Arizona Sonoran Drilling at MainSpring Confirms Near Surface Mineralization

Arizona Sonoran Copper Company Inc. reports that drilling at MainSpring…


Arizona Sonoran Copper Company Inc. reports that drilling at MainSpring on its 100%-owned Cactus Project, Arizona, confirms near surface mineralization up-dip from the Parks/Salyer deposit (see FIGURES 1-11). A total of 17,650 ft (5,380 m) of drilling or 16 holes are reported herein, with 10 holes pending. The 2024 MainSpring inferred drill program (500 ft | 152 m drill spacing) is now complete and drilling continues to define indicated drill spacings (250 ft | 76 m drill spacing) with 3 drill rigs.

ImageForNews 17866 17109972189086988
MainSpring – Parks/Salyer Plan View. Image Credit: Business Wire

Drilling at MainSpring has (1) extended the High Grade Mine Trend at Parks/Salyer by 650 ft (198 m) to the southwest, and (2) traces lower grade mineralization another 2,500 ft (762 m) south, to within 140 ft (42 m) of surface. Drilling on the MainSpring Property illustrates a continuation of the porphyry system that hosts the Cactus Project deposits. The lower grade and near surface MainSpring mineralization is currently being drill tested as a potential starter open pit within a pending Preliminary Economic Assessment (“PEA”), which will be inclusive of a maiden MainSpring inferred resource and the application of the Nuton technologies to the primary sulphides using the same PFS assumptions, as announced on FEB 21, 2024. The PEA is expected in the summer 2024 with M3 Engineering as lead consultant.

Highlights:

– The MainSpring zone is the southern extension of Parks/Salyer, as it daylights towards surface to within 140 ft (42 m) of surface.

– MainSpring is drilled over an area of at least 2,500 ft x 3,000 ft (762 m x 915 m), up-dip of Parks/Salyer

– ECM-198: Extends Parks/Salyer High Grade Mine Trend by 650 ft (198 m) to the Southwest.

  • 882 ft (269 m) @ 0.44% CuT of Continuous Mineralization
    • Incl 83 ft (25 m) @ 1.41% CuT, 1.30% Cu TSol, 0.023% Mo (enriched)

– ECM-209: 256 ft (78 m) @ 0.51% CuT, 0.44% Cu TSol, 0.003% Mo (Oxide)

  • Incl 98 ft (30 m) @ 0.95% CuT, 0.87% Cu TSol, 0.004% Mo

– ECM-197: 367 ft (112 m) @ 0.31% CuT, 0.26% Cu TSol, 0.002% Mo (Oxide)

  • 125 ft (38m) @ 0.56% CuT, 0.47% Cu TSol, 0.003% Mo (enriched)

NOTE: True widths are not known

George Ogilvie, Arizona Sonoran President and CEO commented, “We are encouraged by the MainSpring drilling results to date. Since acquiring the asset in 2020 with only a Stockpile and historic records, our team has done a tremendous job outlining a copper resource of 5.2 billion pounds M&I and 2.2 billion pounds Inferred*. With the issuance of our recent Pre-Feasibility Study, we reset our operational plan and economic outlook on the project based on this mineral resource, which includes reserves of 3.0 billion pounds** from our four deposits. Looking forward, MainSpring is now presenting us with a new opportunity for near term growth and further optimizations to the operations and financials. Our team’s main focus now is to integrate MainSpring into the rest of the project. Within the next two quarters, we plan on issuing an inferred mineral resource on MainSpring and a PEA on Cactus and Nuton, inclusive of MainSpring. Subsequent drilling to the indicated category will feed into an updated PFS inclusive of the MainSpring opportunity by end of the year. We have entered a transitional and transformational year for the Cactus Project.”

* Cactus Mineral Resources:

M&I: 446M tons @ 0.58% Cu for 5.2 Blbs copper

Inf: 234M tons @ 0.472% Cu for 2.2 Blbs copper

Resources at the Cactus project are a combination of leachable and primary mineralogizes

**Cactus Mineral Reserves: 276Mt @ 0.484% Cu TSol for 3.0 Blbs of copper

See PR dated FEB 21, 2024 for details related to the copper inventory

Drilling and Geology Recap

Of the 59 completed drill holes, 26 (35,529 ft | 10,828.3 m) were drilled in 2024, and 33 (35,718.9 ft | 10,887.1 m) were previously drilled by ASCU or the former option holder. The inferred drilling at MainSpring is defining a mineralized zone at least 2,500 ft by 3,000 ft (762 m x 915 m) that trends NW toward and is contiguous with the Parks/Salyer deposit. Drilling to date shows oxide and enriched mineralization as shallow as 140 feet (42 m) from the surface in the south, and to 450 ft (137 m) on the northern end with enriched and primary mineralization extending as deep as 2,250 ft (686 m) in hole ECM-198.

MainSpring is the southern extension of the Parks/Salyer horst block, at the southwestern end of the Cactus mine trend. Copper mineralization at MainSpring is hosted within brecciated granite and monzonite porphyry as are the Cactus West, Cactus East and Parks/Salyer deposits and the NE Extension target. Mineral Resources at the Cactus project are a combination of leachable and primary mineralogies. The Cactus West deposit and Parks/Salyer deposit-MainSpring area are preserved as uplifted horst blocks, bounded by normal faults to the east and west that juxtapose Gila Conglomerate against adjacent upper plate mineralization. The Parks/Salyer deposit, comprising an indicated mineral resource of 144 M tons @ 1.01% copper and an inferred mineral resource of 48 M tons @ 0.97% copper***, continues onto the MainSpring property to the south. The MainSpring mineralization, containing oxide, enriched and primary copper mineralization, thickens and increases in tenor to the north as it approaches the high-grade Parks/Salyer deposit. Drilling results at Parks/Salyer and MainSpring indicate that MainSpring could be the distal low-pyrite shell of the high-grade ore-shell at Parks/Salyer. Also intercepted to the very south of the MainSpring drilling is a late-stage quartz monzonite porphyry that is unmineralized but that contains slightly elevated primary copper grades at its margins. Drill hole ECM-198 (FIGURE 1) intersected thick primary mineralization and extends Parks/Salyer’s high-grade mine trend onto the north end of MainSpring and demonstrates that the zone between MainSpring and Parks/Salyer is an analogue for the moderately-graded pyrite-shell. The latest inferred drilling at MainSpring has focused on filling in the area between the deeper Parks/Salyer mineralization and the shallow MainSpring mineralization.

Table 1: Significant Drilling Intercepts

Hole

id

Zone

Feet

Meters

CuT

(%)

Cu Tsol

(%)

Mo

(%)

from

to

length

from

to

length

ECM-197

oxide

147.0

167.8

20.8

44.8

51.1

6.3

0.56

0.49

0.001

oxide/enriched

233.2

277.6

44.4

71.1

84.6

13.5

0.36

0.33

0.002

oxide

579.0

946.0

367.0

176.5

288.3

111.9

0.31

0.26

0.002

including

602.0

727.0

125.0

183.5

221.6

38.1

0.56

0.47

0.003

ECM-198

oxide

1,071.0

1,133.4

62.4

326.4

345.5

19.0

0.34

0.29

0.028

enriched

1,373.0

1,456.0

83.0

418.5

443.8

25.3

1.41

1.30

0.023

including

1,373.0

1,410.0

37.0

418.5

429.8

11.3

2.33

2.29

0.022

primary

1,456.0

2,255.5

799.5

443.8

687.5

243.7

0.34

0.03

0.007

including

1,508.5

1,588.0

79.5

459.8

484.0

24.2

0.47

0.04

0.014

and

2,067.0

2,157.0

90.0

630.0

657.5

27.4

0.43

0.04

0.007

ECM-199

oxide

197.0

261.2

64.2

60.0

79.6

19.6

0.10

0.04

0.001

oxide

475.0

527.0

52.0

144.8

160.6

15.8

0.28

0.27

0.002

enriched

558.0

642.0

84.0

170.1

195.7

25.6

0.44

0.42

0.001

including

558.0

578.4

20.4

170.1

176.3

6.2

1.37

1.35

0.001

primary

673.0

997.0

324.0

205.1

303.9

98.8

0.12

0.02

0.002

ECM-200

enriched

637.0

807.0

170.0

194.2

246.0

51.8

0.40

0.27

0.001

primary

807.0

953.0

146.0

246.0

290.5

44.5

0.17

0.018

0.001

including

925.0

953.0

28.0

281.9

290.5

8.5

0.32

0.02

0.002

ECM-201

oxide

208.0

245.0

37.0

63.4

74.7

11.3

0.12

0.08

0.001

enriched

290.0

305.5

15.5

88.4

93.1

4.7

0.70

0.67

0.001

oxide

345.0

408.6

63.6

105.2

124.5

19.4

0.25

0.20

0.001

enriched

533.4

553.0

19.6

162.6

168.6

6.0

0.43

0.42

0.000

enriched

618.6

707.0

88.4

188.5

215.5

26.9

0.58

0.51

0.006

including

686.3

707.0

20.7

209.2

215.5

6.3

1.22

1.20

0.002

primary

707.0

871.0

164.0

215.5

265.5

50.0

0.14

0.05

0.002

including

707.0

745.0

38.0

215.5

227.1

11.6

0.41

0.06

0.007

ECM-202

enriched

507.0

527.0

20.0

154.5

160.6

6.1

0.16

0.15

0.001

primary

550.0

702.0

152.0

167.6

214.0

46.3

0.47

0.04

0.012

including

570.0

612.0

42.0

173.7

186.5

12.8

0.77

0.05

0.021

ECM-203

oxide

228.0

315.0

87.0

69.5

96.0

26.5

0.18

0.10

0.001

including

267.7

300.5

32.8

81.6

91.6

10.0

0.30

0.22

0.002

enriched

315.0

389.0

74.0

96.0

118.6

22.6

0.26

0.24

0.001

including

315.0

352.6

37.6

96.0

107.5

11.5

0.38

0.37

0.001

enriched

458.3

472.6

14.3

139.7

144.0

4.4

0.58

0.55

0.001

enriched

518.3

636.0

117.7

158.0

193.9

35.9

0.31

0.28

0.001

ECM-204

oxide

74.5

86.7

12.2

22.7

26.4

3.7

0.24

0.16

0.005

oxide

438.0

487.2

49.2

133.5

148.5

15.0

0.27

0.22

0.002

ECM-205

oxide

206.0

240.0

34.0

62.8

73.2

10.4

0.55

0.48

0.002

including

228.0

230.2

2.2

69.5

70.2

0.7

5.98

5.31

0.011

oxide

455.0

542.0

87.0

138.7

165.2

26.5

0.13

0.07

0.002

primary

542.0

612.0

70.0

165.2

186.5

21.3

0.15

0.02

0.004

enriched

678.0

698.6

20.6

206.7

212.9

6.3

0.13

0.10

0.000

ECM-206

oxide

541.8

556.7

14.9

165.1

169.7

4.5

0.80

0.74

0.001

enriched

643.6

701.8

58.2

196.2

213.9

17.7

0.33

0.32

0.001

enriched

739.0

1,135.0

396.0

225.2

345.9

120.7

0.14

0.11

0.001

including

741.0

786.0

45.0

225.9

239.6

13.7

0.32

0.27

0.001

primary

1,135.0

1,515.8

380.8

345.9

462.0

116.1

0.10

0.03

0.001

ECM-207

oxide

339.0

378.0

39.0

103.3

115.2

11.9

0.33

0.26

0.001

oxide

465.3

561.7

96.4

141.8

171.2

29.4

0.13

0.09

0.001

ECM-208

oxide

99.0

273.5

174.5

30.2

83.4

53.2

0.19

0.16

0.006

including

184.0

239.0

55.0

56.1

72.8

16.8

0.32

0.28

0.007

oxide

354.8

455.5

100.7

108.1

138.8

30.7

0.12

0.10

0.001

ECM-209

oxide

175.0

195.0

20.0

53.3

59.4

6.1

0.25

0.22

0.001

oxide

288.0

544.0

256.0

87.8

165.8

78.0

0.51

0.44

0.003

including

361.8

460.0

98.2

110.3

140.2

29.9

0.95

0.87

0.004

ECM-210

enriched

262.4

287.5

25.1

80.0

87.6

7.7

0.56

0.54

0.001

oxide

515.4

577.0

61.6

157.1

175.9

18.8

0.60

0.53

0.004

including

525.7

546.3

20.6

160.2

166.5

6.3

1.08

0.97

0.006

ECM-211

oxide

453.0

479.0

26.0

138.1

146.0

7.9

1.42

1.35

0.001

enriched

499.0

540.4

41.4

152.1

164.7

12.6

0.50

0.46

0.001

including

519.0

540.4

21.4

158.2

164.7

6.5

0.88

0.87

0.001

enriched

811.0

861.5

50.5

247.2

262.6

15.4

0.78

0.77

0.002

including

811.0

817.0

6.0

247.2

249.0

1.8

4.05

3.99

0.003

ECM-212

enriched

646.0

754.3

108.3

196.9

229.9

33.0

0.22

0.22

0.002

including

656.2

687.0

30.8

200.0

209.4

9.4

0.41

0.41

0.002

primary

787.0

1,251.0

464.0

239.9

381.3

141.4

0.14

0.02

0.002

including

1,116.5

1,165.0

48.5

340.3

355.1

14.8

0.24

0.04

0.005

 

  1. Intervals are presented in core length and are drilled with vertical, or steep dip angles.
  2. Drill assays assume a mineralized cut-off grade of 0.1% CuT reflecting the potential for heap leaching of open pit material in the case of Oxide and Enriched and 0.1% CuT, in the case of Primary material, to provide typical average grades. Holes were terminated below the basement fault.
  3. Assay results are not capped. Intercepts are aggregated within geological confines of major mineral zones.
  4. True widths are not known

Table 2: Drilling details

Hole

Easting (m)

Northing (m)

Elevation (ft)

TD (ft)

Azimuth

Dip

ECM-197

421689.7

3643892.2

1348.0

1127.0

0.0

-90.0

ECM-198

421392.3

3644657.0

1360.0

2353.0

0.0

-90.0

ECM-199

422150.8

3644345.0

1364.0

1117.1

0.0

-90.0

ECM-200

422303.0

3644344.0

1367.0

1004.9

0.0

-90.0

ECM-201

421842.0

3643891.0

1350.0

1063.2

0.0

-90.0

ECM-202

422299.0

3644186.0

1350.0

918.6

0.0

-90.0

ECM-203

421994.0

3643889.0

1350.0

876.8

0.0

-90.0

ECM-204

422299.0

3643887.2

1353.0

852.3

0.0

-90.0

ECM-205

422297.5

3644036.1

1357.0

857.0

0.0

-90.0

ECM-206

421539.6

3644198.2

1354.0

1549.0

0.0

-90.0

ECM-207

422453.0

3644037.0

1350.0

928.0

0.0

-90.0

ECM-208

422452.0

3643885.0

1356.0

895.7

0.0

-90.0

ECM-209

421840.8

3643738.5

1350.0

974.5

0.0

-90.0

ECM-210

421688.3

3643739.8

1340.0

945.1

0.0

-90.0

ECM-211

421538.4

3644045.6

1352.0

907.0

0.0

-90.0

ECM-212

421999.5

3644499.0

1366.0

1281.2

0.0

-90.0

 

Note: Drill locations are based on drill plans and hand-held GPS locators and may be adjusted slightly when properly surveyed.

Quality Assurance / Quality Control

Drilling completed on the project between 2020 and 2024 was supervised by on-site ASCU personnel who prepared core samples for assay and implemented a full QA/QC program using blanks, standards, and duplicates to monitor analytical accuracy and precision. The samples were sealed on site and shipped to Skyline Laboratories in Tucson AZ for analysis. Skyline’s sample prep, analytical methodologies, and quality control system complies with global certifications for Quality ISO9001:2008.

Technical aspects of this news release have been reviewed and verified by Allan Schappert – CPG #11758, who is a qualified person as defined by National Instrument 43-101– Standards of Disclosure for Mineral Projects.

Source: https://arizonasonoran.com/



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