Excelsior Mining Corp. (TSX: MIN) (PFSE: 3XS) (OTCQX: EXMGF) is pleased to announce additional assay results from the infill drill program on the Johnson Camp mine pits located in Cochise County, southeastern Arizona and provide an operations update.
Drill Program
Due to successful drilling in the NE corner of Burro pit, additional holes were added and those with assays returned are reported below. The improved results will allow the Company to develop a mine plan that focusses on this new, higher-grade, mineralized zone. Permitting of the new leach pad to restart operations is in progress, however the additional drilling and metallurgical testing will push the Company’s goal of restarting mining operations at JCM into 2023.
“The recent infill drill results from the Burro pit are better than expected compared to existing data. Zones of significant thickness and grade have been intersected. We look forward to getting all the results back, completing the geological and resource interpretations and design optimization, with our goal of restarting the JCM open pits as soon as possible,” commented Roland Goodgame, Senior Vice President Business Development.
The drilling program is now completed with a total of 43 diamond holes being drilled. Six holes are still awaiting assays. Sequential copper assays for the remaining 37 holes have an average leaching potential exceeding 68% (excludes intervals that contain sulfide mineralization). Assay highlights are included in Table 1 below. Full assays are included in Table 2.
Table 1
Hole ID | From (Ft) | To (Ft) | Interval (Ft) | True Thickness (Ft) | TCu% | Type | Avg. Leaching Potential % |
EBD-21 | 170 | 187 | 17 | 13.0 | 2.05 | S&T | 27 % |
EBD-22 | 325 | 573 | 248 | 190.0 | 0.34 | O&T | 74 % |
EBD-24 | 223 | 638 | 415 | 383.9 | 0.42 | O&T&S | 69 % |
EBD-25 | 247 | 733 | 486 | 486.0 | 0.42 | O&T | 74 % |
EBD-26 | 176.5 | 182 | 5.5 | 4.2 | 4.03 | S | 11 % |
EBD-27 | 160 | 550 | 390 | 372.5 | 0.4 | O&T | 70 % |
EBD-33 | 410 | 600 | 190 | 145.5 | 0.53 | O&T | 89 % |
EBD-34 | 395 | 600 | 205 | 157.0 | 0.36 | O&T | 77 % |
EBD-35 | 397 | 547 | 150 | 114.9 | 0.42 | T | 91 % |
Mineralized Zone: O = Oxide, T = Transition, S = Sulfide. TCu% = Total Copper % |
The leaching potential of copper mineralization is defined as acid soluble copper plus sodium cyanide soluble copper divided by total copper.
All samples are prepared from manually split or sawn PQ or HQ core sections on site in Arizona. Drill core samples are then sent to Skyline Assayers & Laboratories in Tucson, Arizona for Total Copper and Sequential Copper analyses. Standards, blanks, and duplicate assays are included at regular intervals in each sample batch submitted from the field as part of an ongoing Quality Assurance/Quality Control Program. Pulps and sample rejects are stored by Excelsior for future reference.
Table 2
Hole ID | From (Ft) | To (Ft) | Interval (Ft) | True Thickness (Ft) | TCu% | Type | Avg. Leaching Potential % |
EBD-09 | 15 | 25 | 10 | 7.7 | 0.12 | O | 92 % |
75 | 175 | 100 | 76.6 | 0.22 | O&S | 41 % | |
EBD-17 | 128 | 158 | 30 | 23.0 | 0.16 | T&S | 31 % |
208 | 330 | 122 | 93.5 | 0.3 | S&T&O | 27 % | |
EBD-18 | 80 | 90 | 10 | 9.9 | 0.25 | O | 92 % |
160 | 290 | 130 | 128.1 | 0.28 | T&S | 61 % | |
EBD-19 | 0 | 80 | 80 | 61.3 | 0.24 | O | 71 % |
80 | 150 | 70 | 53.6 | 0.24 | O&S | 29 % | |
EBD-20 | 190 | 230 | 40 | 30.6 | 0.57 | S | 14 % |
250 | 260 | 10 | 7.7 | 0.19 | T&S | 42 % | |
270 | 290 | 20 | 15.3 | 0.16 | O | 75 % | |
EBD-21 | 40 | 130 | 90 | 68.9 | 0.2 | O | 70 % |
170 | 187 | 17 | 13.0 | 2.05 | S&T | 27 % | |
EBD-22 | 30 | 110 | 80 | 61.3 | 0.33 | O | 73 % |
130 | 204 | 74 | 56.7 | 0.36 | O&T | 58 % | |
244 | 254 | 10 | 7.7 | 0.21 | T | 48 % | |
264 | 274 | 10 | 7.7 | 0.13 | O&T | 77 % | |
284 | 295 | 11 | 8.4 | 0.18 | O&T | 89 % | |
325 | 573 | 248 | 190.0 | 0.34 | O&T | 74 % | |
EBD-24 | 55 | 65 | 10 | 9.3 | 0.17 | O | 76 % |
115 | 183 | 68 | 62.9 | 0.18 | O | 72 % | |
223 | 638 | 415 | 383.9 | 0.42 | O&T&S | 69 % | |
EBD-25 | 113 | 133 | 20 | 20.0 | 0.22 | O | 84 % |
167 | 177 | 10 | 10.0 | 0.17 | O | 84 % | |
247 | 733 | 486 | 486.0 | 0.42 | O&T | 74 % | |
EBD-26 | 90 | 100 | 10 | 7.7 | 0.16 | O | 94 % |
120 | 130 | 10 | 7.7 | 0.24 | O | 88 % | |
176.5 | 182 | 5.5 | 4.2 | 4.03 | S | 11 % | |
190 | 200 | 10 | 7.7 | 0.66 | O&T | 77 % | |
230 | 283.5 | 53.5 | 41.0 | 0.24 | O | 75 % | |
EBD-27 | 20 | 80 | 60 | 57.3 | 0.63 | O | 95 % |
160 | 550 | 390 | 372.5 | 0.4 | O&T | 70 % | |
EBD-29 | 110 | 120 | 10 | 7.7 | 0.17 | O | 82 % |
147 | 210 | 63 | 48.3 | 0.36 | O | 56 % | |
240 | 280 | 40 | 30.6 | 0.21 | T | 71 % | |
EBD-31 | 40 | 100 | 60 | 46.0 | 0.4 | O | 50 % |
140 | 170 | 30 | 23.0 | 0.28 | O | 54 % | |
EBD-32 | 30 | 50 | 20 | 20.0 | 0.28 | O | 85 % |
68 | 78 | 10 | 10.0 | 0.17 | O | 88 % | |
98 | 108 | 10 | 10.0 | 0.46 | O | 63 % | |
128 | 138 | 10 | 10.0 | 0.18 | O | 63 % | |
158 | 173 | 15 | 15.0 | 0.24 | O | 79 % | |
EBD-32A | 24 | 44 | 20 | 20.0 | 0.34 | O | 85 % |
94 | 104 | 10 | 10.0 | 0.18 | O | 61 % | |
124 | 162 | 38 | 38.0 | 0.43 | O | 44 % | |
EBD-33 | 60 | 70 | 10 | 7.7 | 0.42 | O | 95 % |
100 | 110 | 10 | 7.7 | 0.12 | O | 97 % | |
200 | 235 | 35 | 26.8 | 0.39 | O | 59 % | |
255 | 265 | 10 | 7.7 | 0.38 | O | 28 % | |
275 | 285 | 10 | 7.7 | 0.68 | O | 76 % | |
295 | 325 | 30 | 23.0 | 0.33 | O | 62 % | |
345 | 355 | 10 | 7.7 | 0.2 | O&T | 61 % | |
385 | 402 | 17 | 13.0 | 0.56 | O | 59 % | |
410 | 600 | 190 | 145.5 | 0.53 | O&T | 89 % | |
EBD-34 | 130 | 140 | 10 | 7.7 | 0.37 | O | 83 % |
150 | 165.5 | 15.5 | 11.9 | 0.45 | O | 71 % | |
305 | 325 | 20 | 15.3 | 0.37 | O | 42 % | |
395 | 600 | 205 | 157.0 | 0.36 | O&T | 77 % | |
EBD-35 | 35 | 45 | 10 | 7.7 | 0.14 | O | 76 % |
295 | 315 | 20 | 15.3 | 0.32 | O&T | 37 % | |
397 | 547 | 150 | 114.9 | 0.42 | T | 91 % | |
EBD-36 | 13 | 30 | 17 | 13.0 | 0.63 | O | 90 % |
76 | 90 | 14 | 10.7 | 0.65 | O | 46 % | |
100 | 120 | 20 | 15.3 | 0.32 | O | 39 % | |
140 | 150 | 10 | 7.7 | 0.46 | O | 40 % | |
160 | 170 | 10 | 7.7 | 0.32 | O | 68 % | |
250 | 260 | 10 | 7.7 | 0.17 | O&T | 72 % | |
336 | 350 | 14 | 10.7 | 0.19 | O&T | 74 % | |
EBD-37 | 10 | 190 | 180 | 137.9 | 0.27 | O&T | 78 % |
Mineralized Zone: O = Oxide, T = Transition, S = Sulfide. |
The Johnson Camp Mine has historically been an open pit, heap leach operation since Cyprus Minerals opened the property in the 1970’s. The operation includes two open pits, a two-stage crushing-agglomerating circuit, a fully functioning SX-EW plant capable of producing 25 million pounds of cathode copper per year, a complete set of PLS and raffinate ponds, and full infrastructure (ancillary facilities, access, power, water, and communications).
Operations Update
Excelsior is also providing an update on operations and future plans. Excelsior’s near-term focus is on the following:
QUALIFIED PERSON
Excelsior’s exploration work on the Johnson Camp mine is supervised by Stephen Twyerould, Fellow of AUSIMM, President and CEO of Excelsior and a Qualified Person as defined by NI 43-101. Mr. Twyerould has reviewed and is responsible for the technical information contained in this news release. Mr. Twyerould has verified the data disclosed in this news release, including sampling, analytical and test data underlying the information disclosed in this news release. Mr. Twyerould has verified that the results were accurate from the official assay certificates provided to Excelsior.
ABOUT EXCELSIOR MINING
Excelsior “The Copper Solution Company” is a mineral exploration and production company that owns and operates the Gunnison Copper Project in Cochise County, Arizona. The project is a low cost, environmentally friendly in-situ recovery copper extraction project that is permitted to 125 million pounds per year of copper cathode production. Excelsior also owns the past producing Johnson Camp Mine and a portfolio of exploration projects, including the Peabody Sill and the Strong and Harris deposits.
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