Mr. Paul Kuhn reports
AVRUPA EXTENDS MASSIVE SULFIDE MINERALIZATION AT THE SESMARIAS PROJECT, IBERIAN PYRITE BELT, PORTUGAL
Avrupa Minerals Ltd. has provided an update on progress at the Sesmarias drilling program on the Alvalade licence in the pyrite belt of south Portugal. Drilling is now complete, with six holes drilled, totalling 2,498 metres. The program continues to be highly successful, accomplishing goals of better technical understanding of the Sesmarias mineralizing system and significantly enlarging it. Sampling of the drill core is continuing, with full assay results expected by the end of February.
The drilling program successfully tested a new exploration model and concepts, with the following important results:
Provided a much higher degree of predictability in location of mineralization in the immediate Sesmarias project area as the new model was tested successfully in all six drill holes;
Enlarged the 10 lens from 300-metre strike length to at least 600 metres long, up to 400 metres wide and 25 metres thick (SES026 and SES027);
Discovered the footwall feeder zone stockwork for the 8 lens (SES028);
Intercepted the edge of the 2 lens/horizon (SES025 and SES030);
Intercepted a stockwork-stringer sulphide zone above the 10 lens, providing evidence for a new, fourth lens/horizon, noted for now, as the 26 horizon (SES026);
Showed that mineralization is open to the east up to the bounding fault;
Showed that mineralization is open to the west up to the boundary of the Devonian-age volcano-sedimentary (VS) host rocks for mineralization and the overlying Tertiary-age gravels and semi-consolidated sediments.
This self-financed drilling program is the seventh phase of drilling to be completed by Avrupa Minerals on the Alvalade licence. In addition to further targets in the immediate Sesmarias project area, additional future drilling is anticipated for the Sesmarias/Lousal/Monte da Bela Vista district as well as in other Avrupa-generated target areas with related pyrite-belt-style massive sulphide targets and mineralization. There is potential for further discovery in the pyrite belt mineral system located along the Neves Corvo trend of mineralization on the Alvalade licence.
Note that there are two former-producing mines in the district, located at Lousal and Caveira. Neves Corvo is located about 75 kilometres south and southeast along the strike of the Neves Corvo trend.
The recent work at the Sesmarias project established a coherent picture of multiple, stacked lenses of massive sulphide mineralization, with at least one stockwork feeder zone. Some poorly defined faults exist, which allow for the possibility of deeper targets, as well as potential significant strike extension of the Sesmarias mineralization.
The Sesmarias mineralization, when combined with the existing potential of remaining massive sulphide mineralization at the nearby Lousal mine (located less than six kilometres north of Sesmarias) and the Monte da Bela Vista stockwork mineralization (located a further two kilometres north of Lousal) makes the Sesmarias project a key component in an evolving copper-zinc massive sulphide district on the Alvalade licence.
The company has drilled 30 holes into the target over a strike length of 1,500 metres. Present understanding of the Sesmarias mineral zone suggests potential for further massive sulphide mineralization for at least an additional 800 metres to 1,000 metres north of SES008 and possibly 200 metres to 300 metres to the south of SES021.
The success of the drilling program stemmed from back-away relogging and reinterpretation of 38 Avrupa and pre-Avrupa historic drill holes in the Sesmarias project area. The objective of the relogging campaign was to delineate mineralized target horizons in the general stratigraphy of the volcano-sedimentary (VS) section of rocks that host copper-zinc massive sulphide mineralization throughout the length of the Iberian pyrite belt in Portugal and Spain. The relogging campaign quickly established an increased strike length of the Sesmarias mineralized zone to at least 2.5 kilometres.
The back-away reinterpretation of Sesmarias stratigraphy, utilizing quick logging of the historic drill holes and 3-D modelling of all the new data, allowed the Avrupa team to predict the robustness of the 10 lens, first noted in SES010, then subsequently intersected in SES019, SES021 and SES022. In present-phase drilling, SES026 intersected nearly 30 metres of visual massive sulphide mineralization. SES027, drilled 300 metres north of SES026, intersected stockwork sulphide mineralization and mafic intrusive rocks at the target depth, indicating the possible end of 10 lens in the south sector of the Sesmarias system. For now, strike length of the 10 lens, from SES021 to SES026 is 600 metres.
Previously, the company interpreted the lens to be vertical, based on detailed, close-up logging of drill holes. By relogging the rock units/layers in a back-away package, or rock-unit mode, the Avrupa geological team established a more predictable, flat-lying stratigraphy that has enhanced the potential of large-scale mineralization at Sesmarias. Reinterpretation of geological results in numerous pre-2018/2019 drilling leads Avrupa to believe that some holes were collared on the wrong side of the bounding fault and under (or west of) the 10 lens, thus missing the massive sulphide mineralization.
Furthermore, this back-away review of the core resulted in the determination that the overall orientation of the rock layers is far closer to horizontal than previously understood. Avrupa found evidence of at least three, possibly four, potentially mineralized horizons hosting volcanogenic-massive-sulphide-style copper-zinc sulphide mineralization. Relogging of 38 previous drill holes showed:
VS stratigraphy is not vertically oriented, but relatively horizontal, dipping 30 degrees to 45 degrees to the east and plunging to the north.
A generally north-northwest-trending, steeply oriented fault cuts stratigraphy and mineralization on the east side of the present project area. At this time, all known massive sulphide mineralization lies on the west side of the fault. The east side is generally unexplored (with the exception of SES014 and several pre-Avrupa drill locations), yet remains a strong potential target area for further mineralization. The location of the fault is now much better known after this campaign, though basically still unmapped north of SES008, the northernmost Avrupa drill hole.
Sesmarias mineralization is open to the north for a additional 500 metres to 1,000 metres more than previously assumed. Total strike length of potential target horizons now appears to reach over 2.5 kilometres, an increase from 1.8 kilometres, as previously reported.
Review of previous drilling that did not intersect massive sulphide mineralization at the south end of the Sesmarias target indicates that the holes were placed on the wrong side of the bounding fault (and directed west, or below, of the 10 lens mineralization), which had not been well understood during earlier drilling campaigns. The target to the south appears potentially open, but modified by faulting.
Avrupa Minerals is a growth-oriented junior exploration and development company directed to discovery of mineral deposits using a prospect generator model. The company holds one 100-per-cent-owned, self-financed flagship project -- the Alvalade VMS project. Avrupa focuses its project generation work in politically stable and prospective regions of Europe, including Portugal, Kosovo and Germany.
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