CELSIUS TO ACQUIRE ADVANCED HIGH GRADE COPPER-GOLD PROJECT
HIGHLIGHTS
- Celsius enters Binding Share Sale Agreement to acquire 100% of UK Company Anleck Limited, an entity that owns, through various subsidiaries, a suite of copper-gold projects in the Philippines.
- As part of the Binding Share Sale Agreement, Anleck shareholders will become significant shareholders of Celsius and will remain actively involved in the development of the copper-gold projects in the Philippines.
- Flagship project is the Maalinao-Caigutan-Biyog Copper Gold Project (“MCB Project”), which contains a large, high grade copper gold porphyry deposit.
- Surface exploration at the MCB Project commenced in 2006 and a drilling program was conducted between December 2006 and 2013. A total of approximately PHP511,330,000 (AUD14,480,000) was spent on exploration during the period.
- Results from historical drilling at the MCB Project, conducted by Makilala Mining Co., Inc. (MMCI) which was a wholly owned subsidiary of Freeport-McMoRan, one of the world’s largest copper/gold producers, include:
- 384.00 m @ 1.25% copper & 0.46 g/t gold, within 767.00 m @ 0.77% copper & 0.27 g/t gold
- 77.00 m @ 1.98% copper & 0.95 g/t gold, within 630.50 m @ 0.81% copper & 0.32 g/t gold
- 186.85 m @ 1.84% copper & 0.86 g/t gold, within 612.00 m @ 0.82% copper & 0.31 g/t gold
- 243.30 m @ 1.38% copper & 0.75 g/t gold, within 505.00 m @ 0.87% copper & 0.38 g/t gold
- 92.00 m @ 1.80% copper & 1.12 g/t gold, within 680.00 m @ 0.54% copper & 0.20 g/t gold
- Maiden JORC compliant Mineral Resource is in progress, and expected to be reported once the in-country COVID quarantine restrictions allow access to the site.
- A Scoping Study will commence immediately upon delivery of the JORC Mineral Resource.
- Appointment of new Anleck board nominees and management will occur upon completion of the acquisition of Anleck Limited.
- Acquisition complements current portfolio of greenfield copper-gold assets in Australia and more advanced cobalt-copper project in Namibia.
Celsius Resources Limited (Celsius or the Company) (ASX: CLA) is pleased to announce it has entered into a Binding Share Sale Agreement (Anleck Acquisition Agreement) to acquire 100% of the issued capital of Anleck Limited, a private UK company that owns, through various subsidiaries, a suite of copper-gold projects in the Philippines.
Anleck owns a number of copper-gold projects through its acquisition of Makilala Holding Limited (an entity incorporated in the British Virgin Islands) (Makilala Acquisition). The Makilala Acquisition completed prior to the execution of the Anleck Acquisition Agreement under the terms of a separate agreement between Anleck and the owner of Makilala Holding Limited (MHL Acquisition Agreement). Further details on the Anleck Acquisition Agreement and the MHL Acquisition Agreement are set out later in this announcement.
The key asset in the portfolio is the Maalinao-Caigutan-Biyog (MCB) Project, a copper-gold project situated within the Central Cordillera Region in the Island of Luzon, Philippines, approximately 320 km north of Manila. The MCB Project contains a large, high grade copper-gold porphyry deposit that has seen historical drilling conducted by Makilala Mining Co. Inc. (a wholly owned subsidiary of Freeport-McMoRan Inc., at the time), between 2006 and 2013 (detailed below).
The other assets in the Anleck portfolio (through its subsidiaries) are five (5) exploration permit applications and two (2) granted exploration permits for renewal/extension. The two key prospects within this group are the Nabiga-a Prospect (granted exploration permit for extension) and the Malangsa Prospect (Exploration Permit Application). Further details are set out below and in Appendix 3 of this announcement.
Commenting on the acquisition, Celsius Resources’ Non-Executive Director and Chairman Bill Oliver said:
“The MCB Copper-Gold Project represents a transformative opportunity for Celsius to acquire an advanced project in two commodities that are anticipated to be highly sought after in coming years. The Project complements our current portfolio of greenfield copper-gold projects in Australia and more advanced cobaltcopper Project in Namibia, providing shareholders exposure to different commodities and jurisdictions.
“Recent changes to legislation and governance in the Philippines means that it is emerging as an attractive investment destination, and its well-known copper and gold endowment is likely to encourage further parties into an already active mining sector.
“Once acquired, we will move quickly to ramp up work on the Project. Currently, Anleck and Celsius are progressing a maiden JORC resource estimate for Makilala which is expected to be delivered once COVID quarantine restrictions ease, which will be followed by the commissioning of a Scoping Study.
“We are excited about the future of Celsius and the potential of the MCB Project and our other assets and look forward to keeping shareholders informed on the Anleck Acquisition as we move ahead rapidly across our suite of projects.”
Commenting on the acquisition, Anleck Director Martin Buckingham said:
“Anleck sees huge opportunity in the MBC Project as a world class resource with the potential to be a future copper and gold producer within the Asia Pacific region. The Anleck team’s vast experience operating in the Philippines for over 20 years will ensure it is well positioned to successfully advance the Project towards development. The MCB Project, along with other tenements within the Anleck portfolio, offer additional value and potential growth for Celsius shareholders. We are excited to be part of the Celsius team and look forward to supporting the Company’s growth plans to develop the suite of global metalliferous projects and working with shareholders to drive value into the company.”
Historical Exploration
The MCB Copper-Gold Project (MCB) is located in the Cordillera Administrative Region in the Philippines, approximately 320 kilometers north of Manila (Figure 1). It is the flagship project within the Makilala portfolio which also contains other key prospects in the pipeline for permit renewal/extension.
Surface exploration on the MCB Project commenced in 2006 and a drilling program was conducted by Makilala Mining Co. Inc. (MMCI), between December 2006 and 2013. Exploration activity included:
- (a) geological mapping, soil sampling, ground magnetics and limited IP geophysical surveys; and
- (b) 46 diamond drill holes (25,547 m), completed by 2013. A total of approximately AUD14.5 million has been spent on the MCB Project on historical exploration and associated costs.
Significant drilling results from this work included: (Figures 2, 3 and 4)
- 767.00 m @ 0.77% copper and 0.27 g/t gold, from 30 m, including 384.00 m @ 1.25% copper and 0.46 g/t gold, from 384 m (MCB-030)
- 630.50 m @ 0.81% copper and 0.32 g/t gold, from 11.5 m, including 177.00 m @ 1.98 % copper and 0.95 g/t gold, from 349 m (MCB-018)
- 612.00 m @ 0.82% copper and 0.31 g/t gold, from 18 m, including 186.85 m @ 1.84% copper and 0.86 g/t gold, from 363 m (MCB-009)
- 505.00 m @ 0.87% copper and 0.38 g/t gold, from 29 m, including 243.30 m @ 1.38% copper and 0.75 g/t gold, from 103 m (MCB-002)
- 680.00 m @ 0.54% copper and 0.20 g/t gold, from 34 m, including 92.00 m @ 1.80% copper and 1.12 g/t gold, from 382 m (MCB-029)
- 325.00 m @ 0.86% copper and 0.13 g/t gold, from 18 m (MCB-011)
- 548.80 m @ 0.51% copper and 0.03 g/t gold, from 8 m (MCB-010/10A)
- 438.70 m @ 0.45% copper and 0.16 g/t gold, from 4 m (MCB-019)
- 452.50 m @ 0.48% copper and 0.06 g/t gold, from 31.5 m, including 41.25 m @ 0.81% copper and 0.08 g/t gold, from 109.50 m and 54.00 m @ 0.63% copper and 0.06 g/t gold, from 280.00 m (MCB-003)
- 222.65 m @ 0.62% copper and 0.60 g/t gold, from 11.35 m, including 142.90 m @ 0.81% copper and 0.85 g/t gold, from 11.35 m (MCB-025)
- 384.00 m @ 0.40% copper and 0.26 g/t gold, from 8 m, including 28.00 m @ 0.63% copper and 0.26 g/t gold, from 354 m (MCB-020)
- 540.60 m @ 0.37% copper and 0.06 g/t gold, from 18 m, including 12.00 m @ 0.80% copper and 0.06 g/t gold, from 146 m and 14.90 m @ 0.58% copper and 0.65 g/t gold, from 276 m (MCB-008)
- 359.80 m @ 0.40% copper and 0.11 g/t gold, from 4 m (MCB-001)
- 142.00 m @ 0.61% copper and 0.43 g/t gold, from 174 m, including 76.00 m @ 0.72% copper and 0.60 g/t gold, from 204 m (MCB-022)
- 252.00 m @ 0.42% copper and 0.11 g/t gold, from 46 m, including 42.00 m @ 0.48% copper and 0.20 g/t gold, from 50 m (MCB-023)
A full listing of significant intercepts and drillhole collars are provided in Appendix 1.
Exploration work conducted by MMCI include surface mapping and sampling (2007), ground magnetic survey (2007), and induced polarisation (IP) geophysical surveys (2010).
To date, no JORC Compliant Mineral Resources has been declared for the MCB Project, however, a maiden resource estimate is currently in progress and is expected to be reported once the current COVID quarantine restrictions have been reduced.
Geology and Mineralisation
At a regional scale, the host rocks at the MCB Project exist within a 300 km long north-south trending mountain range known as the Central Cordillera, which is located in Northern Luzon. The Central Cordillera is interpreted to have formed as a result of subduction along the Manila Trench (Bellon and Yumul, 2000). This tectonic activity resulted in the formation of a magmatic arc causing uplift and intrusion of numerous large plutons, some of which are related to porphyry copper-gold-molybdenum deposit types and epithermal gold-silver deposits.
Significant porphyry copper-gold deposits exist throughout the Central Cordillera, ranging from the south near the city of Baguio (including the Philex deposit), up to the Lepanto Deposit in the central portion of the Cordillera and further north to the MCB Project area which includes the adjacent Batong Buhay Copper-Gold deposit.
The local geological setting for the MCB Project copper-gold mineralisation is typical of a porphyry copper-goldmolybdenum deposit. The copper-gold mineralisation and associated alteration exist across the contact between a genetically related intrusive body (tonalite) and the surrounding host rock. In most cases the surrounding host rock is a mafic volcanic, however, in some instances older (not genetically related to coppergold mineralisation) intrusive bodies also exists in contact with the younger intrusion, resulting in broad sections of mineralisation and alteration contained within a series of intrusive bodies.
There is also evidence that the MCB Project lies adjacent to a gold rich epithermal vein deposit, which exists within close proximity to the large-scale porphyry copper-gold mineralisation. At this stage, the most significant deposit identified at the MCB Project is a porphyry style of copper-gold mineralisation.
Additional Assets
While Anleck has access to tenements around the MCB Project which are yet to be explored, the potential exists to develop the Nabiga-a Prospect which is located in the Northern part of Negros Island, Philippines. Eight drillholes have been completed for a total metreage of 3546.9 m. Results from this Prospect are being compiled by Anleck and will be released once reviewed and verified.
The Malangsa Prospect is located in Southern Leyte and is currently at an early exploration stage. An initial survey identified possible economic porphyry-HS epithermal and Cu-Au mineralisation and has justified that
further exploration work needs to be undertaken.
Other Regional Mineral Deposits
The MCB Project sits adjacent to the Dickson copper-gold deposit within what is known as the Kalinga Mineral District situated in the northern part of the Luzon Central Cordillera, which is a complex of intrusives and volcanic centres cut by the horse-tailed northern segment of the Philippine Fault Zone. The Luzon Central Cordillera is the setting of several mineralised centres stretching from the Philex Mine in the South, the Baguio Cu-Au District, the Mankayan- Lepanto Cu-Au District and Kalinga Cu-Au District in the North. It is described as a batholitic arc developed as a result of the eastward subduction of the South China Sea Plate along the Manila Trench.
Infrastructure
The MCB Project is located in Barangay Balatoc, Municipality of Pasil, Province of Kalinga. From Manila, the best route to reach the project site is via the Cagayan Valley road going to the City of Tabuk, hence to the municipality of Pasil. Distance from Tabuk to Pasil is approximately 60 km via the Tabuk-Lubuagan-Bontoc SONA Highway, which is a travel time of approximately 3 hours utilizing four-wheel drive vehicles. From Lubuagan junction, access is through approximately 24 km of rough dirt road.
Tabuk could be reached from Manila via Tuguegarao City. Tuguegarao has daily flights from Manila with travel time of about 50 minutes. Tuguegarao is located inland along the Cagayan River Valley. Travel by public utility bus is also available from Manila to Tuguegarao and takes about 12 hours.
Settlements are generally small, compact, and occupy a limited area and are located in the main Barangay of Balatoc. Most of the areas within and surrounding the MCB Project tenement are natural land covers consisting of grassland with sporadic pine trees.
Board and Management
Upon settlement of the transaction, Anleck will nominate 2 board members to the Celsius Board, including at least one member resident in the Philippines. Celsius also intends to retain Anleck’s management team in country who have an existing association with the Project along with over 20 years’ experience managing Philippine resources projects, including engaging with all levels of relevant government institutions as well as managing stakeholder relations, specifically with respect to the MCB Project.
On settlement, two directors of Celsius will resign from the Board and be replaced by Martin Buckingham and Attilenore Austria, both of whom have an in depth understanding of the MCB Project and what is required to develop the Project into an operating mine. Martin has over 20 years in developing and operating mines in the Philippines and Attilenore has a sound understanding of, and a wealth of experience in developing statutory plans for securing government approvals for mining applications, securing the social license to operate, stakeholder engagements, social impacts/development management, working with Philippine government agencies, local government units and Indigenous Cultural Communities.
Martin Buckingham (MA Cantab) has over 40 years’ experience in resource industries and has been Director and held senior management positions with various mining companies in the UK and overseas. Companies include Clogau Gold Mines plc, Atlas Consolidated Mining and Development Corp (Philippines) as EVP and CFO and Director of its wholly owned subsidiary Carmen Copper Corporation, Berong Nickel Corp, Electrum NL, Philippine Gold plc, Director and co-founder of Consort Research Limited, a metallurgical consultancy group based at the Royal School of Mines in London. In 2007, he took a lead role in the consortium which successfully re-opened the Carmen Copper Mine in Cebu, Philippines, which is now the largest copper producer in the country, producing +40,000 tons of copper metal per year. He retired from executive positions at Atlas group recently, but remains a Director. Recently Martin was founder of Anleck Limited which set out to develop the Makilala project portfolio previously owned by Freeport-McMoRan.
Attilenore Austria has worked with major Philippine public infrastructure, mining and hydropower projects for more than 10 years managing diverse teams of local and international experts to carry out studies leading to the development of plans and programs in compliance with national regulatory requirements and international standards. She worked closely with environmental and engineering teams to ensure that social impacts are avoided or kept at the minimum while developing key project consultation and negotiation strategies to manage anticipated social, economic and cultural impacts essential to obtaining a social license to operate. Prior to these, Ms. Austria has more than 10 years of development work with World Bank and EU funded integrated rural development programs all over the Philippines. She holds a PhD in Rural Development and has extensive working knowledge in stakeholder engagements, project risk management, project scheduling, community development, socio-cultural baseline studies, social impacts assessment, etc.
Transaction Overview
Anleck Acquisition Agreement
The material terms of the Anleck Acquisition Agreement are as follows:
- Celsius to issue 100,000,000 fully paid ordinary shares to the shareholders in Anleck (or nominees) (Consideration Shares). 50,000,000 of these shares will be subject to a buy-back and cancellation right in favour of Celsius (Buyback Right). Celsius may only exercise the Buyback Right and conduct the selective share buyback and cancellation if, on the date falling one (1) year following settlement, Celsius has failed to announce to the ASX that Celsius and/or its related bodies corporate have completed an economically viable Scoping Study on the MCB Project, and that the report has been prepared in accordance with the requirements of the JORC Code.
- Celsius has also agreed to issue an additional 100,000,000 shares in two equal tranches of 50,000,000 each to the Anleck shareholders (Deferred Consideration Shares), subject to the following events occurring:
- 50,000,000 shares upon securing and entering into a financial and technical assistance agreement (FTAA) or a mineral production sharing agreement (MPSA) with the Philippines Government in relation to the MCB Project, provided this occurs within 36 months of settlement; and
- 50,000,000 shares upon Celsius announcing to ASX that it has completed an economically viable Definitive Feasibility Study (DFS) in relation to the MCB Project, provided this occurs within 36 months of settlement.
- At settlement of the acquisition of Anleck, Celsius has also agreed to reimburse the Anleck shareholders for up to US$150,000 they have incurred in finalising the transaction with Makilala Holding Limited.
- The acquisition of Anleck is subject to and conditional upon satisfaction of the following conditions precedent:
- Due Diligence: Completion by Celsius of due diligence on Makilala Holding Limited, its subsidiaries and assets.
- Celsius approvals: Celsius obtaining any required approval or waivers from ASX and its shareholders to give effect to the acquisition (including but not limited to shareholder approval for the issue of the Consideration Shares and the Deferred Consideration Shares); and
- Permit Renewal: permit renewal for tenement number EP-003-2006-CAR. held by Makilala Mining Co Inc, by the Mines and Geo-sciences Bureau in the Philippines (MGB) (the Permit Renewal) Celsius confirms that it is satisfied with its technical due diligence on the MCB Project and there are only relatively minor legal and financial due diligence items that still need to be addressed. The above conditions precedent must be satisfied within six (6) months of execution of the Anleck Acquisition Agreement and may be waived at Celsius’ election.
- Between the date of the Anleck Acquisition Agreement and settlement, CLA will lend Anleck up to US$130,000 for purposes of completing all necessary work programs and in-country approval processes for the Permit Renewal.
MHL Acquisition Agreement
As noted at the beginning of this announcement, Anleck has acquired MHL through a separate Acquisition Agreement. By virtue of Celsius acquiring Anleck, Celsius will effectively assume the obligations of Anleck under the MHL Acquisition Agreement.
The material terms of the MHL Acquisition Agreement are as follows:
- Anleck has agreed to pay the vendor of Makilala Holding Limited a total of up to US$3,000,000 in cash, payable as follows:
- US$250,000 on settlement of the Makilala Acquisition (this has already been paid) (Settlement Payment);
- US$550,000 upon the Permit Renewal occurring;
- US$1,100,000 on the first anniversary of the Permit Renewal;
- US$1,100,000 on the second anniversary of the Permit Renewal; and
- a 1% net smelter return royalty (capped at US$3m over 10 years), with minimum pre-payments of US$100,000 per annum (up to a cap of US$1m) commencing on the third anniversary of the Permit Renewal.
- The vendor has also been granted a lien over some of the shares owned by Anleck Limited in Makilala Holding Limited as security for the deferred payments set out above.
- As part of the Anleck Acquisition Agreement, Celsius has:
- advanced the Settlement Payment to the vendor of Makilala Holding Limited; and
- transferred US$550,000 to a trust account to be held in trust pending the occurrence of the Permit Renewal (and to be released to the vendor of Makilala Holding Limited when this occurs).
- The advances referred to above have been made to Anleck by Celsius under a separate loan agreement on arm’s length terms, which is secured by both a general security deed over Anleck and a share mortgage over the shares that Anleck owns in Makilala Holding Limited.
The group structure of Makilala Holding Limited is set out in Appendix 4.
Process for the Permit Renewal
An Exploration Permit over the tenement EP-003-2006-CAR was first issued to Makilala Mining in 2006, it was then amended in 2007 consolidating the tenement from 5 parcels of land to only 1 with a total area of 2,719.5748 Hectares. Since then, two exploration permit renewals have been issued in 2008 and 2010 while the application for 3rd renewal has already been submitted to the Philippine Mines and Geosciences Bureau (MGB) and due for release subject to the submission and evaluation of the updated Exploration and Environmental Work programs, proof of financial, technical capability and an updated company general information sheet (GIS). Once the renewal of exploration permit is granted, it will be valid for a period of two years, within which the company will be required to implement the approved work programs, ensuring that all permit conditions are duly complied with in accordance with the Philippine Mining Act.
Appointment of Corporate Adviser
In conjunction with the acquisition of Anleck, Celsius has engaged Ironside Capital Pty Ltd (Ironside) as its corporate adviser on a month to month contract and Celsius has agreed to pay Ironside a fee of A$5,000 per month (plus GST) in respect of this engagement.
On and from settlement of the acquisition of Anleck, Celsius has agreed to appoint Ironside as its corporate advisor for a period of 12 months and Celsius has agreed to pay Ironside a fee of A$10,000 per month (plus GST) in respect of this engagement. In addition, Celsius has agreed to grant Ironside (or its nominee(s)) the right to subscribe for 50,000,000 options to acquire Shares in Celsius at an issue price of $0.0001 each (Advisor Options). The Advisor Options will have an exercise price of $0.012 per share and an expiry date that is 30 months from their issue date.
This announcement has been authorised by the Board of Directors of Celsius Resources Limited.
Celsius Resources Contact Information
Level 2, 22 Mount Street
Perth WA 6000
PO Box 7054
Cloisters Square Perth WA 6850
P: +61 8 6188 8181
F: +61 8 6188 8182
E: info@celsiusresources.com.au
www.celsiusresources.com.au
Media contact
David Tasker / Colin Jacoby
Chapter One Advisors
M: +61 433 112 936 / +61 439 980 359
E: dtasker@chapteroneadvisors.com.au / cjacoby@chapteroneadvisors.com.au
Competent Persons Statement
Information in this report relating to Exploration Results is based on information compiled, reviewed and assessed by Mr. Steven Olsen, who is a Member of the Australasian Institute of Mining and Metallurgy and the Australian Institute of Geoscientists. Mr. Olsen is a consultant to Celsius Resources and has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined by the 2012 Edition of the Australasian Code for reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr. Olsen consents to the inclusion of the data in the form and context in which it appears.
Appendix 2: The following tables are provided to ensure compliance with the JORC Code (2012) requirements for the reporting of Exploration Results for the MCB Project
Section 1: Sampling Techniques and Data
Criteria | JORC Code explanation | Commentary |
---|---|---|
Sampling techniques |
|
|
Drilling techniques |
|
|
Drill sample recovery |
|
|
Logging |
|
|
Sub-sampling techniques and sample preparation |
|
|
Quality of assay data and laboratory tests |
|
|
Verification of sampling and assaying |
|
|
Location of data points |
|
|
Data spacing and distribution |
|
|
Orientation of data in relation to geological structure |
|
|
Sample security |
|
|
Audits or reviews |
|
|
Section 2: Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
Criteria | JORC Code explanation | Commentary |
---|---|---|
Mineral tenement and land tenure status |
|
|
Exploration done by other parties |
|
|
Geology |
|
|
Drill hole Information |
|
|
Data aggregation methods |
|
|
Relationship between mineralisation widths and intercept lengths |
|
|
Diagrams |
|
|
Balanced Reporting |
|
|
Other substantive exploration data |
|
|
Further work |
|
|
REFERENCES
Basilio, Basilio and Partners Law Offices, 2019. Legal due diligence report for Anleck Ltd.
Belon, H. and Yumul, G. P., 2000. Mio-Pliocene magmatism in the Baguio Mining District, Luzon, Philippines: Age clues to its geodynamic setting. C. R. Acad. Sci., 331. Pp. 295-302.
Corbett, G. and Leach, T. 1997. Short coarse manual: Southwest Pacific rim gold-copper systems: Structure, alteration and mineralisation.
Crisostomo, J. N., Calayag, A. M., Sunio, E., and Vicedo, R., 2013. Preliminary Exploration Results of the Kalinga Geothermal Prospect, Luzon, Philippines. GRC Transactions, v. 37 pp255-262
Durkee, E. F., and Pederson, S. L., 1961. Geology of Northern Luzon, Philippines. Bulletin of the American Association of Petroleum Geologist. v. 45, n. 2 pp. 137-168.
Escacio, F. B. G., 2016. An alternative model of the Batong Buhay Deposit. Internal Freeport-McMoRan report.
Hedenquist, J. W. and Lowernstern, J. B. 1994. The role of magmas in the formation of hydrothermal ore depoits. Nature v. 370. pp. 519-527.
Hoschke, T., 2008. Geophysical signatures of copper-gold porphyry and epithermal gold deposits. In Spencer, J. E. and Titley, S. R., eds, Ores and orogenesis: Circum-Pacific, geologic evolution and ore deposits: Arizona Geologica Society Digest 22, pp 85-100.
Mines and Geosciences Bureau (MGB) – Department of Environment and Natural Resources, 2010. Geology of the Philippines, Second Edition. pp 92-106.
Sillitoe, R. H. 2010, Porphyry Copper Systems. Economic Geology, v. 105, pp 2-41.
Subang, L. L., Manipon C. J. C., Briola, O. A., Ascano, C. J. B., Lulu, J. N., Celiz, M. A. D. A., Taningco, J. R. R., 2006. Geology and
Mineralisation of the Porphyry and Epithermal Cu-Au Deposits at Maalinao-Caigutan-Biyog, Batong Buhay, Pasil, Kalinga, Philippines. Proceedings from the 18th Annual Geological Convention.
Taninco, J. R. R. and Madera, A., 2017. Revised report on Mineral Resource Estimation of Batong Buhay Project. Internal Freeport-McMoRan report.