{australien_flagge}Drilling at Mestersvig in East Greenland has confirmed the potential for a high-grade lead and zinc ore district in extension of the historic Blyklippen mine to the Sortebjerg project ten kilometers to the south, including other parallel structures to the east. This is how Conico Limited (ASX: CNJ; FRA: BDD) interprets the results now available from ten core samples and 20 rock samples from the 2022 field season. Eight drill holes intersected base metal sulphide minerals in massive quartz veins.
{australien_flagge}Drilling at Mestersvig in East Greenland has confirmed the potential for a high-grade lead and zinc ore district in extension of the historic Blyklippen mine to the Sortebjerg project ten kilometers to the south, including other parallel structures to the east. This is how Conico Limited (ASX: CNJ; FRA: BDD) interprets the results now available from ten core samples and 20 rock samples from the 2022 field season. Eight drill holes intersected base metal sulphide minerals in massive quartz veins.
The style and grade of mineralization encountered in the 2022 drilling is comparable to the Blycliffs Mine where historical production between 1956 and 1962 recovered 545,000 tonnes at 9.3% lead and 9.9% zinc. Drilling in 2022 targeted a fault structure extending 9 km between the Blyklippen and Sortebjerg properties. Assay results for rock chip samples collected during the 2022 season confirm high-grade base metal and silver mineralization at the Holberg, Nuldal and Sortebjerg properties. Samples contain up to 22.5% lead, 3.6% zinc, 3.1% copper and 226 g/t silver.
The Holberg and Nuldal properties contain fault structures that have now been confirmed to host Pb-Zn-Ag±Cu mineralization with quartz veins comparable to that at the historic Blyklippen Mine and Sortebjerg Property. The Holberg and Nuldal faults are located 4 km and 6 km east of and sub-parallel to the Blyklippen-Sortebjerg fault, respectively.
In addition, a review of historical exploration reports from the 1960s and 1970s found high-grade lead and silver in rock samples 38 km south of the historic Blyklippen mine in an area now referred to as Pingo Dal. Sixty-four of 145 historic samples from Pingo Dal have Pb grades greater than 1%, with thirteen samples having Pb grades greater than 50%. Pingo Dal contains similar clastic lithologies and fault structures to the Blycliffs Mine and was explored on a limited basis from the 1950s to 1980s.
Mineralization in drill core and rock chips is similar to that at the Blycliffs Mine and consists of galena and/or sphalerite in quartz veins. Drill hole BKDD005 intersected mineralization grading 7.6% Pb over 0.67 m approximately 1.7 km south of the mine area. High grade mineralization grading 23.75% Zn over 4.5 m was intersected 9 km south of Blyklippen on a previously undrilled section of the Blyklippen-Sortebjerg fault in hole SBDD003. In addition, many of the high grade rock chip samples are on sections of veins or vein systems that have not yet been drill tested.
Managing Director, Guy le Page, commented, “The two drill intercepts from Blyklippen and Sortebjerg, together with the high grade rock chip samples at Holberg, Nuldal and Pingo Dal, indicate an ore district at Mestersvig that extends over 40 km from north to south. The district contains several trench-related faults with quartz-bearing Pb-Zn-Ag±Cu mineralization similar in style to the historic Blyklippen mine, where 545,000 tonnes of ore containing 9.3% lead and 9.9% zinc were mined in the 1950s and 1960s. Significantly, the area has been little touched by modern exploration as there are several undrilled, high priority prospects.”
Despite challenging drilling conditions (Conico ASX news release November 25, 2022), the Company considers the 2022 drilling season a success. Drilling was limited to a small portion of the known vein-bearing fault structures and confirmed that Pb-Zn-Cu-Ag mineralization is present not only in the vicinity of the historic Blycliffe Mine, but also in a larger portion of the project area. High grade mineralization was discovered down-dip of the historic Blycliffe Mine along strike.
Figure 1: Geologic map showing locations of 2022 drilling and historical drilling. The white cross-hatching shows mineralized structures that have not yet been drill tested; the dark cross-hatching shows interpreted extensions of these structures.
Figure 2: Map of Sortebjerg project showing drill holes with significant intercepts (unverified historic intercepts in grey boxes). See Figure 7 for a cross-section through SBDD003.
Figure 3: Site plan of the Mestersvig project showing major prospecting areas and regional geology. Malmbjerg molybdenum deposit with proven and probable resources shown by yellow circle. Oksedal’s estimated barite tonnage is represented by a yellow cross and is based on unverified historical data. The historic Blyklippen Pb-Zn mine is located in the Blyklippen prospect to the north.
The Company believes that the grades encountered in the 2022 drilling and rock chip samples warrant further exploration targeting vein-bearing fault structures. Drilling targets for 2023 include flexure zones and structural flexures in the known mineralized fault-bearing veins on the Blyklippen-Sortebjerg, Nuldal and Holberg veins. The Company’s current understanding of the control of mineralization at the Blyklippen Mine is that the mineralization is structurally controlled.
The Company maintains two portable helicopter drill rigs currently on site for early development of new drill targets. The Company intends to provide the market with further exploration updates prior to the 2023 Greenland field season.
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