North Jumbo

System Type:

Low sulfidation, volcanic hosted, epithermal system, comprising of quartz-calcite veins with broad zones of brecciation and surrounding stockwork veining.

Strike-Length:

North Jumbo has been traced over a north-south strike length of 1,500 metres through drilling and surface exposures.  The resource remains open to the north and to the southwest.  

Resource: 

Category

Pit-Constrained - 0.25 g/t gold cutoff

Tonnes

(1000s)

Au

Ag

Grade
(g/t)

Troy oz
(1000s)

Grade
(g/t)

Troy oz
(1000s)

Measured

8,456

0.53

143

13.3

3,616

Indicated

8,617

0.47

130

11.0

3,060

Measured Plus Indicated

17,073

0.50

273

12.2

6,676

Inferred

2,556

0.46

38

7.2

591

The North Jumbo mineral resource has an effective date of May 1, 2020. The inferred resource is in addition to the measured and indicated resource. Mineral resources that are not mineral reserves do not have demonstrated economic viability.  Numbers have been rounded, which may lead to some numbers not adding up exactly. The resource estimate reflects gross metal content that is not adjusted for metallurgical recoveries.

Location:

The North Jumbo is located on the Utah side of the Gold Springs project 1,500 meters north of the South Jumbo resource.  

Drilling:

A total of 95 holes have been drilled at North Jumbo for a total of 14,893 meters. The drill-holes extend over a 1500-meter strike length mineral system, which is open to expansion to the north and southwest.
By the end of August 2021, the company had drilled 9 new holes at North Jumbo with the following location:


Highlights included:

  •   2.10 g/t gold with     3.4 g/t silver over   3.1 meters in hole J-21-001
  •   4.32 g/t gold with   10.3 g/t silver over   1.6 meters in hole J-21-001
  •   5.95 g/t gold with   66.5 g/t silver over 24.4 meters, which includes
    27.30 g/t gold with 259.4 g/t silver over   4.6 meters, and
      0.52 g/t gold with     4.7 g/t silver over 82.3 meters in hole J-21-006

Drilling results:

Hole

From (m)

To (m)

Thickness (m)

Gold (g/t)

Silver (g/t)

J-21-001

140.2

143.3

3.1

2.1

3.5

J-21-002

6.1

9.1

3.0

0.46

7.5

J-21-003

88.4

99.1

10.7

0.62

7.91

JP-21-004

178.3

179.8

1.5

1.02

99.7

J-21-006

118.9

143.3

24.4

5.95

66.5

including

129.5

134.1

4.6

27.3

259.4

and 

192.0

274.3

82.3

0.52

4.7

including

192.0

217.9

25.9

0.68

5.7

J-21-008

73.1

80.8

7.7

0.98

8.9

J-21-009

166.1

176.8

10.7

0.51

6.3

J-21-010

187.4

193.5

6.1

0.97

3.0

J-21-011

74.7

76.2

1.5

1.13

8.9

and

155.4

161.5

6.1

0.61

12.9

J-21-015

108.2

271.3

163.1

0.93

  5.1

including

108.2

141.7

   33.5

1.32

  7.4

including

109.7

120.4

   10.7

3.07

13.5

including

109.7

114.3

     4.6

5.89

20.5

including

147.8

271.3

123.5

0.87

  4.7

J-21-016

93.0

102.1

9.1

1.76

44.0

including

94.5

99.1

4.6

3.08

83.0

and

132.6

147.8

15.2

0.41

18.6

J-21-024

21.3

29.0

7.7

2.72

12.9

Drill hole table:

Hole ID

Target

Easting  UTM NAD 27

Northing

Elevation Meters

Azimuth

Inclination

TD (m)

J-21-001

North Jumbo

760970

4198171

2045

315

-55

249.9

J-21-002

North Jumbo

761241

4198454

2076

290

-60

184.4

J-21-003

North Jumbo

761075

4198412

2088

90

-50

243.8

J-21-004

North Jumbo

761296

4199100

2172

270

-45

213.3

J-21-005

North Jumbo

761208

4199326

2141

270

-45

219.4

J-21-006

North Jumbo

761326

4199699

2121

270

-70

274.3

J-21-007

North Jumbo

761445

4199524

2128

270

-50

243.8

J-21-008

North Jumbo

761094

4198611

2064

50

-60

204.2

J-21-009

North Jumbo

761447

4199450

2115

270

-70

243.8

J-21-010

North Jumbo

761324

4199760

2131

270

-70

329.2

J-21-011

North Jumbo

761328

4199693

2135

245

-70

329.2

J-21-012

North Jumbo

761254

4199690

2130

270

-80

329.2

J-21-013

North Jumbo

761335

4199763

2129

90

-65

329.2

J-21-014

North Jumbo

761389

4199615

2111

270

-60

274.3

J-21-015

North Jumbo

761334

4199566

2123

270

-75

271.3

J-21-016

North Jumbo

761337

4199514

2111

290

-75

259.1

J-21-017

North Jumbo

761285

4199799

2140

270

-80

274.3

J-21-018

North Jumbo

761300

4199902

2141

0

-90

326.1

J-21-019

North Jumbo

761308

4200011

2155

270

-70

326.1

J-21-020

North Jumbo

761345

4200307

2189

270

-60

326.1

J-21-021

North Jumbo

761336

4199837

2126

270

-70

326.1

J-21-022

North Jumbo

761366

4199659

2154

0

-90

243.8

J-21-023

North Jumbo

761349

4199466

2120

290

-70

326.1

J-21-024

North Jumbo

761361

4199537

2113

270

-75

259.1

J-21-025

North Jumbo

761343

4200043

2177

270

-75

274.3

J-21-026

North Jumbo

761281

4199523

2104

290

-65

243.8

Geophysics:

The gold mineralization at the North Jumbo resource is closely associated with strong north-south trending ZTEM (airborne geophysical survey) and CSAMT (ground geophysical survey) resistivity highs. The resource is located along the eastern boundary of these high resistivity features which extend well beyond the current drilling. 

Geology:

The north Jumbo resource area consists of a continuous structural zone that can be traced on surface for 1,500 meters before it is obscured by post-mineral cover to the north. The North Jumbo target area is characterized by a prominent vein and breccia corridor up to 30 meters wide along the north-south striking, easterly dipping Jumbo fault. The Jumbo structure has developed breccia and stockwork mineralized zones over 100-200 meters in thicknesses which are footwall to the structure and make up the bulk of the resource. The southern portion of the resource is characterized by numerous veins and stockwork zones over a broad area of up to 150-200 meters wide. 

The potential for the extension of the Jumbo resource to the north is primarily defined by the ZTEM and CSAMT surveys which suggest the system may extend for an additional 1,200 meters. Most of this northern area is covered by post-mineral colluvium and andesite flows with discrete windows that reveal altered volcanic rocks and vein material. In 2015 and 2016, drilling programs intercepted sub-surface mineralization beneath this post mineral cover. Recent mapping has identified windows in the post mineral cover north and west of the current drilling which reveal areas of strong alteration and veining extending over broad areas. 

Structural Geology: 

Structure at North Jumbo features two dominant north-south striking faults, the Jumbo fault on the east and the Etna fault on the west. These are long-lived deep-seated faults which control the mineralization seen within the Jumbo trend. They are Basin and Range extensional normal faults which also had a lateral movement component. It is this lateral movement that created areas of extension and brecciation that host the resource. 

Historical Mining:

Several historic tunnels, shafts and pits are found within the North Jumbo target area. Production from these mines was reported to be from narrow high-grade veins which were exploited over a limited strike length of 30-50 metres.

Geochemistry:

Within the North Jumbo resource area, there is a massive quartz and quartz/calcite vein that can exceed 5 meters in width and forms a rib known as Jumbo Ridge. The central quartz vein is dense, fine-grained quartz, which on close examination will exhibit relict rounded pebble breccias, banding, and bladed texture after calcite. The distribution and rounded form of the breccia clasts indicate that they are derived from repeated hydrothermal brecciation and fluidization within the vein system. In some areas, the breccia consists of angular silicified wallrock clasts in a quartz matrix. The quartz veins exhibit bladed texture, which suggests that boiling occurred within the hydrothermal system. in 1985 (pre-43-101) blasted trenches across the massive and silicified Jumbo Ridge. These results are presented only as an historical context, they provide evidence of the strong gold mineralization within the North Jumbo system. The following are the results of the Energex trench sampling. 

Trench ID

Length

Gold g/t

Silver g/t

J85TD1

5.54

1.36

26.0

J85TD3

1.52

3.54

29.0

J85TD6

1.37

4.54

18.0

J85TD6

1.42

22.31

37.0

J85TD7

1.52

2.12

11.5

J85TD10A

0.91

1.86

14.0

J85TD11

1.71

6.61

75.6

J85TD13

1.43

1.62

82.2

J85TD17

1.37

0.39

115.6

Adjacent to the veins and breccias, extensive areas of quartz stockwork veining becomes more diffuse outward from the main vein structures and grades into crackle fractures, breccias, and silicified rock. These areas typically carry gold values of 0.25-1.5 g/t Au as seen in the GRC drilling.

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