Coro Intersects Substantial Copper Mineralization in First 8 Holes of Marimaca Drilling

April 28, 2016

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VANCOUVER, BRITISH COLUMBIA–(Marketwired – April 28, 2016) – Coro Mining Corp. (“Coro” or the “Company”) (TSX:COP) is pleased to announce the results of the first 8 holes from a recently completed 16 hole, 2680m reverse circulation (RC) drilling program at its Marimaca copper project, located 22km E of the port of Mejillones in the II Region of Chile. (Fig. 1)

The Marimaca property contains a number of N-S trending, ~60°E dipping, broad shear zones, cross cut by later NE-SW oriented sub vertical feeder structures, all hosted by Jurassic age intrusive rocks. The intersection of these structures has produced wide NW-SE oriented zones of eastward dipping mineralization that have been exploited from a series of open cuts and small underground workings by artisanal miners. Coro’s program is the first ever drilling carried out on the property and tested the larger West Zone and a smaller East Zone; other zones of mineralization as defined by old workings, anomalous rock geochemistry and outcropping copper oxides remain to be tested.

Drilling Results

The West Zone is defined by a series of open cuts extending over ~700m length and was tested by holes MAR-02, -03, -04, and -08. All four holes intersected broad zones of good grade, mostly oxide mineralization over significant widths as shown in Table 1. Results are pending for the remaining 8 holes, MAR-09 to MAR-16, which were all drilled in the West Zone.

Table 1: Marimaca West Zone Intersections
Zone Hole TD From To m %CuT Type
2 18 16 0.37
MAR-02 150m Oxide
64 144 80 0.72
0 158 158 0.69 Oxide
MAR-03 200m 158 190 32 1.42 Enriched
West 190 200 10 0.70 Mixed
MAR-04 200m 0 200 200 0.71 Oxide
2 94 92 0.42
MAR-08 150m Oxide
130 150 20 0.60

The East Zone is defined by geological mapping, old workings and anomalous rock geochemistry over a minimum length of ~200m and was tested by holes MAR-01, -05, -06 and -07. All four holes intersected good grade oxide, mixed and secondary sulphide (enriched) mineralization over significant widths as shown in Table 2.

Table 2: Marimaca East Zone Intersections
Zone Hole TD From To m %CuT Type
10 40 30 0.91 Oxide
MAR-01 140m
92 108 16 0.34 Mixed
0 28 28 0.71
28 34 6 Stope
34 48 14 0.56 Oxide
48 52 4 Stope
MAR-05 200m
52 62 10 0.58
70 94 24 0.41 Mixed
94 106 12 0.34
East Enriched
122 168 46 0.77
14 54 40 0.57 Oxide
54 88 34 0.24 Mixed
MAR-06 200m
94 180 86 0.39 Enriched
180 196 16 0.69 Mixed
40 104 64 0.70 Oxide
MAR-07 210m 104 184 80 0.49 Mixed
184 210 26 0.20 Enriched

Alan Stephens, President and CEO of Coro commented, “We are delighted by these initial results from our drilling program at Marimaca with many holes bottoming in mineralization, and confirming the potential for a sizeable leachable copper deposit in a great location. We look forward to announcing the results from the second batch of drill holes, together with a fuller description of the mineralization, shortly.”

Sampling and Assay Protocol

True widths cannot be determined with the information available at this time. Coro RC holes were sampled on a 2 m continuous basis, with dry samples riffle split on site and one quarter sent to the Geolaquim laboratory in Copiapo, Chile by Coro personnel for preparation and assaying. A second quarter was stored on site for reference. Samples were prepared using the following standard protocol: drying, crushing to better than 80% passing -10#, homogenizing, splitting and pulverizing a 400 g subsample to 95% passing -150#. All holes were assayed for CuT (total copper) and CuS (acid soluble copper) by AAS. A full QA/QC program, involving insertion of appropriate blanks, standards and duplicates was employed with acceptable results.

Sergio Rivera, Vice President of Exploration, Coro Mining Corp, a geologist with more than 32 years of experience and a member of the Colegio de Geologos de Chile and of the Instituto de Ingenieros de Minas de Chile, was responsible for the design and execution of the exploration program and is the Qualified Person for the purposes of NI 43 -101. Alan Stephens, FIMMM, President and CEO, of Coro Mining Corp, a geologist with more than 39 years of experience, and a Qualified Person for the purposes of NI 43-101, is responsible for the contents of this news release.

About Marimaca

Marimaca is an early stage copper oxide prospect located in the Coastal Range belt of Mesozoic copper deposits of northern Chile. Other significant currently or recently producing deposits in the belt include Mantos Blancos, Michilla, Ivan and Mantos de la Luna.

Coro has the right to earn a 75% interest in the property as follows;

  • 51% interest earned in Compañia Minera Newco Marimaca (CMNM) with a $125k payment together with completion of an NI43-101 resource estimate and engineering study that demonstrates the technical and economic feasibility of producing a minimum of 1.5ktpy Cu cathode by August 6th 2018 at Coro’s cost,
  • Additional 24% interest in CMNM earned by Coro upon obtaining financing for the project construction
  • The owner’s interest will comprise a 15% interest free carried to commencement of commercial production and a 10% participating interest subject to dilution. The owners at their election may request Coro to loan them the equity portion corresponding to their 10% interest, if any, recoverable by Coro from 100% of the project’s free cash flow after debt repayments
  • Coro retains a first right of refusal

Fig 1: Marimaca Location

Fig 2: Marimaca Drill Plan

Table 3: Marimaca Drill Collars

HOLE E N Elev Az Inc TD
MAR-01 375088 7435527 1107.05 0 -90 140
MAR-02 374953 7435476 1094.39 0 -90 150
MAR-03 375003 7435412 1092.97 275 -60 200
MAR-04 374918 7435431 1054.24 310 -60 200
MAR-05 375080 7435590 1123.72 220 -60 200
MAR-06 375073 7435594 1123.72 310 -60 200
MAR-07 375116 7435529 1107.13 330 -55 210
MAR-08 374965 7435460 1096.27 310 -55 150
MAR-09 375027 7435242 1029.87 310 -55 150
MAR-10 375073 7435209 1045.81 310 -55 170
MAR-11 375060 7435210 1045.81 220 -55 170
MAR-12 375092 7435117 1044.06 310 -55 150
MAR-13 375155 7435148 1057.25 310 -55 150
MAR-14 375027 7435238 1029.87 220 -55 120
MAR-15 375314 7434985 1023.47 310 -55 200
MAR-16 375095 7435110 1044.06 220 -55 120


Alan Stephens President and CEO

About Coro Mining Corp.:

Coro’s strategy is to grow a mining business through the discovery, development and operation of “Coro type” deposits.

These are defined as projects at whatever stage of development, that are well located with respect to infrastructure and water, which have low permitting risk, and which have the potential to achieve a short and cost effective timeline to production. Our preference is for open pit heap leach copper projects, where we will seek to minimise capital investment rather than maximise NPV, where we will prioritise profitability over production rate, and finally, where the likely capital cost is financeable relative to our market capitalization. The Company’s assets include its 65% interest in SCM Berta; the Planta Prat and Marimaca projects; the Llancahue prospect, optioned to Industrias Peñoles; and a royalty on the San Jorge copper-gold project located in Argentina.

For further information please visit the Company’s website at

This news release includes certain “forward-looking statements” under applicable Canadian securities legislation. Such forward-looking statements or information, include but are not limited to those with respect to the geological potential and size of Marimaca. Forward-looking statements involve known and unknown risks, uncertainties and other factors which are beyond Coro’s ability to predict or control and may cause Coro’s actual results, performance or achievements to be materially different from any of its future results, performance or achievements expressed or implied by forward -looking statements. These risks, uncertainties and other factors include, but are not limited to, the operation of the Nora Plant, copper price volatility, and changes in debt and equity markets. Such forward-looking statements are also based on a number of assumptions which may prove to be incorrect, changes in project parameters as plans continue to be evaluated, as well as those factors disclosed in the Company’s documents filed from time to time with the securities regulators in the Provinces of British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, New Brunswick, Nova Scotia, Prince Edward Island and Newfoundland and Labrador.

Accordingly, readers should not place undue reliance on forward-looking statements. Coro undertakes no obligation to update publicly or otherwise revise any forward-looking statements contained herein whether as a result of new information or future events or otherwise, except as may be required by law.

Category: General