Orosur Mining Inc. – Gold Mineralisation Confirmed at Charrascala Target, Colombia
Orosur Mining Inc. – Gold Mineralisation Confirmed at Charrascala Target, Colombia
MEDELLIN, Colombia, June 7, 2018. Orosur Mining Inc. (“Orosur” or “the Company”) (TSX/AIM: OMI), a South
American-focused gold producer , developer and explorer is pleased to announce the final results from the
recently completed gold exploration campaign at its high grade Anzá project in Colombia . Having confirmed
consistent gold mineralisation in the APTA portion of the Anzá project in the first 18 holes of th e exploration
campaign, the final 5 holes of the drill programme were focussed on maiden scout drilling the untested
Charrascala target . Drilling detected the presence of strong gold anomalies , with 4 of the 5 holes drilled
intersecting gold mineralisation and a priority follow up zone has been identified.
HIGHLIGHTS
• Orosur successfully drilled 5 scout diamond drill holes totalling 3,045m at Charrascala, one of the four
untested targets of Anzá;
• The presence of gold in the system has been confirmed within an attractive geological setting for the
mineralization to occur;
• The presence of strong gold anomalies has been detected at Charrascala along an 800m north-south
corridor, including intersects of 3.43 g/t Au and 30.60 g/t Ag over 1.5m and 2.62 g/t Au and 14.30 g/t Ag
over 0.90m;
• Arsenic has been validated as a good gold pathfinder at Charrascala;
• Current drilling has identified an important exploration target in the south of Charrascala; which will be
the priority for follow up drilling;
• Next exploration stages will be focused on continuing the broader exploration of the Anzá project and
more detailed follow up and definition work at APTA.
Ignacio Salazar, CEO of Orosur, said:
“We are very encou raged with the recently completed exploration campaign at APTA and Charrascala in
Colombia. Drill results at APTA have extended the mineralized area at depth and along strike , while still
remaining open. APTA represents only 10% of the land base of the Anzá project, which covers over 200km² .
Additionally, in the last phase of this exploration campaign, the Company successfully tested the Charrascala
target, discovering the presence of gold anomalies along an 800m north-south corridor, including an intersect
of 3.43 g/t Au and 30.60 g/t Ag over 1.5m, as well as identifying a specific target for future drilling . The
Company’s future in Colombia is looking to be off to a promising start.”
In addition to the APTA discovery, the Anzá project contains four additional untested high priority targets with
coincident geochemical and geophysical anomalies (Fig. 1). One of them, Charrascala, is located
approximately 1.5 km to the west of APTA. Charrascala is defined by an extensive coincident gold-in-soil
anomaly and a geophysical anomaly that is approximately 3 km north -south by 1 km east-west and localized
along a likely north-south structure. Surface mapping and sampling combined with interrogation of geophysical
data sets share similar attributes to APTA, which have been validated by recent drilling.
The current exploration campaign started in October 2017 at APTA, where Orosur completed 18 holes
(MAP_54 to MAP_71) totalling 6,314m. Assay results from these holes have been published in separate press
releases dated February 20, 2018 and April 4, 2018. Following the successful results at APTA, Orosur has
now completed the last portion of this campaign with a further five drill holes at Charrascala (Fig. 2) aimed at
testing the Charrascala geochemical anomaly and gaining further insight to the stratigraphy of the sub-sector.
Figure 1 . Coincident geochemical and
geophysical anomalies in the Anzá
project showing five high priority target
areas. Only APTA and Charrascala
have undergone drilling.
Figure 2. Topographic map showing relative
locations of previous and current drill holes. Drill
holes referenced in this press release are
highlighted in Tables 1 and 2. All holes were
assayed at SGS or ALS laboratories in Medellin.
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Table 1. New assay results from the Charrascala drill program, Anzá project
Hole
Number From (m) To (m) Interval (m) Au (g/t) Ag (g/t) Zn (%)
MACH18_01 52.15 53.50 1.35 0.32 7.10 0.04
192.00 194.15 2.15 0.79 22.75 0.81
MACH18_03 193.00 194,00 1.00 1.16 13.10 0.02
490.10 491.02 0.92 1.30 4.20 0.03
503.50 505.80 2.30 0.85 5.88 0.12
540.20 544.00 3.80 1.44 13.69 0.03
Including 541.00 542.50 1.50 3.43 30.60 0.03
MACH18_04 344.70 346.00 1.30 0.62 2.60 0.02
464.00 466.00 2.00 0.30 1.80 -
737.00 738.50 1.50 1.32 0.87 -
MACH18_07 125.80 126.70 0.90 2.62 14.30 0.02
276.20 280.00 3.80 0.44 0.20 -
Including 278.00 280.00 2.00 0.63 0.20 0.01
428.00 429.50 1.50 0.40 0.60 -
Notes:
1. Significant intervals are chosen based on continuity of mineralization and gold grade.
2. All intervals are reported as drilled thicknesses; true thicknesses are estimated to be 65-85% of drilled
thicknesses. Gold grades have been calculated based on weighted averages.
Scout drilling at Charrascala intersected gold occurrences along an 800m north – south structural corridor.
These mineralized intercepts range between 0.90m up to 3.8 m in thickness and are characterized by brittle
veinlet zones with high sulphide content, mostly pyrite , with minor pyrrhotite, chalcopyrite and sphalerite.
Hydrothermal alteration includes intense silicification and propilization which tend to reflect the presence of
structures that controls mineralization. The host rocks are intermediate to mafic volcanic flows, tuff s and
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breccias of the Barroso Formation. The Barroso Formation is part of the igneous -sedimentary sequence that
hosts many of the important mineral deposits of the Cauca Gold Belt, including the Buritica deposit .
Table 2. Hole location and orientation for the new holes assayed to date.
Hole Number Northing
(m) Easting (m) Elevation (m) Azimuth (°) Dip (°) Total Depth
(m)
MACH18_01 694298.46 398660.87 1,226.30 290.00 -50.00 435.00
MACH18_02 694587.80 398398.19 1,201.60 73.00 -60.00 618.20
MACH18_03 694298.57 398661.75 1,227.70 255.00 -60.00 562.50
MACH18_04 694107.26 398683.54 1,208.00 240.00 -50.00 739.30
MACH18_05* 693731.87 398707.78 1,193.50 235.00 -55.00 55.20
MACH18_06* 693731.87 398707.78 1,19.,50 235.00 -60.00 84.50
MACH18_07 693739.85 398698.05 1,185.60 242.00 -57.00 550.00
* Holes MACH18_05 and MACH18-06 were abandoned shortly after drilling due to terrain conditions.
Trace element geochemical analysis from drill core at Charrascala show a positive correlation (r = 0. 60)
between gold (Au) and arsenic (As) values. This correlation provides a useful surface exploration tool that may
be applied at Charrascala and the whole Anz á area to target additional gold mineralization. At Charrascala,
soil sampling has revealed a large arsenic anomaly, with scattered Au values located immediately towards the
south and south-east of the recognized area, close to Guaimarala (Fig.3). The anomaly is associated with a
NW regional trending structure and it is a priority target for a future drilling c ampaign, together with other
arsenic and gold anomalies at APTA.
Figure 3. Left – Gold soil anomalies. Right - Arsenic soil anomalies. Future target for exploration highlighted SE
of Charrascala, SW of APTA.
Based on the interpretation from drilling results, geologic mapping, soil geochemistry and geophysical surveys,
gold mineralization occurs within a geological setting comprising an important structural domain, a well -
developed alteration mineral suite, wit h an important Au -As geochemical correlation, lying within the
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favourable regional Bar roso Formation host rocks of the Cauca Belt, the prolific gold trend of western
Colombia. This combination of key indicators will guide future exploration and drilling within the Anzá Project
area needed to discover and delineate additional new gold deposits similar to APTA and other styles
recognized in the Cauca Belt.
Next steps
Based on the current status of the exploration at the Anzá Project, the Company envisages two immediate
objectives for future exploration campaigns: 1.) a regional surface exploration effort oriented to more fully
understand the implications of the soil geochemical and geophysical anomalies at Anzá and bring them to an
early drilling stage, and 2.) continue and expand the deposit definition drilling at APTA.
Quality Control and Reporting Protocols
This initial drill program recovered HQ/HQ3 core which was logged, split in half for sampling, with the
remainder stored for reference in the secure core facility at Finca El Vergel, Anzá, Antioquia, Colombia.
Samples are delivered to SGS lab and ALS lab both in Medellín, Antioquia, Colombia (ISO/IEC 17025), for
analysis. At the Laboratory, samples are analyzed for gold by traditional fire assay with atomic absorption
finish, with those samples returning >5 g/t gold repeated using a 50g aliquot and gravimetric finish. Samples
are also analyzed for multi-elements including silver, cobalt, copper and zinc by total digestion ICP at the same
labs. Selected samples will also be re-assayed by metallic sieve methods using up to a 350 g aliquot, based
on gold and sulfide content.
Drill program design, Quality Assurance/Quality Control (“QA/QC”) and interpretation of results is performed
by qualified persons em ploying a QA/QC program consistent with NI 43 -101 and industry best practices.
Standards, duplicates, and blanks are added at the lab as well as standards, blanks and duplicates submitted
as unknowns by the Company approximately every ten samples. Approximately 5% of sample pulps are sent
to secondary laboratories for check assay.
Assays are reported as composited intervals using length weighted averages, with highly enriched zones
reported separately. Assays are uncut at this time. Applicable true widths are determined by ongoing
investigation of the continuity and geometry of zones and are typically expected to be 65% to 85% of the
reported core lengths.
Qualified Person
The technical information related to the current assets of Orosur Mining in this announcement has been
reviewed and approved by independent Mining engineer Miguel Fuentealba, a qualified person as defined by
National Instrument 43-101.
About Orosur Mining Inc.
Orosur Mining Inc. (TSX: OMI; AIM: OMI) is a fully integrated gold produce r, developer and explorer focused
on identifying and advancing gold projects in South America. The Company operates the only producing gold
mine in Uruguay (San Gregorio) and has assembled an exploration portfolio of high quality assets in Uruguay,
Chile and Colombia.
For further information, please contact:
Orosur Mining Inc
Ignacio Salazar, Chief Executive Officer
Ryan Cohen, VP Corporate Development
Tel: +1 (778) 373-0100
Cantor Fitzgerald Europe – Nomad & Joint Broker
David Porter/Keith Dowsing
Tel: +44 (0) 20 7894 7000
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Numis Securities Limited – Joint Broker
John Prior / James Black / Paul Gillam
Tel: +44 (0) 20 7260 1000
The information contained within this announcement is deemed by the Company to constitute inside
information as stipulated under the Market Abuse Regulation ("MAR"). Upon the publication of this
announcement via Regulatory Information Service, this inside information is now considered to be in the public
domain. If you have any queries on this, then please contact Ryan Cohen, VP Corporate Development of the
Company (responsible for arranging release of this announcement on behalf of the Company ) on: +1 (778)
373-0100.
Forward Looking Statements
All statements, other than statements of historical fact, contained or incorporated by reference in this news
release, including any information as to the future financial or operating performance of the Company,
constitute "forward -looking statements" wit hin the meaning of certain securities laws, including the "safe
harbour" provisions of the Securities Act (Ontario) and the United States Private Securities Litigation Reform
Act of 1995 and are based on expectations estimates and projections as of the dat e of this news release.
There can be no assurance that such statements will prove to be accurate. Such statements are subject to
significant risks and uncertainties, and actual results and future events could differ materially from those
anticipated in such statements. Forward-looking statements include, without limitation success of exploration
activities; permitting time lines; the failure of plant; equipment or processes to operate as anticipated;
accidents; labour disputes; requirements for additional c apital title disputes or claims and limitations on
insurance coverage. The Company disclaims any intention or obligation to update or revise any forward-
looking statements whether as a result of new information, future events and such forward-looking statements,
except to the extent required by applicable law.