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Smokebush Project

Location & Access

The Smokebush Project Area is located approximately 85 kilometres east northeast of the Perenjori township and 65 kilometres west of Paynes Find within the Yalgoo Mineral Field.

The project is contained within four contiguous Prospecting Licenses (P59/2125, P59/2126, P59/2127 & P59/2128) and one Exploration Licence (E59/2234) enclosing a total area of approximately 1,254 hectares (Figure 1).

The tenements can be accessed via the unsealed Perenjori - Warriedar Road, and thence via extensive historical exploration grid lines, station tracks and fences lines.

Refer to ASX release: 02 December 2018 - Farm-in Agreement for the Smokebush Gold Project at Mt Mulgine, 65km West of Paynes Find WA.

Historic Data Review

The data review has identified extensive untested surface gold geochemical anomalies as well as highlighting significant RC and RAB gold drilling intersections from sparse first pass drilling.

The best historical results include:

Monza:

  • 2m @ 11.3g/t Au from 70m (MMRC162 - RC)
  • 2m @ 9.2g/t Au from 24m (MMRC154 - RC)

Hurley & T17:

  • 10m @ 1.4g/t Au from 15m (MM084 - RAB)
  • 2m @ 2.5g/t Au from 51m (MMRC074 - RC)

Wildflower:

  • 15m @ 1.4g/t Au from 10m (MM110 - RAB)

The historic drilling is considered sparse and requires follow up exploration activities to property test these significant results.  Terrain is now planning a site visit to gain a better understanding of the possible controls of mineralisation before designing the next stage of exploration activities.

Figure 1: Smokebush Project Location

Figure 1: Smokebush Project Location (Tenements outlines in Red)

Figure 2: Interpreted Geology Mt Mulgine with the Smokebush tenements in blue outlines

Figure 2: Interpreted Geology Mt Mulgine with the Smokebush tenements in blue outlines

Geochemical Targets

Substantial historical surface geochemical sampling programs have been conducted across the area of the tenements (Figure 4). The majority of geochemical data generated during the historic gold exploration programs consistently analysed gold, arsenic and copper (Figures 5, to 11). Analysis for tungsten and its stablemate, molybdenum, were less frequent (Figure 8), and the appearance of analysis for those particular refractory elements seems to have been a function of trends in the tungsten market.

The historic publicly open file surface geochemical gold and chalcophile assays (As, Cu) were imported and gridded using Mapinfo (Inverse Distance Squared interpolation) to generate geochemical images for gold, arsenic and copper (Figure 9 to 11). Rock chip samples were also included in this review.

The historical gold exploration targets at T13, Monza, Hurley, Wildflower and T16 are defined by elevated gold soil geochemistry >19ppb (0.019 ppm). Elevated arsenic >20ppm is coincident with all of the gold anomalies, however the elevated arsenic geochemistry on the western part of E59/2234 is pervasive and a broad zone of +80ppm arsenic in that area seems to be associated with a major structural contact between granite and greenstone (Figure 2 & 10).

Figure 4: Thematic map showing historical surface geochemical samples

Figure 4: Thematic map showing historical surface geochemical samples

Figure 5: Thematic map of surface gold geochemistry

Figure 5: Thematic map of surface gold geochemistry

Figure 6: Thematic map of surface arsenic geochemistry

Figure 6: Thematic map of surface arsenic geochemistry

Figure 7: Thematic map of surface copper geochemistry

Figure 7: Thematic map of surface copper geochemistry

Figure 8: Thematic map of surface tungsten geochemistry

Figure 8: Thematic map of surface tungsten geochemistry

Figure 9: Surface geochemical image for gold and target areas

Figure 9: Surface geochemical image for gold and target areas

Figure 10: Two Surface geochemical image for arsenic

Figure 10: Two Surface geochemical image for arsenic

Figure 11: Surface geochemical image for copper

Figure 11: Surface geochemical image for copper

Review of Historic Drilling Data

A compilation of all open file historical drilling was compiled as part of the project due diligence.  This was conducted over the entire project area.  To date drilling has focussed mainly on the six prospect area’s depicted in Figure 9. Significant gold interceptions >0.5 ppm were calculated and tabulated (Tables 1 to 4).

Monza & T13 Targets

The Monza and T13 targets occur within a 750m x 500m gold soil geochemical anomaly >19 ppb in the southwestern corner of P59/2128 (Figure 12). A “bullseye” of >2 g/t Au on the geochemical image is due to significant rock chip surface samples (peaking at 10.37g/t Au). The soil anomalies have been drill tested by 12 angled RC drill holes (drilled towards the west and Southwest).

Terrain’s due diligence review of historic data at the Monza target has identified the possible narrow high grade plunging mineralised zone that is open to the north under the existing drilling.  Significant intercepts include 2m @ 11.3g/t Au from 70m in hole MMRC162 and 2m @ 9.2g/t Au from 24m in hole MMRC154 (Table 1).  Further RC drilling is required to confirm geometry of this high-grade plunging zone and test the potential down plunge potential to the north.

Hole ID

Type

TD
(m)

Easting
(MGA94Z50)

Northing
(MGA94Z50)

RL
(m)

Dip
(°)

Azimuth
(°)

From
(m)

To
(m)

Interval
(m)

Au
(g/t)

MMRC032

RC

96

500191

6773609

386

-60

270

41

42

1

2.54

               

75

76

1

0.75

MMRC034

RC

120

500220

6773558

383

-60

270

3

6

3

0.88

MMRC036

RC

100

500180

6773659

388

-60

270

88

89

1

1.36

MMRC070

RC

66

500528

6773642

381

-60

250

29

30

1

0.60

               

36

39

3

0.55

MMRC154

RC

132

500551

6773598

379

-60

250

24

26

2

9.20

MMRC155

RC

120

500575

6773605

379

-60

250

69

71

2

0.70

MMRC157

RC

120

500536

6773698

381

-60

250

62

65

3

1.22

MMRC162

RC

132

500551

6773650

381

-60

250

63

65

2

4.21

               

70

72

2

11.34

               

80

83

3

0.65

               

108

110

2

0.58

MMRC235

RC

120

500515

6773693

382

-60

250

30

44

14

0.69

MMRC238

RC

132

500569

6773656

381

-60

250

101

103

2

2.71

 

Table 1: Monza & T13 Summary of significant gold intercepts (>0.5g/t Au)

Figure 12: Monza and T13 target area drill hole location and soil gold geochemistry

Figure 12: Monza and T13 target area drill hole location and soil gold geochemistry

Hurley & T17 Targets

The Hurley and T17 Targets occur on the western part of P59/2126 (Figure 13), within a broad zone of elevated arsenic in soil (>20ppm). The Hurley target is defined by a 250 m x 250 m gold soil anomaly (>19 ppb) that peaks at 1.33g/t Au. T17 does not express any surface gold anomalism and was targeted based on a geophysical structural interpretation of the area. A total of 5 angled RAB and 14 angled RC holes (drilled towards the west and northwest) have been completed over these targets. Significant interceptions >0.5g/t Au include 5m @ 6.1g/t Au from 55m in hole MMRC004 and 2m @ 2.5g/t Au from 51m in hole MMRC074 (Table 2).

The due diligence data review has highlighted questions around the historic drilling drill orientation and collar locations that need to be field examined prior to any drill testing.

Hole ID

Type

TD
(m)

Easting
(MGA94Z50)

Northing
(MGA94Z50)

RL
(m)

Dip
(°)

Azimuth
(°)

From
(m)

To
(m)

Interval
(m)

Au
(g/t)

MM084

RAB

40

501690

6773250

362

-60

290

15

25

10

1.40

MMRC004

RC

147

501727

6773268

361

-60

270

55

60

5

6.14

MMRC048

RC

138

501770

6773228

359

-60

 

43

44

1

0.50
(0.47)

 

 

 

 

 

 

 

 

116

117

1

0.72

MMRC050

RC

150

501653

6773228

360

-60

328

32

33

1

0.78

MMRC074

RC

90

501728

6772650

369

-60

324

51

53

2

2.47

 

Table 2: Hurley & T17 summary of significant gold intercepts (>0.5g/t Au)

Figure 13: Hurley & T17 target area drill hole location and gold geochemistry

Figure 13: Monza and T13 target area drill hole location and soil gold geochemistry

T16 Target

The T16 target is defined by a 750m x 500m zone of anomalous (>19ppb Au) gold in soil (peaking 280 ppb Au) located in the central part of tenement (E59/2234) (Figure 14). T16 has been tested by five angled RC holes (drilled towards the north), four of which have returned significant gold values.

Significant results >0.5g/t Au include 1m @ 1.4g/t Au from 97 m in hole MMRC044 and 2m @ 0.83g/t Au from 86m (Table 3).  At a lower cut-off grade (>0.1g/t Au) the T16 target drilling highlights some wide zones of lower gold anomalism (13m @ 0.39g/t Au from 84m in hole MMRC123 and 16m @ 0.29g/t Au from 94m in hole MMRC044) that suggest that the current drilling may be on the edge of a wider zone of significant mineralisation.  Drilling along strike of these wider zones of mineralisation is being planned. 

Hole ID

Type

TD
(m)

Easting
(MGA94Z50)

Northing
(MGA94Z50)

RL
(m)

Dip
(°)

Azimuth
(°)

From
(m)

To
(m)

Interval
(m)

Au
(g/t)

MMRC043

RC

102

497742

6768320

352

-60

350

70

71

1

0.66

MMRC044

RC

138

497754

6768200

353

-60

350

20

21

1

0.53

 

 

 

 

 

 

 

 

97

98

1

1.40

 

 

 

 

 

 

 

 

106

107

1

0.53

MMRC045

RC

95

497781

6768084

349

-60

350

84

85

1

0.50

MMRC123

RC

140

497881

6768102

349

-60

350

86

88

2

0.83

Table 3: T16 summary of significant gold intercepts >0.5g/t Au

Figure 14: T16 target drill hole location and gold geochemistry

Figure 14: T16 target drill hole location and gold geochemistry

Wildflower Target

Wildflower comprises a 1.0 km x 500 m gold in soil anomaly (>19ppb Au) located in the north-eastern part of Butler Tenement (E45/2234) (Figure 15). The target has had limited drilling completed to date with 35 RAB holes (mostly less than 5m depth) and one angled RC hole (drilled towards the west) completed. Significant results (>0.5g/t Au) include 5m @ 1.0g/t from 100m in hole MMRC001 and 15m @ 1.49g/t from 10 m in hole MM110 (Table 4). Those results are based on five metre composite samples; the author was unable to locate any data on re-splits of those intervals to provide better resolution. 

The current level of drilling was completed on 270m line spacing, which is considered to be wide spaced and not adequately tested the widespread gold anomaly (peaking at 226 ppb Au).  Given that the above-mentioned gold anomalism intersected in the limited drilling is open at depth and along strike further drilling is required to delineate the extents to this gold mineralisation.

Hole ID

Type

TD
(m)

Easting
(MGA94Z50)

Northing
(MGA94Z50)

RL
(m)

Dip
(°)

Azimuth
(°)

From
(m)

To
(m)

Interval
(m)

Au
(g/t)

MGRB428

RAB

4

499539

6769474

406

-90

 

0

4

4

0.43

MGRB430

RAB

2

499639

6769470

401

-90

 

0

2

2

0.77

MGRB474

RAB

30

499446

6769393

370

-60

360

28

30

2

1.09

MM110

RAB

40

499416

6769394

370

-60

270

10

25

15

1.49

MMRC001

RC

141

499465

6769395

370

-60

270

100

105

5

1.03

Table 4: Wildflower summary of significant gold intercepts >0.5g/t Au

Figure 15: Wildflower target drill hole location and gold geochemistry

Figure 15: Wildflower target drill hole location and gold geochemistry

Conclusions & Recommendations

A review of the publicly available open-file data on the Smokebush Project tenement package identified exploration targets that have not adequately been followed up.  Historic exploration geochemical surface sampling programs has defined a number of gold and chalcophile soil anomalies within the area of the tenement package that have not been either drill tested or the limited drilling that has been conducted is considered still open. Drilling by previous operators, including some RC drilling conducted as recently as 2014, returned significant gold intersections >0.5g/t Au from all of those geochemical anomalies. There are further well define gold and arsenic surface soil anomalies that have yet to been drill tested.  This provides Terrain an opportunity to properly test these anomalous soil anomalies and follow up on already identified gold mineralisation in historic drilling.  A structural geological investigation should be prioritised, to develop an exploration model and a program of works filed to enable on-going drill testing of the multiple geochemical targets.

Of the limited amount of drilling completed on the above-mentioned exploration targets a field reconnaissance trip is planned in the first quarter of 2020 to determine if the historic drilling orientation is optimal to the underlying geology and surface footprint of anomalism.  This trip will also comprise historic drill hole collar position verification and mapping of any areas of subcropping mineralisation.  Further soil sampling over the south western corner of tenement E59/2234 is planned over an area that has prospective aeromagnetic features that has no historic soil samples completed.  This is considered to be high priority as this will generate further surface anomalies for future drill testing. 

Several gold open pit mines have been developed on the western parts of the Mt Mulgine Anticline, however the eastern parts, corresponding with the Smokebush Project tenement package, are relatively under-explored.