil geochemical anomaly at least 900 m in length and almost 150 m in width. Multiple structures anomalous in lead and silver were identified in mapping and trenching, and high lead and silver values were returned from soil sampling (including a high of 63 g/t silver and >1% lead). This work was confirmed by drilling which consisted of one hole that tested the width of the anomaly, intersecting at least four structures including a 9m-wide (core length) fault that hosted a 2.35 metre section averaging 125.7 g/t Ag and 4.4% Pb. This hole confirms the Bighorn Zone as a second target area 2.8 km from the Mt Haldane Vein System.

 

Vein-Structure Intersections HLD19-15 (Bighorn Zone)

Drill HoleFrom (m)To (m)Core Interval (m)Ag (g/t)Au (g/t)Pb (%)Zn (%)Core Recovery (%)
         
HLD19-15151.7158.36.650.10.0041.850.1485
includes154.15156.52.35125.70.0044.390.0984
HLD19-154853.655.652.10.0030.150.0169
HLD19-15133.3135.52.25.60.0130.660.0597
HLD19-15196.951981.0548.20.0042.082.7345
HLD19-15251253.62.63.20.0070.071.0186
HLD19-15271271.40.442.70.0052.161.0791
HLD19-15328.65329.40.7520.0030.061.03100

 

Middlecoff Target

The Middlecoff Target sits on the southwest side of Big Horn Creek and was the focus of much of the earliest work at Haldane. Underground development started at Middlecoff in 1919-20 produced  24.7 t at 3102 g/t Ag. Historic work includes 207m drifting and a 56 m raise/shaft in 1919, plus an additional 91 m of underground development and 518 m of underground drilling (horizontal) in 1966. Exploration at Middlecoff has been frustrated by the presence of the Ewing Fault which is oriented obliquely to the Middlecoff vein structure and appears to cut off mineralization up dip.

Recent exploration has targeted the Middlecoff Zone and combined with historical work, has identified 235 m of mineralized strike length on the structure, with evidence that it may be open to the north (presence of a prospecting shaft) and to the south, based on historical high grade silver results from underground drilling to the south of the workings. A 1960’s era drillhole, UM02, yielded 2,791 g/t silver over 1.2 metres approximately 40 metres to the south. This hole has never been followed up and future exploration at the Middlecoff Target will investigate the potential of this target to the south along strike and at depth.

 

 Vein-Structure Intersections – Middlecoff Zone

DrillHoleFrom (m)To (m)Core Interval (m)Ag (g/t)Au (g/t)Pb (%)Zn (%)Target% Core Recovery
HLD11-11126.05130.154.1036.70.0280.9436.107Middlecoff92
includes129.15130.151.101230.0873.0720.3Middlecoff??
HLD19-16110.3112.762.46211.10.4585.453.37Middlecoff77
includes111.35111.70.359961.48628.350.5367
HLD19-16114.3412510.66125.60.0741.270.47Middlecoff89
includes114.34117.73.36155.80.2083.640.9996
and121.551253.45205.70.0140.170.2491
includes121.55122.571.024550.0150.390.5182
HLD19-16133133.350.351870.0080.240.29Footwall73
HLD19-16154.25156.42.1542.70.0550.151.24Footwall86
HLD19-171251294.0058.30.1321.290.28Middlecoff98
HLD19-17130.9133.152.259.40.0150.060.72Middlecoff92
HLD19-17155.61604.4056.20.1480.380.36Footwall84
includes1591601.001800.1290.940.5089

 

Other Targets

The Johnson Vein and Main Zone targets remain high priority targets within the MHVS area. Approximately 340 m of underground development was completed in the Johnson adits with 2.1 tonnes of 4,600 g/t silver extracted in 1926. Limited modern work has been done at the Johnson Target, where a complex structural setting has made exploration of this high grade mineralization challenging, however, future programs including geophysical surveys may be undertaken to aid in targeting drilling.

The Main Zone appears to be a parallel structure to the West Fault, perhaps offset 100-150 metres to the southeast. Unlike the West Fault which does not have mineralized silver showings on surface, the Main Zone has two areas of silver mineralization exposed on surface. The Main Zone showing consists of a 7.6 m chip sample which averages 151 g/t Ag, 0.6% Pb, and 1.6% Zn, while the Main Zone South yielded a 3.6 m chip sample returning 223 g/t Ag, 0.6%Pb, and 1.17% Zn.  Both of these results are considered to be extremely significant, indicating the potential for high grade silver mineralization at depth, below the zone of weathering where sulphides are destroyed and grades muted. Drilling to date has not tested the Main Zone below the level of weathering. With almost 1.5 km of strike length potential, the Main Zone remains a high priority target.

Other targets such as the Peak Vein and Strebchuk Showing remain underexplored and are not yet at a stage to be tested by drilling.

 

Mt. Haldane Property, Significant Historic Results

LocationTypeWidth (m)Ag (g/t)Pb (%)Zn (%)
Middlecoff Zone
upper aditchip0.61335315.8 
middle aditchip1.624668.1 
middle aditcore1.2279118.7 
middle aditcore0.93437.1 
lower aditchipave. 0.8293920.00.75
lower aditchipave. 0.9877518.01.2
Johnson Zone
 chip1.524735.51.5
 grabn.a.537539.7 
Main Zone
 chip7.61510.61.6
 chip1.17825.31.4
Sundown Showing
 Chip1.44020.120.14
Mt. Haldane, Peak Vein
 chip0.3862063.5 
 chip0.51527913.1 
 chip0.81188510.8 
North Star cirque, Strebchuk Showing
 selectn.a.160270.2 

Maps

Photos