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Overview

Property Overview

The Keno Silver Project is a highly-prospective, district scale, brownfields exploration property consisting of 112.5 square kilometres in the world-class Keno Hill Silver District of Canada’s Yukon Territory, which has produced over 200 million ounces of high-grade silver over the past 100 years at an average grade exceeding 1,300 grams/tonne. The property is adjacent to, and on-trend with, Alexco Resource Corp’s operations, one of the highest-grade primary silver operations in the world with an estimated life of mine production grade of 843g/t Ag and 68 million ounces of contained silver (Indicated)1. The area features excellent infrastructure, with well-developed and maintained roads, as well as access to the Yukon power grid which supplies Keno City.

Historic ProductionAg oz/tAg g/tAg Eq g/t
Duncan744.325,45526,146
Vanguard305.810,45812,178
Caribou Hill177.16,0578,276
Silver Basin167.85,7397,007

Metallic Minerals land package covers the eastern portion of the district, along with newly acquired portions on the western and southern sides and represents a continuation of the same geological structures and host rock associated with the demonstrated mineralization occurring on Alexco’s ground to the west. The Keno Silver Project was host to seven historic silver mines with some of the highest-grades in the district and four that had average production grades above 5,000g/t (see table above)2. However, the eastern portion of the district has seen little modern exploration due to the longstanding, fragmented, private land ownership structure, which has now been largely consolidated by Metallic Minerals.

Our technical team has reviewed decades of historic and modern geological data in developing priority exploration targets for the 2017 field program which commenced in late May 2017 and is expected to consist of:

  • Continuation of compilation and interpretation of historic exploration data from drilling, trenching, and channel sampling along with existing soil and rock sampling.

  • Refinement and prioritization of targets using additional geophysical and geochemical surveys, stratigraphic mapping, and trenching.

  • Drill testing of highest priority targets to test down-dip and along-strike extensions of previously identified mineralization along the known mineralized trends, including at the historic producing mines on the property, and in areas that show significant potential to host Keno type deposits but that may not have seen historic focus due to soil and vegetation cover.

Keno Hill Silver District Geology and Deposits

Keno Hill type silver deposits consist of high-grade silver veins typically 1-5 metres in width grading from 200 g/t to >5,000 g/t silver, with associated lead and zinc sulphides. The largest individual deposits in the district, which range from 10 million to 100 million ounces of contained silver2, are associated with northeast trending, southeast dipping fault/vein structures which form major ore shoots in the preferred host rocks: quartzite and greenstone. To date, there are twelve known mineralized trends in the Keno Hill silver district, eight of which continue through the eastern portion of the district, which hosts Metallic Minerals’ Keno Silver Project (see Figure 1 below).

Figure 1 – Keno Hill Silver District Geological Trends and Deposits

Figure 1Figure 1

The schematic cross sections shown below (Figure 2,3, and 4) show the geology and deposits from 3 of the 12 known mineralized trends in the Keno Hill silver district, eight of which transverse across Metallic Minerals’ Keno Silver Project. Figure 2 highlights the major historic producers as well as recent discoveries along the Bermingham – Calumet Trend and provides evidence of Keno-type mineralization occurring where the above-noted geological conditions are present. The major, new high-grade Bermingham discovery demonstrates the potential for significant new finds along trend and down dip from past producing mines in this prolific, historic district. More information on these areas is available by clicking here .

Lesser explored parts of the district, particularly the eastern portion of the Metallic Minerals ground, have similar geologic settings and also host historic producing mines and mineralized prospects with the potential to host significant new mineral resources.. Figures 3 and 4 depict the continuity of these key structural trends across the eastern portion of the Keno Hill silver district and identify former operations which represent priority exploration targets. Each of these sections includes a detailed description of the associated target areas.

Bermingham – Calumet Trend (Click to enlarge)

Figure 2Figure 2

Bellekeno – Keno Summit Trend (click to enlarge)

Figure 3Figure 3

Historic production figures described in the cross-sections above are detailed in CATHRO, R. J. (Bob). Great Mining Camps of Canada. The History and Geology of the Keno Hill Silver Camp, Yukon Territory. Geoscience Canada, [S.l.], Sept. 2006. ISSN 1911-4850. Further historic production specifics are available in the Technical Report on the Keno-Lightning Project dated July 31, 2010 and available under the Metallic Minerals’ profile at Sedar.com.

Bellekeno – Keno Summit Mineralized Trend

Figure 3, looking to the northwest, outlines significant historic production from the Bellekeno and Keno Hill deposits hosted in both Keno Hill Quartzite and Triassic Greenstones, respectively. Mineralization continues at surface along this proven productive trend in similar host settings. Past producing mines on Metallic Minerals’ ground includes the Vanguard, Duncan and Caribou mines which had average grades exceeding 5,000 g/t silver2 and are hosted in Keno Hill Quartzite along with the Gold Hill target. The Avenue and Beauvette targets (discussed below on the Homestake Trend) are hosted in greenstones in similar settings to the Keno Hill 12.6 Moz and Sadie Ladue mines 12.7 Moz, which were two of the largest producers in the district. Key target areas along these trends are described in further detail below from west to east, along with results from 2016 surface sampling, where applicable.

Vanguard Target Area

The Vanguard area was first staked in 1920 and saw production exceeding 8,000 g/t silver2 starting in 1934 with 4 shafts excavated until 1949, with no known subsequent modern exploration. Mineralization at Vanguard is hosted in the Keno Hill quartzite and is thought to be associated with secondary cross structure as is commonly seen in the district.

Gold Hill Target Area

The Gold Hill target is defined by an intense vein system referred to as the Porcupine vein, thought to be one of the longest and most continuous vein systems in the district. This mineralized zone continues east from the main Keno Hill deposit, which historically produced 12.6 million ounces of silver. Archival reports of the Porcupine vein from underground workings indicate the vein averaged more than 2,000 g/t silver over more than 2 metres width, with the best grades existing where the vein was hosted by shattered greenstones. Select surface sampling in 2016 at Gold Hill returned 1,921.5 g/t silver, 0.043 g/t gold, 18.14% lead and 2.47% zinc1. These select samples are not necessarily representative of the mineralization on the entire target area but show the presence of Keno style mineralization. The Gold Hill target has potential to host both quartzite and greenstone hosted targets.

Sample no.

Location

Ag g/t

Au g/t

Pb %

Cu %

Zn %

Ag Eq. g/t

1501151

Gold Hill #2

228

0.06

2.47

0.04

1.49

383

1501152

Gold Hill #2

333

0.05

3.47

0.04

1.17

511

1501153

Gold Hill #2

1,921

0.04

18.14

0.11

2.47

2,687

Duncan Target Area

The Duncan area had historic production of 11.8 tons grading 25,462 g/t silver and 22.4% lead2. A highly prospective target at the Duncan area exists where the vein, hosted in quartzite, intersects an overlying schist contact. The schists can act as a fluid cap to the vein and ore shoots are known to occur across the district in this setting. The Duncan target is thought to be a continuation of the Porcupine vein system that hosts the Keno Hill and Gold Hill systems. Selective sampling from surface exposures at the Duncan prospect in 2009 returned silver values ranging from 66.9 g/t to 3,964 g/t, including up to 5.13 g/t gold (see Technical Report on the Keno-Lightning Project dated July 31, 2010 available under the Company’s profile at Sedar.com). These samples may not necessarily be representative of all the mineralization hosted in the entire area but are similar to other areas in the district. The historic Duncan mine was the host of the highest-grade production in the Keno Hill silver district with only very limited exploration since.

Caribou Target Area

The Caribou target area includes the Caribou veins and cross-cutting Alice veins. The showing was first discovered in the early 1920’s and opened up by shafts, an adit, prospect cuts and hand trenches. The vein consists of silver rich galena in a gangue of carbonates, oxides and quartz hosted in the Keno Hill Quartzite. About 120 tons of ore form the Caribou adit was shipped between 1925 and 1927 grading more than 6,000 g/t silver2.

In 2008, six shallow diamond drill holes tested the Caribou and Alice vein systems, following trenching and RAB drilling programs. Follow-up drilling in 2011 targeted strike and depth extensions of the Caribou vein system. Eleven of the fourteen holes drilled at Caribou intersected mineralization, and three of the eleven returned results in excess of 1,000 g/t Ag. Results of the program defined 300 m of continuous silver mineralization at >100 g/t between 11m and 35m down-hole that remains open at depth and along trend. The most significant results are highlighted below:

Hole

From

To

Interval (m)

Ag g/t

Au g/t

Pb %

Zn %

Ag Eq. g/t

CH11-07

15.9

17.2

1.3

770

3.40

893

CH11-08

13.4

14.8

1.4

493

10.50

4.93

875

CH11-09

15.5

16.9

1.4

1,696

0.457

9.40

0.94

2,068

CH11-17

22.9

23.4

0.5

1,787

1.394

18.70

1.29

2,610

CH11-18

24.1

25

0.9

1,151

7.20

1.03

1,451

CH11-18

34.7

36.3

1.6

1,183

12.50

0.08

1,638

In the fall of 2016, select grab samples were collected along the Caribou vein. The results of this sampling program show high grades of silver and elevated gold values occur at surface in this area and additional work will focus on refining potential targets for follow-up drilling. These samples are not necessarily representative of all the mineralization hosted in the area.

Sample no.

Location

Ag g/t

Au g/t

Pb %

Cu %

Zn %

Ag Eq. g/t

1501201

Caribou Vein

6,284

1.07

57.49

0.23

0.71

8,490

1501202

Caribou Vein

5,015

0.53

71.33

0.12

1.33

7,696

1501205

Caribou Vein

604

0.20

6.69

0.03

2.29

950

1501206

Caribou Vein

640

0.16

0.99

0.08

2.22

780

1501207

Caribou Vein

886

0.27

8.12

0.04

0.62

1,226

1501208

Caribou Vein

1,314

0.26

6.83

0.15

0.44

1,612

1501209

Caribou Vein

8,807

1.58

58.51

0.26

0.04

11,063

Homestake – Keno Summit Trend (click to enlarge)

Figure 4Figure 4

Two kilometers southeast and parallel to the Bellekeno-Keno Summit trend, the Homestake trend shows several similar features that are recognized between the two distinct mineralized trends, including the continuation of the Keno Hill Quartzites and Triassic Greenstones known to host mineralization across the district. This mineralized trend is primarily controlled by Metallic Minerals and is defined by several highly-prospective areas, namely the Homestake, Divide, Faith, Segworth and Beauvette mineralized showings. Two prominent target areas in the Homestake trend are discussed below. Three additional parallel trends are identified further east of the Homestake trend as defined by the Cobalt, Gram, Gustavus and McMillan showings.

Homestake Target Area

The Homestake target area represents one of the primary exploration targets on the Keno Silver Project. The Homestake prospective area, originally staked in 1920, is underlain by Keno Hill Quartzite and phyllitic schists of the Earn group, and locally intruded by greenstone sills. Significant grades have been returned from each of the four Homestake veins, known separately as the Homestake #1, 2, 2a veins and the Shaft vein. Between 1928 and 1931, the area was explored by a 26.8 m shaft and 38.4 m of drifting, from which a few tons of high-grade direct shipping ore were sent to a smelter. Open-pit excavation and trenching on the showing were conducted through the 1960s and ‘70s. Previous trenching at the Homestake No.1 vein (trench H-TR4) intersected 2,844 g/t Ag, 0.30 g/t Au, 25.9% Pb and 6.1% Zn across 4m. Highlighted samples are not necessarily representative of all mineralization hosted in the area. See Technical Report on the Keno-Lightning Project dated July 31, 2010 available under the Company’s profile at Sedar.com for detailed exploration data.

The Homestake Area was an area of focus for more recent work in 2007 and 2011 including trenching, soil grid sampling, structural mapping and drilling. This work returned encouraging results with Keno style mineralization encountered from drilling in 2011 with grades of 1,696 g/t Ag over 1.4 m, 1,787 g/t Ag over 0.5 m and 1,183 g/t Ag over 1.6 m in three different holes. In total, 9 holes from the 2011 drilling campaign at Homestake returned grades of over 300 g/t Ag.

The predominate mineralization style at Homestake is typical of the Keno Hill district but with significantly higher gold content in some areas including the Homestake #2 vein. Trench sampling of the Homestake #2 vein in 2011 returned channel samples up to 11.5 g/t Au over 0.35 m. Surface sampling in 2016 also returned grades of 10.62 g/t gold, 370 g/t Ag, 12.13% lead and 0.062% Zn. Selective surface sampling along the Homestake #1 vein during the fall of 2016, returned the following positive results:

Sample_no

Location

Ag g/t

Au g/t

Pb %

Cu %

Zn %

Ag Eq. g/t

1501203

Homestake #1

6,562

1.3

3.30

0.79

17.834

7,534

1501210

Homestake #1

370

10.62

12.13

0.02

0.062

1,551

1501211

Homestake #1

340

0.08

0.28

0.02

1.413

412

Divide and Faith Target Areas

The Divide and Faith target areas show at least four veins and cover the projected southern extensions of the Caribou and Avenue Veins. The presence of multiple veins that intersect each other and are offset by faults, sets up favourable conditions for Keno Hill oreshoots. The Divide and Faith targets have received little modern exploration outside of prospecting and soil sampling and have more cover than other targets areas on the property.

A soil geochemical survey over the area in 2011 returned an 800 x 900 m gold, silver and pathfinder element anomaly. The area is a priority for further soil sampling, detailed geological mapping and trenching.

Avenue and Beauvette Target Areas

Beauvette Hill, the location of the Avenue and Beauvette targets (see Figures 3 and 4), has seen little historic work but is directly on-trend with several productive mineralized structures from the Keno Summit area and appears to be underlain by what may be a significant array of greenstone bodies. In addition to the Keno Hill deposit, the Sadie Ladue mine, which produced 12.7 Moz of silver, is an example of a greenstone hosted deposit in a similar structural setting located on the north side of the Keno Summit area2.

Avenue is an area of quartzite and greenstones that is intermittently exposed over a strike length of 1.2 kilometres which has a coincident lead, zinc and silver soil anomaly in areas typified by shallow cover. The Avenue target is on-trend with several highly-mineralized veins where they continue into what is believed to be an array of significant parallel greenstone bodies, masked under shallow cover.

Surface sampling in 2016 at Beauvette Hill area resulted in the discovery of a new sulphide-rich vein showing at a quartzite and greenstone contact.

Footnotes

1The material scientific and technical information in respect of Alexco’s Keno Hill Silver District Project is based upon information contained in the technical report dated March 28, 2017, entitled “Alexco and Silver Wheaton Amend Silver Purchase Agreement and Alexco Announces Positive Preliminary Economic Assessment for Expanded Silver Production at Keno Hill” which is available under Alexco’s profile on Sedar.com.

2Cathro, R. J. (Bob). Great Mining Camps of Canada 1. The History and Geology of the Keno Hill Silver Camp, Yukon Territory. Geoscience Canada, [S.l.], Sept. 2006. ISSN 1911-4850; Boyle, R.W., 1965. “Geology, Geochemistry, and Origin of the Lead-Zinc-Silver Deposits of the Keno Hill – Galena Hill Area, Yukon Territory”. Bulletin 111, Geological Survey of Canada.

Readers are cautioned that there is no certainty that the PEA will be realized and it includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. Mineral resources are not mineral reserves and do not have demonstrated economic viability. Additionally, a production decision which is made without a feasibility study of mineral reserves demonstrating economic and technical viability carries additional potential risks which include, but are not limited to, the risk that additional detailed work may be necessary with respect to mine design and mining schedules, metallurgical flow sheets and process plant designs, and the noted inherent risks pertaining to the inclusion of approximately 6% inferred mineral resources in the mine plan.

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