Drilling Dramatically Increases Strike Length of D-Vein with highs to 920 gpt Silver and 4.1% lead-zinc at Columba High-Grade Silver Project
Four of the first six holes (CDH-24-148 to 151) were deliberately drilled at shallow levels to establish dip orientation of the vein before testing the deeper productive zone. Outcrop exposure is limited in the drilling area and initial holes drilled for structure followed by holes CDH-24-152 and 153 that drilled for grade at a significant 200 meter step out from previous intercepts at a comparable depth.
Holes CDH-24-152 and 153 targeted D-Vein at or below the important elevation of 1750 meters above sea level below which, as a rule of thumb at
Holes CDH-24-152 to 153 increase the previously established 450 meter strike length to 650 meters between holes CDH-23-136 to 137 and CDH-24-152 to 153.
Highlights
CDH-24-153
- 435 gpt silver over 11 meters drilled width/3.52 meters estimated true width within 183 gpt silver over 40 meters drilled width/12.96 meters estimated true width
- 920 gpt silver assay high over 1.35 meters drilled width/0.43 meters est. true width
- Very large lateral step out along strike from nearest holes at similar elevation around 1600 to 1675m.
- ~325 meters from CDH-23-145 (22 meters/15.4 meters est. true width of 174 gpt silver with 6 meters/4.2 meters est. true width of 435 gpt silver and 1 meter of 814 gpt silver)1
- ~375 meters from CDH-22-128 (20 meters/13.6 meters est. true width of 136 gpt silver with 2 meters of 520 gpt silver)2
CDH-24-152
- Large step out along strike of previous drilling.
- Tests the upper edge of high grade zone near 1775 meter above seal level
- ~ 200 meters along strike of CDH-23-147 (532 gpt silver over 8 meters drilled/4.96 meters est. true width within 219 gpt silver over 28 meters)3
- ~ 150 meters up dip of CDH-24-153
- 347 gpt silver over 5.6 meters drilled/3.36 meters est. true width within 240 gpt silver over 9.0 meters drilled /5.4 meters est. true width.
- 492 gpt silver over 2.65 meters drilled/1.59 meters est. true width.
The current drilling program is designed to find the strike extent of D-Vein mineralization in preparation of infill drilling and a now fully funded follow up program of 20,000 meters, aimed to delineate a maiden resource expected in late 2024. In addition to the D-Vein, the Company maintains a priority list of new vein targets and known vein extensions all warranting drill testing.
Drill highlights, maps and sections from the project are tabulated on the Company's website at the links below
Click to view the drill plan, long section, and cross sections.
Table 1. D Vein Intercepts from shallow drilling
Hole ID |
From |
To |
Interval |
Est. True |
Silver |
Pb |
Zn% |
Geologic |
CDH-24-148 |
92.00 |
97.00 |
5.00 |
2.50 |
47 |
0.01 |
0.01 |
D-Vein |
CDH-24-149 |
226.50 |
228.00 |
1.50 |
0.75 |
53 |
0.01 |
0.15 |
|
CDH-24-150 |
no |
significant |
intervals |
|
|
|
|
D Vein at 153- |
CDH-24-151 |
123.00 |
148.50 |
22.5 * |
12.00 |
72.5 |
0.02 |
0.05 |
D-Vein |
Includes |
126.00 |
129.00 |
|
|
|
|
|
Cavern |
and |
130.50 |
141.30 |
10.80 |
6.16 |
140 |
0.04 |
0.05 |
D-Vein |
Includes |
136.00 |
137.00 |
1.00 |
0.57 |
223 |
0.03 |
0.06 |
D-Vein |
|
|
|
|
|
|
|
|
|
Table 2. Highlights of Drill holes Targeting D-Vein Below 1750m elevation
Hole ID |
From |
To |
Interval |
Est. True |
Silver |
Pb |
Zn% |
Geologic |
CDH-24-152 |
140.00 |
170.00 |
30.00 |
18.00 |
83 |
0.05 |
0.17 |
D-Vein System |
includes |
148.00 |
157.00 |
9.00 |
5.40 |
240 |
0.14 |
0.42 |
D-Vein System |
includes |
150.40 |
156.00 |
5.60 |
3.36 |
347 |
0.20 |
0.60 |
D-Vein |
Includes |
151.50 |
154.15 |
2.65 |
1.59 |
492 |
0.40 |
1.05 |
D-Vein |
Includes |
152.00 |
153.00 |
1.00 |
0.60 |
539 |
0.30 |
1.60 |
D-Vein |
CDH-24-153 |
275.50 |
316.00 |
40.50 |
12.96 |
183 |
0.01 |
0.22 |
D-Vein System |
includes |
300.00 |
311.00 |
11.00 |
3.52 |
481 |
0.02 |
0.68 |
D-Vein |
includes |
309.00 |
310.35 |
1.35 |
0.43 |
920 |
0.80 |
3.30 |
D-Vein |
As previously mentioned, results discussed herein represent the first series of holes designed as aggressive step outs along the D-Vein structure in a region where the structure is not visible at surface. Holes CDH-24-148 to CDH-24-151 successfully intersected the target at shallow depths, above the projected upper horizon of strong mineralization. These holes will provide invaluable information for subsequent drilling targeting high grade mineralization. Holes CDH-24-152 and CDH-24-153 intersected the D Vein at a deeper levels and silver grades returned were correspondingly higher.
The company has completed over 30,000 meters of diamond drilling in 153 holes at Columba since 2019 and intercepted numerous veins with high silver grades and widths indicating excellent resource potential. Prospective veins on the project are hosted within a volcanic caldera setting, the surface extent of mapped veins measuring roughly 4 kilometres by 3 kilometres. Management believes that Columba may be a newly recognized vein district that is nearly entirely preserved from erosion.
A comprehensive list of drill results completed on the Columba Property since 2019 may be viewed here: Columba Drill Results.
Sampling and QA/QC at Columba
All technical information for the Columba exploration program is obtained and reported under a formal quality assurance and quality control ("QA/QC") program. Samples are taken from core cut in half with a diamond saw under the direction of qualified geologists and engineers. Samples are then labeled, placed in plastic bags, sealed and with interval and sample numbers recorded. Samples are delivered by the Company to ALS Minerals ("ALS") in Chihuahua. The Company inserts blanks, standards and duplicates at regular intervals as follows. On average a blank is inserted every 100 samples beginning at the start of sampling and again when leaving the mineral zone. Standards are inserted when entering the potential mineralized zone and in the middle of them, on average one in every 25 samples is a standard. Duplicates are taken in the mineralized intervals at an average 2 duplicates for each hole.
The samples are dried, crushed and pulverized with the pulps being sent airfreight for analysis by ALS in
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