Outcrop Gold Reports Results from and Status of Cauca Project Colombia
Outcrop Gold Reports Results from and Status of Cauca
Project Colombia
Vancouver, British Columbia--(Newsfile Corp. - November 19, 2019) - Outcrop Gold Corp. (
TSXV: OCG
) ("
Outcrop
" or the
"
Company
") is pleased to provide an update on its Cauca project. Exploration work includes roadcut and trench sampling,
mapping, reconnaissance prospecting, and local systematic channel sampling along road-cuts in areas with observed relatively
higher epithermal vein density.
Importantly, cross-sectional and 3D model work support the concept that numerous currently undefined and unmodeled veins
have the potential to add significant gold-silver-copper values to the La Custodia deposit.
The work indicates where future drilling should be focused. Importantly work provides a best orientation of core-holes to test a
large epithermal vein system that overprints porphyry-style mineralization.
Exploration Work Objectives
The initial program was designed to understand the prevalent character and orientation of epithermal gold veins, and from that
information design future drill tests in the designed pit.
In the designed pit area, there are numerous historic core-hole intercepts
of epithermal veins and veinlet zones. Sometimes multiple vein zones occur in a single core-hole. This is interpreted as parallel
zones with possibly a predictable average spacing.
Surface work confirms a predominant northwest strike and sub vertical dips of the vein zones. This prevalent vein orientation can
be used to begin to project vein segments based on existing intercepts in sections and a 3D model.
With a dominant vein orientation, the Company has initiated preliminary projection and modeling of the veins as well as a better
estimate of vein zone true thickness.
Because historic drilling is sparse, and wide-spread and rarely optimally oriented, Outcrop
now can orient future drilling and have a higher probability of success in intercepting high-grade epithermal vein zones.
Significant mechanical trenching and drilling from scout level to delineation levels will be required to evaluate the epithermal
veins. Drilling should first test the core area of higher-grade porphyry mineralization.
Note that all references to non-compliant NI 43101 block models, block model grades and designed pit shell referenced in the
text and figures below are as reported extensively in Outcrop Gold news releases of June 13
th
, 2018 and April 25
th
, 2019.
General Objectives
1
.
Verify the potential that if numerous currently unprojected higher-grade epithermal vein zones in historic and future drilling
are accurately modelled, that areas of 0.4 to 0.6 g Au Eq/t within Company built grade models in the designed pit shell
could be enhanced by a factor of two or more.
2
.
Advance two identified targets north of La Custodia deposit that have equal potential but are poorly explored.
3
.
Attract a funding partner or strategic investment to advance and drill the Cauca project.
Cauca Geologic and Exploration Models:
The geologic model for La Custodia zone at Cauca is numerous bi-modal cross-cutting epithermal gold veins and sheeted vein
and veinlet zones overprinting a low-grade copper-gold porphyry. Reconnaissance mapping (Figure 2) suggests that the La
Custodia epithermal vein system is 2km wide and extends through and beyond the borders of porphyry-mineralization in all
directions.
Outcrop relogging of critical core-holes and subsequent re-evaluation of historic core logs indicate that within thirty 100 to 200 m
spaced core holes in the La Custodia zone, there are eighty-six epithermal vein-intercepts, with thirty-five of those intercepts
over 3 g Au/t ranging from 3.25 g Au/t to 1095 g Au/t. in the same intercepts, silver values are up to 100 g Ag/t and copper
values up to 2%.
For the thirty-five intercepts above, the weighted average grade is 8.1 g Au/t over 1.76 m after cutting the highest 1095 g Au/t
intercept to 36 g Au/t.
In addition to the thirty-five intercepts greater than 3 g Au/t, another fifty-one epithermal vein intercepts
range from 1.7 g Au/t to 2.95 g au/t over 0.10 m to 2m.
The company cannot accurately determine true thicknesses of vein zones in core holes. But Outcrop surface mapping and
trenching shows vein zones range from 0.15m to 2m in true width. The vein zones can be discrete veins or breccia veins, but
sheeted veinlet packages of variable width are more common.
The previous operator of the Cauca Project provided a non NI43-101 compliant resource estimate for La Custodia of
31,000,000 tonnes at 0.506 g Au Eq/t in an optimized open-pit design that used 0.480 g Au/t cutoff. Cutoffs used gold only to
create a greater than 0.300 g Au/t grade shell before block modeling.
Outcrop believes this work is of enough quality for the current stage of exploration but will need to be verified ultimately by a
qualified third party before being be used for more advanced evaluations. Figure 5 shows typical long intercepts of low-grade
porphyry mineralization within 20m by 20m by 10m grade blocks.
Sampling and Mapping
Sampling and mapping included detailed roadcut mapping and channel sampling and limited manually excavated trenching.
Company exploration works continues to advance a better understanding of the geometry and density of epithermal vein zones
which are the key to understanding mineralization on the Cauca project.
Mapping by the Company of roadcuts (Figure 3) shows local high vein density in dacite porphyry. One area mapped shows a
25m interval that contains 20 vein zones.
The La Custodia deposit is within a large cohesive gold in soils anomaly (Figure 1) that measures 2.5km by 1.5km. The soils
are historic data compiled and contoured by the Company. Other gold in soil anomalies provide the Hueco Hondo and La
Esperanza targets. Epithermal veins as wide as 0.5m outcrop in the La Esperanza whereas they do not outcrop in La Custodia.
Hueco Hondo has poorly exposed epithermal vein that are inferred to represent a 0.75km wide vein system- probably trending
predominantly northwest like La Custodia. The Company believes that La Esperanza and Hueco Hondo have similar potential to
La Custodia and that they have seen very little systematic exploration.
Figure 1:
The La Custodia target has a cohesive gold in soils anomaly that measures 2.5km by 1.5km.
To view an enhanced version of Figure 1, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_001full.jpg
Figure 2
: Mapping clearly indicates predominately northwest trending veins as a dominant vein direction. (for clarity veins not
illustrated in the La Custodia drill pattern).
To view an enhanced version of Figure 2, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_002full.jpg
Figure 3:
Local high-density vein zones. These vein zones are not in the core area - but it can be inferred that high-grade vein
zones in the core of La Custodia deposit have similar characteristics.
To view an enhanced version of Figure 3, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_003full.jpg
Figure 4
: A trench example with a complex vein zone with a larger northeast vein cross-cutting a northwest trending vein zone
that measures 3m.
To view an enhanced version of Figure 4, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_004full.jpg
Although limited and not optimally sited (due to surface access) trenching does indicate vein and veinlet zones commonly
contain much higher values than surrounding porphyry-mineralization. Several trench samples were over 2 g Au/t and up to 6.49
g Au/t over 0.5m. This sampling in general conforms to epithermal intercept assays in the central La Custodia area.
Reconnaissance mapping, prospecting and data compilations demonstrate two significant features that support the Company
exploration model. On a deposit-scale several northwest trending, high-density vein zones (sectors 1 -3 in Figure 6) were
identified.
Local characterization channel samples in these zones demonstrate higher values in vein zones than in porphyry-style
mineralization (Table 2). Assays from vein zones are as high as 9.33 g Au/t over 0.3m. On a larger gold-system scale,
reconnaissance mapping, data compilations, and lineament studies show (Figure 7) eleven inferred, northwest-trending higher
density vein zones. Six of the eleven zones extend through the designed pit and may help focus future drilling both in the
designed pit and block model, and general exploration of the greater La Custodia are, and the Cauca project.
These zones
extend up to 1.8km and appear to have a regular and predictable spacing; they show, that at all scales, northwest is a key vein
trend. This information gained by the Company is a key to planning efficient future drilling.
Figure 5:
Manual trenches were only local "spot checks" of veins. Mechanically excavated trenches are needed in subsequent
programs.
To view an enhanced version of Figure 5, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_005full.jpg
Table 1.
Although limited and not optimally sited, trenching does indicate vein and veinlet zones that locally show higher values
in veins.
To view an enhanced version of Table 1, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_006full.jpg
Figure 6:
Reconnaissance mapped and projected deposit-scale higher density vein zones ("sectors" 1 though 3 correlating with
Table 2. Composited drill-intercepts for La Custodia designed pit (delineated in black) and near pit are also illustrated. These
drill-hole composites purposely correlate with 20m x 20m x 10m block model compositing.
To view an enhanced version of Figure 6, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_007full.jpg
Table 2
: Spot sampling in sectors with high density vein zones. The sector locations are on Figure 5 immediately above.
To view an enhanced version of Table 2, please visit:
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Figure 7:
Showing vein zone trends indicated by reconnaissance prospecting and lineament and mapping studies.
To view an enhanced version of Figure 7, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_009full.jpg
Figure 8:
g Au Eq/t block model (without vein zone projections) and design pit trace. Pit trace is 1km by 0.8km.
To view an enhanced version of Figure 8, please visit:
https://orders.newsfilecorp.com/files/6343/49859_873215c694c70a13_010full.jpg
Figure 8a
To view an enhanced version of Figure 8a, please visit:
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