Mr. Brad George reports
OROSUR MINING INC ANNOUNCES COLOMBIA UPDATE
Orosur Mining Inc. has provided an update on the progress of Minera Anza's drilling campaign currently under way at the company's Anza project in Colombia.
Results of further four holes
Assay results for four additional diamond drill holes have been received from the ALS laboratory in Lima, Peru: MAP-079, 080, 081 and 082.
Significant results from MAP-079 and MAP-082 include:
- MAP-079: 23.75 metres at 17.40 grams per tonne gold, 1.84 g/t silver and 0.19 per cent zinc;
- MAP-082: 29.45 m at 2.50 g/t Au, 1.95 g/t Ag and 1.08 per cent Zn;
- MAP-080 and MAP-081 contained no significant intersections.
FULL DRILL RESULTS
Hole No. From To Interval Au Ag Zn
(m) (m) (m) (g/t) (g/t) (%)
MAP-079 252.90 254.90 2.00 2.67 1.22 1.58
including 253.70 254.10 0.40 7.98 1.9 0.91
MAP-079 270.45 294.2 23.75 17.40 1.84 0.19
including 271.00 271.40 0.40 948** 57.7 0.7
including 271.40 271.80 0.40 11.60 1.01 0.02
including 286.40 294.20 7.80 3.25 1.28 0.45
including 288.50 289.60 1.10 8.83 1.80 0.79
including 292.65 294.2 1.55 7.33 1.46 0.66
MAP-079 315.50 320.60 5.10 1.78 17.25 0.09
including 317.40 318.5 1.10 5.56 25.26 0.22
MAP-082 170.10 175.90 5.80 0.93 8.10 1.69
MAP-082 201.90 209.25 7.35 0.68 1.77 0.79
MAP-082 220.60 223.00 2.40 1.54 2.27 2.72
including 222.20 223.00 0.80 3.97 0.78 0.05
MAP-082 227.20 256.65 29.45 2.50 1.95 1.08
including 236.75 237.05 0.30 3.99 1.68 0.56
including 245.65 251.10 5.45 11.42 6.89 4.60
MAP-082 270.50 273.40 2.90 0.57 7.30 5.96
MAP-082 287.90 289.15 1.25 1.64 0.38 0.08
MAP-082 291.85 293.13 1.28 1.06 1.09 1.55
MAP-082 295.70 298.14 2.44 0.85 0.38 0.39
MAP-082 302.77 305.20 2.43 0.45 0.55 0.10
* Intersections are reported as downhole widths. The
company does not yet have sufficient drilling information
to accurately calculate true widths of drill hole
** Initial assay of this sample returned 1,000 g/t Au.
The intersection was resampled and reassayed using
a screen fire assay method to assess and, if necessary,
remove the impact of nugget effect.
All holes were drilled to better define the geological controls upon gold and base metal mineralization that had been identified during previous drilling campaigns but also to extend or to close off such mineralization.
All holes were successful in addressing their objectives and have added important additional information to the understanding of the litho-structural controls upon the mineralization at Apta that has allowed later drilling to be better focused.
The company currently has five diamond drill rigs operating at the Apta prospect, with close to 6,000 m having been completed since November, 2020, across 18 holes, both completed and under way.
Drilling is now focused on a combination of understanding the geological controls upon mineralization, expansion of the mineralized zones and infill drilling to demonstrate continuity. Visually, results continue to appear positive, but the company remains subject to delayed assay results, with over 2,000 samples currently in the laboratory awaiting assay.
It was noted previously that assay turnaround times from the ALS laboratory in Peru had blown out substantially from normal expectations as a result of COVID-19-related staff shortages at the laboratory. This performance had begun to improve in February and March. However, Peru, like most countries in the region, is now experiencing a major third wave of COVID-19, and, as a result, laboratory turnaround times are now well in excess of previous delayed schedules. There is no indication that this will improve in the near term.
Following a lull in February and March, Colombia is now experiencing a very serious third wave of COVID-19, especially in the major cities of Bogota and Medellin, where curfews and lockdowns are now in place. However, mining has been declared an essential industry and as such is permitted to continue, which the company has been able to do via strict COVID-19 operating protocols and an exhaustive testing regime.
Given the success thus far of its operating protocols, the company has taken the decision to expand its regional fieldwork across its wider licence package in order to identify targets for future follow-up.
The licence and application package at Anza contains over 20 kilometres of strike of the Aragon fault, which is thought to control mineralization at Apta, and potentially a similar strike length of the north-south Tocuman fault that may be the primary conduit from the La Cejita intrusive complex to the north of Apta. However, almost all exploration work undertaken thus far by the company and previous operators has been focused on roughly 500 m strike at the Apta prospect with some minor work at Charrascala. Much of the remainder of the licence package remains essentially untouched.
Several regional programs are under way or planned:
- Bulk leach extractable gold (BLEG) sampling programs have been under way across the wider Apta licence and surrounding areas for a few weeks. BLEG is a sampling method capable of detecting extremely low levels of gold and is a broad-scale regional tool for identifying attractive zones for further follow-up.
- Detailed geological mapping and sampling have been continuing across the Apta licence for a few months. The scope of this work is to better understand the local lithology and structures that are controlling mineralization in the Apta area.
- Several field teams have mobilized to the northeast of the project area, outside the Apta licence, which is postulated to host the northeast extension of the Aragon fault, to conduct major mapping and sampling programs.
National Instrument 43-101 data assessment
The company has engaged international mining consulting firm CSA Global (U.K.) to advise in an external expert capacity, with the first task being to carry out an analysis of all previous drilling to ensure that it was completed in a manner consistent with the Canadian standard NI 43-101 and thus amenable to be included in a resource estimate in the future.
The outcome of this work was positive, with CSA noting that all previous drilling was of a high standard and that with some minor modifications would be amenable to be included in a resource estimate in future when that is warranted.
Orosur chief executive officer Brad George commented: "Operationally, in spite of the COVID-19 situation in Colombia, our protocols and the tremendous efforts of our teams in the field have allowed us to continue to operate at near full capacity -- a situation that we will endeavour to continue. However, while our field operations continue at pace, we have no control over external services such as assay laboratories and unfortunately, assay delays are continuing.
"Geologically, however, the picture at Apta is becoming clearer, and we anticipate being able to develop a more detailed understanding of the polymetallic mineralization at Apta once the substantial sample backlog begins to be cleared in coming weeks and months."
About Orosur Mining Inc.
Orosur Mining is a precious metals developer and explorer focused on identifying and advancing gold projects in South America. The company operates in Colombia and Uruguay.
About the Anza project
Anza is a gold exploration project, comprising three exploration licences, four exploration licence applications and several small exploitation permits, totalling 207.5 square kilometres in the prolific Mid-Cauca belt of Colombia.
The Anza project is currently wholly owned by Orosur via its subsidiary, Minera Anza SA.
The project is located 50 km west of Medellin and is easily accessible by all-weather roads and boasts excellent infrastructure including water, power, communications and a large exploration camp.
The Anza project is subject to an exploration agreement with venture option dated Sept. 7, 2018, as announced on Sept. 10, 2018, between Orosur's 100-per-cent subsidiary, Minera Anza SA, and Minera Monte Aguila SAS, a 50/50 joint venture between Newmont Corp. and Agnico Eagle Mines Ltd.
Qualified persons statement
The information in this news release was compiled, reviewed and verified by Mr. George, a qualified person as defined by National Instrument 43-101.
Orosur Mining follows standard operating and quality assurance procedures to ensure that sampling techniques and sample results meet international reporting standards.
Drill core is split in half over widths that vary between 0.3 m and two m, depending upon the geological domain. One-half is kept on site in the Minera Anza core storage facility with the other sent for assay.
Industry-standard quality assurance/quality control protocols are put in place with approximately 20 per cent of total submitted samples being blanks, repeats or certified reference materials (CRMs).
Samples are sent to the Medellin preparation facility of ALS Colombia Ltd., and then to the International Organization for Standardization 9001-certified ALS laboratory in Lima, Peru.
Thirty-gram nominal weight samples are then subject to fire assay and AAS (atomic absorption spectroscopy) analysis for gold with gravimetric refinish for overlimit assays of greater than 10 g/t. ICP-MS (inductively coupled plasma mass spectrometry) ultratrace-level multielement four-acid digest analyses are also undertaken for such elements as silver, copper, lead and zinc.
Gold intersections are reported using a lower cut-off of 0.3 g/t Au over three m.
We seek Safe Harbor.
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