San Domingo
Overview

San Domingo is a lithium pegmatite project located in the Maricopa and Yavapai counties, Arizona. It was historically mined for lithium in the 1940’s and 50’s. Access to the project locations is via a dirt road 7 miles from Arizona Highway 74 that connects Wickenburg and Phoenix.

Tinywow 18 SD Exploration Results map 4648360 1
Yellow pattern

Project Highlights

A maiden drill programme commenced at our pegmatite asset during July 2022. A total of 7,000m diamond core drilling was planned, with 7,300m or 47 holes being completed. Lithium bearing minerals (spodumene and minor lepidolite) have been identified in c.60% of the total holes completed and importantly the programme has only covered just over 1% of the 23km2 that Bradda holds at San Domingo, in Arizona.

Following receipt of the final assay results in May 2023, the results not only demonstrate significant intersections of pegmatites with visible lithium minerals in the Northern Claim blocks, but also that the Company has intersections of visible spodumene at the Central Claim blocks too (Lower Jumbo and Jumbo), strengthening the presence of a 10.5km mineralised trend.

The Company also completed an extensive soil sampling programme across the majority of the 23km2 landholding, with very promising results showing priority targets along the complete 10.5km mineralised trend. Alongside of soil sampling, Bradda’s geologists, following a review of the GPR work carried out in 2021/2022, initiated a structural mapping programme to help with drill hole targeting.

Highlights from the assay results include:

Central Claims:

5.94m @ 1.22% Li2O in SD-DH23-046

4.72m @ 0.67% Li2O in SD-DH23-038a

9.54m @ 1.85% Li2O, 3.02m @1.49% Li2O, and 2.90m @ 3.03% Li2O in SD-DH23-037

7.35m @ 0.68% Li2O, 4.79m @ 0.87% Li2O, 3.20m @ 1.22% Li2O, and 3.21m @ 0.75% Li2O in SD-DH23-036

9.85m @ 0.86% Li2O in SD-DH23-034

4.02m @ 1.27% Li2O in SD-DH23-035

Northern Claims:

31.85m @ 1.60% Li2O (including 3.90m @ 2.88% Li2O, and 20.03m @ 1.97% Li2O (including 7.06m @ 1.92% Li2O, 3.21m @ 3.74% Li2O and 3.81m @ 3.25% Li2O)) in SD-DH22-024

6.52m @ 1.24% Li2O in SD-DH23-041

2.74m @ 2.12% Li2O in SD-DH23-042

1.77m @ 1.10% Li2O in SD-DH23-040

3.75m @ 2.37% Li2O, 0.85m @ 2.44% Li2O, 1.10m @ 0.82% Li2O, and 0.67m @ 1.77% Li2O in SD-DH22-025

9.75m @ 0.78% Li2O (including 5.36m @ 1.20% Li2O) in SD-DH22-003

4.27m @ 1.86% Li2O in SD-DH22-005

2.44m @ 1.63% Li2O in SD-DH22-001

2023 drill programme

A follow-up drill programme commenced during August 2023, with highlights including:

  • Preliminary core drilling was conducted at Midnight Owl, Bolt, and Lone Giant in the northern part of San Domingo, amounting to 1,877m in 22 shallow core holes
  • This programme is follow-up core drilling to Midnight Owl’s previous programme that encountered 31.85m @ 1.60% Li2O in hole SD-DH22-024 at a depth of 26.82m
  • Drill hole SD-DH23-049 at the Midnight Owl target discovered a new zone deeper than found in hole 24:
    • 6.35m containing 0.83% Li2O at 87.33m depth
    • 3.05m of 1.03% Li2O at 98.60m depth
  • Drill holes at the new Bolt target, located 800m east of Midnight Owl include:
    • 5.27m at 0.51% Li2O within a broader interval of 24.65m carrying 0.24% Li2O in SD-DH23-057
    • 5.87m containing 0.48% Li2O contained within 11.8m of 0.32% Li2O in SD-DH23-059
  • Core holes at Bolt have detected anomalous levels of tantalum with intervals coincident to the lithium intercepts

San Domingo North Drill Hole Highlights

Hole

From

To

Int (m)

Li2O %

Ta2O5

Sn (ppm)

Target

SD-DH23-048

19.42

36.24

16.82

73

Midnight Owl

26.3

26.3

9.12

105

SD-DH23-049

87.33

93.67

6.35

0.83

Midnight Owl

89.18

94.34

5.16

80

97.9

102.17

4.27

82

98.6

101.65

3.05

1.03

71

SD-DH23-050

98.02

101.89

3.87

70

Midnight Owl

SD-DH23-057

18.07

42.73

24.65

0.24

47

Bolt

34.35

39.62

5.27

0.51

58

SD-DH23-059

2.80

40.23

39.37

37

27.13

28.35

1.22

0.17

47.43

52.97

5.54

92

Bolt

68.03

79.86

11.8

0.32

42

68.03

73.91

5.87

0.48

43

SD-DH23-061

134.57

136.25

1.52

0.52

Bolt

134.57

138.56

4.00

72

SD-DH23-065

1.52

9.45

7.93

0.10

45

3.35

4.88

1.52

0.31

Bolt

SD-DH23-066

28.9

32.13

3.23

127

Bolt

*All drill depths are from surface

Preliminary Metallurgical test work on Phase I core from the Jumbo Target contain positive results, described in the November 20, 2023 PR:

  • Three composite samples were selected for test-work, representing the low grade, medium grade and high-grade environment reflected in the maiden 2022/2023 exploration programme previously reported from drilling undertaken at the Jumbo Target in the San Domingo Pegmatite district in Arizona.
  • After discussion with SGS Canada, an initial HLS test was undertaken to evaluate the potential for dense media separation (“DMS”) to produce a sellable Li-oxide concentrate product. This test work is predominantly preliminary in its approach. The measured head grade of the samples were 3.05% Li2O, 1.03% Li2O and 0.34% Li2O, reflecting the high, medium and low-grade range seen in our drilling results to date.
  • Despite the preliminary nature of this test-work programme, it was highly encouraging to see the medium-grade sample produce an ‘in spec’ lithium oxide concentrate product with a 6.0% Li2O grade and an interpolated recovery of contained lithium to the concentrate of 50.3%, at a ¼” size crush size. Tailings rejection was considered efficient in this scenario with the rejection of 60.6% mass and a loss of only 2.1% lithium.
  • Alternately, at a crush size of 3/8” (9.5 mm), a concentrate was produced with a grade of 5.5 % Li2O at a 55.5% recovery of contained lithium oxide. This is still considered in spec in the current market. ‘In spec’ Li concentrates currently sells in the Lithium-Oxide Spot Market for circa US$2,100/ tonne.
  • Using the medium-grade sample, the flotation feed, a combination of middling product from the HLS testing at a crush size of ¼” and under sized fraction (minus 0.85 mm), recorded an upgraded value of 1.57% Li2O with Li distribution of 47.0% and a mass distribution of 30.5%.
  • At our request, SGS Canada also undertook Tescan Integrated Mineral Analyzer analysis of the medium grade sample, finding a dominance of spodumene as the primary lithium mineral with possible, but very minor petalite and eucryptite, along with muscovite, minor beryl, tourmaline, calcite, and apatite. The overall iron content is low, <1.0%, indicative of a very good concentrate product.
  • Bradda is currently undertaking a second drilling programme at its San Domingo Pegmatite District with approximately 75% of the programme being complete. Assay results to date were released on November 12 2023, highlighted by drill hole SD-DH23-049 which contains 6.35m @ 0.83% Li2O followed by 3.05m @ 1.03% Li2O, with more results arriving in the near future.
  • Metallurgical test work is now currently on hold whilst Bradda collects more representative samples from this next phase of drilling to undertake a more detailed test work programme.
white pattern

Next Steps

Phase II core drilling continues on the Central targets including Jumbo, White Ridge, and Joker with the addition of Morning Star in the southwest section of the claim block. Drill holes at Jumbo are designed to offset Phase I drill intercepts, work at White Ridge will test outcropping spodumene and lepidolite mineralization seen at surface, and new holes will cross-cut spodumene bearing pegmatites at Joker. The Morning Star drilling, on State Lands, is targeting spodumene bearing pegmatite where historic drilling by Anaconda in the 1940’s and 1950’s verified the presence of lithium bearing pegmatites in the subsurface. While no assays were found, the drill logs indicate the presence of lithium minerals and form a compelling and shallow target.

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Arizona

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Our Projects

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Pegmatite projects:

San Domingo Lithium Pegmatite district

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