The Berrio Gold Project is situated in the southern part of the prolific Segovia Gold Belt and is characterised by a number of artisanal mining operations. The project is 35km from the Magdalena River which is navigable to the Caribbean Sea and has excellent infrastructure in place including hydro power, water supply, sealed roads and telecommunications coverage.
The local geology has been intruded and is bounded by a fertile granodiorite – a classical and known geological setting for gold deposits. Ongoing geological mapping suggests a series of gold-bearing anastomosing veins comprised mainly of quartz and pyrite within a wider series of mineralised shear zone. A systematic approach incorporating modern exploration could unveil a high grade gold system that features multiple parallel mineralised zones that persist at depth. There is an increase in sulphides with depth suggesting grade improvement with depth. Pacifico is targeting substantial ounces from multiple mineralised veins persisting to depth.
Location map of Berrio Project in the Segovia Belt
In early 2015, Pacifico entered into a binding agreement with AngloGold Ashanti Colombia S.A. (“Anglo”) to acquire a 100% interest in a suite of tenements and tenement applications (~14,300 hectares) contiguous to Pacifico’s existing Berrio Gold Project (~62 hectares). During 2014 and early 2015, Pacifico assessed the prospectivity of the existing 62 hectares and it became apparent that prospective mineralisation extended outside the boundaries. Hence, the Board implemented a strategy to acquire adjacent titles and in early 2015 achieved this by acquiring ~14,300 hectares from Anglo.
Berrio Gold Project location map
Phase one reconnaissance confirmed the Board’s expectation that mineralisation continues into the newly acquired ground. Mapping confirmed that the extended Berrio Project contains a several fold increase of the highly prospective Berrio Sediment package as well as other prospective terrains including the prolific Segovia Batholith (see ASX announcement dated 18 February 2015 for further details). Mapping also confirmed the faulted contact, considered by Pacifico to be highly prospective for gold, silver and base metals, lies west of the existing 62 hectares. Company geologists traced the faulted contact for 6.2km into the extended project area. Further, regional geological maps published by the Geological Survey of Colombia suggest that the contact continues south into the extended project area for a further 7.8km. Assays from selective grab samples included:
- 240.11 g/t Au, 1,178 g/t Ag and 2.02% Zn
- 94.97 g/t Au, 215 g/t Ag and 4.95 % Pb
- 88.92 g/t Au and 761 g/t Ag
- 46.88 g/t Au, 166 g/t Ag and 1.12% Zn
- 11.76 g/t Au, 343 g/t Ag, 13.58 % Pb and 24.19 % Zn
Recent sampling highlights at Berrio Gold Project
In August 2014, Pacifico completed its maiden drilling program at Berrio comprised of 10 diamond drill holes totalling 1,936 metres (see ASX announcements dated 4 August and 14 August, 2014). This program was designed to test the distribution and grade of mineralisation beneath high grade gold zones defined in underground channel sampling (see ASX announcements dated 25 February and 20 May, 2014).
|Hole ID||From||Assay Results|
16.3m @ 11.2 g/t Au incl. 5.7m @ 29.1 g/t Au (containing 1.3m @ 96.3 g/t Au and 1m @ 20.1 g/t Au) and 2m @ 4.7 g/t Au
|BE14-002||203m||12.9m @ 4.1 g/t Au incl. 3.3m @ 10.9 g/t Au|
|BE14-008||28m||4.1m @ 13.6 g/t Au incl. 1.1m @ 47.7 g/t Au|
8.4m @ 3.8 g/t Au incl. 3.2m @ 8.0 g/t Au (containing 0.2m @ 68 g/t Au) and 1m @ 5.1 g/t Au
||116m||7m @ 5.6 g/t Au incl. 1m @ 16.9 g/t Au and 2m @ 9.5 g/t Au|
|BE14-009||233m||5.1m @ 5.0 g/t Au incl. 1.9m @ 8.0 g/t Au and 1m @ 7.6 g/t Au|
|BE14-008||62m||5.1m @ 4.7 g/t Au incl. 4.1m @ 5.7 g/t Au|
|BE14-007||212m||1.1m @ 8.7 g/t Au|
|BE14-004||82m||2m @ 5.4 g/t Au incl. 1m @ 8.6 g/t Au|
|BE14-009||188m||5.3m @ 2.5 g/t Au incl. 1.0m @ 4.2 g/t Au|
|BE14-009||133m||4.9m @ 2.5 g/t Au incl. 0.9m @ 8.7 g/t Au|
|BE14-002||82m||4.9m @ 1.8 g/t Au incl. 1.5m @ 4.6 g/t Au|
|BE14-005||230m||9.2m @ 1.5 g/t Au incl. 2.2m @ 4.8 g/t Au|
|BE14-006||129m||9m @ 1.6 g/t Au incl. 1m @ 4.1 g/t Au|
Pacifico commenced further drilling in October 2014. The program was designed to extend known mineralisation encountered during the maiden drilling campaign (see ASX announcements dated 4 August and 14 August, 2014 for further details) and to test new exploration targets delineated during recent induced polarisation and soil sampling programs. Phase two diamond drilling has consisted of 15 diamond drill holes from 9 platforms totalling ~1,500m. The drilling program targeted along strike and down-dip extensions of auriferous mineralisation hosted in sub-vertical north-south trending shear zones (see ASX announcement dated 18 December 2014 for further details).
Results confirm the widespread distribution of high grade gold mineralisation (>10 g/t Au) distributed mainly in a series of near vertical shears and hosted by quartz-sulphide vein stockwork and breccia. Drilling also suggests a close relationship between gold mineralisation and more competent sandstone units that characterise parts of the host sedimentary sequence. In total, 12 intersections greater than 0.5m recorded greater than 10g/t Au with grades ranging up to 20.6g/t Au.
|Hole ID||From||Assay Results|
6.7m @ 10.2g/t Au incl 1.2m @ 17.3g/t Au, 0.8m @ 16.5g/t Au and 0.7m @ 15.4g/t Au
|BE14-015||53m||3.8m @ 9.8g/t Au incl 0.9m @ 19.6g/t Au|
|BE14-022||28m||2.9m @ 8.8g/t Au incl 1.6m @ 15.2g/t Au|
2.3m @ 8.4g/t Au incl 0.9m @ 20.6g/t Au
|BE14-020||147m||3.3m @ 7.2g/t Au incl 2m @ 11.4g/t Au|
|BE14-011||96m||2.7m @ 5.9g/t Au incl 0.7m @ 18.3g/t Au|
|BE14-023||105m||2.6m @ 5.7g/t Au incl 1.2m @ 11.1g/t Au|
|BE14-013||97m||3m @ 4.4g/t Au incl 1.5m @ 7.2g/t Au|
|BE14-016||43m||6.3m @ 3.1g/t Au incl 0.9m @ 10.74g/t Au|
Typical ore mineralogy at Berrio with pyrite and quartz veins and stringers
Stockwork mineralisation in graphitic schist. Photo approximately 1 metre across
In late 2016, two zones were explored:
- A 14-20 m shear zone, within the Berrio Sediments, recorded in a third-party licence adjoining the Pacifico licences. This shear zone is exploited by gold miners and is observed to host disjointed quartz veins and crystalline pyrite. This shear zone projects into Pacifico’s licences and offers several hundred meters’ exploration potential.
- In the Segovia Batholith, west of the Berrio Sediments and Nus Fault, continuous quartz veins, of varying orientations, are exploited at the neighbouring Argentina silver and gold mine. These structures project into Pacifico’s licences and offer over 700 m of exploration potential.
Channel sampling from an artisanal mine (Area T) obtained values of up to 17.6g/t Au and 243g/t Ag over 0.6m.
Mineralised structure was identified in the Segovia Batholith. Gold in soil anomoly extends >200m aross three soil sample lines (Area N). Values of 6.3 to 74.9g/t Au was obtained during reconnaissance geological mapping and rock chip sampling in the southern tenements.
Berrio Tenements - areas of recent exploration
- Complete reconnaissance work along Nus Fault in southerin tenements exploring for high grade gold shoots and lenses.
- Reconnaissance exploration within western application areas for stockwork vein gold systems (Gramalote style) in granodiorite batholiths
- Complete exploration in Areas T and N to define drill targets
- Diamond drilling during 2016 programme obtained values of up to 0.4m of 16.9g/t Au
- Channel sampling of mineralisation at the contact between the Segovia Batholith and Berrio Sediments 46m below surface in an artisanal mine (Area T) obtained values of up to 17.6g/t Au and 243g/t Ag over 0.6m in the same zone
- Scope for thicker, high grade shoots within this mineralised fault structure
Area T - Geology and drill hole traces
Artisanal Mine in Area T, 46m below surface. A) South face of the current advance. B) North face of the current operating level.