NI 43-101 Technical Report for Danglay Gold Project, Philippines

ECR MINERALS plc
(“ECR Minerals”, “ECR” or the “Company”)

 

AIM: ECR

US OTC: MTGDY

 

 

LONDON: 21 DECEMBER 2015 - The directors of ECR Minerals plc (the “Directors”) are pleased to announce the publication of the Canadian NI43-101 technical report (the “Report”) in respect of the Danglay gold project in the Philippines (formerly known as the Itogon project). 

The Report supports the disclosure on 5 November 2015 of an inferred mineral resource estimate for oxide gold mineralization at Danglay.  A revised inferred mineral resource estimate is disclosed in the Report and is tabulated below as Table 1.  The reasons for the revision are set out below.

ECR is the operator of the Danglay project with the right to earn a 50% interest therein, pursuant to an earn-in and joint venture agreement between ECR, Tiger International Resources, Inc. (“Tiger International”) and Cordillera Tiger Gold Resources, Inc.

The executive summary from the Report is excerpted below.  The full report has been filed by Tiger International, as the party subject to Canadian regulation, on SEDAR (www.sedar.com).  The full report is available for download from SEDAR, and will be made available for download today from the ECR website (www.ecrminerals.com).

The Report discloses a target for further exploration (the “Exploration Target”), as permitted by NI43-101.  The basis on which the Exploration Target has been disclosed in the Report is set out therein, and has been excerpted below.  ECR previously disclosed the Exploration Target, in accordance with NI43-101, in its announcement dated 5 November 2015.  The following risk warning should be noted with respect to the Exploration Target.

A target for further exploration is not a mineral resource estimate, is conceptual in nature, and is used where there has been insufficient exploration to define the target as a mineral resource and where it is uncertain if further exploration will result in the target being delineated as a mineral resource. 

 

Stephen Clayson, Chief Executive Officer of ECR, commented:

“The Report includes, in summary form, all material scientific and technical information in respect of the Danglay project as of the effective date of the document, and the Directors hope that the Report will help ECR shareholders, potential investors and any other interested parties come to a more detailed understanding of the merits of the project.

The Report makes detailed recommendations for further exploration at the Danglay project, with a budget of US$775,000.  The Directors are considering the extent to which these recommendations may be implemented by ECR, and a further announcement will be made in due course.

Separately, the Directors are pleased to note recent political developments in Argentina, including the election of a new president who is seen to be relatively pro-business, and the liberalisation of currency controls.  The Directors expect to provide an update regarding the outlook for the Company’s SLM gold project in Argentina in early 2016.”

 

Revised Resource Estimate

An inferred oxide gold mineral resource estimate with respect to the Danglay project was disclosed on 5 November 2015 with an effective date of 24 October 2015, and is tabulated below as Table 2.  This was a ‘global’ mineral resource estimate with respect to oxide mineralization at the Danglay project. 

During the process of completing the Report, three areas of oxide mineralization (known as Danglay Ridge, Hillside and Bito) were identified.  In order to better assess the exploration potential of these areas and more effectively plan further exploration, Mr Neil Motton BSc (Hons), MAusIMM (CP - Geology), MSEG, of the consultancy Snapper Resources Ltd (“Snapper”), was asked to estimate the oxide resource for each area as three separate domains.  This resulted in the revised mineral resource estimate tabulated below as Table 1. 

Mr Motton is independent of ECR and Tiger International and is a Qualified Person under NI43-101 for the purposes of estimating the mineral resource, which is disclosed in accordance with NI43-101 and has been estimated in accordance with the requirements of the Canadian Institute of Mining, Metallurgy and Petroleum (CIM) “Estimation of Mineral Resource and Mineral Reserves Best Practice Guidelines” and the JORC Code.

 

Table 1:

Inferred Mineral Resource Estimate

Oxide Mineralization

Danglay Gold Project (EP-006-2011-CAR), Baguio District, Philippines

Effective date: 18 December 2015

Disclosed in accordance with Canadian NI43-101

Cut-off grade: 0.75 g/t gold

 

Domain

Tonnes

Grade (g/t gold)

Gold (oz)

Danglay Ridge

387,000

1.73

21,500

Hillside

630,250

1.48

30,000

Bito

260,250

1.43

12,000

Total oxide

1,277,500

1.55

63,500

The key assumptions, parameters and methods used in the preparation of the above tabulated resource estimate are disclosed along with other items required under NI43-101 in the Report.  The mineral resource estimate is disclosed at a cut-off grade of 0.75 g/t gold.  The basis for the selection of this cut-off grade is set out in the Report.  Figures have been rounded to reflect the relative accuracy of the estimate.  Mineral resources are not mineral reserves and do not have demonstrated economic viability.  There is no certainty that all or any part of the mineral resource will be converted into a mineral reserve.

 

Table 2:

Inferred Mineral Resource Estimate

Oxide Mineralization

Danglay Gold Project (EP-006-2011-CAR), Baguio District, Philippines

Effective date: 24 October 2015

Disclosed in accordance with Canadian NI43-101

Cut-off grade: 0.75 g/t gold

 

Domain

Tonnes

Grade (g/t gold)

Gold (oz)

Oxide in situ

919,000

1.65

48,500

Oxide scree

281,000

1.35

12,000

Total oxide

1,200,000

1.6

60,500

 

Executive Summary (excerpted from the Report)

Exploration Alliance Ltd (“EAL”) was asked by ECR Minerals plc (“ECR”) to produce a National Instrument 43-101 (“NI43-101”) compliant technical report supporting the disclosure by Tiger International Resources, Inc. (“Tiger International”) of a mineral resource estimate for the Danglay gold project in the Philippines.  The oxide mineral resource was estimated by Mr Neil Motton of the consultancy Snapper Resources Ltd (“Snapper”).

The Danglay project is covered by Exploration Permit (“EP”) 006-2011-CAR, which comprises 330 contiguous hectares, and within which is situated an exploration prospect known as the Danglay gold prospect. The EP was issued to a Philippine corporation named Cordillera Tiger Gold Resources, Inc. (“CTGR”), which is 100% beneficially owned by Tiger International, on the 15th February 2011 for an initial two-year exploration period. The EP was renewed with a date of 1st October 2013 for a further two-year term, which expired on 30th September 2015.  Application for renewal of the EP for a third two-year exploration term has been made.  After expiry of this third exploration term, the EP may be renewed for an additional two years for the purpose of completing feasibility studies and making application for a mining licence only (as opposed to further exploration).

ECR holds the right to earn up to a 50% interest in CTGR, pursuant to an earn-in and joint venture agreement between ECR, CTGR and Tiger International, dated the 26th April 2013 (as amended). ECR has been the operator of the Danglay project, through CTGR, since the commencement of the earn-in on the 6th December 2013.

The Danglay project is located in the Republic of the Philippines on the northern island of Luzon. It is approximately 14 kilometres to the southeast of Baguio City and lies within the prolifically gold-copper mineralized Baguio District. The project has a history of artisanal mining which currently continues on a very small scale—local miners extract weathered and oxidized quartz veins from a series of near surface shallow adits and process the material onsite using very small scale mills, and rudimentary gravity and cyanide leach recovery techniques.

Benguet Exploration reviewed the prospect in the 1960s by driving two exploration adits. Subsequently, limited drilling was completed by BHP Engineering Pty Ltd (Australia) on behalf of New Australian Resources N.L., which allowed the estimation of an oxide gold resource. Limited bench-scale metallurgical testing was also completed. In 1996 Placer Pacific Exploration, Inc. conducted limited exploration and estimated an oxide resource using BHP’s data. Several other entities/groups have visited the property and completed reports as outlined in Section 5 of this report.

Primary mineralization at Danglay is of an intermediate sulphidation type comprising multiple steeply-dipping, quartz-sulphide-base metal sulphide veins and breccias, and associated quartz-vein stockwork and silica-clay pyrite selvages. Weathering and oxidation of primary mineralization, and pyrite in wall rocks, has resulted in development of an oxide (supergene) gold blanket.  To date three mineralized zones have been defined: Danglay Ridge, Hillside and Bito—with cumulative strike length of approximately 600 metres and individual widths of up to 100 metres. 

Since commencing field work in January 2014, ECR have completed a well-designed exploration program comprising a prospect-wide topographic survey, 935 metres of surface channel sampling, 383 metres of underground channel sampling, 440 metres of trench sampling, 30 geochemical test pits, and 1812 metres of angled RC and diamond drilling.  The work was completed to a high standard and, based on the methodology outlined in Section 13 of this report, has enabled the estimation of an inferred oxide gold resource of 1,277,500 tonnes at a grade of 1.55 g/t Au for 63,500 ounces using a cut-off grade of 0.75 g/t Au—the resource estimate is effective the 18th of December 2015. Approximately 80% of the resource estimate comprises in situ oxide material and the remainder comprises talus that has moved downslope to some extent.

The inferred oxide resource estimate defines a broadly flat-lying zone that was modelled from surface to a maximum depth of approximately 20 metres—drill core logging indicates that oxidation may extend downwards along quartz veins and silicified structures to depths of at least 40 metres, suggesting that potential exists to extend the oxide zone deeper, subject to the results of further drilling. Possible strike extensions may also exist between the Danglay Ridge, Hillside and Bito zones, which will require drill testing.

In addition to estimation of an oxide resource, ECR requested that the author provide a target for further exploration with respect to primary mineralization at the Danglay prospect. On the basis outlined in Section 15 of this report, a lower bound target for further exploration was estimated at 600,000 tonnes at 5 g/t Au (95,000 contained ounces of gold) and an upper bound target was estimated at 700,000 tonnes at 7.5 g/t Au (170,000 contained ounces of gold). Targets for further exploration are not mineral resource estimates, are conceptual in nature, are used where there has been insufficient exploration to define the target as a mineral resource, and where it is uncertain if further exploration will result in the target being delineated as a mineral resource.

The intermediate sulphidation epithermal vein deposits of the Baguio District have been mined over 100s of vertical metres and giant deposits such as Antamok and Acupan have been mined over vertical intervals of approximately 600 to 800 metres.  Most production has come from quartz-pyrite-base metal sulphide veins and breccias with lesser production from carbonate-sulphide-base metal sulphide veins (for example the Sangilo deposit).  High and bonanza grade shoots occur within the broader vein architecture and are important contributors to overall mined grade.

Rock chip grab samples taken by the author at the Danglay prospect indicate that some parts of the veins, breccias and silicified structures are strongly gold-silver-base metal mineralized—a significant number of samples assayed above 15 g/t Au and a small number assayed above 100 g/t Au. Silver grades of 5-15 oz/t and base metal grades of between 1-2% zinc and up to 1% lead were also noted. The highest grade sample assayed 142 g/t Au, >16 oz Ag, >2% Zn, > 1% Pb and 0.31% Cu. These grades indicate that high to bonanza grade shoots are potentially present. This is consistent with the results of several ECR drill holes which intercepted significant grades over widths typical of intermediate epithermal sulphidation veins in the district. Verification rock chip grab sampling by the author also confirmed the widespread presence of oxide gold mineralization within the weathered zone above the primary sulphidic system, with grades of a similar or better tenor than those used to estimate the inferred oxide resource.

The styles and grades of primary mineralization at the Danglay prospect, presence of low iron sphalerite, and overall texture of veins and breccias, suggests that the intermediate sulphidation system at Danglay has only been eroded to the top of the quartz-sulphide-base metal sulphide interval—indicating robust exploration potential at depth.

Further angled diamond drilling is recommended in order to test the primary mineralization within the Danglay Ridge, Hillside and Bito zones. Understanding structure is key to successful exploration, since structure has exerted a fundamental control on vein formation, and post-mineralization faulting has disrupted, and in part terminated, primary mineralization. Drill holes should be designed to initially target the shallow down-dip extensions of the higher grade vein and structural zones. Quartz-pyrite-base metal sulphide vein breccias, and the intersection points of multiple veins, are considered especially prospective.

The proposed budget for infill drilling, metallurgical testwork and further resource modelling of the oxide zone is USD 375,000 and for further geochemical sampling, structural mapping and further scout drilling of the primary sulphide mineralization is USD 400,000.

 

Potential Quantity & Grade of Target for Further Exploration (excerpted from the Report)

Based on the extent and grade of outcropping mineralization, the style of mineralization and its similarities to other deposits in the Baguio District, and the exploration potential demonstrated by the exploration works completed to-date, ECR requested that the author discuss a target for further exploration in respect of the primary intermediate sulphidation vein-hosted mineralization below the inferred oxide gold resource.  The potential target for further exploration at the Danglay prospect includes the Danglay Ridge, Hillside and Bito mineralized zones.

 

Target for Further Exploration

Range

Tonnes

Grade (g/t gold)

Gold (oz)

Lower bound

600,000

5.0

95,000

Upper bound

700,000

7.5

170,000

 

A target for further exploration is not a Mineral Resource estimate, is conceptual in nature, and is used where there has been insufficient exploration to define the target as a Mineral Resource and where it is uncertain if further exploration will result in the target being delineated as a Mineral Resource.

 

Basis for Determination of Target for Further Exploration (excerpted from the Report)

The basis for estimation of the lower bound and upper bound targets for further exploration is outlined below.

Vein Width, Length and Vertical Extent:  To date three mineralized zones have been identified at the Danglay prospect which collectively have sufficient surface footprint to host multiple veins up to 225 metres long. The Danglay Ridge zone has an outcrop and surface geochemical footprint of approximately 175 metres by 100 metres, the Hillside zone has a surface footprint of approximately 250 metres by 100 metres, and the Bito zone has a strike length of approximately 200 metres and is up to 100 metres wide. Limited RC and diamond drilling by ECR intercepted gold mineralized veins and structures at vertical depths of approximately 75+ metres and mineralization remains open down-dip. Projecting the vertical extent of mineralization to depths of 100-150 metres is considered reasonable for estimation of a target for further exploration—especially given the vertical extent to which intermediate epithermal sulphidation veins of the Baguio District were mined. The use of vein widths of between one to three metres in the potential target for further exploration is supported by outcrop and intercepts in ECR’s RC and diamond drill holes.

Multiple Veins:  In determining the target for further exploration at the Danglay prospect, the author set the lower bound target on the basis that eight veins are present and the upper bound target on the basis that 10 veins are present. The distribution of outcropping veins and silicified structures, and the number of artisanal adits, supports the concept that there are multiple sub-parallel veins within the Danglay Ridge, Hillside and Bito mineralized zones.

Grade of Mineralization: The lower bound target for further exploration was based on an average grade of 5 g/t Au and the upper bound range on an average grade of 7.5 g/t Au. Channel and trench sampling by ECR targeted the broadly flat-lying, near surface oxide gold zone, where dispersion of gold between mineralized veins and structures is to be expected—most samples were extensively oxidized and are unlikely to reflect the grades of underlying quartz-pyrite-base metal sulphide veins.  A significant number of the rock-chip grab samples taken by the author targeted primary quartz-pyrite base metal sulphide veins, either in surface outcrop, or as material removed from the longer artisanal adits. Whilst these samples indicate that there is significant variation in gold, silver and base metal grades along the strike of a given vein, they also indicate that high grade to bonanza grade gold-silver shoots are likely to be present (Section 6.3.3: Mineralization).  Use of average grades of 5.0 g/t Au and 7.5 g/t Au is considered reasonable, given that a significant number of rock-chip grab samples returned very high assay grades, and modelled grades are in keeping with average grades from other deposits in the Baguio District, and the results from several of the ECR’s RC and diamond drill holes as outlined in Section 9.0 of this report. For example:

# ECR002 intercepted 5 metres @ 6.46 g/t Au from 10-15 metres (including 1 metre 21.85 g/t Au from 13-14 metres), 15 metres @ 3.29 g/t Au from 82-97 metres (including 2 metres @ 18.25 g/t Au from 9294 metres), and 17 metres @ 1.57 g/t Au from 101-118 metres (including 3 metres @ 5.45 g/t Au 103-106 metres).

# ECR004 intercepted 30 m of near surface oxide mineralization @ 1.63 g/t Au from 0-30 metres (including 2 metres @ 7.1 g/t Au from 0-2 metres and 1 metre @ 6.87 g/t Au from 15-16 metres) and 2 metres @ 9.43 g/t Au from 64-66 metres (including 1 metre @ 11.61 g/t Au from 64-65 metres).

 

Main Risks with Respect to Target for Further Exploration (excerpted from the Report)

The target for further exploration is based on a conceptual model that requires further detailed mapping and drill testing to confirm. As with any conceptual model there are inherent risks—in this case the author considers the major ones to be post mineralization structural complexity, actual grades, and the down-dip and strike continuity of veins.

Structural Complexity: There is significant evidence that post-mineral 020°-040° trending faults (Section 6.3.2: Structure) either truncate (e.g. the Northern Bounding Fault at the northern edge of the Danglay Ridge mineralized zone) or off set mineralization. The dip of these faults is poorly constrained, and dependent upon dip orientation and sense of fault movement, it is possible that they truncate mineralization at depth. The inability to accurately model 020°-040° fault architecture, or structure in general, with the present dataset should be considered a risk with respect to continuity of mineralization at depth. Similarly, whilst field evidence suggests that the Danglay Fault which bounds the Danglay Ridge and Hillside mineralized zones dips steeply to the east, the dip of the fault is poorly constrained and it is possible that it truncates the most westerly veins at depth.

Gold Grades:  The grades used to estimate the lower and upper bounds of the target for further exploration are based on the assumption that high to bonanza grades shoots occur within the broader vein architecture contribute to the overall grade. Assay results from rock-chip slabs clearly indicate that high and locally bonanza grade gold-silver mineralization is present at surface and in near surface artisanal adits. Several ECR drill holes also intercepted high grade mineralization at depth (Section 9: Drilling). Nevertheless, until further drilling is completed significant uncertainties remain with respect to grade and grade distribution, the presence or absence of significant high grade to bonanza grade zones, or the true thickness of mineralization at depth.   

Vein Continuity:  In addition to the uncertainties arising from the effects of post mineralization faulting, vein architecture at depth is poorly constrained, and the possibility exists that veins pinch and swell at depth dependent upon controlling structure architecture. Until further drilling is completed, uncertainty with respect to vein architecture remains a poorly quantified risk factor.

 

Review of announcement by Qualified Person

This announcement has been reviewed by William (Bill) Howell BSc (Hons), FAusIMM, FSEG, ECR’s Non-Executive Chairman.  Mr Howell is a geologist with 48 years of experience in the minerals industry, and is a Qualified Person as that term is defined by the AIM Note for Mining, Oil and Gas Companies.  

 

ABOUT ECR

ECR is a mineral exploration and development company with the right to earn a 50% interest in the Danglay epithermal gold project in the Philippines.  Danglay is an advanced exploration project located in a prolific gold and copper mining district in the north of the Philippines. 

ECR has a 100% interest in the SLM gold project in La Rioja Province, Argentina.  Exploration at SLM has focused on identifying small tonnage mesothermal gold deposits which may be suitable for relatively near term production.

FOR FURTHER INFORMATION PLEASE CONTACT:

ECR Minerals plc    
William (Bill) Howell, Non-Executive Chairman Tel: +44 (0)20 7929 1010
Stephen Clayson, Director & Chief Executive Officer    
Richard (Dick) Watts, Technical Director    
Email:This email address is being protected from spambots. You need JavaScript enabled to view it.    
Website: www.ecrminerals.com    
     
Cairn Financial Advisers LLP    
Nominated Adviser Tel: +44 (0)20 7148 7900
Emma Earl/Jo Turner    
     
     
Vicarage Capital Ltd & Company plc    
Broker Tel: +44 (0)20 3651 2910
Rupert Williams/Jeremy Woodgate    
     
     
     
Blytheweigh    
Public Relations Tel: +44 (0)20 7138 3204
Tim Blythe    
     

FORWARD LOOKING STATEMENTS

 

This announcement may include forward looking statements.  Such statements may be subject to a number of known and unknown risks, uncertainties and other factors that could cause actual results or events to differ materially from current expectations.  There can be no assurance that such statements will prove to be accurate and therefore actual results and future events could differ materially from those anticipated in such statements.  Accordingly, readers should not place undue reliance on forward looking statements.  Any forward looking statements contained herein speak only as of the date hereof (unless stated otherwise) and, except as may be required by applicable laws or regulations (including the AIM Rules for Companies), the Company disclaims any obligation to update or modify such forward looking statements as a result of new information, future events or for any other reason.

 

GLOSSARY

 

AAS:  atomic absorption spectroscopy

assay: a test performed on a sample of ore or minerals to determine the amount of valuable metals contained

channel sample:  a sample of pieces of vein or mineral deposit that have been cut out of a small trench or channel, usually about 10cm wide and 2cm deep

diamond drilling: a type of rotary drilling that utilises a fluid lubricated and cooled cylindrical diamond drill bit. As the drill bit cuts into the rock a cylindrical core of rock is recovered in the core barrel

drill core: rock samples recovered by diamond drilling     

epithermal: mineralization produced by near surface hydrothermal fluids related to igneous activity; originally defined as having formed in the range 50-300°C.

inferred mineral resource:  that part of a mineral resource for which quantity and grade or quality can be estimated on the basis of geological evidence and limited sampling and reasonably assumed, but not verified, geological and grade continuity. The estimate is based on limited information and sampling gathered through appropriate techniques from locations such as outcrops, trenches, pits, workings and drill holes

intermediate sulphidation:  epithermal gold and silver deposits of both vein and bulk-tonnage styles may be broadly grouped into high-, intermediate-, and low-sulphidation types based on the sulphidation states of their primary sulphide assemblages.  From an exploration perspective, intermediate sulphidation systems generally occur peripheral to porphyry copper-gold deposits but at deeper levels than low sulphidation systems.  Mineralization is typically hosted in steeply dipping veins and breccia zones which may contain high grade shoots.  Stockwork zones between vein sets may represent lower grade bulk tonnage targets.  Intermediate sulphidation systems generally have a vertical metal endowment of hundreds of metres

g: grams  

g/t: grams per tonne

m and cm: metre and centimetre, respectively

mineral reserve: the economically mineable part of a measured or indicated mineral resource demonstrated by at least a preliminary feasibility study

mineral resource: a concentration or occurrence of diamonds, natural solid inorganic material, or natural solid fossilised organic material including base and precious metals, coal, and industrial minerals in or on the Earth’s crust in such form and quantity and of such a grade or quality that it has reasonable prospects for economic extraction.  The location, quantity, grade, geological characteristics and continuity of a mineral resource are known, estimated or interpreted from specific geological evidence and knowledge.

Mineral resources are sub-divided, in order of increasing geological confidence, into inferred, indicated and measured categories. An inferred mineral resource has a lower level of confidence than that applied to an indicated mineral resource. An indicated mineral resource has a higher level of confidence than an inferred mineral resource but has a lower level of confidence than a measured mineral resource

oxidation: a chemical reaction caused by exposure to oxygen that results in a change in the chemical composition of a mineral

oxide gold: said of gold that has been liberated from sulphides during the process of oxidation to form a surficial, sub-horizontal to horizontal zone

preliminary economic assessment (PEA): a study, other than a prefeasibility or feasibility study, that includes an economic analysis of the potential viability of Mineral Resources

primary deposit: valuable minerals deposited during the original period or periods of mineralization, as opposed to those deposited as a result of alteration or weathering

quartz: common rock-forming mineral consisting of silicon and oxygen

ppm: parts per million

reverse circulation (RC) drilling: percussive drilling method in which cuttings are raised to surface by a stream of compressed air inside the drill rods

t: tonne

stockwork: a network of veinlets, usually quartz

sulphide: a compound of sulphur and some other element

supergene enrichment: said of a mineral deposit formed at or just below the Earth’s surface, generally through downward percolation of rainwater, resulting in liberation of gold through oxidation of sulphides, and its concentration and enrichment within a given horizon

trench: a long, narrow excavation dug through the upper parts of the soil profile or overburden to expose bedrock veins and structures

vein: material which was chemically deposited by fluids within a rock fracture; veins exhibit a range of textures and minerals, depending primarily on the temperature, depth, and composition of the fluid and host rock; may also contain a small amount (<10%) of entrained host rock and/or vein clasts

zone/domain: an area of distinct mineralization